diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/LICENSE | 24 | ||||
| -rw-r--r-- | lib/Makefile | 118 | ||||
| -rw-r--r-- | lib/liblz4.pc | 14 | ||||
| -rw-r--r-- | lib/liblz4.pc.in | 14 | ||||
| l--------- | lib/liblz4.so | 1 | ||||
| l--------- | lib/liblz4.so.1 | 1 | ||||
| -rwxr-xr-x | lib/liblz4.so.1.4.1 | bin | 0 -> 68571 bytes | |||
| -rw-r--r-- | lib/lz4.c | 1365 | ||||
| -rw-r--r-- | lib/lz4.h | 310 | ||||
| -rw-r--r-- | lib/lz4.o | bin | 0 -> 47472 bytes | |||
| -rw-r--r-- | lib/lz4frame.c | 1330 | ||||
| -rw-r--r-- | lib/lz4frame.h | 261 | ||||
| -rw-r--r-- | lib/lz4hc.c | 768 | ||||
| -rw-r--r-- | lib/lz4hc.h | 223 | ||||
| -rw-r--r-- | lib/lz4hc.o | bin | 0 -> 15888 bytes | |||
| -rw-r--r-- | lib/xxhash.c | 928 | ||||
| -rw-r--r-- | lib/xxhash.h | 156 |
17 files changed, 5513 insertions, 0 deletions
diff --git a/lib/LICENSE b/lib/LICENSE new file mode 100644 index 0000000..b566df3 --- /dev/null +++ b/lib/LICENSE @@ -0,0 +1,24 @@ +LZ4 Library +Copyright (c) 2011-2014, Yann Collet +All rights reserved. + +Redistribution and use in source and binary forms, with or without modification, +are permitted provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright notice, this + list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright notice, this + list of conditions and the following disclaimer in the documentation and/or + other materials provided with the distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR +ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file diff --git a/lib/Makefile b/lib/Makefile new file mode 100644 index 0000000..f2d585f --- /dev/null +++ b/lib/Makefile @@ -0,0 +1,118 @@ +# ################################################################ +# LZ4 library - Makefile +# Copyright (C) Yann Collet 2011-2014 +# All rights reserved. +# +# BSD license +# Redistribution and use in source and binary forms, with or without modification, +# are permitted provided that the following conditions are met: +# +# * Redistributions of source code must retain the above copyright notice, this +# list of conditions and the following disclaimer. +# +# * Redistributions in binary form must reproduce the above copyright notice, this +# list of conditions and the following disclaimer in the documentation and/or +# other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR +# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# You can contact the author at : +# - LZ4 source repository : http://code.google.com/p/lz4/ +# - LZ4 source mirror : https://github.com/Cyan4973/lz4 +# - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c +# ################################################################ + +# Version numbers +RELEASE=r125 +LIBVER_MAJOR=`sed -n '/define LZ4_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h` +LIBVER_MINOR=`sed -n '/define LZ4_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h` +LIBVER_PATCH=`sed -n '/define LZ4_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h` +LIBVER=$(LIBVER_MAJOR).$(LIBVER_MINOR).$(LIBVER_PATCH) + +DESTDIR?= +PREFIX ?= /usr +CC := $(CC) +CFLAGS ?= -O3 +CFLAGS += -I. -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes -DLZ4_VERSION=\"$(RELEASE)\" + +LIBDIR?= $(PREFIX)/lib +INCLUDEDIR=$(PREFIX)/include + + +# OS X linker doesn't support -soname, and use different extension +# see : https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryDesignGuidelines.html +ifeq ($(shell uname), Darwin) + SHARED_EXT = dylib + SHARED_EXT_MAJOR = $(LIBVER_MAJOR).$(SHARED_EXT) + SHARED_EXT_VER = $(LIBVER).$(SHARED_EXT) + SONAME_FLAGS = -install_name $(PREFIX)/lib/liblz4.$(SHARED_EXT_MAJOR) -compatibility_version $(LIBVER_MAJOR) -current_version $(LIBVER) +else + SONAME_FLAGS = -Wl,-soname=liblz4.$(SHARED_EXT).$(LIBVER_MAJOR) + SHARED_EXT = so + SHARED_EXT_MAJOR = $(SHARED_EXT).$(LIBVER_MAJOR) + SHARED_EXT_VER = $(SHARED_EXT).$(LIBVER) +endif + +default: liblz4 + @cd $(PRGDIR); $(MAKE) -e + +all: liblz4 + +liblz4: lz4.c lz4hc.c + @echo compiling static library + @$(CC) $(CPPFLAGS) $(CFLAGS) -c $^ + @$(AR) rcs liblz4.a lz4.o lz4hc.o + @echo compiling dynamic library $(LIBVER) + @$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared $^ -fPIC $(SONAME_FLAGS) -o $@.$(SHARED_EXT_VER) + @echo creating versioned links + @ln -sf $@.$(SHARED_EXT_VER) $@.$(SHARED_EXT_MAJOR) + @ln -sf $@.$(SHARED_EXT_VER) $@.$(SHARED_EXT) + +clean: + @rm -f core *.o *.a *.$(SHARED_EXT) *.$(SHARED_EXT).* liblz4.pc + @echo Cleaning library completed + + +#------------------------------------------------------------------------ +#make install is validated only for Linux, OSX, kFreeBSD and Hurd targets +ifneq (,$(filter $(shell uname),Linux Darwin GNU/kFreeBSD GNU)) + +liblz4.pc: liblz4.pc.in Makefile + @echo creating pkgconfig + @sed -e 's|@PREFIX@|$(PREFIX)|' \ + -e 's|@LIBDIR@|$(LIBDIR)|' \ + -e 's|@INCLUDEDIR@|$(INCLUDEDIR)|' \ + -e 's|@VERSION@|$(VERSION)|' \ + $< >$@ + +install: liblz4 liblz4.pc + @install -d -m 755 $(DESTDIR)$(LIBDIR)/pkgconfig/ $(DESTDIR)$(INCLUDEDIR)/ + @install -m 755 liblz4.$(SHARED_EXT_VER) $(DESTDIR)$(LIBDIR)/liblz4.$(SHARED_EXT_VER) + @cp -a liblz4.$(SHARED_EXT_MAJOR) $(DESTDIR)$(LIBDIR) + @cp -a liblz4.$(SHARED_EXT) $(DESTDIR)$(LIBDIR) + @cp -a liblz4.pc $(DESTDIR)$(LIBDIR)/pkgconfig/ + @install -m 644 liblz4.a $(DESTDIR)$(LIBDIR)/liblz4.a + @install -m 644 lz4.h $(DESTDIR)$(INCLUDEDIR)/lz4.h + @install -m 644 lz4hc.h $(DESTDIR)$(INCLUDEDIR)/lz4hc.h + @echo lz4 static and shared library installed + +uninstall: + @rm -f $(DESTDIR)$(LIBDIR)/liblz4.$(SHARED_EXT) + @rm -f $(DESTDIR)$(LIBDIR)/liblz4.$(SHARED_EXT_MAJOR) + @rm -f $(DESTDIR)$(LIBDIR)/pkgconfig/liblz4.pc + @[ -x $(DESTDIR)$(LIBDIR)/liblz4.$(SHARED_EXT_VER) ] && rm -f $(DESTDIR)$(LIBDIR)/liblz4.$(SHARED_EXT_VER) + @[ -f $(DESTDIR)$(LIBDIR)/liblz4.a ] && rm -f $(DESTDIR)$(LIBDIR)/liblz4.a + @[ -f $(DESTDIR)$(INCLUDEDIR)/lz4.h ] && rm -f $(DESTDIR)$(INCLUDEDIR)/lz4.h + @[ -f $(DESTDIR)$(INCLUDEDIR)/lz4hc.h ] && rm -f $(DESTDIR)$(INCLUDEDIR)/lz4hc.h + @echo lz4 libraries successfully uninstalled + +endif diff --git a/lib/liblz4.pc b/lib/liblz4.pc new file mode 100644 index 0000000..39983ba --- /dev/null +++ b/lib/liblz4.pc @@ -0,0 +1,14 @@ +# LZ4 - Fast LZ compression algorithm +# Copyright (C) 2011-2014, Yann Collet. +# BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + +prefix=/usr +libdir=/usr/lib +includedir=/usr/include + +Name: lz4 +Description: fast lossless compression algorithm library +URL: http://code.google.com/p/lz4/ +Version: +Libs: -L/usr/lib -llz4 +Cflags: -I/usr/include diff --git a/lib/liblz4.pc.in b/lib/liblz4.pc.in new file mode 100644 index 0000000..0d05152 --- /dev/null +++ b/lib/liblz4.pc.in @@ -0,0 +1,14 @@ +# LZ4 - Fast LZ compression algorithm +# Copyright (C) 2011-2014, Yann Collet. +# BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + +prefix=@PREFIX@ +libdir=@LIBDIR@ +includedir=@INCLUDEDIR@ + +Name: lz4 +Description: fast lossless compression algorithm library +URL: http://code.google.com/p/lz4/ +Version: @VERSION@ +Libs: -L@LIBDIR@ -llz4 +Cflags: -I@INCLUDEDIR@ diff --git a/lib/liblz4.so b/lib/liblz4.so new file mode 120000 index 0000000..3c57595 --- /dev/null +++ b/lib/liblz4.so @@ -0,0 +1 @@ +liblz4.so.1.4.1
\ No newline at end of file diff --git a/lib/liblz4.so.1 b/lib/liblz4.so.1 new file mode 120000 index 0000000..3c57595 --- /dev/null +++ b/lib/liblz4.so.1 @@ -0,0 +1 @@ +liblz4.so.1.4.1
\ No newline at end of file diff --git a/lib/liblz4.so.1.4.1 b/lib/liblz4.so.1.4.1 Binary files differnew file mode 100755 index 0000000..6ff6fcf --- /dev/null +++ b/lib/liblz4.so.1.4.1 diff --git a/lib/lz4.c b/lib/lz4.c new file mode 100644 index 0000000..fb84955 --- /dev/null +++ b/lib/lz4.c @@ -0,0 +1,1365 @@ +/* + LZ4 - Fast LZ compression algorithm + Copyright (C) 2011-2014, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - LZ4 source repository : http://code.google.com/p/lz4/ + - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + + +/************************************** + Tuning parameters +**************************************/ +/* + * HEAPMODE : + * Select how default compression functions will allocate memory for their hash table, + * in memory stack (0:default, fastest), or in memory heap (1:requires malloc()). + */ +#define HEAPMODE 0 + +/* + * CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS : + * By default, the source code expects the compiler to correctly optimize + * 4-bytes and 8-bytes read on architectures able to handle it efficiently. + * This is not always the case. In some circumstances (ARM notably), + * the compiler will issue cautious code even when target is able to correctly handle unaligned memory accesses. + * + * You can force the compiler to use unaligned memory access by uncommenting the line below. + * One of the below scenarios will happen : + * 1 - Your target CPU correctly handle unaligned access, and was not well optimized by compiler (good case). + * You will witness large performance improvements (+50% and up). + * Keep the line uncommented and send a word to upstream (https://groups.google.com/forum/#!forum/lz4c) + * The goal is to automatically detect such situations by adding your target CPU within an exception list. + * 2 - Your target CPU correctly handle unaligned access, and was already already optimized by compiler + * No change will be experienced. + * 3 - Your target CPU inefficiently handle unaligned access. + * You will experience a performance loss. Comment back the line. + * 4 - Your target CPU does not handle unaligned access. + * Program will crash. + * If uncommenting results in better performance (case 1) + * please report your configuration to upstream (https://groups.google.com/forum/#!forum/lz4c) + * An automatic detection macro will be added to match your case within future versions of the library. + */ +/* #define CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS 1 */ + + +/************************************** + CPU Feature Detection +**************************************/ +/* + * Automated efficient unaligned memory access detection + * Based on known hardware architectures + * This list will be updated thanks to feedbacks + */ +#if defined(CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS) \ + || defined(__ARM_FEATURE_UNALIGNED) \ + || defined(__i386__) || defined(__x86_64__) \ + || defined(_M_IX86) || defined(_M_X64) \ + || defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) \ + || (defined(_M_ARM) && (_M_ARM >= 7)) +# define LZ4_UNALIGNED_ACCESS 1 +#else +# define LZ4_UNALIGNED_ACCESS 0 +#endif + +/* + * LZ4_FORCE_SW_BITCOUNT + * Define this parameter if your target system or compiler does not support hardware bit count + */ +#if defined(_MSC_VER) && defined(_WIN32_WCE) /* Visual Studio for Windows CE does not support Hardware bit count */ +# define LZ4_FORCE_SW_BITCOUNT +#endif + + +/************************************** + Compiler Options +**************************************/ +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ +/* "restrict" is a known keyword */ +#else +# define restrict /* Disable restrict */ +#endif + +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include <intrin.h> +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) + +#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) +# define expect(expr,value) (__builtin_expect ((expr),(value)) ) +#else +# define expect(expr,value) (expr) +#endif + +#define likely(expr) expect((expr) != 0, 1) +#define unlikely(expr) expect((expr) != 0, 0) + + +/************************************** + Memory routines +**************************************/ +#include <stdlib.h> /* malloc, calloc, free */ +#define ALLOCATOR(n,s) calloc(n,s) +#define FREEMEM free +#include <string.h> /* memset, memcpy */ +#define MEM_INIT memset + + +/************************************** + Includes +**************************************/ +#include "lz4.h" + + +/************************************** + Basic Types +**************************************/ +#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ +# include <stdint.h> + typedef uint8_t BYTE; + typedef uint16_t U16; + typedef uint32_t U32; + typedef int32_t S32; + typedef uint64_t U64; +#else + typedef unsigned char BYTE; + typedef unsigned short U16; + typedef unsigned int U32; + typedef signed int S32; + typedef unsigned long long U64; +#endif + + +/************************************** + Reading and writing into memory +**************************************/ +#define STEPSIZE sizeof(size_t) + +static unsigned LZ4_64bits(void) { return sizeof(void*)==8; } + +static unsigned LZ4_isLittleEndian(void) +{ + const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + return one.c[0]; +} + + +static U16 LZ4_readLE16(const void* memPtr) +{ + if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian())) + return *(U16*)memPtr; + else + { + const BYTE* p = memPtr; + return (U16)((U16)p[0] + (p[1]<<8)); + } +} + +static void LZ4_writeLE16(void* memPtr, U16 value) +{ + if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian())) + { + *(U16*)memPtr = value; + return; + } + else + { + BYTE* p = memPtr; + p[0] = (BYTE) value; + p[1] = (BYTE)(value>>8); + } +} + + +static U16 LZ4_read16(const void* memPtr) +{ + if (LZ4_UNALIGNED_ACCESS) + return *(U16*)memPtr; + else + { + U16 val16; + memcpy(&val16, memPtr, 2); + return val16; + } +} + +static U32 LZ4_read32(const void* memPtr) +{ + if (LZ4_UNALIGNED_ACCESS) + return *(U32*)memPtr; + else + { + U32 val32; + memcpy(&val32, memPtr, 4); + return val32; + } +} + +static U64 LZ4_read64(const void* memPtr) +{ + if (LZ4_UNALIGNED_ACCESS) + return *(U64*)memPtr; + else + { + U64 val64; + memcpy(&val64, memPtr, 8); + return val64; + } +} + +static size_t LZ4_read_ARCH(const void* p) +{ + if (LZ4_64bits()) + return (size_t)LZ4_read64(p); + else + return (size_t)LZ4_read32(p); +} + + +static void LZ4_copy4(void* dstPtr, const void* srcPtr) +{ + if (LZ4_UNALIGNED_ACCESS) + { + *(U32*)dstPtr = *(U32*)srcPtr; + return; + } + memcpy(dstPtr, srcPtr, 4); +} + +static void LZ4_copy8(void* dstPtr, const void* srcPtr) +{ + if (LZ4_UNALIGNED_ACCESS) + { + if (LZ4_64bits()) + *(U64*)dstPtr = *(U64*)srcPtr; + else + ((U32*)dstPtr)[0] = ((U32*)srcPtr)[0], + ((U32*)dstPtr)[1] = ((U32*)srcPtr)[1]; + return; + } + memcpy(dstPtr, srcPtr, 8); +} + +/* customized version of memcpy, which may overwrite up to 7 bytes beyond dstEnd */ +static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd) +{ + BYTE* d = dstPtr; + const BYTE* s = srcPtr; + BYTE* e = dstEnd; + do { LZ4_copy8(d,s); d+=8; s+=8; } while (d<e); +} + + +/************************************** + Common Constants +**************************************/ +#define MINMATCH 4 + +#define COPYLENGTH 8 +#define LASTLITERALS 5 +#define MFLIMIT (COPYLENGTH+MINMATCH) +static const int LZ4_minLength = (MFLIMIT+1); + +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define MAXD_LOG 16 +#define MAX_DISTANCE ((1 << MAXD_LOG) - 1) + +#define ML_BITS 4 +#define ML_MASK ((1U<<ML_BITS)-1) +#define RUN_BITS (8-ML_BITS) +#define RUN_MASK ((1U<<RUN_BITS)-1) + + +/************************************** + Common Utils +**************************************/ +#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/******************************** + Common functions +********************************/ +static unsigned LZ4_NbCommonBytes (register size_t val) +{ + if (LZ4_isLittleEndian()) + { + if (LZ4_64bits()) + { +# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanForward64( &r, (U64)val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_ctzll((U64)val) >> 3); +# else + static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 }; + return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58]; +# endif + } + else /* 32 bits */ + { +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r; + _BitScanForward( &r, (U32)val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_ctz((U32)val) >> 3); +# else + static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 }; + return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27]; +# endif + } + } + else /* Big Endian CPU */ + { + if (LZ4_64bits()) + { +# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanReverse64( &r, val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_clzll(val) >> 3); +# else + unsigned r; + if (!(val>>32)) { r=4; } else { r=0; val>>=32; } + if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } + r += (!val); + return r; +# endif + } + else /* 32 bits */ + { +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanReverse( &r, (unsigned long)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_clz(val) >> 3); +# else + unsigned r; + if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } + r += (!val); + return r; +# endif + } + } +} + +static unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit) +{ + const BYTE* const pStart = pIn; + + while (likely(pIn<pInLimit-(STEPSIZE-1))) + { + size_t diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn); + if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; } + pIn += LZ4_NbCommonBytes(diff); + return (unsigned)(pIn - pStart); + } + if (LZ4_64bits()) if ((pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; } + if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; } + if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++; + + return (unsigned)(pIn - pStart); +} + + +#ifndef LZ4_COMMONDEFS_ONLY +/************************************** + Local Common Constants +**************************************/ +#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2) +#define HASHTABLESIZE (1 << LZ4_MEMORY_USAGE) +#define HASH_SIZE_U32 (1 << LZ4_HASHLOG) + +#define LZ4_64KLIMIT ((64 KB) + (MFLIMIT-1)) +#define SKIPSTRENGTH 6 /* Increasing this value will make the compression run slower on incompressible data */ + +#define MAXD_LOG 16 +#define MAX_DISTANCE ((1 << MAXD_LOG) - 1) + + +/************************************** + Local Utils +**************************************/ +int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; } +int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); } + + +/************************************** + Local Structures and types +**************************************/ +typedef struct { + U32 hashTable[HASH_SIZE_U32]; + U32 currentOffset; + U32 initCheck; + const BYTE* dictionary; + const BYTE* bufferStart; + U32 dictSize; +} LZ4_stream_t_internal; + +typedef enum { notLimited = 0, limitedOutput = 1 } limitedOutput_directive; +typedef enum { byPtr, byU32, byU16 } tableType_t; + +typedef enum { noDict = 0, withPrefix64k, usingExtDict } dict_directive; +typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive; + +typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive; +typedef enum { full = 0, partial = 1 } earlyEnd_directive; + + + +/******************************** + Compression functions +********************************/ + +static U32 LZ4_hashSequence(U32 sequence, tableType_t tableType) +{ + if (tableType == byU16) + return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1))); + else + return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG)); +} + +static U32 LZ4_hashPosition(const BYTE* p, tableType_t tableType) { return LZ4_hashSequence(LZ4_read32(p), tableType); } + +static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + switch (tableType) + { + case byPtr: { const BYTE** hashTable = (const BYTE**) tableBase; hashTable[h] = p; return; } + case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); return; } + case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); return; } + } +} + +static void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + U32 h = LZ4_hashPosition(p, tableType); + LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase); +} + +static const BYTE* LZ4_getPositionOnHash(U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + if (tableType == byPtr) { const BYTE** hashTable = (const BYTE**) tableBase; return hashTable[h]; } + if (tableType == byU32) { U32* hashTable = (U32*) tableBase; return hashTable[h] + srcBase; } + { U16* hashTable = (U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */ +} + +static const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + U32 h = LZ4_hashPosition(p, tableType); + return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase); +} + +static int LZ4_compress_generic( + void* ctx, + const char* source, + char* dest, + int inputSize, + int maxOutputSize, + limitedOutput_directive outputLimited, + tableType_t tableType, + dict_directive dict, + dictIssue_directive dictIssue) +{ + LZ4_stream_t_internal* const dictPtr = (LZ4_stream_t_internal*)ctx; + + const BYTE* ip = (const BYTE*) source; + const BYTE* base; + const BYTE* lowLimit; + const BYTE* const lowRefLimit = ip - dictPtr->dictSize; + const BYTE* const dictionary = dictPtr->dictionary; + const BYTE* const dictEnd = dictionary + dictPtr->dictSize; + const size_t dictDelta = dictEnd - (const BYTE*)source; + const BYTE* anchor = (const BYTE*) source; + const BYTE* const iend = ip + inputSize; + const BYTE* const mflimit = iend - MFLIMIT; + const BYTE* const matchlimit = iend - LASTLITERALS; + + BYTE* op = (BYTE*) dest; + BYTE* const olimit = op + maxOutputSize; + + const int skipStrength = SKIPSTRENGTH; + U32 forwardH; + size_t refDelta=0; + + /* Init conditions */ + if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */ + switch(dict) + { + case noDict: + default: + base = (const BYTE*)source; + lowLimit = (const BYTE*)source; + break; + case withPrefix64k: + base = (const BYTE*)source - dictPtr->currentOffset; + lowLimit = (const BYTE*)source - dictPtr->dictSize; + break; + case usingExtDict: + base = (const BYTE*)source - dictPtr->currentOffset; + lowLimit = (const BYTE*)source; + break; + } + if ((tableType == byU16) && (inputSize>=(int)LZ4_64KLIMIT)) return 0; /* Size too large (not within 64K limit) */ + if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */ + + /* First Byte */ + LZ4_putPosition(ip, ctx, tableType, base); + ip++; forwardH = LZ4_hashPosition(ip, tableType); + + /* Main Loop */ + for ( ; ; ) + { + const BYTE* ref; + BYTE* token; + { + const BYTE* forwardIp = ip; + unsigned step=1; + unsigned searchMatchNb = (1U << skipStrength); + + /* Find a match */ + do { + U32 h = forwardH; + ip = forwardIp; + forwardIp += step; + step = searchMatchNb++ >> skipStrength; + + if (unlikely(forwardIp > mflimit)) goto _last_literals; + + ref = LZ4_getPositionOnHash(h, ctx, tableType, base); + if (dict==usingExtDict) + { + if (ref<(const BYTE*)source) + { + refDelta = dictDelta; + lowLimit = dictionary; + } + else + { + refDelta = 0; + lowLimit = (const BYTE*)source; + } + } + forwardH = LZ4_hashPosition(forwardIp, tableType); + LZ4_putPositionOnHash(ip, h, ctx, tableType, base); + + } while ( ((dictIssue==dictSmall) ? (ref < lowRefLimit) : 0) + || ((tableType==byU16) ? 0 : (ref + MAX_DISTANCE < ip)) + || (LZ4_read32(ref+refDelta) != LZ4_read32(ip)) ); + } + + /* Catch up */ + while ((ip>anchor) && (ref+refDelta > lowLimit) && (unlikely(ip[-1]==ref[refDelta-1]))) { ip--; ref--; } + + { + /* Encode Literal length */ + unsigned litLength = (unsigned)(ip - anchor); + token = op++; + if ((outputLimited) && (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit))) + return 0; /* Check output limit */ + if (litLength>=RUN_MASK) + { + int len = (int)litLength-RUN_MASK; + *token=(RUN_MASK<<ML_BITS); + for(; len >= 255 ; len-=255) *op++ = 255; + *op++ = (BYTE)len; + } + else *token = (BYTE)(litLength<<ML_BITS); + + /* Copy Literals */ + LZ4_wildCopy(op, anchor, op+litLength); + op+=litLength; + } + +_next_match: + /* Encode Offset */ + LZ4_writeLE16(op, (U16)(ip-ref)); op+=2; + + /* Encode MatchLength */ + { + unsigned matchLength; + + if ((dict==usingExtDict) && (lowLimit==dictionary)) + { + const BYTE* limit; + ref += refDelta; + limit = ip + (dictEnd-ref); + if (limit > matchlimit) limit = matchlimit; + matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, limit); + ip += MINMATCH + matchLength; + if (ip==limit) + { + unsigned more = LZ4_count(ip, (const BYTE*)source, matchlimit); + matchLength += more; + ip += more; + } + } + else + { + matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, matchlimit); + ip += MINMATCH + matchLength; + } + + if (matchLength>=ML_MASK) + { + if ((outputLimited) && (unlikely(op + (1 + LASTLITERALS) + (matchLength>>8) > olimit))) + return 0; /* Check output limit */ + *token += ML_MASK; + matchLength -= ML_MASK; + for (; matchLength >= 510 ; matchLength-=510) { *op++ = 255; *op++ = 255; } + if (matchLength >= 255) { matchLength-=255; *op++ = 255; } + *op++ = (BYTE)matchLength; + } + else *token += (BYTE)(matchLength); + } + + anchor = ip; + + /* Test end of chunk */ + if (ip > mflimit) break; + + /* Fill table */ + LZ4_putPosition(ip-2, ctx, tableType, base); + + /* Test next position */ + ref = LZ4_getPosition(ip, ctx, tableType, base); + if (dict==usingExtDict) + { + if (ref<(const BYTE*)source) + { + refDelta = dictDelta; + lowLimit = dictionary; + } + else + { + refDelta = 0; + lowLimit = (const BYTE*)source; + } + } + LZ4_putPosition(ip, ctx, tableType, base); + if ( ((dictIssue==dictSmall) ? (ref>=lowRefLimit) : 1) + && (ref+MAX_DISTANCE>=ip) + && (LZ4_read32(ref+refDelta)==LZ4_read32(ip)) ) + { token=op++; *token=0; goto _next_match; } + + /* Prepare next loop */ + forwardH = LZ4_hashPosition(++ip, tableType); + } + +_last_literals: + /* Encode Last Literals */ + { + int lastRun = (int)(iend - anchor); + if ((outputLimited) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) + return 0; /* Check output limit */ + if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun >= 255 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; } + else *op++ = (BYTE)(lastRun<<ML_BITS); + memcpy(op, anchor, iend - anchor); + op += iend-anchor; + } + + /* End */ + return (int) (((char*)op)-dest); +} + + +int LZ4_compress(const char* source, char* dest, int inputSize) +{ +#if (HEAPMODE) + void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U64, 8); /* Aligned on 8-bytes boundaries */ +#else + U64 ctx[LZ4_STREAMSIZE_U64] = {0}; /* Ensure data is aligned on 8-bytes boundaries */ +#endif + int result; + + if (inputSize < (int)LZ4_64KLIMIT) + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue); + else + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue); + +#if (HEAPMODE) + FREEMEM(ctx); +#endif + return result; +} + +int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize) +{ +#if (HEAPMODE) + void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U64, 8); /* Aligned on 8-bytes boundaries */ +#else + U64 ctx[LZ4_STREAMSIZE_U64] = {0}; /* Ensure data is aligned on 8-bytes boundaries */ +#endif + int result; + + if (inputSize < (int)LZ4_64KLIMIT) + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue); + else + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue); + +#if (HEAPMODE) + FREEMEM(ctx); +#endif + return result; +} + + +/***************************************** + Experimental : Streaming functions +*****************************************/ + +/* + * LZ4_initStream + * Use this function once, to init a newly allocated LZ4_stream_t structure + * Return : 1 if OK, 0 if error + */ +void LZ4_resetStream (LZ4_stream_t* LZ4_stream) +{ + MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t)); +} + +LZ4_stream_t* LZ4_createStream(void) +{ + LZ4_stream_t* lz4s = (LZ4_stream_t*)ALLOCATOR(8, LZ4_STREAMSIZE_U64); + LZ4_STATIC_ASSERT(LZ4_STREAMSIZE >= sizeof(LZ4_stream_t_internal)); /* A compilation error here means LZ4_STREAMSIZE is not large enough */ + LZ4_resetStream(lz4s); + return lz4s; +} + +int LZ4_freeStream (LZ4_stream_t* LZ4_stream) +{ + FREEMEM(LZ4_stream); + return (0); +} + + +int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) +{ + LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; + const BYTE* p = (const BYTE*)dictionary; + const BYTE* const dictEnd = p + dictSize; + const BYTE* base; + + if (dict->initCheck) LZ4_resetStream(LZ4_dict); /* Uninitialized structure detected */ + + if (dictSize < MINMATCH) + { + dict->dictionary = NULL; + dict->dictSize = 0; + return 0; + } + + if (p <= dictEnd - 64 KB) p = dictEnd - 64 KB; + base = p - dict->currentOffset; + dict->dictionary = p; + dict->dictSize = (U32)(dictEnd - p); + dict->currentOffset += dict->dictSize; + + while (p <= dictEnd-MINMATCH) + { + LZ4_putPosition(p, dict, byU32, base); + p+=3; + } + + return dict->dictSize; +} + + +static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src) +{ + if ((LZ4_dict->currentOffset > 0x80000000) || + ((size_t)LZ4_dict->currentOffset > (size_t)src)) /* address space overflow */ + { + /* rescale hash table */ + U32 delta = LZ4_dict->currentOffset - 64 KB; + const BYTE* dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize; + int i; + for (i=0; i<HASH_SIZE_U32; i++) + { + if (LZ4_dict->hashTable[i] < delta) LZ4_dict->hashTable[i]=0; + else LZ4_dict->hashTable[i] -= delta; + } + LZ4_dict->currentOffset = 64 KB; + if (LZ4_dict->dictSize > 64 KB) LZ4_dict->dictSize = 64 KB; + LZ4_dict->dictionary = dictEnd - LZ4_dict->dictSize; + } +} + + +FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* source, char* dest, int inputSize, + int maxOutputSize, limitedOutput_directive limit) +{ + LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_stream; + const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; + + const BYTE* smallest = (const BYTE*) source; + if (streamPtr->initCheck) return 0; /* Uninitialized structure detected */ + if ((streamPtr->dictSize>0) && (smallest>dictEnd)) smallest = dictEnd; + LZ4_renormDictT(streamPtr, smallest); + + /* Check overlapping input/dictionary space */ + { + const BYTE* sourceEnd = (const BYTE*) source + inputSize; + if ((sourceEnd > streamPtr->dictionary) && (sourceEnd < dictEnd)) + { + streamPtr->dictSize = (U32)(dictEnd - sourceEnd); + if (streamPtr->dictSize > 64 KB) streamPtr->dictSize = 64 KB; + if (streamPtr->dictSize < 4) streamPtr->dictSize = 0; + streamPtr->dictionary = dictEnd - streamPtr->dictSize; + } + } + + /* prefix mode : source data follows dictionary */ + if (dictEnd == (const BYTE*)source) + { + int result; + if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset)) + result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, dictSmall); + else + result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, noDictIssue); + streamPtr->dictSize += (U32)inputSize; + streamPtr->currentOffset += (U32)inputSize; + return result; + } + + /* external dictionary mode */ + { + int result; + if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset)) + result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, dictSmall); + else + result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, noDictIssue); + streamPtr->dictionary = (const BYTE*)source; + streamPtr->dictSize = (U32)inputSize; + streamPtr->currentOffset += (U32)inputSize; + return result; + } +} + +int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize) +{ + return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, 0, notLimited); +} + +int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput); +} + + +/* Hidden debug function, to force separate dictionary mode */ +int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int inputSize) +{ + LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_dict; + int result; + const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; + + const BYTE* smallest = dictEnd; + if (smallest > (const BYTE*) source) smallest = (const BYTE*) source; + LZ4_renormDictT((LZ4_stream_t_internal*)LZ4_dict, smallest); + + result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue); + + streamPtr->dictionary = (const BYTE*)source; + streamPtr->dictSize = (U32)inputSize; + streamPtr->currentOffset += (U32)inputSize; + + return result; +} + + +int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize) +{ + LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; + const BYTE* previousDictEnd = dict->dictionary + dict->dictSize; + + if ((U32)dictSize > 64 KB) dictSize = 64 KB; /* useless to define a dictionary > 64 KB */ + if ((U32)dictSize > dict->dictSize) dictSize = dict->dictSize; + + memmove(safeBuffer, previousDictEnd - dictSize, dictSize); + + dict->dictionary = (const BYTE*)safeBuffer; + dict->dictSize = (U32)dictSize; + + return dictSize; +} + + + +/**************************** + Decompression functions +****************************/ +/* + * This generic decompression function cover all use cases. + * It shall be instantiated several times, using different sets of directives + * Note that it is essential this generic function is really inlined, + * in order to remove useless branches during compilation optimization. + */ +FORCE_INLINE int LZ4_decompress_generic( + const char* const source, + char* const dest, + int inputSize, + int outputSize, /* If endOnInput==endOnInputSize, this value is the max size of Output Buffer. */ + + int endOnInput, /* endOnOutputSize, endOnInputSize */ + int partialDecoding, /* full, partial */ + int targetOutputSize, /* only used if partialDecoding==partial */ + int dict, /* noDict, withPrefix64k, usingExtDict */ + const BYTE* const lowPrefix, /* == dest if dict == noDict */ + const BYTE* const dictStart, /* only if dict==usingExtDict */ + const size_t dictSize /* note : = 0 if noDict */ + ) +{ + /* Local Variables */ + const BYTE* restrict ip = (const BYTE*) source; + const BYTE* const iend = ip + inputSize; + + BYTE* op = (BYTE*) dest; + BYTE* const oend = op + outputSize; + BYTE* cpy; + BYTE* oexit = op + targetOutputSize; + const BYTE* const lowLimit = lowPrefix - dictSize; + + const BYTE* const dictEnd = (const BYTE*)dictStart + dictSize; + const size_t dec32table[] = {4, 1, 2, 1, 4, 4, 4, 4}; + const size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3}; + + const int safeDecode = (endOnInput==endOnInputSize); + const int checkOffset = ((safeDecode) && (dictSize < (int)(64 KB))); + + + /* Special cases */ + if ((partialDecoding) && (oexit> oend-MFLIMIT)) oexit = oend-MFLIMIT; /* targetOutputSize too high => decode everything */ + if ((endOnInput) && (unlikely(outputSize==0))) return ((inputSize==1) && (*ip==0)) ? 0 : -1; /* Empty output buffer */ + if ((!endOnInput) && (unlikely(outputSize==0))) return (*ip==0?1:-1); + + + /* Main Loop */ + while (1) + { + unsigned token; + size_t length; + const BYTE* match; + + /* get literal length */ + token = *ip++; + if ((length=(token>>ML_BITS)) == RUN_MASK) + { + unsigned s; + do + { + s = *ip++; + length += s; + } + while (likely((endOnInput)?ip<iend-RUN_MASK:1) && (s==255)); + if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)(op))) goto _output_error; /* overflow detection */ + if ((safeDecode) && unlikely((size_t)(ip+length)<(size_t)(ip))) goto _output_error; /* overflow detection */ + } + + /* copy literals */ + cpy = op+length; + if (((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) ) + || ((!endOnInput) && (cpy>oend-COPYLENGTH))) + { + if (partialDecoding) + { + if (cpy > oend) goto _output_error; /* Error : write attempt beyond end of output buffer */ + if ((endOnInput) && (ip+length > iend)) goto _output_error; /* Error : read attempt beyond end of input buffer */ + } + else + { + if ((!endOnInput) && (cpy != oend)) goto _output_error; /* Error : block decoding must stop exactly there */ + if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) goto _output_error; /* Error : input must be consumed */ + } + memcpy(op, ip, length); + ip += length; + op += length; + break; /* Necessarily EOF, due to parsing restrictions */ + } + LZ4_wildCopy(op, ip, cpy); + ip += length; op = cpy; + + /* get offset */ + match = cpy - LZ4_readLE16(ip); ip+=2; + if ((checkOffset) && (unlikely(match < lowLimit))) goto _output_error; /* Error : offset outside destination buffer */ + + /* get matchlength */ + length = token & ML_MASK; + if (length == ML_MASK) + { + unsigned s; + do + { + if ((endOnInput) && (ip > iend-LASTLITERALS)) goto _output_error; + s = *ip++; + length += s; + } while (s==255); + if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)op)) goto _output_error; /* overflow detection */ + } + length += MINMATCH; + + /* check external dictionary */ + if ((dict==usingExtDict) && (match < lowPrefix)) + { + if (unlikely(op+length > oend-LASTLITERALS)) goto _output_error; /* doesn't respect parsing restriction */ + + if (length <= (size_t)(lowPrefix-match)) + { + /* match can be copied as a single segment from external dictionary */ + match = dictEnd - (lowPrefix-match); + memcpy(op, match, length); + op += length; + } + else + { + /* match encompass external dictionary and current segment */ + size_t copySize = (size_t)(lowPrefix-match); + memcpy(op, dictEnd - copySize, copySize); + op += copySize; + copySize = length - copySize; + if (copySize > (size_t)(op-lowPrefix)) /* overlap within current segment */ + { + BYTE* const endOfMatch = op + copySize; + const BYTE* copyFrom = lowPrefix; + while (op < endOfMatch) *op++ = *copyFrom++; + } + else + { + memcpy(op, lowPrefix, copySize); + op += copySize; + } + } + continue; + } + + /* copy repeated sequence */ + cpy = op + length; + if (unlikely((op-match)<8)) + { + const size_t dec64 = dec64table[op-match]; + op[0] = match[0]; + op[1] = match[1]; + op[2] = match[2]; + op[3] = match[3]; + match += dec32table[op-match]; + LZ4_copy4(op+4, match); + op += 8; match -= dec64; + } else { LZ4_copy8(op, match); op+=8; match+=8; } + + if (unlikely(cpy>oend-12)) + { + if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last LASTLITERALS bytes must be literals */ + if (op < oend-8) + { + LZ4_wildCopy(op, match, oend-8); + match += (oend-8) - op; + op = oend-8; + } + while (op<cpy) *op++ = *match++; + } + else + LZ4_wildCopy(op, match, cpy); + op=cpy; /* correction */ + } + + /* end of decoding */ + if (endOnInput) + return (int) (((char*)op)-dest); /* Nb of output bytes decoded */ + else + return (int) (((char*)ip)-source); /* Nb of input bytes read */ + + /* Overflow error detected */ +_output_error: + return (int) (-(((char*)ip)-source))-1; +} + + +int LZ4_decompress_safe(const char* source, char* dest, int compressedSize, int maxDecompressedSize) +{ + return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, full, 0, noDict, (BYTE*)dest, NULL, 0); +} + +int LZ4_decompress_safe_partial(const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize) +{ + return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, partial, targetOutputSize, noDict, (BYTE*)dest, NULL, 0); +} + +int LZ4_decompress_fast(const char* source, char* dest, int originalSize) +{ + return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)(dest - 64 KB), NULL, 64 KB); +} + + +/* streaming decompression functions */ + +typedef struct +{ + BYTE* externalDict; + size_t extDictSize; + BYTE* prefixEnd; + size_t prefixSize; +} LZ4_streamDecode_t_internal; + +/* + * If you prefer dynamic allocation methods, + * LZ4_createStreamDecode() + * provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure. + */ +LZ4_streamDecode_t* LZ4_createStreamDecode(void) +{ + LZ4_streamDecode_t* lz4s = (LZ4_streamDecode_t*) ALLOCATOR(sizeof(U64), LZ4_STREAMDECODESIZE_U64); + return lz4s; +} + +int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream) +{ + FREEMEM(LZ4_stream); + return 0; +} + +/* + * LZ4_setStreamDecode + * Use this function to instruct where to find the dictionary + * This function is not necessary if previous data is still available where it was decoded. + * Loading a size of 0 is allowed (same effect as no dictionary). + * Return : 1 if OK, 0 if error + */ +int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize) +{ + LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + lz4sd->prefixSize = (size_t) dictSize; + lz4sd->prefixEnd = (BYTE*) dictionary + dictSize; + lz4sd->externalDict = NULL; + lz4sd->extDictSize = 0; + return 1; +} + +/* +*_continue() : + These decoding functions allow decompression of multiple blocks in "streaming" mode. + Previously decoded blocks must still be available at the memory position where they were decoded. + If it's not possible, save the relevant part of decoded data into a safe buffer, + and indicate where it stands using LZ4_setStreamDecode() +*/ +int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize) +{ + LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + int result; + + if (lz4sd->prefixEnd == (BYTE*)dest) + { + result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, + endOnInputSize, full, 0, + usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); + if (result <= 0) return result; + lz4sd->prefixSize += result; + lz4sd->prefixEnd += result; + } + else + { + lz4sd->extDictSize = lz4sd->prefixSize; + lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; + result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, + endOnInputSize, full, 0, + usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize); + if (result <= 0) return result; + lz4sd->prefixSize = result; + lz4sd->prefixEnd = (BYTE*)dest + result; + } + + return result; +} + +int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize) +{ + LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + int result; + + if (lz4sd->prefixEnd == (BYTE*)dest) + { + result = LZ4_decompress_generic(source, dest, 0, originalSize, + endOnOutputSize, full, 0, + usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); + if (result <= 0) return result; + lz4sd->prefixSize += originalSize; + lz4sd->prefixEnd += originalSize; + } + else + { + lz4sd->extDictSize = lz4sd->prefixSize; + lz4sd->externalDict = (BYTE*)dest - lz4sd->extDictSize; + result = LZ4_decompress_generic(source, dest, 0, originalSize, + endOnOutputSize, full, 0, + usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize); + if (result <= 0) return result; + lz4sd->prefixSize = originalSize; + lz4sd->prefixEnd = (BYTE*)dest + originalSize; + } + + return result; +} + + +/* +Advanced decoding functions : +*_usingDict() : + These decoding functions work the same as "_continue" ones, + the dictionary must be explicitly provided within parameters +*/ + +FORCE_INLINE int LZ4_decompress_usingDict_generic(const char* source, char* dest, int compressedSize, int maxOutputSize, int safe, const char* dictStart, int dictSize) +{ + if (dictSize==0) + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest, NULL, 0); + if (dictStart+dictSize == dest) + { + if (dictSize >= (int)(64 KB - 1)) + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, withPrefix64k, (BYTE*)dest-64 KB, NULL, 0); + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest-dictSize, NULL, 0); + } + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, usingExtDict, (BYTE*)dest, (BYTE*)dictStart, dictSize); +} + +int LZ4_decompress_safe_usingDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize) +{ + return LZ4_decompress_usingDict_generic(source, dest, compressedSize, maxOutputSize, 1, dictStart, dictSize); +} + +int LZ4_decompress_fast_usingDict(const char* source, char* dest, int originalSize, const char* dictStart, int dictSize) +{ + return LZ4_decompress_usingDict_generic(source, dest, 0, originalSize, 0, dictStart, dictSize); +} + +/* debug function */ +int LZ4_decompress_safe_forceExtDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize) +{ + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, (BYTE*)dest, (BYTE*)dictStart, dictSize); +} + + +/*************************************************** + Obsolete Functions +***************************************************/ +/* +These function names are deprecated and should no longer be used. +They are only provided here for compatibility with older user programs. +- LZ4_uncompress is totally equivalent to LZ4_decompress_fast +- LZ4_uncompress_unknownOutputSize is totally equivalent to LZ4_decompress_safe +*/ +int LZ4_uncompress (const char* source, char* dest, int outputSize) { return LZ4_decompress_fast(source, dest, outputSize); } +int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize) { return LZ4_decompress_safe(source, dest, isize, maxOutputSize); } + + +/* Obsolete Streaming functions */ + +int LZ4_sizeofStreamState() { return LZ4_STREAMSIZE; } + +static void LZ4_init(LZ4_stream_t_internal* lz4ds, const BYTE* base) +{ + MEM_INIT(lz4ds, 0, LZ4_STREAMSIZE); + lz4ds->bufferStart = base; +} + +int LZ4_resetStreamState(void* state, const char* inputBuffer) +{ + if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */ + LZ4_init((LZ4_stream_t_internal*)state, (const BYTE*)inputBuffer); + return 0; +} + +void* LZ4_create (const char* inputBuffer) +{ + void* lz4ds = ALLOCATOR(8, LZ4_STREAMSIZE_U64); + LZ4_init ((LZ4_stream_t_internal*)lz4ds, (const BYTE*)inputBuffer); + return lz4ds; +} + +char* LZ4_slideInputBuffer (void* LZ4_Data) +{ + LZ4_stream_t_internal* lz4ds = (LZ4_stream_t_internal*)LZ4_Data; + + LZ4_saveDict((LZ4_stream_t*)LZ4_Data, (char*)lz4ds->bufferStart, 64 KB); + + return (char*)(lz4ds->bufferStart + 64 KB); +} + +/* Obsolete compresson functions using User-allocated state */ + +int LZ4_sizeofState() { return LZ4_STREAMSIZE; } + +int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize) +{ + if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */ + MEM_INIT(state, 0, LZ4_STREAMSIZE); + + if (inputSize < (int)LZ4_64KLIMIT) + return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue); + else + return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue); +} + +int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize) +{ + if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */ + MEM_INIT(state, 0, LZ4_STREAMSIZE); + + if (inputSize < (int)LZ4_64KLIMIT) + return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue); + else + return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue); +} + +/* Obsolete streaming decompression functions */ + +int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int compressedSize, int maxOutputSize) +{ + return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB); +} + +int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int originalSize) +{ + return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB); +} + +#endif /* LZ4_COMMONDEFS_ONLY */ + diff --git a/lib/lz4.h b/lib/lz4.h new file mode 100644 index 0000000..22bbcb5 --- /dev/null +++ b/lib/lz4.h @@ -0,0 +1,310 @@ +/* + LZ4 - Fast LZ compression algorithm + Header File + Copyright (C) 2011-2014, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - LZ4 source repository : http://code.google.com/p/lz4/ + - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ +#pragma once + +#if defined (__cplusplus) +extern "C" { +#endif + +/* + * lz4.h provides raw compression format functions, for optimal performance and integration into programs. + * If you need to generate data using an inter-operable format (respecting the framing specification), + * please use lz4frame.h instead. +*/ + +/************************************** + Version +**************************************/ +#define LZ4_VERSION_MAJOR 1 /* for major interface/format changes */ +#define LZ4_VERSION_MINOR 4 /* for minor interface/format changes */ +#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */ +#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE) +int LZ4_versionNumber (void); + +/************************************** + Tuning parameter +**************************************/ +/* + * LZ4_MEMORY_USAGE : + * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) + * Increasing memory usage improves compression ratio + * Reduced memory usage can improve speed, due to cache effect + * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache + */ +#define LZ4_MEMORY_USAGE 14 + + +/************************************** + Simple Functions +**************************************/ + +int LZ4_compress (const char* source, char* dest, int sourceSize); +int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize); + +/* +LZ4_compress() : + Compresses 'sourceSize' bytes from 'source' into 'dest'. + Destination buffer must be already allocated, + and must be sized to handle worst cases situations (input data not compressible) + Worst case size evaluation is provided by function LZ4_compressBound() + inputSize : Max supported value is LZ4_MAX_INPUT_SIZE + return : the number of bytes written in buffer dest + or 0 if the compression fails + +LZ4_decompress_safe() : + compressedSize : is obviously the source size + maxDecompressedSize : is the size of the destination buffer, which must be already allocated. + return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize) + If the destination buffer is not large enough, decoding will stop and output an error code (<0). + If the source stream is detected malformed, the function will stop decoding and return a negative result. + This function is protected against buffer overflow exploits, + and never writes outside of output buffer, nor reads outside of input buffer. + It is also protected against malicious data packets. +*/ + + +/************************************** + Advanced Functions +**************************************/ +#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */ +#define LZ4_COMPRESSBOUND(isize) ((unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16) + +/* +LZ4_compressBound() : + Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible) + This function is primarily useful for memory allocation purposes (output buffer size). + Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example). + + isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE + return : maximum output size in a "worst case" scenario + or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE) +*/ +int LZ4_compressBound(int isize); + + +/* +LZ4_compress_limitedOutput() : + Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'. + If it cannot achieve it, compression will stop, and result of the function will be zero. + This saves time and memory on detecting non-compressible (or barely compressible) data. + This function never writes outside of provided output buffer. + + sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE + maxOutputSize : is the size of the destination buffer (which must be already allocated) + return : the number of bytes written in buffer 'dest' + or 0 if compression fails +*/ +int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize); + + +/* +LZ4_compress_withState() : + Same compression functions, but using an externally allocated memory space to store compression state. + Use LZ4_sizeofState() to know how much memory must be allocated, + and then, provide it as 'void* state' to compression functions. +*/ +int LZ4_sizeofState(void); +int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize); +int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize); + + +/* +LZ4_decompress_fast() : + originalSize : is the original and therefore uncompressed size + return : the number of bytes read from the source buffer (in other words, the compressed size) + If the source stream is detected malformed, the function will stop decoding and return a negative result. + Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes. + note : This function fully respect memory boundaries for properly formed compressed data. + It is a bit faster than LZ4_decompress_safe(). + However, it does not provide any protection against intentionally modified data stream (malicious input). + Use this function in trusted environment only (data to decode comes from a trusted source). +*/ +int LZ4_decompress_fast (const char* source, char* dest, int originalSize); + + +/* +LZ4_decompress_safe_partial() : + This function decompress a compressed block of size 'compressedSize' at position 'source' + into destination buffer 'dest' of size 'maxDecompressedSize'. + The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached, + reducing decompression time. + return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize) + Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller. + Always control how many bytes were decoded. + If the source stream is detected malformed, the function will stop decoding and return a negative result. + This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets +*/ +int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize); + + +/*********************************************** + Streaming Compression Functions +***********************************************/ + +#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4) +#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long)) +/* + * LZ4_stream_t + * information structure to track an LZ4 stream. + * important : init this structure content before first use ! + */ +typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t; + +/* + * LZ4_resetStream + * Use this function to init an allocated LZ4_stream_t structure + */ +void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr); + +/* + * If you prefer dynamic allocation methods, + * LZ4_createStream will allocate and initialize an LZ4_stream_t structure + * LZ4_freeStream releases its memory. + */ +LZ4_stream_t* LZ4_createStream(void); +int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr); + +/* + * LZ4_loadDict + * Use this function to load a static dictionary into LZ4_stream. + * Any previous data will be forgotten, only 'dictionary' will remain in memory. + * Loading a size of 0 is allowed. + * Return : dictionary size, in bytes (necessarily <= 64 KB) + */ +int LZ4_loadDict (LZ4_stream_t* LZ4_streamPtr, const char* dictionary, int dictSize); + +/* + * LZ4_compress_continue + * Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio + * Previous data blocks are assumed to still be present at their previous location. + */ +int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize); + +/* + * LZ4_compress_limitedOutput_continue + * Same as before, but also specify a maximum target compressed size (maxOutputSize) + * If objective cannot be met, compression exits, and returns a zero. + */ +int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize); + +/* + * LZ4_saveDict + * If previously compressed data block is not guaranteed to remain available at its memory location + * save it into a safer place (char* safeBuffer) + * Note : you don't need to call LZ4_loadDict() afterwards, + * dictionary is immediately usable, you can therefore call again LZ4_compress_continue() + * Return : dictionary size in bytes, or 0 if error + * Note : any dictSize > 64 KB will be interpreted as 64KB. + */ +int LZ4_saveDict (LZ4_stream_t* LZ4_streamPtr, char* safeBuffer, int dictSize); + + +/************************************************ + Streaming Decompression Functions +************************************************/ + +#define LZ4_STREAMDECODESIZE_U64 4 +#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long)) +typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t; +/* + * LZ4_streamDecode_t + * information structure to track an LZ4 stream. + * init this structure content using LZ4_setStreamDecode or memset() before first use ! + * If you prefer dynamic allocation methods : + * LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure + * LZ4_freeStreamDecode releases its memory. + */ +LZ4_streamDecode_t* LZ4_createStreamDecode(void); +int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream); + +/* + * LZ4_setStreamDecode + * Use this function to instruct where to find the dictionary. + * Setting a size of 0 is allowed (same effect as reset). + * Return : 1 if OK, 0 if error + */ +int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize); + +/* +*_continue() : + These decoding functions allow decompression of multiple blocks in "streaming" mode. + Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB) + If this condition is not possible, save the relevant part of decoded data into a safe buffer, + and indicate where is its new address using LZ4_setStreamDecode() +*/ +int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize); +int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize); + + +/* +Advanced decoding functions : +*_usingDict() : + These decoding functions work the same as + a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue() + They are stand-alone and don't use nor update an LZ4_streamDecode_t structure. +*/ +int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize); +int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize); + + + +/************************************** + Obsolete Functions +**************************************/ +/* +Obsolete decompression functions +These function names are deprecated and should no longer be used. +They are only provided here for compatibility with older user programs. +- LZ4_uncompress is the same as LZ4_decompress_fast +- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe +These function prototypes are now disabled; uncomment them if you really need them. +It is highly recommended to stop using these functions and migrate to newer ones */ +/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */ +/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */ + + +/* Obsolete streaming functions; use new streaming interface whenever possible */ +void* LZ4_create (const char* inputBuffer); +int LZ4_sizeofStreamState(void); +int LZ4_resetStreamState(void* state, const char* inputBuffer); +char* LZ4_slideInputBuffer (void* state); + +/* Obsolete streaming decoding functions */ +int LZ4_decompress_safe_withPrefix64k (const char* source, char* dest, int compressedSize, int maxOutputSize); +int LZ4_decompress_fast_withPrefix64k (const char* source, char* dest, int originalSize); + + +#if defined (__cplusplus) +} +#endif diff --git a/lib/lz4.o b/lib/lz4.o Binary files differnew file mode 100644 index 0000000..2ed244d --- /dev/null +++ b/lib/lz4.o diff --git a/lib/lz4frame.c b/lib/lz4frame.c new file mode 100644 index 0000000..aa46152 --- /dev/null +++ b/lib/lz4frame.c @@ -0,0 +1,1330 @@ +/* +LZ4 auto-framing library +Copyright (C) 2011-2014, Yann Collet. +BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + +* Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. +* Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +You can contact the author at : +- LZ4 source repository : http://code.google.com/p/lz4/ +- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +/* LZ4F is a stand-alone API to create LZ4-compressed Frames +* fully conformant to specification v1.4.1. +* All related operations, including memory management, are handled by the library. +* */ + + +/************************************** +Compiler Options +**************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#endif + +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +#ifdef __GNUC__ +# pragma GCC diagnostic ignored "-Wmissing-braces" /* GCC bug 53119 : doesn't accept { 0 } as initializer (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119) */ +# pragma GCC diagnostic ignored "-Wmissing-field-initializers" /* GCC bug 53119 : doesn't accept { 0 } as initializer (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119) */ +#endif + + +/************************************** +Memory routines +**************************************/ +#include <stdlib.h> /* malloc, calloc, free */ +#define ALLOCATOR(s) calloc(1,s) +#define FREEMEM free +#include <string.h> /* memset, memcpy, memmove */ +#define MEM_INIT memset + + +/************************************** +Includes +**************************************/ +#include "lz4frame.h" +#include "lz4.h" +#include "lz4hc.h" +#include "xxhash.h" + + +/************************************** +Basic Types +**************************************/ +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ +# include <stdint.h> +typedef uint8_t BYTE; +typedef uint16_t U16; +typedef uint32_t U32; +typedef int32_t S32; +typedef uint64_t U64; +#else +typedef unsigned char BYTE; +typedef unsigned short U16; +typedef unsigned int U32; +typedef signed int S32; +typedef unsigned long long U64; +#endif + + +/************************************** +Constants +**************************************/ +#define KB *(1<<10) +#define MB *(1<<20) +#define GB *(1<<30) + +#define _1BIT 0x01 +#define _2BITS 0x03 +#define _3BITS 0x07 +#define _4BITS 0x0F +#define _8BITS 0xFF + +#define LZ4F_MAGICNUMBER 0x184D2204U +#define LZ4F_BLOCKUNCOMPRESSED_FLAG 0x80000000U +#define LZ4F_MAXHEADERFRAME_SIZE 7 +#define LZ4F_BLOCKSIZEID_DEFAULT max64KB + +static const U32 minHClevel = 3; + +/************************************** +Structures and local types +**************************************/ +typedef struct +{ + LZ4F_preferences_t prefs; + U32 version; + U32 cStage; + size_t maxBlockSize; + size_t maxBufferSize; + BYTE* tmpBuff; + BYTE* tmpIn; + size_t tmpInSize; + XXH32_state_t xxh; + void* lz4CtxPtr; + U32 lz4CtxLevel; /* 0: unallocated; 1: LZ4_stream_t; 3: LZ4_streamHC_t */ +} LZ4F_cctx_internal_t; + +typedef struct +{ + LZ4F_frameInfo_t frameInfo; + unsigned version; + unsigned dStage; + size_t maxBlockSize; + size_t maxBufferSize; + const BYTE* srcExpect; + BYTE* tmpIn; + size_t tmpInSize; + size_t tmpInTarget; + BYTE* tmpOutBuffer; + BYTE* dict; + size_t dictSize; + BYTE* tmpOut; + size_t tmpOutSize; + size_t tmpOutStart; + XXH32_state_t xxh; + BYTE header[8]; +} LZ4F_dctx_internal_t; + + +/************************************** +Macros +**************************************/ + + +/************************************** +Error management +**************************************/ +#define LZ4F_GENERATE_STRING(STRING) #STRING, +static const char* LZ4F_errorStrings[] = { LZ4F_LIST_ERRORS(LZ4F_GENERATE_STRING) }; + + +int LZ4F_isError(LZ4F_errorCode_t code) +{ + return (code > (LZ4F_errorCode_t)(-ERROR_maxCode)); +} + +const char* LZ4F_getErrorName(LZ4F_errorCode_t code) +{ + static const char* codeError = "Unspecified error code"; + if (LZ4F_isError(code)) return LZ4F_errorStrings[-(int)(code)]; + return codeError; +} + + +/************************************** +Private functions +**************************************/ +static size_t LZ4F_getBlockSize(unsigned blockSizeID) +{ + static const size_t blockSizes[4] = { 64 KB, 256 KB, 1 MB, 4 MB }; + + if (blockSizeID == 0) blockSizeID = LZ4F_BLOCKSIZEID_DEFAULT; + blockSizeID -= 4; + if (blockSizeID > 3) return (size_t)-ERROR_maxBlockSize_invalid; + return blockSizes[blockSizeID]; +} + + +/* unoptimized version; solves endianess & alignment issues */ +static void LZ4F_writeLE32 (BYTE* dstPtr, U32 value32) +{ + dstPtr[0] = (BYTE)value32; + dstPtr[1] = (BYTE)(value32 >> 8); + dstPtr[2] = (BYTE)(value32 >> 16); + dstPtr[3] = (BYTE)(value32 >> 24); +} + +static U32 LZ4F_readLE32 (const BYTE* srcPtr) +{ + U32 value32 = srcPtr[0]; + value32 += (srcPtr[1]<<8); + value32 += (srcPtr[2]<<16); + value32 += (srcPtr[3]<<24); + return value32; +} + + +static BYTE LZ4F_headerChecksum (const BYTE* header, size_t length) +{ + U32 xxh = XXH32(header, (U32)length, 0); + return (BYTE)(xxh >> 8); +} + + +/************************************** +Simple compression functions +**************************************/ +size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr) +{ + LZ4F_preferences_t prefs = { 0 }; + size_t headerSize; + size_t streamSize; + + if (preferencesPtr!=NULL) prefs = *preferencesPtr; + { + blockSizeID_t proposedBSID = max64KB; + size_t maxBlockSize = 64 KB; + while (prefs.frameInfo.blockSizeID > proposedBSID) + { + if (srcSize <= maxBlockSize) + { + prefs.frameInfo.blockSizeID = proposedBSID; + break; + } + proposedBSID++; + maxBlockSize <<= 2; + } + } + prefs.autoFlush = 1; + + headerSize = 7; /* basic header size (no option) including magic number */ + streamSize = LZ4F_compressBound(srcSize, &prefs); + + return headerSize + streamSize; +} + + +/* LZ4F_compressFrame() +* Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.4.1, in a single step. +* The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. +* You can get the minimum value of dstMaxSize by using LZ4F_compressFrameBound() +* If this condition is not respected, LZ4F_compressFrame() will fail (result is an errorCode) +* The LZ4F_preferences_t structure is optional : you can provide NULL as argument. All preferences will be set to default. +* The result of the function is the number of bytes written into dstBuffer. +* The function outputs an error code if it fails (can be tested using LZ4F_isError()) +*/ +size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr) +{ + LZ4F_cctx_internal_t cctxI = { 0 }; /* works because no allocation */ + LZ4F_preferences_t prefs = { 0 }; + LZ4F_compressOptions_t options = { 0 }; + LZ4F_errorCode_t errorCode; + BYTE* const dstStart = (BYTE*) dstBuffer; + BYTE* dstPtr = dstStart; + BYTE* const dstEnd = dstStart + dstMaxSize; + + + cctxI.version = LZ4F_VERSION; + cctxI.maxBufferSize = 5 MB; /* mess with real buffer size to prevent allocation; works because autoflush==1 & stableSrc==1 */ + + if (preferencesPtr!=NULL) prefs = *preferencesPtr; + { + blockSizeID_t proposedBSID = max64KB; + size_t maxBlockSize = 64 KB; + while (prefs.frameInfo.blockSizeID > proposedBSID) + { + if (srcSize <= maxBlockSize) + { + prefs.frameInfo.blockSizeID = proposedBSID; + break; + } + proposedBSID++; + maxBlockSize <<= 2; + } + } + prefs.autoFlush = 1; + if (srcSize <= LZ4F_getBlockSize(prefs.frameInfo.blockSizeID)) + prefs.frameInfo.blockMode = blockIndependent; /* no need for linked blocks */ + + options.stableSrc = 1; + + if (dstMaxSize < LZ4F_compressFrameBound(srcSize, &prefs)) + return (size_t)-ERROR_dstMaxSize_tooSmall; + + errorCode = LZ4F_compressBegin(&cctxI, dstBuffer, dstMaxSize, &prefs); /* write header */ + if (LZ4F_isError(errorCode)) return errorCode; + dstPtr += errorCode; /* header size */ + + dstMaxSize -= errorCode; + errorCode = LZ4F_compressUpdate(&cctxI, dstPtr, dstMaxSize, srcBuffer, srcSize, &options); + if (LZ4F_isError(errorCode)) return errorCode; + dstPtr += errorCode; + + errorCode = LZ4F_compressEnd(&cctxI, dstPtr, dstEnd-dstPtr, &options); /* flush last block, and generate suffix */ + if (LZ4F_isError(errorCode)) return errorCode; + dstPtr += errorCode; + + FREEMEM(cctxI.lz4CtxPtr); + + return (dstPtr - dstStart); +} + + +/*********************************** +* Advanced compression functions +* *********************************/ + +/* LZ4F_createCompressionContext() : +* The first thing to do is to create a compressionContext object, which will be used in all compression operations. +* This is achieved using LZ4F_createCompressionContext(), which takes as argument a version and an LZ4F_preferences_t structure. +* The version provided MUST be LZ4F_VERSION. It is intended to track potential version differences between different binaries. +* The function will provide a pointer to an allocated LZ4F_compressionContext_t object. +* If the result LZ4F_errorCode_t is not OK_NoError, there was an error during context creation. +* Object can release its memory using LZ4F_freeCompressionContext(); +*/ +LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* LZ4F_compressionContextPtr, unsigned version) +{ + LZ4F_cctx_internal_t* cctxPtr; + + cctxPtr = (LZ4F_cctx_internal_t*)ALLOCATOR(sizeof(LZ4F_cctx_internal_t)); + if (cctxPtr==NULL) return (LZ4F_errorCode_t)(-ERROR_allocation_failed); + + cctxPtr->version = version; + cctxPtr->cStage = 0; /* Next stage : write header */ + + *LZ4F_compressionContextPtr = (LZ4F_compressionContext_t)cctxPtr; + + return OK_NoError; +} + + +LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_compressionContext) +{ + LZ4F_cctx_internal_t* cctxPtr = (LZ4F_cctx_internal_t*)LZ4F_compressionContext; + + FREEMEM(cctxPtr->lz4CtxPtr); + FREEMEM(cctxPtr->tmpBuff); + FREEMEM(LZ4F_compressionContext); + + return OK_NoError; +} + + +/* LZ4F_compressBegin() : +* will write the frame header into dstBuffer. +* dstBuffer must be large enough to accommodate a header (dstMaxSize). Maximum header size is LZ4F_MAXHEADERFRAME_SIZE bytes. +* The result of the function is the number of bytes written into dstBuffer for the header +* or an error code (can be tested using LZ4F_isError()) +*/ +size_t LZ4F_compressBegin(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* preferencesPtr) +{ + LZ4F_preferences_t prefNull = { 0 }; + LZ4F_cctx_internal_t* cctxPtr = (LZ4F_cctx_internal_t*)compressionContext; + BYTE* const dstStart = (BYTE*)dstBuffer; + BYTE* dstPtr = dstStart; + BYTE* headerStart; + size_t requiredBuffSize; + + if (dstMaxSize < LZ4F_MAXHEADERFRAME_SIZE) return (size_t)-ERROR_dstMaxSize_tooSmall; + if (cctxPtr->cStage != 0) return (size_t)-ERROR_GENERIC; + if (preferencesPtr == NULL) preferencesPtr = &prefNull; + cctxPtr->prefs = *preferencesPtr; + + /* ctx Management */ + { + U32 targetCtxLevel = cctxPtr->prefs.compressionLevel<minHClevel ? 1 : 2; + if (cctxPtr->lz4CtxLevel < targetCtxLevel) + { + FREEMEM(cctxPtr->lz4CtxPtr); + if (cctxPtr->prefs.compressionLevel<minHClevel) + cctxPtr->lz4CtxPtr = (void*)LZ4_createStream(); + else + cctxPtr->lz4CtxPtr = (void*)LZ4_createStreamHC(); + cctxPtr->lz4CtxLevel = targetCtxLevel; + } + } + + /* Buffer Management */ + if (cctxPtr->prefs.frameInfo.blockSizeID == 0) cctxPtr->prefs.frameInfo.blockSizeID = LZ4F_BLOCKSIZEID_DEFAULT; + cctxPtr->maxBlockSize = LZ4F_getBlockSize(cctxPtr->prefs.frameInfo.blockSizeID); + + requiredBuffSize = cctxPtr->maxBlockSize + ((cctxPtr->prefs.frameInfo.blockMode == blockLinked) * 128 KB); + if (preferencesPtr->autoFlush) + requiredBuffSize = (cctxPtr->prefs.frameInfo.blockMode == blockLinked) * 64 KB; /* just needs dict */ + + if (cctxPtr->maxBufferSize < requiredBuffSize) + { + cctxPtr->maxBufferSize = requiredBuffSize; + FREEMEM(cctxPtr->tmpBuff); + cctxPtr->tmpBuff = (BYTE*)ALLOCATOR(requiredBuffSize); + if (cctxPtr->tmpBuff == NULL) return (size_t)-ERROR_allocation_failed; + } + cctxPtr->tmpIn = cctxPtr->tmpBuff; + cctxPtr->tmpInSize = 0; + XXH32_reset(&(cctxPtr->xxh), 0); + if (cctxPtr->prefs.compressionLevel<minHClevel) + LZ4_resetStream((LZ4_stream_t*)(cctxPtr->lz4CtxPtr)); + else + LZ4_resetStreamHC((LZ4_streamHC_t*)(cctxPtr->lz4CtxPtr), cctxPtr->prefs.compressionLevel); + + /* Magic Number */ + LZ4F_writeLE32(dstPtr, LZ4F_MAGICNUMBER); + dstPtr += 4; + headerStart = dstPtr; + + /* FLG Byte */ + *dstPtr++ = ((1 & _2BITS) << 6) /* Version('01') */ + + ((cctxPtr->prefs.frameInfo.blockMode & _1BIT ) << 5) /* Block mode */ + + (char)((cctxPtr->prefs.frameInfo.contentChecksumFlag & _1BIT ) << 2); /* Stream checksum */ + /* BD Byte */ + *dstPtr++ = (char)((cctxPtr->prefs.frameInfo.blockSizeID & _3BITS) << 4); + /* CRC Byte */ + *dstPtr++ = LZ4F_headerChecksum(headerStart, 2); + + cctxPtr->cStage = 1; /* header written, wait for data block */ + + return (dstPtr - dstStart); +} + + +/* LZ4F_compressBound() : gives the size of Dst buffer given a srcSize to handle worst case situations. +* The LZ4F_frameInfo_t structure is optional : +* you can provide NULL as argument, all preferences will then be set to default. +* */ +size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr) +{ + const LZ4F_preferences_t prefsNull = { 0 }; + const LZ4F_preferences_t* prefsPtr = (preferencesPtr==NULL) ? &prefsNull : preferencesPtr; + blockSizeID_t bid = prefsPtr->frameInfo.blockSizeID; + size_t blockSize = LZ4F_getBlockSize(bid); + unsigned nbBlocks = (unsigned)(srcSize / blockSize) + 1; + size_t lastBlockSize = prefsPtr->autoFlush ? srcSize % blockSize : blockSize; + size_t blockInfo = 4; /* default, without block CRC option */ + size_t frameEnd = 4 + (prefsPtr->frameInfo.contentChecksumFlag*4); + size_t result = (blockInfo * nbBlocks) + (blockSize * (nbBlocks-1)) + lastBlockSize + frameEnd; + + return result; +} + + +typedef int (*compressFunc_t)(void* ctx, const char* src, char* dst, int srcSize, int dstSize, int level); + +static size_t LZ4F_compressBlock(void* dst, const void* src, size_t srcSize, compressFunc_t compress, void* lz4ctx, int level) +{ + /* compress one block */ + BYTE* cSizePtr = (BYTE*)dst; + U32 cSize; + cSize = (U32)compress(lz4ctx, (const char*)src, (char*)(cSizePtr+4), (int)(srcSize), (int)(srcSize-1), level); + LZ4F_writeLE32(cSizePtr, cSize); + if (cSize == 0) /* compression failed */ + { + cSize = (U32)srcSize; + LZ4F_writeLE32(cSizePtr, cSize + LZ4F_BLOCKUNCOMPRESSED_FLAG); + memcpy(cSizePtr+4, src, srcSize); + } + return cSize + 4; +} + + +static int LZ4F_localLZ4_compress_limitedOutput_withState(void* ctx, const char* src, char* dst, int srcSize, int dstSize, int level) +{ + (void) level; + return LZ4_compress_limitedOutput_withState(ctx, src, dst, srcSize, dstSize); +} + +static int LZ4F_localLZ4_compress_limitedOutput_continue(void* ctx, const char* src, char* dst, int srcSize, int dstSize, int level) +{ + (void) level; + return LZ4_compress_limitedOutput_continue((LZ4_stream_t*)ctx, src, dst, srcSize, dstSize); +} + +static int LZ4F_localLZ4_compressHC_limitedOutput_continue(void* ctx, const char* src, char* dst, int srcSize, int dstSize, int level) +{ + (void) level; + return LZ4_compressHC_limitedOutput_continue((LZ4_streamHC_t*)ctx, src, dst, srcSize, dstSize); +} + +static compressFunc_t LZ4F_selectCompression(blockMode_t blockMode, U32 level) +{ + if (level < minHClevel) + { + if (blockMode == blockIndependent) return LZ4F_localLZ4_compress_limitedOutput_withState; + return LZ4F_localLZ4_compress_limitedOutput_continue; + } + if (blockMode == blockIndependent) return LZ4_compressHC2_limitedOutput_withStateHC; + return LZ4F_localLZ4_compressHC_limitedOutput_continue; +} + +static int LZ4F_localSaveDict(LZ4F_cctx_internal_t* cctxPtr) +{ + if (cctxPtr->prefs.compressionLevel < minHClevel) + return LZ4_saveDict ((LZ4_stream_t*)(cctxPtr->lz4CtxPtr), (char*)(cctxPtr->tmpBuff), 64 KB); + return LZ4_saveDictHC ((LZ4_streamHC_t*)(cctxPtr->lz4CtxPtr), (char*)(cctxPtr->tmpBuff), 64 KB); +} + +typedef enum { notDone, fromTmpBuffer, fromSrcBuffer } LZ4F_lastBlockStatus; + +/* LZ4F_compressUpdate() +* LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary. +* The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. +* If this condition is not respected, LZ4F_compress() will fail (result is an errorCode) +* You can get the minimum value of dstMaxSize by using LZ4F_compressBound() +* The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. +* The result of the function is the number of bytes written into dstBuffer : it can be zero, meaning input data was just buffered. +* The function outputs an error code if it fails (can be tested using LZ4F_isError()) +*/ +size_t LZ4F_compressUpdate(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* compressOptionsPtr) +{ + LZ4F_compressOptions_t cOptionsNull = { 0 }; + LZ4F_cctx_internal_t* cctxPtr = (LZ4F_cctx_internal_t*)compressionContext; + size_t blockSize = cctxPtr->maxBlockSize; + const BYTE* srcPtr = (const BYTE*)srcBuffer; + const BYTE* const srcEnd = srcPtr + srcSize; + BYTE* const dstStart = (BYTE*)dstBuffer; + BYTE* dstPtr = dstStart; + LZ4F_lastBlockStatus lastBlockCompressed = notDone; + compressFunc_t compress; + + + if (cctxPtr->cStage != 1) return (size_t)-ERROR_GENERIC; + if (dstMaxSize < LZ4F_compressBound(srcSize, &(cctxPtr->prefs))) return (size_t)-ERROR_dstMaxSize_tooSmall; + if (compressOptionsPtr == NULL) compressOptionsPtr = &cOptionsNull; + + /* select compression function */ + compress = LZ4F_selectCompression(cctxPtr->prefs.frameInfo.blockMode, cctxPtr->prefs.compressionLevel); + + /* complete tmp buffer */ + if (cctxPtr->tmpInSize > 0) /* some data already within tmp buffer */ + { + size_t sizeToCopy = blockSize - cctxPtr->tmpInSize; + if (sizeToCopy > srcSize) + { + /* add src to tmpIn buffer */ + memcpy(cctxPtr->tmpIn + cctxPtr->tmpInSize, srcBuffer, srcSize); + srcPtr = srcEnd; + cctxPtr->tmpInSize += srcSize; + /* still needs some CRC */ + } + else + { + /* complete tmpIn block and then compress it */ + lastBlockCompressed = fromTmpBuffer; + memcpy(cctxPtr->tmpIn + cctxPtr->tmpInSize, srcBuffer, sizeToCopy); + srcPtr += sizeToCopy; + + dstPtr += LZ4F_compressBlock(dstPtr, cctxPtr->tmpIn, blockSize, compress, cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel); + + if (cctxPtr->prefs.frameInfo.blockMode==blockLinked) cctxPtr->tmpIn += blockSize; + cctxPtr->tmpInSize = 0; + } + } + + while ((size_t)(srcEnd - srcPtr) >= blockSize) + { + /* compress full block */ + lastBlockCompressed = fromSrcBuffer; + dstPtr += LZ4F_compressBlock(dstPtr, srcPtr, blockSize, compress, cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel); + srcPtr += blockSize; + } + + if ((cctxPtr->prefs.autoFlush) && (srcPtr < srcEnd)) + { + /* compress remaining input < blockSize */ + lastBlockCompressed = fromSrcBuffer; + dstPtr += LZ4F_compressBlock(dstPtr, srcPtr, srcEnd - srcPtr, compress, cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel); + srcPtr = srcEnd; + } + + /* preserve dictionary if necessary */ + if ((cctxPtr->prefs.frameInfo.blockMode==blockLinked) && (lastBlockCompressed==fromSrcBuffer)) + { + if (compressOptionsPtr->stableSrc) + { + cctxPtr->tmpIn = cctxPtr->tmpBuff; + } + else + { + int realDictSize = LZ4F_localSaveDict(cctxPtr); + if (realDictSize==0) return (size_t)-ERROR_GENERIC; + cctxPtr->tmpIn = cctxPtr->tmpBuff + realDictSize; + } + } + + /* keep tmpIn within limits */ + if ((cctxPtr->tmpIn + blockSize) > (cctxPtr->tmpBuff + cctxPtr->maxBufferSize) /* necessarily blockLinked && lastBlockCompressed==fromTmpBuffer */ + && !(cctxPtr->prefs.autoFlush)) + { + LZ4F_localSaveDict(cctxPtr); + cctxPtr->tmpIn = cctxPtr->tmpBuff + 64 KB; + } + + /* some input data left, necessarily < blockSize */ + if (srcPtr < srcEnd) + { + /* fill tmp buffer */ + size_t sizeToCopy = srcEnd - srcPtr; + memcpy(cctxPtr->tmpIn, srcPtr, sizeToCopy); + cctxPtr->tmpInSize = sizeToCopy; + } + + if (cctxPtr->prefs.frameInfo.contentChecksumFlag == contentChecksumEnabled) + XXH32_update(&(cctxPtr->xxh), srcBuffer, (unsigned)srcSize); + + return dstPtr - dstStart; +} + + +/* LZ4F_flush() +* Should you need to create compressed data immediately, without waiting for a block to be filled, +* you can call LZ4_flush(), which will immediately compress any remaining data stored within compressionContext. +* The result of the function is the number of bytes written into dstBuffer +* (it can be zero, this means there was no data left within compressionContext) +* The function outputs an error code if it fails (can be tested using LZ4F_isError()) +* The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. +*/ +size_t LZ4F_flush(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr) +{ + LZ4F_compressOptions_t cOptionsNull = { 0 }; + LZ4F_cctx_internal_t* cctxPtr = (LZ4F_cctx_internal_t*)compressionContext; + BYTE* const dstStart = (BYTE*)dstBuffer; + BYTE* dstPtr = dstStart; + compressFunc_t compress; + + + if (cctxPtr->tmpInSize == 0) return 0; /* nothing to flush */ + if (cctxPtr->cStage != 1) return (size_t)-ERROR_GENERIC; + if (dstMaxSize < (cctxPtr->tmpInSize + 16)) return (size_t)-ERROR_dstMaxSize_tooSmall; + if (compressOptionsPtr == NULL) compressOptionsPtr = &cOptionsNull; + (void)compressOptionsPtr; /* not yet useful */ + + /* select compression function */ + compress = LZ4F_selectCompression(cctxPtr->prefs.frameInfo.blockMode, cctxPtr->prefs.compressionLevel); + + /* compress tmp buffer */ + dstPtr += LZ4F_compressBlock(dstPtr, cctxPtr->tmpIn, cctxPtr->tmpInSize, compress, cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel); + if (cctxPtr->prefs.frameInfo.blockMode==blockLinked) cctxPtr->tmpIn += cctxPtr->tmpInSize; + cctxPtr->tmpInSize = 0; + + /* keep tmpIn within limits */ + if ((cctxPtr->tmpIn + cctxPtr->maxBlockSize) > (cctxPtr->tmpBuff + cctxPtr->maxBufferSize)) /* necessarily blockLinked */ + { + LZ4F_localSaveDict(cctxPtr); + cctxPtr->tmpIn = cctxPtr->tmpBuff + 64 KB; + } + + return dstPtr - dstStart; +} + + +/* LZ4F_compressEnd() +* When you want to properly finish the compressed frame, just call LZ4F_compressEnd(). +* It will flush whatever data remained within compressionContext (like LZ4_flush()) +* but also properly finalize the frame, with an endMark and a checksum. +* The result of the function is the number of bytes written into dstBuffer (necessarily >= 4 (endMark size)) +* The function outputs an error code if it fails (can be tested using LZ4F_isError()) +* The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. +* compressionContext can then be used again, starting with LZ4F_compressBegin(). The preferences will remain the same. +*/ +size_t LZ4F_compressEnd(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr) +{ + LZ4F_cctx_internal_t* cctxPtr = (LZ4F_cctx_internal_t*)compressionContext; + BYTE* const dstStart = (BYTE*)dstBuffer; + BYTE* dstPtr = dstStart; + size_t errorCode; + + errorCode = LZ4F_flush(compressionContext, dstBuffer, dstMaxSize, compressOptionsPtr); + if (LZ4F_isError(errorCode)) return errorCode; + dstPtr += errorCode; + + LZ4F_writeLE32(dstPtr, 0); + dstPtr+=4; /* endMark */ + + if (cctxPtr->prefs.frameInfo.contentChecksumFlag == contentChecksumEnabled) + { + U32 xxh = XXH32_digest(&(cctxPtr->xxh)); + LZ4F_writeLE32(dstPtr, xxh); + dstPtr+=4; /* content Checksum */ + } + + cctxPtr->cStage = 0; /* state is now re-usable (with identical preferences) */ + + return dstPtr - dstStart; +} + + +/*********************************** +* Decompression functions +* *********************************/ + +/* Resource management */ + +/* LZ4F_createDecompressionContext() : +* The first thing to do is to create a decompressionContext object, which will be used in all decompression operations. +* This is achieved using LZ4F_createDecompressionContext(). +* The function will provide a pointer to a fully allocated and initialized LZ4F_decompressionContext object. +* If the result LZ4F_errorCode_t is not zero, there was an error during context creation. +* Object can release its memory using LZ4F_freeDecompressionContext(); +*/ +LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_compressionContext_t* LZ4F_decompressionContextPtr, unsigned versionNumber) +{ + LZ4F_dctx_internal_t* dctxPtr; + + dctxPtr = ALLOCATOR(sizeof(LZ4F_dctx_internal_t)); + if (dctxPtr==NULL) return (LZ4F_errorCode_t)-ERROR_GENERIC; + + dctxPtr->version = versionNumber; + *LZ4F_decompressionContextPtr = (LZ4F_compressionContext_t)dctxPtr; + return OK_NoError; +} + +LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_compressionContext_t LZ4F_decompressionContext) +{ + LZ4F_dctx_internal_t* dctxPtr = (LZ4F_dctx_internal_t*)LZ4F_decompressionContext; + FREEMEM(dctxPtr->tmpIn); + FREEMEM(dctxPtr->tmpOutBuffer); + FREEMEM(dctxPtr); + return OK_NoError; +} + + +/* Decompression */ + +static size_t LZ4F_decodeHeader(LZ4F_dctx_internal_t* dctxPtr, const BYTE* srcPtr, size_t srcSize) +{ + BYTE FLG, BD, HC; + unsigned version, blockMode, blockChecksumFlag, contentSizeFlag, contentChecksumFlag, dictFlag, blockSizeID; + size_t bufferNeeded; + + /* need to decode header to get frameInfo */ + if (srcSize < 7) return (size_t)-ERROR_GENERIC; /* minimal header size */ + + /* control magic number */ + if (LZ4F_readLE32(srcPtr) != LZ4F_MAGICNUMBER) return (size_t)-ERROR_GENERIC; + srcPtr += 4; + + /* Flags */ + FLG = srcPtr[0]; + version = (FLG>>6)&_2BITS; + blockMode = (FLG>>5) & _1BIT; + blockChecksumFlag = (FLG>>4) & _1BIT; + contentSizeFlag = (FLG>>3) & _1BIT; + contentChecksumFlag = (FLG>>2) & _1BIT; + dictFlag = (FLG>>0) & _1BIT; + BD = srcPtr[1]; + blockSizeID = (BD>>4) & _3BITS; + + /* check */ + HC = LZ4F_headerChecksum(srcPtr, 2); + if (HC != srcPtr[2]) return (size_t)-ERROR_GENERIC; /* Bad header checksum error */ + + /* validate */ + if (version != 1) return (size_t)-ERROR_GENERIC; /* Version Number, only supported value */ + if (blockChecksumFlag != 0) return (size_t)-ERROR_GENERIC; /* Only supported value for the time being */ + if (contentSizeFlag != 0) return (size_t)-ERROR_GENERIC; /* Only supported value for the time being */ + if (((FLG>>1)&_1BIT) != 0) return (size_t)-ERROR_GENERIC; /* Reserved bit */ + if (dictFlag != 0) return (size_t)-ERROR_GENERIC; /* Only supported value for the time being */ + if (((BD>>7)&_1BIT) != 0) return (size_t)-ERROR_GENERIC; /* Reserved bit */ + if (blockSizeID < 4) return (size_t)-ERROR_GENERIC; /* Only supported values for the time being */ + if (((BD>>0)&_4BITS) != 0) return (size_t)-ERROR_GENERIC; /* Reserved bits */ + + /* save */ + dctxPtr->frameInfo.blockMode = blockMode; + dctxPtr->frameInfo.contentChecksumFlag = contentChecksumFlag; + dctxPtr->frameInfo.blockSizeID = blockSizeID; + dctxPtr->maxBlockSize = LZ4F_getBlockSize(blockSizeID); + + /* init */ + if (contentChecksumFlag) XXH32_reset(&(dctxPtr->xxh), 0); + + /* alloc */ + bufferNeeded = dctxPtr->maxBlockSize + ((dctxPtr->frameInfo.blockMode==blockLinked) * 128 KB); + if (bufferNeeded > dctxPtr->maxBufferSize) /* tmp buffers too small */ + { + FREEMEM(dctxPtr->tmpIn); + FREEMEM(dctxPtr->tmpOutBuffer); + dctxPtr->maxBufferSize = bufferNeeded; + dctxPtr->tmpIn = ALLOCATOR(dctxPtr->maxBlockSize); + if (dctxPtr->tmpIn == NULL) return (size_t)-ERROR_GENERIC; + dctxPtr->tmpOutBuffer= ALLOCATOR(dctxPtr->maxBufferSize); + if (dctxPtr->tmpOutBuffer== NULL) return (size_t)-ERROR_GENERIC; + } + dctxPtr->tmpInSize = 0; + dctxPtr->tmpInTarget = 0; + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = 0; + dctxPtr->tmpOut = dctxPtr->tmpOutBuffer; + dctxPtr->tmpOutStart = 0; + dctxPtr->tmpOutSize = 0; + + return 7; +} + + +typedef enum { dstage_getHeader=0, dstage_storeHeader, dstage_decodeHeader, + dstage_getCBlockSize, dstage_storeCBlockSize, dstage_decodeCBlockSize, + dstage_copyDirect, + dstage_getCBlock, dstage_storeCBlock, dstage_decodeCBlock, + dstage_decodeCBlock_intoDst, dstage_decodeCBlock_intoTmp, dstage_flushOut, + dstage_getSuffix, dstage_storeSuffix, dstage_checkSuffix +} dStage_t; + + +/* LZ4F_getFrameInfo() +* This function decodes frame header information, such as blockSize. +* It is optional : you could start by calling directly LZ4F_decompress() instead. +* The objective is to extract header information without starting decompression, typically for allocation purposes. +* LZ4F_getFrameInfo() can also be used *after* starting decompression, on a valid LZ4F_decompressionContext_t. +* The number of bytes read from srcBuffer will be provided within *srcSizePtr (necessarily <= original value). +* You are expected to resume decompression from where it stopped (srcBuffer + *srcSizePtr) +* The function result is an hint of the better srcSize to use for next call to LZ4F_decompress, +* or an error code which can be tested using LZ4F_isError(). +*/ +LZ4F_errorCode_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t decompressionContext, LZ4F_frameInfo_t* frameInfoPtr, const void* srcBuffer, size_t* srcSizePtr) +{ + LZ4F_dctx_internal_t* dctxPtr = (LZ4F_dctx_internal_t*)decompressionContext; + + if (dctxPtr->dStage == dstage_getHeader) + { + LZ4F_errorCode_t errorCode = LZ4F_decodeHeader(dctxPtr, srcBuffer, *srcSizePtr); + if (LZ4F_isError(errorCode)) return errorCode; + *srcSizePtr = errorCode; + *frameInfoPtr = dctxPtr->frameInfo; + dctxPtr->srcExpect = NULL; + dctxPtr->dStage = dstage_getCBlockSize; + return 4; + } + + /* frameInfo already decoded */ + *srcSizePtr = 0; + *frameInfoPtr = dctxPtr->frameInfo; + return 0; +} + + +static int LZ4F_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize) +{ + (void)dictStart; + (void)dictSize; + return LZ4_decompress_safe (source, dest, compressedSize, maxDecompressedSize); +} + + + +static void LZ4F_updateDict(LZ4F_dctx_internal_t* dctxPtr, const BYTE* dstPtr, size_t dstSize, const BYTE* dstPtr0, unsigned withinTmp) +{ + if (dctxPtr->dictSize==0) + dctxPtr->dict = (BYTE*)dstPtr; /* priority to dictionary continuity */ + + if (dctxPtr->dict + dctxPtr->dictSize == dstPtr) /* dictionary continuity */ + { + dctxPtr->dictSize += dstSize; + return; + } + + if (dstPtr - dstPtr0 + dstSize >= 64 KB) /* dstBuffer large enough to become dictionary */ + { + dctxPtr->dict = (BYTE*)dstPtr0; + dctxPtr->dictSize = dstPtr - dstPtr0 + dstSize; + return; + } + + if ((withinTmp) && (dctxPtr->dict == dctxPtr->tmpOutBuffer)) + { + /* assumption : dctxPtr->dict + dctxPtr->dictSize == dctxPtr->tmpOut + dctxPtr->tmpOutStart */ + dctxPtr->dictSize += dstSize; + return; + } + + if (withinTmp) /* copy relevant dict portion in front of tmpOut within tmpOutBuffer */ + { +#if 0 + size_t savedDictSize = dctxPtr->tmpOut - dctxPtr->tmpOutBuffer; + memcpy(dctxPtr->tmpOutBuffer, dctxPtr->dict + dctxPtr->dictSize - dctxPtr->tmpOutStart- savedDictSize, savedDictSize); + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = savedDictSize + dctxPtr->tmpOutStart + dstSize; + return; + +#else + + size_t preserveSize = dctxPtr->tmpOut - dctxPtr->tmpOutBuffer; + size_t copySize = 64 KB - dctxPtr->tmpOutSize; + BYTE* oldDictEnd = dctxPtr->dict + dctxPtr->dictSize - dctxPtr->tmpOutStart; + if (dctxPtr->tmpOutSize > 64 KB) copySize = 0; + if (copySize > preserveSize) copySize = preserveSize; + + memcpy(dctxPtr->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize); + + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = preserveSize + dctxPtr->tmpOutStart + dstSize; + return; +#endif + } + + if (dctxPtr->dict == dctxPtr->tmpOutBuffer) /* copy dst into tmp to complete dict */ + { + if (dctxPtr->dictSize + dstSize > dctxPtr->maxBufferSize) /* tmp buffer not large enough */ + { + size_t preserveSize = 64 KB - dstSize; /* note : dstSize < 64 KB */ + memcpy(dctxPtr->dict, dctxPtr->dict + dctxPtr->dictSize - preserveSize, preserveSize); + dctxPtr->dictSize = preserveSize; + } + memcpy(dctxPtr->dict + dctxPtr->dictSize, dstPtr, dstSize); + dctxPtr->dictSize += dstSize; + return; + } + + /* join dict & dest into tmp */ + { + size_t preserveSize = 64 KB - dstSize; /* note : dstSize < 64 KB */ + if (preserveSize > dctxPtr->dictSize) preserveSize = dctxPtr->dictSize; + memcpy(dctxPtr->tmpOutBuffer, dctxPtr->dict + dctxPtr->dictSize - preserveSize, preserveSize); + memcpy(dctxPtr->tmpOutBuffer + preserveSize, dstPtr, dstSize); + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = preserveSize + dstSize; + } +} + + + +/* LZ4F_decompress() +* Call this function repetitively to regenerate data compressed within srcBuffer. +* The function will attempt to decode *srcSizePtr from srcBuffer, into dstBuffer of maximum size *dstSizePtr. +* +* The number of bytes regenerated into dstBuffer will be provided within *dstSizePtr (necessarily <= original value). +* +* The number of bytes effectively read from srcBuffer will be provided within *srcSizePtr (necessarily <= original value). +* If the number of bytes read is < number of bytes provided, then the decompression operation is not complete. +* You will have to call it again, continuing from where it stopped. +* +* The function result is an hint of the better srcSize to use for next call to LZ4F_decompress. +* Basically, it's the size of the current (or remaining) compressed block + header of next block. +* Respecting the hint provides some boost to performance, since it allows less buffer shuffling. +* Note that this is just a hint, you can always provide any srcSize you want. +* When a frame is fully decoded, the function result will be 0. +* If decompression failed, function result is an error code which can be tested using LZ4F_isError(). +*/ +size_t LZ4F_decompress(LZ4F_decompressionContext_t decompressionContext, + void* dstBuffer, size_t* dstSizePtr, + const void* srcBuffer, size_t* srcSizePtr, + const LZ4F_decompressOptions_t* decompressOptionsPtr) +{ + LZ4F_dctx_internal_t* dctxPtr = (LZ4F_dctx_internal_t*)decompressionContext; + static const LZ4F_decompressOptions_t optionsNull = { 0 }; + const BYTE* const srcStart = (const BYTE*)srcBuffer; + const BYTE* const srcEnd = srcStart + *srcSizePtr; + const BYTE* srcPtr = srcStart; + BYTE* const dstStart = (BYTE*)dstBuffer; + BYTE* const dstEnd = dstStart + *dstSizePtr; + BYTE* dstPtr = dstStart; + const BYTE* selectedIn=NULL; + unsigned doAnotherStage = 1; + size_t nextSrcSizeHint = 1; + + + if (decompressOptionsPtr==NULL) decompressOptionsPtr = &optionsNull; + *srcSizePtr = 0; + *dstSizePtr = 0; + + /* expect to continue decoding src buffer where it left previously */ + if (dctxPtr->srcExpect != NULL) + { + if (srcStart != dctxPtr->srcExpect) return (size_t)-ERROR_GENERIC; + } + + /* programmed as a state machine */ + + while (doAnotherStage) + { + + switch(dctxPtr->dStage) + { + + case dstage_getHeader: + { + if (srcEnd-srcPtr >= 7) + { + selectedIn = srcPtr; + srcPtr += 7; + dctxPtr->dStage = dstage_decodeHeader; + break; + } + dctxPtr->tmpInSize = 0; + dctxPtr->dStage = dstage_storeHeader; + break; + } + + case dstage_storeHeader: + { + size_t sizeToCopy = 7 - dctxPtr->tmpInSize; + if (sizeToCopy > (size_t)(srcEnd - srcPtr)) sizeToCopy = srcEnd - srcPtr; + memcpy(dctxPtr->header + dctxPtr->tmpInSize, srcPtr, sizeToCopy); + dctxPtr->tmpInSize += sizeToCopy; + srcPtr += sizeToCopy; + if (dctxPtr->tmpInSize < 7) + { + nextSrcSizeHint = (7 - dctxPtr->tmpInSize) + 4; + doAnotherStage = 0; /* no enough src, wait to get some more */ + break; + } + selectedIn = dctxPtr->header; + dctxPtr->dStage = dstage_decodeHeader; + break; + } + + case dstage_decodeHeader: + { + LZ4F_errorCode_t errorCode = LZ4F_decodeHeader(dctxPtr, selectedIn, 7); + if (LZ4F_isError(errorCode)) return errorCode; + dctxPtr->dStage = dstage_getCBlockSize; + break; + } + + case dstage_getCBlockSize: + { + if ((srcEnd - srcPtr) >= 4) + { + selectedIn = srcPtr; + srcPtr += 4; + dctxPtr->dStage = dstage_decodeCBlockSize; + break; + } + /* not enough input to read cBlockSize field */ + dctxPtr->tmpInSize = 0; + dctxPtr->dStage = dstage_storeCBlockSize; + break; + } + + case dstage_storeCBlockSize: + { + size_t sizeToCopy = 4 - dctxPtr->tmpInSize; + if (sizeToCopy > (size_t)(srcEnd - srcPtr)) sizeToCopy = srcEnd - srcPtr; + memcpy(dctxPtr->tmpIn + dctxPtr->tmpInSize, srcPtr, sizeToCopy); + srcPtr += sizeToCopy; + dctxPtr->tmpInSize += sizeToCopy; + if (dctxPtr->tmpInSize < 4) /* not enough input to get full cBlockSize; wait for more */ + { + nextSrcSizeHint = 4 - dctxPtr->tmpInSize; + doAnotherStage=0; + break; + } + selectedIn = dctxPtr->tmpIn; + dctxPtr->dStage = dstage_decodeCBlockSize; + break; + } + + case dstage_decodeCBlockSize: + { + size_t nextCBlockSize = LZ4F_readLE32(selectedIn) & 0x7FFFFFFFU; + if (nextCBlockSize==0) /* frameEnd signal, no more CBlock */ + { + dctxPtr->dStage = dstage_getSuffix; + break; + } + if (nextCBlockSize > dctxPtr->maxBlockSize) return (size_t)-ERROR_GENERIC; /* invalid cBlockSize */ + dctxPtr->tmpInTarget = nextCBlockSize; + if (LZ4F_readLE32(selectedIn) & LZ4F_BLOCKUNCOMPRESSED_FLAG) + { + dctxPtr->dStage = dstage_copyDirect; + break; + } + dctxPtr->dStage = dstage_getCBlock; + if (dstPtr==dstEnd) + { + nextSrcSizeHint = nextCBlockSize + 4; + doAnotherStage = 0; + } + break; + } + + case dstage_copyDirect: /* uncompressed block */ + { + size_t sizeToCopy = dctxPtr->tmpInTarget; + if ((size_t)(srcEnd-srcPtr) < sizeToCopy) sizeToCopy = srcEnd - srcPtr; /* not enough input to read full block */ + if ((size_t)(dstEnd-dstPtr) < sizeToCopy) sizeToCopy = dstEnd - dstPtr; + memcpy(dstPtr, srcPtr, sizeToCopy); + if (dctxPtr->frameInfo.contentChecksumFlag) XXH32_update(&(dctxPtr->xxh), srcPtr, (U32)sizeToCopy); + + /* dictionary management */ + if (dctxPtr->frameInfo.blockMode==blockLinked) + LZ4F_updateDict(dctxPtr, dstPtr, sizeToCopy, dstStart, 0); + + srcPtr += sizeToCopy; + dstPtr += sizeToCopy; + if (sizeToCopy == dctxPtr->tmpInTarget) /* all copied */ + { + dctxPtr->dStage = dstage_getCBlockSize; + break; + } + dctxPtr->tmpInTarget -= sizeToCopy; /* still need to copy more */ + nextSrcSizeHint = dctxPtr->tmpInTarget + 4; + doAnotherStage = 0; + break; + } + + case dstage_getCBlock: /* entry from dstage_decodeCBlockSize */ + { + if ((size_t)(srcEnd-srcPtr) < dctxPtr->tmpInTarget) + { + dctxPtr->tmpInSize = 0; + dctxPtr->dStage = dstage_storeCBlock; + break; + } + selectedIn = srcPtr; + srcPtr += dctxPtr->tmpInTarget; + dctxPtr->dStage = dstage_decodeCBlock; + break; + } + + case dstage_storeCBlock: + { + size_t sizeToCopy = dctxPtr->tmpInTarget - dctxPtr->tmpInSize; + if (sizeToCopy > (size_t)(srcEnd-srcPtr)) sizeToCopy = srcEnd-srcPtr; + memcpy(dctxPtr->tmpIn + dctxPtr->tmpInSize, srcPtr, sizeToCopy); + dctxPtr->tmpInSize += sizeToCopy; + srcPtr += sizeToCopy; + if (dctxPtr->tmpInSize < dctxPtr->tmpInTarget) /* need more input */ + { + nextSrcSizeHint = (dctxPtr->tmpInTarget - dctxPtr->tmpInSize) + 4; + doAnotherStage=0; + break; + } + selectedIn = dctxPtr->tmpIn; + dctxPtr->dStage = dstage_decodeCBlock; + break; + } + + case dstage_decodeCBlock: + { + if ((size_t)(dstEnd-dstPtr) < dctxPtr->maxBlockSize) /* not enough place into dst : decode into tmpOut */ + dctxPtr->dStage = dstage_decodeCBlock_intoTmp; + else + dctxPtr->dStage = dstage_decodeCBlock_intoDst; + break; + } + + case dstage_decodeCBlock_intoDst: + { + int (*decoder)(const char*, char*, int, int, const char*, int); + int decodedSize; + + if (dctxPtr->frameInfo.blockMode == blockLinked) + decoder = LZ4_decompress_safe_usingDict; + else + decoder = LZ4F_decompress_safe; + + decodedSize = decoder((const char*)selectedIn, (char*)dstPtr, (int)dctxPtr->tmpInTarget, (int)dctxPtr->maxBlockSize, (const char*)dctxPtr->dict, (int)dctxPtr->dictSize); + if (decodedSize < 0) return (size_t)-ERROR_GENERIC; /* decompression failed */ + if (dctxPtr->frameInfo.contentChecksumFlag) XXH32_update(&(dctxPtr->xxh), dstPtr, decodedSize); + + /* dictionary management */ + if (dctxPtr->frameInfo.blockMode==blockLinked) + LZ4F_updateDict(dctxPtr, dstPtr, decodedSize, dstStart, 0); + + dstPtr += decodedSize; + dctxPtr->dStage = dstage_getCBlockSize; + break; + } + + case dstage_decodeCBlock_intoTmp: + { + /* not enough place into dst : decode into tmpOut */ + int (*decoder)(const char*, char*, int, int, const char*, int); + int decodedSize; + + if (dctxPtr->frameInfo.blockMode == blockLinked) + decoder = LZ4_decompress_safe_usingDict; + else + decoder = LZ4F_decompress_safe; + + /* ensure enough place for tmpOut */ + if (dctxPtr->frameInfo.blockMode == blockLinked) + { + if (dctxPtr->dict == dctxPtr->tmpOutBuffer) + { + if (dctxPtr->dictSize > 128 KB) + { + memcpy(dctxPtr->dict, dctxPtr->dict + dctxPtr->dictSize - 64 KB, 64 KB); + dctxPtr->dictSize = 64 KB; + } + dctxPtr->tmpOut = dctxPtr->dict + dctxPtr->dictSize; + } + else /* dict not within tmp */ + { + size_t reservedDictSpace = dctxPtr->dictSize; + if (reservedDictSpace > 64 KB) reservedDictSpace = 64 KB; + dctxPtr->tmpOut = dctxPtr->tmpOutBuffer + reservedDictSpace; + } + } + + /* Decode */ + decodedSize = decoder((const char*)selectedIn, (char*)dctxPtr->tmpOut, (int)dctxPtr->tmpInTarget, (int)dctxPtr->maxBlockSize, (const char*)dctxPtr->dict, (int)dctxPtr->dictSize); + if (decodedSize < 0) return (size_t)-ERROR_decompressionFailed; /* decompression failed */ + if (dctxPtr->frameInfo.contentChecksumFlag) XXH32_update(&(dctxPtr->xxh), dctxPtr->tmpOut, decodedSize); + dctxPtr->tmpOutSize = decodedSize; + dctxPtr->tmpOutStart = 0; + dctxPtr->dStage = dstage_flushOut; + break; + } + + case dstage_flushOut: /* flush decoded data from tmpOut to dstBuffer */ + { + size_t sizeToCopy = dctxPtr->tmpOutSize - dctxPtr->tmpOutStart; + if (sizeToCopy > (size_t)(dstEnd-dstPtr)) sizeToCopy = dstEnd-dstPtr; + memcpy(dstPtr, dctxPtr->tmpOut + dctxPtr->tmpOutStart, sizeToCopy); + + /* dictionary management */ + if (dctxPtr->frameInfo.blockMode==blockLinked) + LZ4F_updateDict(dctxPtr, dstPtr, sizeToCopy, dstStart, 1); + + dctxPtr->tmpOutStart += sizeToCopy; + dstPtr += sizeToCopy; + + /* end of flush ? */ + if (dctxPtr->tmpOutStart == dctxPtr->tmpOutSize) + { + dctxPtr->dStage = dstage_getCBlockSize; + break; + } + nextSrcSizeHint = 4; + doAnotherStage = 0; /* still some data to flush */ + break; + } + + case dstage_getSuffix: + { + size_t suffixSize = dctxPtr->frameInfo.contentChecksumFlag * 4; + if (suffixSize == 0) /* frame completed */ + { + nextSrcSizeHint = 0; + dctxPtr->dStage = dstage_getHeader; + doAnotherStage = 0; + break; + } + if ((srcEnd - srcPtr) >= 4) /* CRC present */ + { + selectedIn = srcPtr; + srcPtr += 4; + dctxPtr->dStage = dstage_checkSuffix; + break; + } + dctxPtr->tmpInSize = 0; + dctxPtr->dStage = dstage_storeSuffix; + break; + } + + case dstage_storeSuffix: + { + size_t sizeToCopy = 4 - dctxPtr->tmpInSize; + if (sizeToCopy > (size_t)(srcEnd - srcPtr)) sizeToCopy = srcEnd - srcPtr; + memcpy(dctxPtr->tmpIn + dctxPtr->tmpInSize, srcPtr, sizeToCopy); + srcPtr += sizeToCopy; + dctxPtr->tmpInSize += sizeToCopy; + if (dctxPtr->tmpInSize < 4) /* not enough input to read complete suffix */ + { + nextSrcSizeHint = 4 - dctxPtr->tmpInSize; + doAnotherStage=0; + break; + } + selectedIn = dctxPtr->tmpIn; + dctxPtr->dStage = dstage_checkSuffix; + break; + } + + case dstage_checkSuffix: + { + U32 readCRC = LZ4F_readLE32(selectedIn); + U32 resultCRC = XXH32_digest(&(dctxPtr->xxh)); + if (readCRC != resultCRC) return (size_t)-ERROR_checksum_invalid; + nextSrcSizeHint = 0; + dctxPtr->dStage = dstage_getHeader; + doAnotherStage = 0; + break; + } + } + } + + /* preserve dictionary within tmp if necessary */ + if ( (dctxPtr->frameInfo.blockMode==blockLinked) + &&(dctxPtr->dict != dctxPtr->tmpOutBuffer) + &&(!decompressOptionsPtr->stableDst) + &&((unsigned)(dctxPtr->dStage-1) < (unsigned)(dstage_getSuffix-1)) + ) + { + if (dctxPtr->dStage == dstage_flushOut) + { + size_t preserveSize = dctxPtr->tmpOut - dctxPtr->tmpOutBuffer; + size_t copySize = 64 KB - dctxPtr->tmpOutSize; + BYTE* oldDictEnd = dctxPtr->dict + dctxPtr->dictSize - dctxPtr->tmpOutStart; + if (dctxPtr->tmpOutSize > 64 KB) copySize = 0; + if (copySize > preserveSize) copySize = preserveSize; + + memcpy(dctxPtr->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize); + + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = preserveSize + dctxPtr->tmpOutStart; + } + else + { + size_t newDictSize = dctxPtr->dictSize; + BYTE* oldDictEnd = dctxPtr->dict + dctxPtr->dictSize; + if ((newDictSize) > 64 KB) newDictSize = 64 KB; + + memcpy(dctxPtr->tmpOutBuffer, oldDictEnd - newDictSize, newDictSize); + + dctxPtr->dict = dctxPtr->tmpOutBuffer; + dctxPtr->dictSize = newDictSize; + dctxPtr->tmpOut = dctxPtr->tmpOutBuffer + newDictSize; + } + } + + if (srcPtr<srcEnd) /* function must be called again with following source data */ + dctxPtr->srcExpect = srcPtr; + else + dctxPtr->srcExpect = NULL; + *srcSizePtr = (srcPtr - srcStart); + *dstSizePtr = (dstPtr - dstStart); + return nextSrcSizeHint; +} diff --git a/lib/lz4frame.h b/lib/lz4frame.h new file mode 100644 index 0000000..a4f5e36 --- /dev/null +++ b/lib/lz4frame.h @@ -0,0 +1,261 @@ +/* + LZ4 auto-framing library + Header File + Copyright (C) 2011-2014, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - LZ4 source repository : http://code.google.com/p/lz4/ + - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +/* LZ4F is a stand-alone API to create LZ4-compressed frames + * fully conformant to specification v1.4.1. + * All related operations, including memory management, are handled by the library. + * You don't need lz4.h when using lz4frame.h. + * */ + +#pragma once + +#if defined (__cplusplus) +extern "C" { +#endif + +/**************************************** + Note : experimental API. + Not yet integrated within lz4 library. +****************************************/ + +/************************************** + Includes +**************************************/ +#include <stddef.h> /* size_t */ + + +/************************************** + Error management +**************************************/ +typedef size_t LZ4F_errorCode_t; +#define LZ4F_LIST_ERRORS(ITEM) \ + ITEM(OK_NoError) ITEM(ERROR_GENERIC) \ + ITEM(ERROR_maxBlockSize_invalid) ITEM(ERROR_blockMode_invalid) ITEM(ERROR_contentChecksumFlag_invalid) \ + ITEM(ERROR_compressionLevel_invalid) \ + ITEM(ERROR_allocation_failed) \ + ITEM(ERROR_srcSize_tooLarge) ITEM(ERROR_dstMaxSize_tooSmall) \ + ITEM(ERROR_decompressionFailed) \ + ITEM(ERROR_checksum_invalid) \ + ITEM(ERROR_maxCode) + +#define LZ4F_GENERATE_ENUM(ENUM) ENUM, +typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM) } LZ4F_errorCodes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */ + +int LZ4F_isError(LZ4F_errorCode_t code); /* Basically : code > -ERROR_maxCode */ +const char* LZ4F_getErrorName(LZ4F_errorCode_t code); /* return enum as string */ + + +/************************************** + Framing compression functions +**************************************/ + +typedef enum { LZ4F_default=0, max64KB=4, max256KB=5, max1MB=6, max4MB=7} blockSizeID_t; +typedef enum { blockLinked=0, blockIndependent} blockMode_t; +typedef enum { noContentChecksum=0, contentChecksumEnabled } contentChecksum_t; + +typedef struct { + blockSizeID_t blockSizeID; /* max64KB, max256KB, max1MB, max4MB ; 0 == default */ + blockMode_t blockMode; /* blockLinked, blockIndependent ; 0 == default */ + contentChecksum_t contentChecksumFlag; /* noContentChecksum, contentChecksumEnabled ; 0 == default */ + unsigned reserved[5]; +} LZ4F_frameInfo_t; + +typedef struct { + LZ4F_frameInfo_t frameInfo; + unsigned compressionLevel; /* Not yet supported : only fast compression for the time being */ + unsigned autoFlush; /* 1 == always flush; reduce need for tmp buffer */ + unsigned reserved[4]; +} LZ4F_preferences_t; + + + +/*********************************** + * Simple compression function + * *********************************/ +size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr); + +size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr); +/* LZ4F_compressFrame() + * Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.4.1, in a single step. + * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. + * You can get the minimum value of dstMaxSize by using LZ4F_compressFrameBound() + * If this condition is not respected, LZ4F_compressFrame() will fail (result is an errorCode) + * The LZ4F_preferences_t structure is optional : you can provide NULL as argument. All preferences will be set to default. + * The result of the function is the number of bytes written into dstBuffer. + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + + + +/********************************** + * Advanced compression functions + * *********************************/ + +typedef void* LZ4F_compressionContext_t; + +typedef struct { + unsigned stableSrc; /* 1 == src content will remain available on future calls to LZ4F_compress(); avoid saving src content within tmp buffer as future dictionary */ + unsigned reserved[3]; +} LZ4F_compressOptions_t; + +/* Resource Management */ + +#define LZ4F_VERSION 100 +LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* LZ4F_compressionContextPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_compressionContext); +/* LZ4F_createCompressionContext() : + * The first thing to do is to create a compressionContext object, which will be used in all compression operations. + * This is achieved using LZ4F_createCompressionContext(), which takes as argument a version and an LZ4F_preferences_t structure. + * The version provided MUST be LZ4F_VERSION. It is intended to track potential version differences between different binaries. + * The function will provide a pointer to a fully allocated LZ4F_compressionContext_t object. + * If the result LZ4F_errorCode_t is not zero, there was an error during context creation. + * Object can release its memory using LZ4F_freeCompressionContext(); + */ + + +/* Compression */ + +size_t LZ4F_compressBegin(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* preferencesPtr); +/* LZ4F_compressBegin() : + * will write the frame header into dstBuffer. + * dstBuffer must be large enough to accommodate a header (dstMaxSize). Maximum header size is 19 bytes. + * The LZ4F_preferences_t structure is optional : you can provide NULL as argument, all preferences will then be set to default. + * The result of the function is the number of bytes written into dstBuffer for the header + * or an error code (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr); +/* LZ4F_compressBound() : + * Provides the minimum size of Dst buffer given srcSize to handle worst case situations. + * preferencesPtr is optional : you can provide NULL as argument, all preferences will then be set to default. + */ + +size_t LZ4F_compressUpdate(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* compressOptionsPtr); +/* LZ4F_compressUpdate() + * LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary. + * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. + * If this condition is not respected, LZ4F_compress() will fail (result is an errorCode) + * You can get the minimum value of dstMaxSize by using LZ4F_compressBound() + * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * The result of the function is the number of bytes written into dstBuffer : it can be zero, meaning input data was just buffered. + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_flush(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr); +/* LZ4F_flush() + * Should you need to create compressed data immediately, without waiting for a block to be filled, + * you can call LZ4_flush(), which will immediately compress any remaining data buffered within compressionContext. + * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * The result of the function is the number of bytes written into dstBuffer + * (it can be zero, this means there was no data left within compressionContext) + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_compressEnd(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr); +/* LZ4F_compressEnd() + * When you want to properly finish the compressed frame, just call LZ4F_compressEnd(). + * It will flush whatever data remained within compressionContext (like LZ4_flush()) + * but also properly finalize the frame, with an endMark and a checksum. + * The result of the function is the number of bytes written into dstBuffer (necessarily >= 4 (endMark size)) + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * compressionContext can then be used again, starting with LZ4F_compressBegin(). + */ + + +/*********************************** + * Decompression functions + * *********************************/ + +typedef void* LZ4F_decompressionContext_t; + +typedef struct { + unsigned stableDst; /* guarantee that decompressed data will still be there on next function calls (avoid storage into tmp buffers) */ + unsigned reserved[3]; +} LZ4F_decompressOptions_t; + +/* Resource management */ + +LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_compressionContext_t* LZ4F_decompressionContextPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_compressionContext_t LZ4F_decompressionContext); +/* LZ4F_createDecompressionContext() : + * The first thing to do is to create a decompressionContext object, which will be used in all decompression operations. + * This is achieved using LZ4F_createDecompressionContext(). + * The function will provide a pointer to a fully allocated and initialized LZ4F_decompressionContext object. + * If the result LZ4F_errorCode_t is not OK_NoError, there was an error during context creation. + * Object can release its memory using LZ4F_freeDecompressionContext(); + */ + +/* Decompression */ + +size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t decompressionContext, LZ4F_frameInfo_t* frameInfoPtr, const void* srcBuffer, size_t* srcSizePtr); +/* LZ4F_getFrameInfo() + * This function decodes frame header information, such as blockSize. + * It is optional : you could start by calling directly LZ4F_decompress() instead. + * The objective is to extract header information without starting decompression, typically for allocation purposes. + * LZ4F_getFrameInfo() can also be used *after* starting decompression, on a valid LZ4F_decompressionContext_t. + * The number of bytes read from srcBuffer will be provided within *srcSizePtr (necessarily <= original value). + * You are expected to resume decompression from where it stopped (srcBuffer + *srcSizePtr) + * The function result is an hint of the better srcSize to use for next call to LZ4F_decompress, + * or an error code which can be tested using LZ4F_isError(). + */ + +size_t LZ4F_decompress(LZ4F_decompressionContext_t decompressionContext, void* dstBuffer, size_t* dstSizePtr, const void* srcBuffer, size_t* srcSizePtr, const LZ4F_decompressOptions_t* decompressOptionsPtr); +/* LZ4F_decompress() + * Call this function repetitively to regenerate data compressed within srcBuffer. + * The function will attempt to decode *srcSizePtr bytes from srcBuffer, into dstBuffer of maximum size *dstSizePtr. + * + * The number of bytes regenerated into dstBuffer will be provided within *dstSizePtr (necessarily <= original value). + * + * The number of bytes effectively used from srcBuffer will be provided within *srcSizePtr (necessarily <= original value). + * If the number of bytes read is < number of bytes provided, then the decompression operation is not complete. + * This typically happens when dstBuffer is not large enough to contain all decoded data. + * LZ4F_decompress() will have to be called again, starting from where it stopped (srcBuffer + *srcSizePtr) + * The function will check this condition, and refuse to continue if it is not respected. + * dstBuffer is supposed to be flushed between calls to the function, since its content will be rewritten. + * Different dst arguments can be used between each calls. + * + * The function result is an hint of the better srcSize to use for next call to LZ4F_decompress. + * Basically, it's the size of the current (or remaining) compressed block + header of next block. + * Respecting the hint provides some boost to performance, since it allows less buffer shuffling. + * Note that this is just a hint, you can always provide any srcSize you want. + * When a frame is fully decoded, the function result will be 0. + * If decompression failed, function result is an error code which can be tested using LZ4F_isError(). + */ + + + +#if defined (__cplusplus) +} +#endif diff --git a/lib/lz4hc.c b/lib/lz4hc.c new file mode 100644 index 0000000..89f0db0 --- /dev/null +++ b/lib/lz4hc.c @@ -0,0 +1,768 @@ +/* +LZ4 HC - High Compression Mode of LZ4 +Copyright (C) 2011-2014, Yann Collet. +BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + +* Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. +* Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +You can contact the author at : +- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html +- LZ4 source repository : http://code.google.com/p/lz4/ +*/ + + + +/************************************** + Tuning Parameter +**************************************/ +#define LZ4HC_DEFAULT_COMPRESSIONLEVEL 8 + + +/************************************** + Includes +**************************************/ +#include "lz4.h" +#include "lz4hc.h" + + +/************************************** + Local Compiler Options +**************************************/ +#if defined(__GNUC__) +# pragma GCC diagnostic ignored "-Wunused-function" +#endif + +#if defined (__clang__) +# pragma clang diagnostic ignored "-Wunused-function" +#endif + +#if defined(_MSC_VER) /* Visual Studio */ +# pragma warning(disable : 4201) /* disable: C4201: unnamed struct/union*/ +#endif + + +/************************************** + Common LZ4 definition +**************************************/ +#define LZ4_COMMONDEFS_ONLY +#include "lz4.c" + + +/************************************** + Local Constants +**************************************/ +#define DICTIONARY_LOGSIZE 16 +#define MAXD (1<<DICTIONARY_LOGSIZE) +#define MAXD_MASK ((U32)(MAXD - 1)) + +#define HASH_LOG (DICTIONARY_LOGSIZE-1) +#define HASHTABLESIZE (1 << HASH_LOG) +#define HASH_MASK (HASHTABLESIZE - 1) + +#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH) + + +/************************************** + Local Types +**************************************/ +typedef struct +{ + union { + U64 alignedOn8Bytes; /* force 8-bytes alignment on 32-bits systems */ + U32 hashTable[HASHTABLESIZE]; + }; + U16 chainTable[MAXD]; + const BYTE* end; /* next block here to continue on current prefix */ + const BYTE* base; /* All index relative to this position */ + const BYTE* dictBase; /* alternate base for extDict */ + U32 dictLimit; /* below that point, need extDict */ + U32 lowLimit; /* below that point, no more dict */ + U32 nextToUpdate; + U32 compressionLevel; + const BYTE* inputBuffer; /* deprecated */ +} LZ4HC_Data_Structure; + + +/************************************** + Local Macros +**************************************/ +#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG)) +#define DELTANEXT(p) chainTable[(size_t)(p) & MAXD_MASK] +#define GETNEXT(p) ((p) - (size_t)DELTANEXT(p)) + +static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); } + + + +/************************************** + HC Compression +**************************************/ +static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* base) +{ + MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable)); + MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable)); + hc4->nextToUpdate = 64 KB; + hc4->base = base - 64 KB; + hc4->inputBuffer = base; + hc4->end = base; + hc4->dictBase = base - 64 KB; + hc4->dictLimit = 64 KB; + hc4->lowLimit = 64 KB; +} + + +/* Update chains up to ip (excluded) */ +FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip) +{ + U16* chainTable = hc4->chainTable; + U32* HashTable = hc4->hashTable; + const BYTE* const base = hc4->base; + const U32 target = (U32)(ip - base); + U32 idx = hc4->nextToUpdate; + + while(idx < target) + { + U32 h = LZ4HC_hashPtr(base+idx); + size_t delta = idx - HashTable[h]; + if (delta>MAX_DISTANCE) delta = MAX_DISTANCE; + chainTable[idx & 0xFFFF] = (U16)delta; + HashTable[h] = idx; + idx++; + } + + hc4->nextToUpdate = target; +} + + +static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newBlock) +{ + if (ctxPtr->end >= ctxPtr->base + 4) + LZ4HC_Insert (ctxPtr, ctxPtr->end-3); // finish referencing dictionary content + // Note : need to handle risk of index overflow + // Use only one memory segment for dict, so any previous External Dict is lost at this stage + ctxPtr->lowLimit = ctxPtr->dictLimit; + ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base); + ctxPtr->dictBase = ctxPtr->base; + ctxPtr->base = newBlock - ctxPtr->dictLimit; + ctxPtr->end = newBlock; + ctxPtr->nextToUpdate = ctxPtr->dictLimit; // reference table must skip to from beginning of block +} + + +FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, // Index table will be updated + const BYTE* ip, const BYTE* const iLimit, + const BYTE** matchpos, + const int maxNbAttempts) +{ + U16* const chainTable = hc4->chainTable; + U32* const HashTable = hc4->hashTable; + const BYTE* const base = hc4->base; + const BYTE* const dictBase = hc4->dictBase; + const U32 dictLimit = hc4->dictLimit; + const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1); + U32 matchIndex; + const BYTE* match; + int nbAttempts=maxNbAttempts; + size_t ml=0; + + /* HC4 match finder */ + LZ4HC_Insert(hc4, ip); + matchIndex = HashTable[LZ4HC_hashPtr(ip)]; + + while ((matchIndex>=lowLimit) && (nbAttempts)) + { + nbAttempts--; + if (matchIndex >= dictLimit) + { + match = base + matchIndex; + if (*(match+ml) == *(ip+ml) + && (LZ4_read32(match) == LZ4_read32(ip))) + { + size_t mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, iLimit) + MINMATCH; + if (mlt > ml) { ml = mlt; *matchpos = match; } + } + } + else + { + match = dictBase + matchIndex; + if (LZ4_read32(match) == LZ4_read32(ip)) + { + size_t mlt; + const BYTE* vLimit = ip + (dictLimit - matchIndex); + if (vLimit > iLimit) vLimit = iLimit; + mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, vLimit) + MINMATCH; + if ((ip+mlt == vLimit) && (vLimit < iLimit)) + mlt += LZ4_count(ip+mlt, base+dictLimit, iLimit); + if (mlt > ml) { ml = mlt; *matchpos = base + matchIndex; } // virtual matchpos + } + } + matchIndex -= chainTable[matchIndex & 0xFFFF]; + } + + return (int)ml; +} + + +FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch ( + LZ4HC_Data_Structure* hc4, + const BYTE* ip, + const BYTE* iLowLimit, + const BYTE* iHighLimit, + int longest, + const BYTE** matchpos, + const BYTE** startpos, + const int maxNbAttempts) +{ + U16* const chainTable = hc4->chainTable; + U32* const HashTable = hc4->hashTable; + const BYTE* const base = hc4->base; + const U32 dictLimit = hc4->dictLimit; + const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1); + const BYTE* const dictBase = hc4->dictBase; + const BYTE* match; + U32 matchIndex; + int nbAttempts = maxNbAttempts; + int delta = (int)(ip-iLowLimit); + + + /* First Match */ + LZ4HC_Insert(hc4, ip); + matchIndex = HashTable[LZ4HC_hashPtr(ip)]; + + while ((matchIndex>=lowLimit) && (nbAttempts)) + { + nbAttempts--; + if (matchIndex >= dictLimit) + { + match = base + matchIndex; + if (*(iLowLimit + longest) == *(match - delta + longest)) + if (LZ4_read32(match) == LZ4_read32(ip)) + { + const BYTE* startt = ip; + const BYTE* tmpMatch = match; + const BYTE* const matchEnd = ip + MINMATCH + LZ4_count(ip+MINMATCH, match+MINMATCH, iHighLimit); + + while ((startt>iLowLimit) && (tmpMatch > iLowLimit) && (startt[-1] == tmpMatch[-1])) {startt--; tmpMatch--;} + + if ((matchEnd-startt) > longest) + { + longest = (int)(matchEnd-startt); + *matchpos = tmpMatch; + *startpos = startt; + } + } + } + else + { + match = dictBase + matchIndex; + if (LZ4_read32(match) == LZ4_read32(ip)) + { + size_t mlt; + int back=0; + const BYTE* vLimit = ip + (dictLimit - matchIndex); + if (vLimit > iHighLimit) vLimit = iHighLimit; + mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, vLimit) + MINMATCH; + if ((ip+mlt == vLimit) && (vLimit < iHighLimit)) + mlt += LZ4_count(ip+mlt, base+dictLimit, iHighLimit); + while ((ip+back > iLowLimit) && (matchIndex+back > lowLimit) && (ip[back-1] == match[back-1])) back--; + mlt -= back; + if ((int)mlt > longest) { longest = (int)mlt; *matchpos = base + matchIndex + back; *startpos = ip+back; } + } + } + matchIndex -= chainTable[matchIndex & 0xFFFF]; + } + + return longest; +} + + +typedef enum { noLimit = 0, limitedOutput = 1 } limitedOutput_directive; + +//static unsigned debug = 0; + +FORCE_INLINE int LZ4HC_encodeSequence ( + const BYTE** ip, + BYTE** op, + const BYTE** anchor, + int matchLength, + const BYTE* const match, + limitedOutput_directive limitedOutputBuffer, + BYTE* oend) +{ + int length; + BYTE* token; + + //if (debug) printf("literal : %u -- match : %u -- offset : %u\n", (U32)(*ip - *anchor), (U32)matchLength, (U32)(*ip-match)); // debug + + /* Encode Literal length */ + length = (int)(*ip - *anchor); + token = (*op)++; + if ((limitedOutputBuffer) && ((*op + (length>>8) + length + (2 + 1 + LASTLITERALS)) > oend)) return 1; /* Check output limit */ + if (length>=(int)RUN_MASK) { int len; *token=(RUN_MASK<<ML_BITS); len = length-RUN_MASK; for(; len > 254 ; len-=255) *(*op)++ = 255; *(*op)++ = (BYTE)len; } + else *token = (BYTE)(length<<ML_BITS); + + /* Copy Literals */ + LZ4_wildCopy(*op, *anchor, (*op) + length); + *op += length; + + /* Encode Offset */ + LZ4_writeLE16(*op, (U16)(*ip-match)); *op += 2; + + /* Encode MatchLength */ + length = (int)(matchLength-MINMATCH); + if ((limitedOutputBuffer) && (*op + (length>>8) + (1 + LASTLITERALS) > oend)) return 1; /* Check output limit */ + if (length>=(int)ML_MASK) { *token+=ML_MASK; length-=ML_MASK; for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (length > 254) { length-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)length; } + else *token += (BYTE)(length); + + /* Prepare next loop */ + *ip += matchLength; + *anchor = *ip; + + return 0; +} + + +#define MAX_COMPRESSION_LEVEL 16 +static int LZ4HC_compress_generic ( + void* ctxvoid, + const char* source, + char* dest, + int inputSize, + int maxOutputSize, + int compressionLevel, + limitedOutput_directive limit + ) +{ + LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid; + const BYTE* ip = (const BYTE*) source; + const BYTE* anchor = ip; + const BYTE* const iend = ip + inputSize; + const BYTE* const mflimit = iend - MFLIMIT; + const BYTE* const matchlimit = (iend - LASTLITERALS); + + BYTE* op = (BYTE*) dest; + BYTE* const oend = op + maxOutputSize; + + unsigned maxNbAttempts; + int ml, ml2, ml3, ml0; + const BYTE* ref=NULL; + const BYTE* start2=NULL; + const BYTE* ref2=NULL; + const BYTE* start3=NULL; + const BYTE* ref3=NULL; + const BYTE* start0; + const BYTE* ref0; + + + /* init */ + if (compressionLevel > MAX_COMPRESSION_LEVEL) compressionLevel = MAX_COMPRESSION_LEVEL; + if (compressionLevel == 0) compressionLevel = LZ4HC_DEFAULT_COMPRESSIONLEVEL; + maxNbAttempts = 1 << compressionLevel; + ctx->end += inputSize; + + ip++; + + /* Main Loop */ + while (ip < mflimit) + { + ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref), maxNbAttempts); + if (!ml) { ip++; continue; } + + /* saved, in case we would skip too much */ + start0 = ip; + ref0 = ref; + ml0 = ml; + +_Search2: + if (ip+ml < mflimit) + ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2, maxNbAttempts); + else ml2 = ml; + + if (ml2 == ml) /* No better match */ + { + if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0; + continue; + } + + if (start0 < ip) + { + if (start2 < ip + ml0) /* empirical */ + { + ip = start0; + ref = ref0; + ml = ml0; + } + } + + /* Here, start0==ip */ + if ((start2 - ip) < 3) /* First Match too small : removed */ + { + ml = ml2; + ip = start2; + ref =ref2; + goto _Search2; + } + +_Search3: + /* + * Currently we have : + * ml2 > ml1, and + * ip1+3 <= ip2 (usually < ip1+ml1) + */ + if ((start2 - ip) < OPTIMAL_ML) + { + int correction; + int new_ml = ml; + if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML; + if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = (int)(start2 - ip) + ml2 - MINMATCH; + correction = new_ml - (int)(start2 - ip); + if (correction > 0) + { + start2 += correction; + ref2 += correction; + ml2 -= correction; + } + } + /* Now, we have start2 = ip+new_ml, with new_ml = min(ml, OPTIMAL_ML=18) */ + + if (start2 + ml2 < mflimit) + ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts); + else ml3 = ml2; + + if (ml3 == ml2) /* No better match : 2 sequences to encode */ + { + /* ip & ref are known; Now for ml */ + if (start2 < ip+ml) ml = (int)(start2 - ip); + /* Now, encode 2 sequences */ + if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0; + ip = start2; + if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml2, ref2, limit, oend)) return 0; + continue; + } + + if (start3 < ip+ml+3) /* Not enough space for match 2 : remove it */ + { + if (start3 >= (ip+ml)) /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */ + { + if (start2 < ip+ml) + { + int correction = (int)(ip+ml - start2); + start2 += correction; + ref2 += correction; + ml2 -= correction; + if (ml2 < MINMATCH) + { + start2 = start3; + ref2 = ref3; + ml2 = ml3; + } + } + + if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0; + ip = start3; + ref = ref3; + ml = ml3; + + start0 = start2; + ref0 = ref2; + ml0 = ml2; + goto _Search2; + } + + start2 = start3; + ref2 = ref3; + ml2 = ml3; + goto _Search3; + } + + /* + * OK, now we have 3 ascending matches; let's write at least the first one + * ip & ref are known; Now for ml + */ + if (start2 < ip+ml) + { + if ((start2 - ip) < (int)ML_MASK) + { + int correction; + if (ml > OPTIMAL_ML) ml = OPTIMAL_ML; + if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH; + correction = ml - (int)(start2 - ip); + if (correction > 0) + { + start2 += correction; + ref2 += correction; + ml2 -= correction; + } + } + else + { + ml = (int)(start2 - ip); + } + } + if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0; + + ip = start2; + ref = ref2; + ml = ml2; + + start2 = start3; + ref2 = ref3; + ml2 = ml3; + + goto _Search3; + } + + /* Encode Last Literals */ + { + int lastRun = (int)(iend - anchor); + if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; /* Check output limit */ + if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; } + else *op++ = (BYTE)(lastRun<<ML_BITS); + memcpy(op, anchor, iend - anchor); + op += iend-anchor; + } + + /* End */ + return (int) (((char*)op)-dest); +} + + +int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel) +{ + LZ4HC_Data_Structure ctx; + LZ4HC_init(&ctx, (const BYTE*)source); + return LZ4HC_compress_generic (&ctx, source, dest, inputSize, 0, compressionLevel, noLimit); +} + +int LZ4_compressHC(const char* source, char* dest, int inputSize) { return LZ4_compressHC2(source, dest, inputSize, 0); } + +int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel) +{ + LZ4HC_Data_Structure ctx; + LZ4HC_init(&ctx, (const BYTE*)source); + return LZ4HC_compress_generic (&ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput); +} + +int LZ4_compressHC_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_compressHC2_limitedOutput(source, dest, inputSize, maxOutputSize, 0); +} + + +/***************************** + Using external allocation +*****************************/ +int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); } + + +int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel) +{ + if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */ + LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)source); + return LZ4HC_compress_generic (state, source, dest, inputSize, 0, compressionLevel, noLimit); +} + +int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize) +{ return LZ4_compressHC2_withStateHC (state, source, dest, inputSize, 0); } + + +int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel) +{ + if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */ + LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)source); + return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput); +} + +int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize) +{ return LZ4_compressHC2_limitedOutput_withStateHC (state, source, dest, inputSize, maxOutputSize, 0); } + + +/************************************** + Experimental Streaming Functions +**************************************/ +/* allocation */ +LZ4_streamHC_t* LZ4_createStreamHC(void) { return (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t)); } +int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }; + + +/* initialization */ +void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel) +{ + LZ4_STATIC_ASSERT(sizeof(LZ4HC_Data_Structure) <= LZ4_STREAMHCSIZE); /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */ + ((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->base = NULL; + ((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->compressionLevel = (unsigned)compressionLevel; +} + +int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize) +{ + LZ4HC_Data_Structure* streamPtr = (LZ4HC_Data_Structure*) LZ4_streamHCPtr; + if (dictSize > 64 KB) + { + dictionary += dictSize - 64 KB; + dictSize = 64 KB; + } + LZ4HC_init (streamPtr, (const BYTE*)dictionary); + if (dictSize >= 4) LZ4HC_Insert (streamPtr, (const BYTE*)dictionary +(dictSize-3)); + streamPtr->end = (const BYTE*)dictionary + dictSize; + return dictSize; +} + + +/* compression */ + +static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* dsPtr, + const char* source, char* dest, + int inputSize, int maxOutputSize, limitedOutput_directive limit) +{ + /* auto-init if forgotten */ + if (dsPtr->base == NULL) + LZ4HC_init (dsPtr, (const BYTE*) source); + + /* Check overflow */ + if ((size_t)(dsPtr->end - dsPtr->base) > 2 GB) + { + size_t dictSize = (size_t)(dsPtr->end - dsPtr->base) - dsPtr->dictLimit; + if (dictSize > 64 KB) dictSize = 64 KB; + + LZ4_loadDictHC((LZ4_streamHC_t*)dsPtr, (const char*)(dsPtr->end) - dictSize, (int)dictSize); + } + + /* Check if blocks follow each other */ + if ((const BYTE*)source != dsPtr->end) LZ4HC_setExternalDict(dsPtr, (const BYTE*)source); + + /* Check overlapping input/dictionary space */ + { + const BYTE* sourceEnd = (const BYTE*) source + inputSize; + const BYTE* dictBegin = dsPtr->dictBase + dsPtr->lowLimit; + const BYTE* dictEnd = dsPtr->dictBase + dsPtr->dictLimit; + if ((sourceEnd > dictBegin) && ((BYTE*)source < dictEnd)) + { + if (sourceEnd > dictEnd) sourceEnd = dictEnd; + dsPtr->lowLimit = (U32)(sourceEnd - dsPtr->dictBase); + if (dsPtr->dictLimit - dsPtr->lowLimit < 4) dsPtr->lowLimit = dsPtr->dictLimit; + } + } + + return LZ4HC_compress_generic (dsPtr, source, dest, inputSize, maxOutputSize, dsPtr->compressionLevel, limit); +} + +int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize) +{ + return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, 0, noLimit); +} + +int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput); +} + + +/* dictionary saving */ + +int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictSize) +{ + LZ4HC_Data_Structure* streamPtr = (LZ4HC_Data_Structure*)LZ4_streamHCPtr; + int prefixSize = (int)(streamPtr->end - (streamPtr->base + streamPtr->dictLimit)); + if (dictSize > 64 KB) dictSize = 64 KB; + if (dictSize < 4) dictSize = 0; + if (dictSize > prefixSize) dictSize = prefixSize; + memcpy(safeBuffer, streamPtr->end - dictSize, dictSize); + //LZ4_loadDictHC(LZ4_streamHCPtr, safeBuffer, dictSize); + { + U32 endIndex = (U32)(streamPtr->end - streamPtr->base); + streamPtr->end = (const BYTE*)safeBuffer + dictSize; + streamPtr->base = streamPtr->end - endIndex; + streamPtr->dictLimit = endIndex - dictSize; + streamPtr->lowLimit = endIndex - dictSize; + } + return dictSize; +} + + +/*********************************** + * Deprecated Functions + ***********************************/ +int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; } + +int LZ4_resetStreamStateHC(void* state, const char* inputBuffer) +{ + if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1; /* Error : pointer is not aligned for pointer (32 or 64 bits) */ + LZ4HC_init((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer); + return 0; +} + +void* LZ4_createHC (const char* inputBuffer) +{ + void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure)); + LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer); + return hc4; +} + +int LZ4_freeHC (void* LZ4HC_Data) +{ + FREEMEM(LZ4HC_Data); + return (0); +} + +/* +int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize) +{ +return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, 0, noLimit); +} +int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize) +{ +return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, 0, limitedOutput); +} +*/ + +int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel) +{ + return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, compressionLevel, noLimit); +} + +int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel) +{ + return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput); +} + +char* LZ4_slideInputBufferHC(void* LZ4HC_Data) +{ + LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data; + size_t distance = (hc4->end - 64 KB) - hc4->inputBuffer; + + if (hc4->end <= hc4->inputBuffer + 64 KB) return (char*)(hc4->end); /* no update : less than 64KB within buffer */ + + distance = (distance >> 16) << 16; /* Must be a multiple of 64 KB */ + LZ4HC_Insert(hc4, hc4->end - MINMATCH); + memcpy((void*)(hc4->end - 64 KB - distance), (const void*)(hc4->end - 64 KB), 64 KB); + hc4->base -= distance; + if ((U32)(hc4->inputBuffer - hc4->base) > 1 GB + 64 KB) /* Avoid overflow */ + { + int i; + hc4->base += 1 GB; + for (i=0; i<HASHTABLESIZE; i++) hc4->hashTable[i] -= 1 GB; + } + hc4->end -= distance; + return (char*)(hc4->end); +} diff --git a/lib/lz4hc.h b/lib/lz4hc.h new file mode 100644 index 0000000..26ba6d3 --- /dev/null +++ b/lib/lz4hc.h @@ -0,0 +1,223 @@ +/* + LZ4 HC - High Compression Mode of LZ4 + Header File + Copyright (C) 2011-2014, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html + - LZ4 source repository : http://code.google.com/p/lz4/ +*/ +#pragma once + + +#if defined (__cplusplus) +extern "C" { +#endif + + +int LZ4_compressHC (const char* source, char* dest, int inputSize); +/* +LZ4_compressHC : + return : the number of bytes in compressed buffer dest + or 0 if compression fails. + note : destination buffer must be already allocated. + To avoid any problem, size it to handle worst cases situations (input data not compressible) + Worst case size evaluation is provided by function LZ4_compressBound() (see "lz4.h") +*/ + +int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize); +/* +LZ4_compress_limitedOutput() : + Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'. + If it cannot achieve it, compression will stop, and result of the function will be zero. + This function never writes outside of provided output buffer. + + inputSize : Max supported value is 1 GB + maxOutputSize : is maximum allowed size into the destination buffer (which must be already allocated) + return : the number of output bytes written in buffer 'dest' + or 0 if compression fails. +*/ + + +int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel); +int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel); +/* + Same functions as above, but with programmable 'compressionLevel'. + Recommended values are between 4 and 9, although any value between 0 and 16 will work. + 'compressionLevel'==0 means use default 'compressionLevel' value. + Values above 16 behave the same as 16. + Equivalent variants exist for all other compression functions below. +*/ + +/* Note : + Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license) +*/ + + +/************************************** + Using an external allocation +**************************************/ +int LZ4_sizeofStateHC(void); +int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize); +int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize); + +int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel); +int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel); + +/* +These functions are provided should you prefer to allocate memory for compression tables with your own allocation methods. +To know how much memory must be allocated for the compression tables, use : +int LZ4_sizeofStateHC(); + +Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0). + +The allocated memory can be provided to the compression functions using 'void* state' parameter. +LZ4_compress_withStateHC() and LZ4_compress_limitedOutput_withStateHC() are equivalent to previously described functions. +They just use the externally allocated memory for state instead of allocating their own (on stack, or on heap). +*/ + + + +/************************************** + Experimental Streaming Functions +**************************************/ +#define LZ4_STREAMHCSIZE_U64 32774 +#define LZ4_STREAMHCSIZE (LZ4_STREAMHCSIZE_U64 * sizeof(unsigned long long)) +typedef struct { unsigned long long table[LZ4_STREAMHCSIZE_U64]; } LZ4_streamHC_t; + +/* +This structure allows static allocation of LZ4 HC streaming state. +State must then be initialized using LZ4_resetStreamHC() before first use. + +If you prefer dynamic allocation, please refer to functions below. +*/ + +LZ4_streamHC_t* LZ4_createStreamHC(void); +int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr); + +/* +These functions create and release memory for LZ4 HC streaming state. +Newly created states are already initialized. +Existing state space can be re-used anytime using LZ4_resetStreamHC(). +*/ + +void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel); +int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize); + +int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize); +int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize); + +int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int maxDictSize); + +/* +These functions compress data in successive blocks of any size, using previous blocks as dictionary. +One key assumption is that each previous block will remain read-accessible while compressing next block. + +Before starting compression, state must be properly initialized, using LZ4_resetStreamHC(). +A first "fictional block" can then be designated as initial dictionary, using LZ4_loadDictHC() (Optional). + +Then, use LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue() to compress each successive block. +They work like usual LZ4_compressHC() or LZ4_compressHC_limitedOutput(), but use previous memory blocks to improve compression. +Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression. + +If, for any reason, previous data block can't be preserved in memory during next compression block, +you must save it to a safer memory space, +using LZ4_saveDictHC(). +*/ + + + +/************************************** + Deprecated Streaming Functions +**************************************/ +/* Note : these streaming functions still follows the older model */ +void* LZ4_createHC (const char* inputBuffer); +//int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize); +//int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize); +char* LZ4_slideInputBufferHC (void* LZ4HC_Data); +int LZ4_freeHC (void* LZ4HC_Data); + +int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel); +int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel); + +/* +These functions allow the compression of dependent blocks, where each block benefits from prior 64 KB within preceding blocks. +In order to achieve this, it is necessary to start creating the LZ4HC Data Structure, thanks to the function : + +void* LZ4_createHC (const char* inputBuffer); +The result of the function is the (void*) pointer on the LZ4HC Data Structure. +This pointer will be needed in all other functions. +If the pointer returned is NULL, then the allocation has failed, and compression must be aborted. +The only parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer. +The input buffer must be already allocated, and size at least 192KB. +'inputBuffer' will also be the 'const char* source' of the first block. + +All blocks are expected to lay next to each other within the input buffer, starting from 'inputBuffer'. +To compress each block, use either LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(). +Their behavior are identical to LZ4_compressHC() or LZ4_compressHC_limitedOutput(), +but require the LZ4HC Data Structure as their first argument, and check that each block starts right after the previous one. +If next block does not begin immediately after the previous one, the compression will fail (return 0). + +When it's no longer possible to lay the next block after the previous one (not enough space left into input buffer), a call to : +char* LZ4_slideInputBufferHC(void* LZ4HC_Data); +must be performed. It will typically copy the latest 64KB of input at the beginning of input buffer. +Note that, for this function to work properly, minimum size of an input buffer must be 192KB. +==> The memory position where the next input data block must start is provided as the result of the function. + +Compression can then resume, using LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(), as usual. + +When compression is completed, a call to LZ4_freeHC() will release the memory used by the LZ4HC Data Structure. +*/ + +int LZ4_sizeofStreamStateHC(void); +int LZ4_resetStreamStateHC(void* state, const char* inputBuffer); + +/* +These functions achieve the same result as : +void* LZ4_createHC (const char* inputBuffer); + +They are provided here to allow the user program to allocate memory using its own routines. + +To know how much space must be allocated, use LZ4_sizeofStreamStateHC(); +Note also that space must be aligned for pointers (32 or 64 bits). + +Once space is allocated, you must initialize it using : LZ4_resetStreamStateHC(void* state, const char* inputBuffer); +void* state is a pointer to the space allocated. +It must be aligned for pointers (32 or 64 bits), and be large enough. +The parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer. +The input buffer must be already allocated, and size at least 192KB. +'inputBuffer' will also be the 'const char* source' of the first block. + +The same space can be re-used multiple times, just by initializing it each time with LZ4_resetStreamState(). +return value of LZ4_resetStreamStateHC() must be 0 is OK. +Any other value means there was an error (typically, state is not aligned for pointers (32 or 64 bits)). +*/ + + +#if defined (__cplusplus) +} +#endif diff --git a/lib/lz4hc.o b/lib/lz4hc.o Binary files differnew file mode 100644 index 0000000..bbc0911 --- /dev/null +++ b/lib/lz4hc.o diff --git a/lib/xxhash.c b/lib/xxhash.c new file mode 100644 index 0000000..24a64b5 --- /dev/null +++ b/lib/xxhash.c @@ -0,0 +1,928 @@ +/* +xxHash - Fast Hash algorithm +Copyright (C) 2012-2014, Yann Collet. +BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + +* Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. +* Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +You can contact the author at : +- xxHash source repository : http://code.google.com/p/xxhash/ +- public discussion board : https://groups.google.com/forum/#!forum/lz4c +*/ + + +//************************************** +// Tuning parameters +//************************************** +// Unaligned memory access is automatically enabled for "common" CPU, such as x86. +// For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected. +// If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance. +// You can also enable this parameter if you know your input data will always be aligned (boundaries of 4, for U32). +#if defined(__ARM_FEATURE_UNALIGNED) || defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64) +# define XXH_USE_UNALIGNED_ACCESS 1 +#endif + +// XXH_ACCEPT_NULL_INPUT_POINTER : +// If the input pointer is a null pointer, xxHash default behavior is to trigger a memory access error, since it is a bad pointer. +// When this option is enabled, xxHash output for null input pointers will be the same as a null-length input. +// This option has a very small performance cost (only measurable on small inputs). +// By default, this option is disabled. To enable it, uncomment below define : +// #define XXH_ACCEPT_NULL_INPUT_POINTER 1 + +// XXH_FORCE_NATIVE_FORMAT : +// By default, xxHash library provides endian-independant Hash values, based on little-endian convention. +// Results are therefore identical for little-endian and big-endian CPU. +// This comes at a performance cost for big-endian CPU, since some swapping is required to emulate little-endian format. +// Should endian-independance be of no importance for your application, you may set the #define below to 1. +// It will improve speed for Big-endian CPU. +// This option has no impact on Little_Endian CPU. +#define XXH_FORCE_NATIVE_FORMAT 0 + +//************************************** +// Compiler Specific Options +//************************************** +// Disable some Visual warning messages +#ifdef _MSC_VER // Visual Studio +# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant +#endif + +#ifdef _MSC_VER // Visual Studio +# define FORCE_INLINE static __forceinline +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + +//************************************** +// Includes & Memory related functions +//************************************** +#include "xxhash.h" +// Modify the local functions below should you wish to use some other memory routines +// for malloc(), free() +#include <stdlib.h> +static void* XXH_malloc(size_t s) { return malloc(s); } +static void XXH_free (void* p) { free(p); } +// for memcpy() +#include <string.h> +static void* XXH_memcpy(void* dest, const void* src, size_t size) +{ + return memcpy(dest,src,size); +} + + +//************************************** +// Basic Types +//************************************** +#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L // C99 +# include <stdint.h> +typedef uint8_t BYTE; +typedef uint16_t U16; +typedef uint32_t U32; +typedef int32_t S32; +typedef uint64_t U64; +#else +typedef unsigned char BYTE; +typedef unsigned short U16; +typedef unsigned int U32; +typedef signed int S32; +typedef unsigned long long U64; +#endif + +#if defined(__GNUC__) && !defined(XXH_USE_UNALIGNED_ACCESS) +# define _PACKED __attribute__ ((packed)) +#else +# define _PACKED +#endif + +#if !defined(XXH_USE_UNALIGNED_ACCESS) && !defined(__GNUC__) +# ifdef __IBMC__ +# pragma pack(1) +# else +# pragma pack(push, 1) +# endif +#endif + +typedef struct _U32_S +{ + U32 v; +} _PACKED U32_S; +typedef struct _U64_S +{ + U64 v; +} _PACKED U64_S; + +#if !defined(XXH_USE_UNALIGNED_ACCESS) && !defined(__GNUC__) +# pragma pack(pop) +#endif + +#define A32(x) (((U32_S *)(x))->v) +#define A64(x) (((U64_S *)(x))->v) + + +//*************************************** +// Compiler-specific Functions and Macros +//*************************************** +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) + +// Note : although _rotl exists for minGW (GCC under windows), performance seems poor +#if defined(_MSC_VER) +# define XXH_rotl32(x,r) _rotl(x,r) +# define XXH_rotl64(x,r) _rotl64(x,r) +#else +# define XXH_rotl32(x,r) ((x << r) | (x >> (32 - r))) +# define XXH_rotl64(x,r) ((x << r) | (x >> (64 - r))) +#endif + +#if defined(_MSC_VER) // Visual Studio +# define XXH_swap32 _byteswap_ulong +# define XXH_swap64 _byteswap_uint64 +#elif GCC_VERSION >= 403 +# define XXH_swap32 __builtin_bswap32 +# define XXH_swap64 __builtin_bswap64 +#else +static inline U32 XXH_swap32 (U32 x) +{ + return ((x << 24) & 0xff000000 ) | + ((x << 8) & 0x00ff0000 ) | + ((x >> 8) & 0x0000ff00 ) | + ((x >> 24) & 0x000000ff ); +} +static inline U64 XXH_swap64 (U64 x) +{ + return ((x << 56) & 0xff00000000000000ULL) | + ((x << 40) & 0x00ff000000000000ULL) | + ((x << 24) & 0x0000ff0000000000ULL) | + ((x << 8) & 0x000000ff00000000ULL) | + ((x >> 8) & 0x00000000ff000000ULL) | + ((x >> 24) & 0x0000000000ff0000ULL) | + ((x >> 40) & 0x000000000000ff00ULL) | + ((x >> 56) & 0x00000000000000ffULL); +} +#endif + + +//************************************** +// Constants +//************************************** +#define PRIME32_1 2654435761U +#define PRIME32_2 2246822519U +#define PRIME32_3 3266489917U +#define PRIME32_4 668265263U +#define PRIME32_5 374761393U + +#define PRIME64_1 11400714785074694791ULL +#define PRIME64_2 14029467366897019727ULL +#define PRIME64_3 1609587929392839161ULL +#define PRIME64_4 9650029242287828579ULL +#define PRIME64_5 2870177450012600261ULL + +//************************************** +// Architecture Macros +//************************************** +typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianess; +#ifndef XXH_CPU_LITTLE_ENDIAN // It is possible to define XXH_CPU_LITTLE_ENDIAN externally, for example using a compiler switch +static const int one = 1; +# define XXH_CPU_LITTLE_ENDIAN (*(char*)(&one)) +#endif + + +//************************************** +// Macros +//************************************** +#define XXH_STATIC_ASSERT(c) { enum { XXH_static_assert = 1/(!!(c)) }; } // use only *after* variable declarations + + +//**************************** +// Memory reads +//**************************** +typedef enum { XXH_aligned, XXH_unaligned } XXH_alignment; + +FORCE_INLINE U32 XXH_readLE32_align(const void* ptr, XXH_endianess endian, XXH_alignment align) +{ + if (align==XXH_unaligned) + return endian==XXH_littleEndian ? A32(ptr) : XXH_swap32(A32(ptr)); + else + return endian==XXH_littleEndian ? *(U32*)ptr : XXH_swap32(*(U32*)ptr); +} + +FORCE_INLINE U32 XXH_readLE32(const void* ptr, XXH_endianess endian) +{ + return XXH_readLE32_align(ptr, endian, XXH_unaligned); +} + +FORCE_INLINE U64 XXH_readLE64_align(const void* ptr, XXH_endianess endian, XXH_alignment align) +{ + if (align==XXH_unaligned) + return endian==XXH_littleEndian ? A64(ptr) : XXH_swap64(A64(ptr)); + else + return endian==XXH_littleEndian ? *(U64*)ptr : XXH_swap64(*(U64*)ptr); +} + +FORCE_INLINE U64 XXH_readLE64(const void* ptr, XXH_endianess endian) +{ + return XXH_readLE64_align(ptr, endian, XXH_unaligned); +} + + +//**************************** +// Simple Hash Functions +//**************************** +FORCE_INLINE U32 XXH32_endian_align(const void* input, size_t len, U32 seed, XXH_endianess endian, XXH_alignment align) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* bEnd = p + len; + U32 h32; +#define XXH_get32bits(p) XXH_readLE32_align(p, endian, align) + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (p==NULL) + { + len=0; + bEnd=p=(const BYTE*)(size_t)16; + } +#endif + + if (len>=16) + { + const BYTE* const limit = bEnd - 16; + U32 v1 = seed + PRIME32_1 + PRIME32_2; + U32 v2 = seed + PRIME32_2; + U32 v3 = seed + 0; + U32 v4 = seed - PRIME32_1; + + do + { + v1 += XXH_get32bits(p) * PRIME32_2; + v1 = XXH_rotl32(v1, 13); + v1 *= PRIME32_1; + p+=4; + v2 += XXH_get32bits(p) * PRIME32_2; + v2 = XXH_rotl32(v2, 13); + v2 *= PRIME32_1; + p+=4; + v3 += XXH_get32bits(p) * PRIME32_2; + v3 = XXH_rotl32(v3, 13); + v3 *= PRIME32_1; + p+=4; + v4 += XXH_get32bits(p) * PRIME32_2; + v4 = XXH_rotl32(v4, 13); + v4 *= PRIME32_1; + p+=4; + } + while (p<=limit); + + h32 = XXH_rotl32(v1, 1) + XXH_rotl32(v2, 7) + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18); + } + else + { + h32 = seed + PRIME32_5; + } + + h32 += (U32) len; + + while (p+4<=bEnd) + { + h32 += XXH_get32bits(p) * PRIME32_3; + h32 = XXH_rotl32(h32, 17) * PRIME32_4 ; + p+=4; + } + + while (p<bEnd) + { + h32 += (*p) * PRIME32_5; + h32 = XXH_rotl32(h32, 11) * PRIME32_1 ; + p++; + } + + h32 ^= h32 >> 15; + h32 *= PRIME32_2; + h32 ^= h32 >> 13; + h32 *= PRIME32_3; + h32 ^= h32 >> 16; + + return h32; +} + + +unsigned int XXH32 (const void* input, size_t len, unsigned seed) +{ +#if 0 + // Simple version, good for code maintenance, but unfortunately slow for small inputs + XXH32_state_t state; + XXH32_reset(&state, seed); + XXH32_update(&state, input, len); + return XXH32_digest(&state); +#else + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + +# if !defined(XXH_USE_UNALIGNED_ACCESS) + if ((((size_t)input) & 3) == 0) // Input is aligned, let's leverage the speed advantage + { + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned); + else + return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned); + } +# endif + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned); + else + return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned); +#endif +} + +FORCE_INLINE U64 XXH64_endian_align(const void* input, size_t len, U64 seed, XXH_endianess endian, XXH_alignment align) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* bEnd = p + len; + U64 h64; +#define XXH_get64bits(p) XXH_readLE64_align(p, endian, align) + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (p==NULL) + { + len=0; + bEnd=p=(const BYTE*)(size_t)32; + } +#endif + + if (len>=32) + { + const BYTE* const limit = bEnd - 32; + U64 v1 = seed + PRIME64_1 + PRIME64_2; + U64 v2 = seed + PRIME64_2; + U64 v3 = seed + 0; + U64 v4 = seed - PRIME64_1; + + do + { + v1 += XXH_get64bits(p) * PRIME64_2; + p+=8; + v1 = XXH_rotl64(v1, 31); + v1 *= PRIME64_1; + v2 += XXH_get64bits(p) * PRIME64_2; + p+=8; + v2 = XXH_rotl64(v2, 31); + v2 *= PRIME64_1; + v3 += XXH_get64bits(p) * PRIME64_2; + p+=8; + v3 = XXH_rotl64(v3, 31); + v3 *= PRIME64_1; + v4 += XXH_get64bits(p) * PRIME64_2; + p+=8; + v4 = XXH_rotl64(v4, 31); + v4 *= PRIME64_1; + } + while (p<=limit); + + h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18); + + v1 *= PRIME64_2; + v1 = XXH_rotl64(v1, 31); + v1 *= PRIME64_1; + h64 ^= v1; + h64 = h64 * PRIME64_1 + PRIME64_4; + + v2 *= PRIME64_2; + v2 = XXH_rotl64(v2, 31); + v2 *= PRIME64_1; + h64 ^= v2; + h64 = h64 * PRIME64_1 + PRIME64_4; + + v3 *= PRIME64_2; + v3 = XXH_rotl64(v3, 31); + v3 *= PRIME64_1; + h64 ^= v3; + h64 = h64 * PRIME64_1 + PRIME64_4; + + v4 *= PRIME64_2; + v4 = XXH_rotl64(v4, 31); + v4 *= PRIME64_1; + h64 ^= v4; + h64 = h64 * PRIME64_1 + PRIME64_4; + } + else + { + h64 = seed + PRIME64_5; + } + + h64 += (U64) len; + + while (p+8<=bEnd) + { + U64 k1 = XXH_get64bits(p); + k1 *= PRIME64_2; + k1 = XXH_rotl64(k1,31); + k1 *= PRIME64_1; + h64 ^= k1; + h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; + p+=8; + } + + if (p+4<=bEnd) + { + h64 ^= (U64)(XXH_get32bits(p)) * PRIME64_1; + h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3; + p+=4; + } + + while (p<bEnd) + { + h64 ^= (*p) * PRIME64_5; + h64 = XXH_rotl64(h64, 11) * PRIME64_1; + p++; + } + + h64 ^= h64 >> 33; + h64 *= PRIME64_2; + h64 ^= h64 >> 29; + h64 *= PRIME64_3; + h64 ^= h64 >> 32; + + return h64; +} + + +unsigned long long XXH64 (const void* input, size_t len, unsigned long long seed) +{ +#if 0 + // Simple version, good for code maintenance, but unfortunately slow for small inputs + XXH64_state_t state; + XXH64_reset(&state, seed); + XXH64_update(&state, input, len); + return XXH64_digest(&state); +#else + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + +# if !defined(XXH_USE_UNALIGNED_ACCESS) + if ((((size_t)input) & 7)==0) // Input is aligned, let's leverage the speed advantage + { + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned); + else + return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned); + } +# endif + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned); + else + return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned); +#endif +} + +/**************************************************** + * Advanced Hash Functions +****************************************************/ + +/*** Allocation ***/ +typedef struct +{ + U64 total_len; + U32 seed; + U32 v1; + U32 v2; + U32 v3; + U32 v4; + U32 mem32[4]; /* defined as U32 for alignment */ + U32 memsize; +} XXH_istate32_t; + +typedef struct +{ + U64 total_len; + U64 seed; + U64 v1; + U64 v2; + U64 v3; + U64 v4; + U64 mem64[4]; /* defined as U64 for alignment */ + U32 memsize; +} XXH_istate64_t; + + +XXH32_state_t* XXH32_createState(void) +{ + XXH_STATIC_ASSERT(sizeof(XXH32_state_t) >= sizeof(XXH_istate32_t)); // A compilation error here means XXH32_state_t is not large enough + return (XXH32_state_t*)XXH_malloc(sizeof(XXH32_state_t)); +} +XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr) +{ + XXH_free(statePtr); + return XXH_OK; +}; + +XXH64_state_t* XXH64_createState(void) +{ + XXH_STATIC_ASSERT(sizeof(XXH64_state_t) >= sizeof(XXH_istate64_t)); // A compilation error here means XXH64_state_t is not large enough + return (XXH64_state_t*)XXH_malloc(sizeof(XXH64_state_t)); +} +XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr) +{ + XXH_free(statePtr); + return XXH_OK; +}; + + +/*** Hash feed ***/ + +XXH_errorcode XXH32_reset(XXH32_state_t* state_in, U32 seed) +{ + XXH_istate32_t* state = (XXH_istate32_t*) state_in; + state->seed = seed; + state->v1 = seed + PRIME32_1 + PRIME32_2; + state->v2 = seed + PRIME32_2; + state->v3 = seed + 0; + state->v4 = seed - PRIME32_1; + state->total_len = 0; + state->memsize = 0; + return XXH_OK; +} + +XXH_errorcode XXH64_reset(XXH64_state_t* state_in, unsigned long long seed) +{ + XXH_istate64_t* state = (XXH_istate64_t*) state_in; + state->seed = seed; + state->v1 = seed + PRIME64_1 + PRIME64_2; + state->v2 = seed + PRIME64_2; + state->v3 = seed + 0; + state->v4 = seed - PRIME64_1; + state->total_len = 0; + state->memsize = 0; + return XXH_OK; +} + + +FORCE_INLINE XXH_errorcode XXH32_update_endian (XXH32_state_t* state_in, const void* input, size_t len, XXH_endianess endian) +{ + XXH_istate32_t* state = (XXH_istate32_t *) state_in; + const BYTE* p = (const BYTE*)input; + const BYTE* const bEnd = p + len; + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (input==NULL) return XXH_ERROR; +#endif + + state->total_len += len; + + if (state->memsize + len < 16) // fill in tmp buffer + { + XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len); + state->memsize += (U32)len; + return XXH_OK; + } + + if (state->memsize) // some data left from previous update + { + XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, 16-state->memsize); + { + const U32* p32 = state->mem32; + state->v1 += XXH_readLE32(p32, endian) * PRIME32_2; + state->v1 = XXH_rotl32(state->v1, 13); + state->v1 *= PRIME32_1; + p32++; + state->v2 += XXH_readLE32(p32, endian) * PRIME32_2; + state->v2 = XXH_rotl32(state->v2, 13); + state->v2 *= PRIME32_1; + p32++; + state->v3 += XXH_readLE32(p32, endian) * PRIME32_2; + state->v3 = XXH_rotl32(state->v3, 13); + state->v3 *= PRIME32_1; + p32++; + state->v4 += XXH_readLE32(p32, endian) * PRIME32_2; + state->v4 = XXH_rotl32(state->v4, 13); + state->v4 *= PRIME32_1; + p32++; + } + p += 16-state->memsize; + state->memsize = 0; + } + + if (p <= bEnd-16) + { + const BYTE* const limit = bEnd - 16; + U32 v1 = state->v1; + U32 v2 = state->v2; + U32 v3 = state->v3; + U32 v4 = state->v4; + + do + { + v1 += XXH_readLE32(p, endian) * PRIME32_2; + v1 = XXH_rotl32(v1, 13); + v1 *= PRIME32_1; + p+=4; + v2 += XXH_readLE32(p, endian) * PRIME32_2; + v2 = XXH_rotl32(v2, 13); + v2 *= PRIME32_1; + p+=4; + v3 += XXH_readLE32(p, endian) * PRIME32_2; + v3 = XXH_rotl32(v3, 13); + v3 *= PRIME32_1; + p+=4; + v4 += XXH_readLE32(p, endian) * PRIME32_2; + v4 = XXH_rotl32(v4, 13); + v4 *= PRIME32_1; + p+=4; + } + while (p<=limit); + + state->v1 = v1; + state->v2 = v2; + state->v3 = v3; + state->v4 = v4; + } + + if (p < bEnd) + { + XXH_memcpy(state->mem32, p, bEnd-p); + state->memsize = (int)(bEnd-p); + } + + return XXH_OK; +} + +XXH_errorcode XXH32_update (XXH32_state_t* state_in, const void* input, size_t len) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_update_endian(state_in, input, len, XXH_littleEndian); + else + return XXH32_update_endian(state_in, input, len, XXH_bigEndian); +} + + + +FORCE_INLINE U32 XXH32_digest_endian (const XXH32_state_t* state_in, XXH_endianess endian) +{ + XXH_istate32_t* state = (XXH_istate32_t*) state_in; + const BYTE * p = (const BYTE*)state->mem32; + BYTE* bEnd = (BYTE*)(state->mem32) + state->memsize; + U32 h32; + + if (state->total_len >= 16) + { + h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18); + } + else + { + h32 = state->seed + PRIME32_5; + } + + h32 += (U32) state->total_len; + + while (p+4<=bEnd) + { + h32 += XXH_readLE32(p, endian) * PRIME32_3; + h32 = XXH_rotl32(h32, 17) * PRIME32_4; + p+=4; + } + + while (p<bEnd) + { + h32 += (*p) * PRIME32_5; + h32 = XXH_rotl32(h32, 11) * PRIME32_1; + p++; + } + + h32 ^= h32 >> 15; + h32 *= PRIME32_2; + h32 ^= h32 >> 13; + h32 *= PRIME32_3; + h32 ^= h32 >> 16; + + return h32; +} + + +U32 XXH32_digest (const XXH32_state_t* state_in) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_digest_endian(state_in, XXH_littleEndian); + else + return XXH32_digest_endian(state_in, XXH_bigEndian); +} + + +FORCE_INLINE XXH_errorcode XXH64_update_endian (XXH64_state_t* state_in, const void* input, size_t len, XXH_endianess endian) +{ + XXH_istate64_t * state = (XXH_istate64_t *) state_in; + const BYTE* p = (const BYTE*)input; + const BYTE* const bEnd = p + len; + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (input==NULL) return XXH_ERROR; +#endif + + state->total_len += len; + + if (state->memsize + len < 32) // fill in tmp buffer + { + XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, len); + state->memsize += (U32)len; + return XXH_OK; + } + + if (state->memsize) // some data left from previous update + { + XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, 32-state->memsize); + { + const U64* p64 = state->mem64; + state->v1 += XXH_readLE64(p64, endian) * PRIME64_2; + state->v1 = XXH_rotl64(state->v1, 31); + state->v1 *= PRIME64_1; + p64++; + state->v2 += XXH_readLE64(p64, endian) * PRIME64_2; + state->v2 = XXH_rotl64(state->v2, 31); + state->v2 *= PRIME64_1; + p64++; + state->v3 += XXH_readLE64(p64, endian) * PRIME64_2; + state->v3 = XXH_rotl64(state->v3, 31); + state->v3 *= PRIME64_1; + p64++; + state->v4 += XXH_readLE64(p64, endian) * PRIME64_2; + state->v4 = XXH_rotl64(state->v4, 31); + state->v4 *= PRIME64_1; + p64++; + } + p += 32-state->memsize; + state->memsize = 0; + } + + if (p+32 <= bEnd) + { + const BYTE* const limit = bEnd - 32; + U64 v1 = state->v1; + U64 v2 = state->v2; + U64 v3 = state->v3; + U64 v4 = state->v4; + + do + { + v1 += XXH_readLE64(p, endian) * PRIME64_2; + v1 = XXH_rotl64(v1, 31); + v1 *= PRIME64_1; + p+=8; + v2 += XXH_readLE64(p, endian) * PRIME64_2; + v2 = XXH_rotl64(v2, 31); + v2 *= PRIME64_1; + p+=8; + v3 += XXH_readLE64(p, endian) * PRIME64_2; + v3 = XXH_rotl64(v3, 31); + v3 *= PRIME64_1; + p+=8; + v4 += XXH_readLE64(p, endian) * PRIME64_2; + v4 = XXH_rotl64(v4, 31); + v4 *= PRIME64_1; + p+=8; + } + while (p<=limit); + + state->v1 = v1; + state->v2 = v2; + state->v3 = v3; + state->v4 = v4; + } + + if (p < bEnd) + { + XXH_memcpy(state->mem64, p, bEnd-p); + state->memsize = (int)(bEnd-p); + } + + return XXH_OK; +} + +XXH_errorcode XXH64_update (XXH64_state_t* state_in, const void* input, size_t len) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_update_endian(state_in, input, len, XXH_littleEndian); + else + return XXH64_update_endian(state_in, input, len, XXH_bigEndian); +} + + + +FORCE_INLINE U64 XXH64_digest_endian (const XXH64_state_t* state_in, XXH_endianess endian) +{ + XXH_istate64_t * state = (XXH_istate64_t *) state_in; + const BYTE * p = (const BYTE*)state->mem64; + BYTE* bEnd = (BYTE*)state->mem64 + state->memsize; + U64 h64; + + if (state->total_len >= 32) + { + U64 v1 = state->v1; + U64 v2 = state->v2; + U64 v3 = state->v3; + U64 v4 = state->v4; + + h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18); + + v1 *= PRIME64_2; + v1 = XXH_rotl64(v1, 31); + v1 *= PRIME64_1; + h64 ^= v1; + h64 = h64*PRIME64_1 + PRIME64_4; + + v2 *= PRIME64_2; + v2 = XXH_rotl64(v2, 31); + v2 *= PRIME64_1; + h64 ^= v2; + h64 = h64*PRIME64_1 + PRIME64_4; + + v3 *= PRIME64_2; + v3 = XXH_rotl64(v3, 31); + v3 *= PRIME64_1; + h64 ^= v3; + h64 = h64*PRIME64_1 + PRIME64_4; + + v4 *= PRIME64_2; + v4 = XXH_rotl64(v4, 31); + v4 *= PRIME64_1; + h64 ^= v4; + h64 = h64*PRIME64_1 + PRIME64_4; + } + else + { + h64 = state->seed + PRIME64_5; + } + + h64 += (U64) state->total_len; + + while (p+8<=bEnd) + { + U64 k1 = XXH_readLE64(p, endian); + k1 *= PRIME64_2; + k1 = XXH_rotl64(k1,31); + k1 *= PRIME64_1; + h64 ^= k1; + h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; + p+=8; + } + + if (p+4<=bEnd) + { + h64 ^= (U64)(XXH_readLE32(p, endian)) * PRIME64_1; + h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3; + p+=4; + } + + while (p<bEnd) + { + h64 ^= (*p) * PRIME64_5; + h64 = XXH_rotl64(h64, 11) * PRIME64_1; + p++; + } + + h64 ^= h64 >> 33; + h64 *= PRIME64_2; + h64 ^= h64 >> 29; + h64 *= PRIME64_3; + h64 ^= h64 >> 32; + + return h64; +} + + +unsigned long long XXH64_digest (const XXH64_state_t* state_in) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_digest_endian(state_in, XXH_littleEndian); + else + return XXH64_digest_endian(state_in, XXH_bigEndian); +} + + diff --git a/lib/xxhash.h b/lib/xxhash.h new file mode 100644 index 0000000..55b4501 --- /dev/null +++ b/lib/xxhash.h @@ -0,0 +1,156 @@ +/* + xxHash - Extremely Fast Hash algorithm + Header File + Copyright (C) 2012-2014, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - xxHash source repository : http://code.google.com/p/xxhash/ +*/ + +/* Notice extracted from xxHash homepage : + +xxHash is an extremely fast Hash algorithm, running at RAM speed limits. +It also successfully passes all tests from the SMHasher suite. + +Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2 Duo @3GHz) + +Name Speed Q.Score Author +xxHash 5.4 GB/s 10 +CrapWow 3.2 GB/s 2 Andrew +MumurHash 3a 2.7 GB/s 10 Austin Appleby +SpookyHash 2.0 GB/s 10 Bob Jenkins +SBox 1.4 GB/s 9 Bret Mulvey +Lookup3 1.2 GB/s 9 Bob Jenkins +SuperFastHash 1.2 GB/s 1 Paul Hsieh +CityHash64 1.05 GB/s 10 Pike & Alakuijala +FNV 0.55 GB/s 5 Fowler, Noll, Vo +CRC32 0.43 GB/s 9 +MD5-32 0.33 GB/s 10 Ronald L. Rivest +SHA1-32 0.28 GB/s 10 + +Q.Score is a measure of quality of the hash function. +It depends on successfully passing SMHasher test set. +10 is a perfect score. +*/ + +#pragma once + +#if defined (__cplusplus) +extern "C" { +#endif + + +/***************************** + Includes +*****************************/ +#include <stddef.h> /* size_t */ + + +/***************************** + Type +*****************************/ +typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode; + + + +/***************************** + Simple Hash Functions +*****************************/ + +unsigned int XXH32 (const void* input, size_t length, unsigned seed); +unsigned long long XXH64 (const void* input, size_t length, unsigned long long seed); + +/* +XXH32() : + Calculate the 32-bits hash of sequence "length" bytes stored at memory address "input". + The memory between input & input+length must be valid (allocated and read-accessible). + "seed" can be used to alter the result predictably. + This function successfully passes all SMHasher tests. + Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s +XXH64() : + Calculate the 64-bits hash of sequence of length "len" stored at memory address "input". +*/ + + + +/***************************** + Advanced Hash Functions +*****************************/ +typedef struct { long long ll[ 6]; } XXH32_state_t; +typedef struct { long long ll[11]; } XXH64_state_t; + +/* +These structures allow static allocation of XXH states. +States must then be initialized using XXHnn_reset() before first use. + +If you prefer dynamic allocation, please refer to functions below. +*/ + +XXH32_state_t* XXH32_createState(void); +XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr); + +XXH64_state_t* XXH64_createState(void); +XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr); + +/* +These functions create and release memory for XXH state. +States must then be initialized using XXHnn_reset() before first use. +*/ + + +XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, unsigned seed); +XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length); +unsigned int XXH32_digest (const XXH32_state_t* statePtr); + +XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, unsigned long long seed); +XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length); +unsigned long long XXH64_digest (const XXH64_state_t* statePtr); + +/* +These functions calculate the xxHash of an input provided in multiple smaller packets, +as opposed to an input provided as a single block. + +XXH state space must first be allocated, using either static or dynamic method provided above. + +Start a new hash by initializing state with a seed, using XXHnn_reset(). + +Then, feed the hash state by calling XXHnn_update() as many times as necessary. +Obviously, input must be valid, meaning allocated and read accessible. +The function returns an error code, with 0 meaning OK, and any other value meaning there is an error. + +Finally, you can produce a hash anytime, by using XXHnn_digest(). +This function returns the final nn-bits hash. +You can nonetheless continue feeding the hash state with more input, +and therefore get some new hashes, by calling again XXHnn_digest(). + +When you are done, don't forget to free XXH state space, using typically XXHnn_freeState(). +*/ + + +#if defined (__cplusplus) +} +#endif |