diff options
Diffstat (limited to 'lz4hc_encoder.h')
| -rw-r--r-- | lz4hc_encoder.h | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/lz4hc_encoder.h b/lz4hc_encoder.h deleted file mode 100644 index 49a0f23..0000000 --- a/lz4hc_encoder.h +++ /dev/null @@ -1,349 +0,0 @@ -/*
- LZ4 HC Encoder - Part of LZ4 HC algorithm
- Copyright (C) 2011-2013, 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/
-*/
-
-/* lz4hc_encoder.h must be included into lz4hc.c
- The objective of this file is to create a single LZ4 compression function source
- which will be instanciated multiple times with minor variations
- depending on a set of #define.
-*/
-
-//****************************
-// Check required defines
-//****************************
-
-#ifndef FUNCTION_NAME
-# error "FUNTION_NAME is not defined"
-#endif
-
-
-//****************************
-// Local definitions
-//****************************
-#define COMBINED_NAME_RAW(n1,n2) n1 ## n2
-#define COMBINED_NAME(n1,n2) COMBINED_NAME_RAW(n1,n2)
-#define ENCODE_SEQUENCE_NAME COMBINED_NAME(FUNCTION_NAME,_encodeSequence)
-#ifdef LIMITED_OUTPUT
-# define ENCODE_SEQUENCE(i,o,a,m,r,d) if (ENCODE_SEQUENCE_NAME(i,o,a,m,r,d)) return 0;
-#else
-# define ENCODE_SEQUENCE(i,o,a,m,r,d) ENCODE_SEQUENCE_NAME(i,o,a,m,r)
-#endif
-
-//****************************
-// Function code
-//****************************
-
-forceinline int ENCODE_SEQUENCE_NAME (
- const BYTE** ip,
- BYTE** op,
- const BYTE** anchor,
- int matchLength,
- const BYTE* ref
-#ifdef LIMITED_OUTPUT
- ,BYTE* oend
-#endif
- )
-{
- int length, len;
- BYTE* token;
-
- // Encode Literal length
- length = (int)(*ip - *anchor);
- token = (*op)++;
-#ifdef LIMITED_OUTPUT
- if ((*op + length + (2 + 1 + LASTLITERALS) + (length>>8)) > oend) return 1; // Check output limit
-#endif
- if (length>=(int)RUN_MASK) { *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_BLINDCOPY(*anchor, *op, length);
-
- // Encode Offset
- LZ4_WRITE_LITTLEENDIAN_16(*op,(U16)(*ip-ref));
-
- // Encode MatchLength
- length = (int)(matchLength-MINMATCH);
-#ifdef LIMITED_OUTPUT
- if (*op + (1 + LASTLITERALS) + (length>>8) > oend) return 1; // Check output limit
-#endif
- 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;
-}
-
-
-int COMBINED_NAME(FUNCTION_NAME,_continue) (
- void* ctxvoid,
- const char* source,
- char* dest,
- int inputSize
-#ifdef LIMITED_OUTPUT
- ,int maxOutputSize
-#endif
- )
-{
- 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;
-#ifdef LIMITED_OUTPUT
- BYTE* const oend = op + maxOutputSize;
-#endif
-
- 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;
-
- // Ensure blocks follow each other
- if (ip != ctx->end) return 0;
- ctx->end += inputSize;
-
- ip++;
-
- // Main Loop
- while (ip < mflimit)
- {
- ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref));
- 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);
- else ml2 = ml;
-
- if (ml2 == ml) // No better match
- {
- ENCODE_SEQUENCE(&ip, &op, &anchor, ml, ref, oend);
- 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);
- 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
- ENCODE_SEQUENCE(&ip, &op, &anchor, ml, ref, oend);
- ip = start2;
- ENCODE_SEQUENCE(&ip, &op, &anchor, ml2, ref2, oend);
- 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;
- }
- }
-
- ENCODE_SEQUENCE(&ip, &op, &anchor, ml, ref, oend);
- 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);
- }
- }
- ENCODE_SEQUENCE(&ip, &op, &anchor, ml, ref, oend);
-
- ip = start2;
- ref = ref2;
- ml = ml2;
-
- start2 = start3;
- ref2 = ref3;
- ml2 = ml3;
-
- goto _Search3;
-
- }
-
- // Encode Last Literals
- {
- int lastRun = (int)(iend - anchor);
-#ifdef LIMITED_OUTPUT
- if (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize) return 0; // Check output limit
-#endif
- 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 FUNCTION_NAME (const char* source,
- char* dest,
- int inputSize
-#ifdef LIMITED_OUTPUT
- ,int maxOutputSize
-#endif
- )
-{
- void* ctx = LZ4_createHC(source);
- int result;
- if (ctx==NULL) return 0;
-#ifdef LIMITED_OUTPUT
- result = COMBINED_NAME(FUNCTION_NAME,_continue) (ctx, source, dest, inputSize, maxOutputSize);
-#else
- result = COMBINED_NAME(FUNCTION_NAME,_continue) (ctx, source, dest, inputSize);
-#endif
- LZ4_freeHC(ctx);
-
- return result;
-}
-
-
-//****************************
-// Clean defines
-//****************************
-
-// Required defines
-#undef FUNCTION_NAME
-
-// Locally Generated
-#undef ENCODE_SEQUENCE
-#undef ENCODE_SEQUENCE_NAME
-
-// Optional defines
-#ifdef LIMITED_OUTPUT
-#undef LIMITED_OUTPUT
-#endif
-
-
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