/* LZ4io.c - LZ4 File/Stream Interface Copyright (C) Yann Collet 2011-2015 GPL v2 License This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. You can contact the author at : - LZ4 source repository : https://github.com/Cyan4973/lz4 - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c */ /* Note : this is stand-alone program. It is not part of LZ4 compression library, it is a user code of the LZ4 library. - The license of LZ4 library is BSD. - The license of xxHash library is BSD. - The license of this source file is GPLv2. */ /************************************** * Compiler Options **************************************/ #ifdef _MSC_VER /* Visual Studio */ # define _CRT_SECURE_NO_WARNINGS # define _CRT_SECURE_NO_DEPRECATE /* VS2005 */ # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ #endif #define _LARGE_FILES /* Large file support on 32-bits AIX */ #define _FILE_OFFSET_BITS 64 /* Large file support on 32-bits unix */ /***************************** * Includes *****************************/ #include /* fprintf, fopen, fread, stdin, stdout */ #include /* malloc, free */ #include /* strcmp, strlen */ #include /* clock */ #include "lz4io.h" #include "lz4.h" /* still required for legacy format */ #include "lz4hc.h" /* still required for legacy format */ #include "lz4frame.h" /****************************** * OS-specific Includes ******************************/ #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__) # include /* _O_BINARY */ # include /* _setmode, _fileno, _get_osfhandle */ # define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY) # include /* DeviceIoControl, HANDLE, FSCTL_SET_SPARSE */ # define SET_SPARSE_FILE_MODE(file) { DWORD dw; DeviceIoControl((HANDLE) _get_osfhandle(_fileno(file)), FSCTL_SET_SPARSE, 0, 0, 0, 0, &dw, 0); } # if defined(_MSC_VER) && (_MSC_VER >= 1400) /* Avoid MSVC fseek()'s 2GiB barrier */ # define fseek _fseeki64 # endif #else # define SET_BINARY_MODE(file) # define SET_SPARSE_FILE_MODE(file) #endif /***************************** * Constants *****************************/ #define KB *(1 <<10) #define MB *(1 <<20) #define GB *(1U<<30) #define _1BIT 0x01 #define _2BITS 0x03 #define _3BITS 0x07 #define _4BITS 0x0F #define _8BITS 0xFF #define MAGICNUMBER_SIZE 4 #define LZ4IO_MAGICNUMBER 0x184D2204 #define LZ4IO_SKIPPABLE0 0x184D2A50 #define LZ4IO_SKIPPABLEMASK 0xFFFFFFF0 #define LEGACY_MAGICNUMBER 0x184C2102 #define CACHELINE 64 #define LEGACY_BLOCKSIZE (8 MB) #define MIN_STREAM_BUFSIZE (192 KB) #define LZ4IO_BLOCKSIZEID_DEFAULT 7 #define sizeT sizeof(size_t) #define maskT (sizeT - 1) /************************************** * Macros **************************************/ #define DISPLAY(...) fprintf(stderr, __VA_ARGS__) #define DISPLAYLEVEL(l, ...) if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); } static int g_displayLevel = 0; /* 0 : no display ; 1: errors ; 2 : + result + interaction + warnings ; 3 : + progression; 4 : + information */ #define DISPLAYUPDATE(l, ...) if (g_displayLevel>=l) { \ if ((LZ4IO_GetMilliSpan(g_time) > refreshRate) || (g_displayLevel>=4)) \ { g_time = clock(); DISPLAY(__VA_ARGS__); \ if (g_displayLevel>=4) fflush(stdout); } } static const unsigned refreshRate = 150; static clock_t g_time = 0; /************************************** * Local Parameters **************************************/ static int g_overwrite = 1; static int g_blockSizeId = LZ4IO_BLOCKSIZEID_DEFAULT; static int g_blockChecksum = 0; static int g_streamChecksum = 1; static int g_blockIndependence = 1; static int g_sparseFileSupport = 0; static const int minBlockSizeID = 4; static const int maxBlockSizeID = 7; /************************************** * Exceptions ***************************************/ #define DEBUG 0 #define DEBUGOUTPUT(...) if (DEBUG) DISPLAY(__VA_ARGS__); #define EXM_THROW(error, ...) \ { \ DEBUGOUTPUT("Error defined at %s, line %i : \n", __FILE__, __LINE__); \ DISPLAYLEVEL(1, "Error %i : ", error); \ DISPLAYLEVEL(1, __VA_ARGS__); \ DISPLAYLEVEL(1, "\n"); \ exit(error); \ } /************************************** * Version modifiers **************************************/ #define EXTENDED_ARGUMENTS #define EXTENDED_HELP #define EXTENDED_FORMAT #define DEFAULT_DECOMPRESSOR decodeLZ4S /* ************************************************** */ /* ****************** Parameters ******************** */ /* ************************************************** */ /* Default setting : overwrite = 1; return : overwrite mode (0/1) */ int LZ4IO_setOverwrite(int yes) { g_overwrite = (yes!=0); return g_overwrite; } /* blockSizeID : valid values : 4-5-6-7 */ int LZ4IO_setBlockSizeID(int bsid) { static const int blockSizeTable[] = { 64 KB, 256 KB, 1 MB, 4 MB }; if ((bsid < minBlockSizeID) || (bsid > maxBlockSizeID)) return -1; g_blockSizeId = bsid; return blockSizeTable[g_blockSizeId-minBlockSizeID]; } int LZ4IO_setBlockMode(LZ4IO_blockMode_t blockMode) { g_blockIndependence = (blockMode == LZ4IO_blockIndependent); return g_blockIndependence; } /* Default setting : no checksum */ int LZ4IO_setBlockChecksumMode(int xxhash) { g_blockChecksum = (xxhash != 0); return g_blockChecksum; } /* Default setting : checksum enabled */ int LZ4IO_setStreamChecksumMode(int xxhash) { g_streamChecksum = (xxhash != 0); return g_streamChecksum; } /* Default setting : 0 (no notification) */ int LZ4IO_setNotificationLevel(int level) { g_displayLevel = level; return g_displayLevel; } /* Default setting : 0 (disabled) */ int LZ4IO_setSparseFile(int enable) { g_sparseFileSupport = (enable!=0); return g_sparseFileSupport; } static unsigned LZ4IO_GetMilliSpan(clock_t nPrevious) { clock_t nCurrent = clock(); unsigned nSpan = (unsigned)(((nCurrent - nPrevious) * 1000) / CLOCKS_PER_SEC); return nSpan; } /* ************************************************************************ ** ** ********************** LZ4 File / Pipe compression ********************* ** ** ************************************************************************ */ static int LZ4IO_GetBlockSize_FromBlockId (int id) { return (1 << (8 + (2 * id))); } static int LZ4IO_isSkippableMagicNumber(unsigned int magic) { return (magic & LZ4IO_SKIPPABLEMASK) == LZ4IO_SKIPPABLE0; } static int get_fileHandle(const char* input_filename, const char* output_filename, FILE** pfinput, FILE** pfoutput) { if (!strcmp (input_filename, stdinmark)) { DISPLAYLEVEL(4,"Using stdin for input\n"); *pfinput = stdin; SET_BINARY_MODE(stdin); } else { *pfinput = fopen(input_filename, "rb"); } if (!strcmp (output_filename, stdoutmark)) { DISPLAYLEVEL(4,"Using stdout for output\n"); *pfoutput = stdout; SET_BINARY_MODE(stdout); } else { /* Check if destination file already exists */ *pfoutput=0; if (output_filename != nulmark) *pfoutput = fopen( output_filename, "rb" ); if (*pfoutput!=0) { fclose(*pfoutput); if (!g_overwrite) { char ch; DISPLAYLEVEL(2, "Warning : %s already exists\n", output_filename); DISPLAYLEVEL(2, "Overwrite ? (Y/N) : "); if (g_displayLevel <= 1) EXM_THROW(11, "Operation aborted : %s already exists", output_filename); /* No interaction possible */ ch = (char)getchar(); if ((ch!='Y') && (ch!='y')) EXM_THROW(11, "Operation aborted : %s already exists", output_filename); } } *pfoutput = fopen( output_filename, "wb" ); } if ( *pfinput==0 ) EXM_THROW(12, "Pb opening %s", input_filename); if ( *pfoutput==0) EXM_THROW(13, "Pb opening %s", output_filename); return 0; } /*************************************** * Legacy Compression ***************************************/ /* unoptimized version; solves endianess & alignment issues */ static void LZ4IO_writeLE32 (void* p, unsigned value32) { unsigned char* dstPtr = (unsigned char*)p; dstPtr[0] = (unsigned char)value32; dstPtr[1] = (unsigned char)(value32 >> 8); dstPtr[2] = (unsigned char)(value32 >> 16); dstPtr[3] = (unsigned char)(value32 >> 24); } /* LZ4IO_compressFilename_Legacy : * This function is intentionally "hidden" (not published in .h) * It generates compressed streams using the old 'legacy' format */ int LZ4IO_compressFilename_Legacy(const char* input_filename, const char* output_filename, int compressionlevel) { int (*compressionFunction)(const char*, char*, int); unsigned long long filesize = 0; unsigned long long compressedfilesize = MAGICNUMBER_SIZE; char* in_buff; char* out_buff; FILE* finput; FILE* foutput; clock_t start, end; size_t sizeCheck; /* Init */ start = clock(); if (compressionlevel < 3) compressionFunction = LZ4_compress; else compressionFunction = LZ4_compressHC; get_fileHandle(input_filename, output_filename, &finput, &foutput); if ((g_displayLevel==2) && (compressionlevel==1)) g_displayLevel=3; /* Allocate Memory */ in_buff = (char*)malloc(LEGACY_BLOCKSIZE); out_buff = (char*)malloc(LZ4_compressBound(LEGACY_BLOCKSIZE)); if (!in_buff || !out_buff) EXM_THROW(21, "Allocation error : not enough memory"); /* Write Archive Header */ LZ4IO_writeLE32(out_buff, LEGACY_MAGICNUMBER); sizeCheck = fwrite(out_buff, 1, MAGICNUMBER_SIZE, foutput); if (sizeCheck!=MAGICNUMBER_SIZE) EXM_THROW(22, "Write error : cannot write header"); /* Main Loop */ while (1) { unsigned int outSize; /* Read Block */ int inSize = (int) fread(in_buff, (size_t)1, (size_t)LEGACY_BLOCKSIZE, finput); if( inSize<=0 ) break; filesize += inSize; /* Compress Block */ outSize = compressionFunction(in_buff, out_buff+4, inSize); compressedfilesize += outSize+4; DISPLAYUPDATE(3, "\rRead : %i MB ==> %.2f%% ", (int)(filesize>>20), (double)compressedfilesize/filesize*100); /* Write Block */ LZ4IO_writeLE32(out_buff, outSize); sizeCheck = fwrite(out_buff, 1, outSize+4, foutput); if (sizeCheck!=(size_t)(outSize+4)) EXM_THROW(23, "Write error : cannot write compressed block"); } /* Status */ end = clock(); DISPLAYLEVEL(2, "\r%79s\r", ""); DISPLAYLEVEL(2,"Compressed %llu bytes into %llu bytes ==> %.2f%%\n", (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100); { double seconds = (double)(end - start)/CLOCKS_PER_SEC; DISPLAYLEVEL(4,"Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024); } /* Close & Free */ free(in_buff); free(out_buff); fclose(finput); fclose(foutput); return 0; } /********************************************* * Compression using Frame format *********************************************/ int LZ4IO_compressFilename(const char* input_filename, const char* output_filename, int compressionLevel) { unsigned long long filesize = 0; unsigned long long compressedfilesize = 0; char* in_buff; char* out_buff; FILE* finput; FILE* foutput; clock_t start, end; int blockSize; size_t sizeCheck, headerSize, readSize, outBuffSize; LZ4F_compressionContext_t ctx; LZ4F_errorCode_t errorCode; LZ4F_preferences_t prefs; /* Init */ start = clock(); memset(&prefs, 0, sizeof(prefs)); if ((g_displayLevel==2) && (compressionLevel>=3)) g_displayLevel=3; errorCode = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION); if (LZ4F_isError(errorCode)) EXM_THROW(30, "Allocation error : can't create LZ4F context : %s", LZ4F_getErrorName(errorCode)); get_fileHandle(input_filename, output_filename, &finput, &foutput); blockSize = LZ4IO_GetBlockSize_FromBlockId (g_blockSizeId); /* Set compression parameters */ prefs.autoFlush = 1; prefs.compressionLevel = compressionLevel; prefs.frameInfo.blockMode = (blockMode_t)g_blockIndependence; prefs.frameInfo.blockSizeID = (blockSizeID_t)g_blockSizeId; prefs.frameInfo.contentChecksumFlag = (contentChecksum_t)g_streamChecksum; /* Allocate Memory */ in_buff = (char*)malloc(blockSize); outBuffSize = LZ4F_compressBound(blockSize, &prefs); out_buff = (char*)malloc(outBuffSize); if (!in_buff || !out_buff) EXM_THROW(31, "Allocation error : not enough memory"); /* Write Archive Header */ headerSize = LZ4F_compressBegin(ctx, out_buff, outBuffSize, &prefs); if (LZ4F_isError(headerSize)) EXM_THROW(32, "File header generation failed : %s", LZ4F_getErrorName(headerSize)); sizeCheck = fwrite(out_buff, 1, headerSize, foutput); if (sizeCheck!=headerSize) EXM_THROW(33, "Write error : cannot write header"); compressedfilesize += headerSize; /* read first block */ readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput); filesize += readSize; /* Main Loop */ while (readSize>0) { size_t outSize; /* Compress Block */ outSize = LZ4F_compressUpdate(ctx, out_buff, outBuffSize, in_buff, readSize, NULL); if (LZ4F_isError(outSize)) EXM_THROW(34, "Compression failed : %s", LZ4F_getErrorName(outSize)); compressedfilesize += outSize; DISPLAYUPDATE(3, "\rRead : %i MB ==> %.2f%% ", (int)(filesize>>20), (double)compressedfilesize/filesize*100); /* Write Block */ sizeCheck = fwrite(out_buff, 1, outSize, foutput); if (sizeCheck!=outSize) EXM_THROW(35, "Write error : cannot write compressed block"); /* Read next block */ readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput); filesize += readSize; } /* End of Stream mark */ headerSize = LZ4F_compressEnd(ctx, out_buff, outBuffSize, NULL); if (LZ4F_isError(headerSize)) EXM_THROW(36, "End of file generation failed : %s", LZ4F_getErrorName(headerSize)); sizeCheck = fwrite(out_buff, 1, headerSize, foutput); if (sizeCheck!=headerSize) EXM_THROW(37, "Write error : cannot write end of stream"); compressedfilesize += headerSize; /* Close & Free */ free(in_buff); free(out_buff); fclose(finput); fclose(foutput); errorCode = LZ4F_freeCompressionContext(ctx); if (LZ4F_isError(errorCode)) EXM_THROW(38, "Error : can't free LZ4F context resource : %s", LZ4F_getErrorName(errorCode)); /* Final Status */ end = clock(); DISPLAYLEVEL(2, "\r%79s\r", ""); DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n", (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100); { double seconds = (double)(end - start)/CLOCKS_PER_SEC; DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024); } return 0; } #define FNSPACE 30 int LZ4IO_compressMultipleFilenames(const char** inFileNamesTable, int ifntSize, const char* suffix, int compressionlevel) { int i; char* outFileName = (char*)malloc(FNSPACE); size_t ofnSize = FNSPACE; const size_t suffixSize = strlen(suffix); for (i=0; i LZ4_COMPRESSBOUND(LEGACY_BLOCKSIZE)) { /* Cannot read next block : maybe new stream ? */ fseek(finput, -4, SEEK_CUR); break; } /* Read Block */ sizeCheck = fread(in_buff, 1, blockSize, finput); if (sizeCheck!=blockSize) EXM_THROW(52, "Read error : cannot access compressed block !"); /* Decode Block */ decodeSize = LZ4_decompress_safe(in_buff, out_buff, blockSize, LEGACY_BLOCKSIZE); if (decodeSize < 0) EXM_THROW(53, "Decoding Failed ! Corrupted input detected !"); filesize += decodeSize; /* Write Block */ sizeCheck = fwrite(out_buff, 1, decodeSize, foutput); if (sizeCheck != (size_t)decodeSize) EXM_THROW(54, "Write error : cannot write decoded block into output\n"); } /* Free */ free(in_buff); free(out_buff); return filesize; } static unsigned long long decodeLZ4S(FILE* finput, FILE* foutput) { unsigned long long filesize = 0; void* inBuff; void* outBuff; # define HEADERMAX 20 char headerBuff[HEADERMAX]; size_t sizeCheck, nextToRead, outBuffSize, inBuffSize; LZ4F_decompressionContext_t ctx; LZ4F_errorCode_t errorCode; LZ4F_frameInfo_t frameInfo; unsigned storedSkips = 0; /* init */ errorCode = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION); if (LZ4F_isError(errorCode)) EXM_THROW(60, "Allocation error : can't create context : %s", LZ4F_getErrorName(errorCode)); LZ4IO_writeLE32(headerBuff, LZ4IO_MAGICNUMBER); /* regenerated here, as it was already read from finput */ /* Decode stream descriptor */ outBuffSize = 0; inBuffSize = 0; sizeCheck = MAGICNUMBER_SIZE; nextToRead = LZ4F_decompress(ctx, NULL, &outBuffSize, headerBuff, &sizeCheck, NULL); if (LZ4F_isError(nextToRead)) EXM_THROW(61, "Decompression error : %s", LZ4F_getErrorName(nextToRead)); if (nextToRead > HEADERMAX) EXM_THROW(62, "Header too large (%i>%i)", (int)nextToRead, HEADERMAX); sizeCheck = fread(headerBuff, 1, nextToRead, finput); if (sizeCheck!=nextToRead) EXM_THROW(63, "Read error "); nextToRead = LZ4F_decompress(ctx, NULL, &outBuffSize, headerBuff, &sizeCheck, NULL); errorCode = LZ4F_getFrameInfo(ctx, &frameInfo, NULL, &inBuffSize); if (LZ4F_isError(errorCode)) EXM_THROW(64, "can't decode frame header : %s", LZ4F_getErrorName(errorCode)); /* Allocate Memory */ outBuffSize = LZ4IO_setBlockSizeID(frameInfo.blockSizeID); inBuffSize = outBuffSize + 4; inBuff = malloc(inBuffSize); outBuff = malloc(outBuffSize); if (!inBuff || !outBuff) EXM_THROW(65, "Allocation error : not enough memory"); /* Main Loop */ while (nextToRead != 0) { size_t decodedBytes = outBuffSize; /* Read Block */ sizeCheck = fread(inBuff, 1, nextToRead, finput); if (sizeCheck!=nextToRead) EXM_THROW(66, "Read error "); /* Decode Block */ errorCode = LZ4F_decompress(ctx, outBuff, &decodedBytes, inBuff, &sizeCheck, NULL); if (LZ4F_isError(errorCode)) EXM_THROW(67, "Decompression error : %s", LZ4F_getErrorName(errorCode)); if (sizeCheck!=nextToRead) EXM_THROW(67, "Synchronization error"); nextToRead = errorCode; filesize += decodedBytes; /* Write Block */ if (g_sparseFileSupport) { size_t* const oBuffStartT = (size_t*)outBuff; /* since outBuff is malloc'ed, it's aligned on size_t */ size_t* oBuffPosT = oBuffStartT; size_t oBuffSizeT = decodedBytes / sizeT; size_t* const oBuffEndT = oBuffStartT + oBuffSizeT; static const size_t bs0T = (32 KB) / sizeT; while (oBuffPosT < oBuffEndT) { size_t seg0SizeT = bs0T; size_t nb0T; int seekResult; if (seg0SizeT > oBuffSizeT) seg0SizeT = oBuffSizeT; oBuffSizeT -= seg0SizeT; for (nb0T=0; (nb0T < seg0SizeT) && (oBuffPosT[nb0T] == 0); nb0T++) ; storedSkips += (unsigned)(nb0T * sizeT); if (storedSkips > 1 GB) /* avoid int overflow */ { seekResult = fseek(foutput, 1 GB, SEEK_CUR); if (seekResult != 0) EXM_THROW(68, "1 GB skip error (sparse file)"); storedSkips -= 1 GB; } if (nb0T != seg0SizeT) { seekResult = fseek(foutput, storedSkips, SEEK_CUR); if (seekResult) EXM_THROW(68, "Skip error (sparse file)"); storedSkips = 0; seg0SizeT -= nb0T; oBuffPosT += nb0T; sizeCheck = fwrite(oBuffPosT, sizeT, seg0SizeT, foutput); if (sizeCheck != seg0SizeT) EXM_THROW(68, "Write error : cannot write decoded block"); } oBuffPosT += seg0SizeT; } if (decodedBytes & maskT) /* size not multiple of sizeT (necessarily end of block) */ { const char* const restStart = (char*)oBuffEndT; const char* restPtr = restStart; size_t restSize = decodedBytes & maskT; const char* const restEnd = restStart + restSize; for (; (restPtr < restEnd) && (*restPtr == 0); restPtr++) ; storedSkips += (unsigned) (restPtr - restStart); if (restPtr != restEnd) { int seekResult = fseek(foutput, storedSkips, SEEK_CUR); if (seekResult) EXM_THROW(68, "Skip error (end of block)"); storedSkips = 0; sizeCheck = fwrite(restPtr, 1, restEnd - restPtr, foutput); if (sizeCheck != (size_t)(restEnd - restPtr)) EXM_THROW(68, "Write error : cannot write decoded end of block"); } } } else { sizeCheck = fwrite(outBuff, 1, decodedBytes, foutput); if (sizeCheck != decodedBytes) EXM_THROW(68, "Write error : cannot write decoded block"); } } if ((g_sparseFileSupport) && (storedSkips>0)) { int seekResult; storedSkips --; seekResult = fseek(foutput, storedSkips, SEEK_CUR); if (seekResult != 0) EXM_THROW(69, "Final skip error (sparse file)\n"); memset(outBuff, 0, 1); sizeCheck = fwrite(outBuff, 1, 1, foutput); if (sizeCheck != 1) EXM_THROW(69, "Write error : cannot write last zero\n"); } /* Free */ free(inBuff); free(outBuff); errorCode = LZ4F_freeDecompressionContext(ctx); if (LZ4F_isError(errorCode)) EXM_THROW(69, "Error : can't free LZ4F context resource : %s", LZ4F_getErrorName(errorCode)); return filesize; } static unsigned long long LZ4IO_passThrough(FILE* finput, FILE* foutput, unsigned char U32store[MAGICNUMBER_SIZE]) { void* buffer = malloc(64 KB); size_t read = 1, sizeCheck; unsigned long long total = MAGICNUMBER_SIZE; sizeCheck = fwrite(U32store, 1, MAGICNUMBER_SIZE, foutput); if (sizeCheck != MAGICNUMBER_SIZE) EXM_THROW(50, "Pass-through error at start"); while (read) { read = fread(buffer, 1, 64 KB, finput); total += read; sizeCheck = fwrite(buffer, 1, read, foutput); if (sizeCheck != read) EXM_THROW(50, "Pass-through error"); } free(buffer); return total; } #define ENDOFSTREAM ((unsigned long long)-1) static unsigned long long selectDecoder( FILE* finput, FILE* foutput) { unsigned char U32store[MAGICNUMBER_SIZE]; unsigned magicNumber, size; int errorNb; size_t nbReadBytes; static unsigned nbCalls = 0; /* init */ nbCalls++; /* Check Archive Header */ nbReadBytes = fread(U32store, 1, MAGICNUMBER_SIZE, finput); if (nbReadBytes==0) return ENDOFSTREAM; /* EOF */ if (nbReadBytes != MAGICNUMBER_SIZE) EXM_THROW(40, "Unrecognized header : Magic Number unreadable"); magicNumber = LZ4IO_readLE32(U32store); /* Little Endian format */ if (LZ4IO_isSkippableMagicNumber(magicNumber)) magicNumber = LZ4IO_SKIPPABLE0; /* fold skippable magic numbers */ switch(magicNumber) { case LZ4IO_MAGICNUMBER: return DEFAULT_DECOMPRESSOR(finput, foutput); case LEGACY_MAGICNUMBER: DISPLAYLEVEL(4, "Detected : Legacy format \n"); return decodeLegacyStream(finput, foutput); case LZ4IO_SKIPPABLE0: DISPLAYLEVEL(4, "Skipping detected skippable area \n"); nbReadBytes = fread(U32store, 1, 4, finput); if (nbReadBytes != 4) EXM_THROW(42, "Stream error : skippable size unreadable"); size = LZ4IO_readLE32(U32store); /* Little Endian format */ errorNb = fseek(finput, size, SEEK_CUR); if (errorNb != 0) EXM_THROW(43, "Stream error : cannot skip skippable area"); return selectDecoder(finput, foutput); EXTENDED_FORMAT; default: if (nbCalls == 1) /* just started */ { if (g_overwrite) return LZ4IO_passThrough(finput, foutput, U32store); EXM_THROW(44,"Unrecognized header : file cannot be decoded"); /* Wrong magic number at the beginning of 1st stream */ } DISPLAYLEVEL(2, "Stream followed by unrecognized data\n"); return ENDOFSTREAM; } } int LZ4IO_decompressFilename(const char* input_filename, const char* output_filename) { unsigned long long filesize = 0, decodedSize=0; FILE* finput; FILE* foutput; clock_t start, end; /* Init */ start = clock(); get_fileHandle(input_filename, output_filename, &finput, &foutput); /* sparse file */ if (g_sparseFileSupport && foutput) { SET_SPARSE_FILE_MODE(foutput); } /* Loop over multiple streams */ do { decodedSize = selectDecoder(finput, foutput); if (decodedSize != ENDOFSTREAM) filesize += decodedSize; } while (decodedSize != ENDOFSTREAM); /* Final Status */ end = clock(); DISPLAYLEVEL(2, "\r%79s\r", ""); DISPLAYLEVEL(2, "Successfully decoded %llu bytes \n", filesize); { double seconds = (double)(end - start)/CLOCKS_PER_SEC; DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024); } /* Close */ fclose(finput); fclose(foutput); /* Error status = OK */ return 0; }