Remove file after restructuring

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Emmanuel Marty 2019-06-07 23:18:14 +02:00 committed by GitHub
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src/lib.c
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/*
* lib.c - LZSA library implementation
*
* Copyright (C) 2019 Emmanuel Marty
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/*
* Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
*
* Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
* With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
* With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
* Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lib.h"
#include "matchfinder.h"
#include "shrink_v1.h"
#include "shrink_v2.h"
#include "expand_v1.h"
#include "expand_v2.h"
#include "format.h"
#include "frame.h"
#define BLOCK_SIZE 65536
/*-------------- Top level API -------------- */
/**
* Compress file
*
* @param pszInFilename name of input(source) file to compress
* @param pszOutFilename name of output(compressed) file to generate
* @param pszDictionaryFilename name of dictionary file, or NULL for none
* @param nFlags compression flags (LZSA_FLAG_xxx)
* @param nMinMatchSize minimum match size
* @param nFormatVersion version of format to use (1-2)
* @param progress progress function, called after compressing each block, or NULL for none
* @param pOriginalSize pointer to returned input(source) size, updated when this function is successful
* @param pCompressedSize pointer to returned output(compressed) size, updated when this function is successful
* @param pCommandCount pointer to returned token(compression commands) count, updated when this function is successful
*
* @return LZSA_OK for success, or an error value from lzsa_status_t
*/
lzsa_status_t lsza_compress_file(const char *pszInFilename, const char *pszOutFilename, const char *pszDictionaryFilename, const unsigned int nFlags, const int nMinMatchSize, const int nFormatVersion,
void(*progress)(long long nOriginalSize, long long nCompressedSize), long long *pOriginalSize, long long *pCompressedSize, int *pCommandCount) {
lzsa_stream_t inStream, outStream;
void *pDictionaryData = NULL;
int nDictionaryDataSize = 0;
lzsa_status_t nStatus;
if (lzsa_filestream_open(&inStream, pszInFilename, "rb") < 0) {
return LZSA_ERROR_SRC;
}
if (lzsa_filestream_open(&outStream, pszOutFilename, "wb") < 0) {
inStream.close(&inStream);
return LZSA_ERROR_DST;
}
nStatus = lzsa_dictionary_load(pszDictionaryFilename, &pDictionaryData, &nDictionaryDataSize);
if (nStatus) {
outStream.close(&outStream);
inStream.close(&inStream);
return nStatus;
}
nStatus = lsza_compress_stream(&inStream, &outStream, pDictionaryData, nDictionaryDataSize, nFlags, nMinMatchSize, nFormatVersion, progress, pOriginalSize, pCompressedSize, pCommandCount);
lzsa_dictionary_free(&pDictionaryData);
outStream.close(&outStream);
inStream.close(&inStream);
return nStatus;
}
/**
* Decompress file
*
* @param pszInFilename name of input(compressed) file to decompress
* @param pszOutFilename name of output(decompressed) file to generate
* @param pszDictionaryFilename name of dictionary file, or NULL for none
* @param nFlags compression flags (LZSA_FLAG_RAW_BLOCK to decompress a raw block, or 0)
* @param nFormatVersion default version of format to use (1-2). This is used when decompressing a raw block, otherwise the version is extracted from the source file
* @param pOriginalSize pointer to returned output(decompressed) size, updated when this function is successful
* @param pCompressedSize pointer to returned input(compressed) size, updated when this function is successful
*
* @return LZSA_OK for success, or an error value from lzsa_status_t
*/
lzsa_status_t lzsa_decompress_file(const char *pszInFilename, const char *pszOutFilename, const char *pszDictionaryFilename, const unsigned int nFlags, int nFormatVersion,
long long *pOriginalSize, long long *pCompressedSize) {
lzsa_stream_t inStream, outStream;
void *pDictionaryData = NULL;
int nDictionaryDataSize = 0;
lzsa_status_t nStatus;
if (lzsa_filestream_open(&inStream, pszInFilename, "rb") < 0) {
return LZSA_ERROR_SRC;
}
if (lzsa_filestream_open(&outStream, pszOutFilename, "wb") < 0) {
inStream.close(&inStream);
return LZSA_ERROR_DST;
}
nStatus = lzsa_dictionary_load(pszDictionaryFilename, &pDictionaryData, &nDictionaryDataSize);
if (nStatus) {
outStream.close(&outStream);
inStream.close(&inStream);
return nStatus;
}
nStatus = lzsa_decompress_stream(&inStream, &outStream, pDictionaryData, nDictionaryDataSize, nFlags, nFormatVersion, pOriginalSize, pCompressedSize);
lzsa_dictionary_free(&pDictionaryData);
outStream.close(&outStream);
inStream.close(&inStream);
return nStatus;
}
/*-------------- Streaming API -------------- */
/**
* Load dictionary contents
*
* @param pszDictionaryFilename name of dictionary file, or NULL for none
* @param pDictionaryData pointer to returned dictionary contents, or NULL for none
* @param nDictionaryDataSize pointer to returned size of dictionary contents, or 0
*
* @return LZSA_OK for success, or an error value from lzsa_status_t
*/
int lzsa_dictionary_load(const char *pszDictionaryFilename, void **ppDictionaryData, int *pDictionaryDataSize) {
unsigned char *pDictionaryData = NULL;
int nDictionaryDataSize = 0;
if (pszDictionaryFilename) {
pDictionaryData = (unsigned char *)malloc(BLOCK_SIZE);
if (!pDictionaryData) {
return LZSA_ERROR_MEMORY;
}
FILE *pDictionaryFile = fopen(pszDictionaryFilename, "rb");
if (!pDictionaryFile) {
free(pDictionaryData);
pDictionaryData = NULL;
return LZSA_ERROR_DICTIONARY;
}
fseek(pDictionaryFile, 0, SEEK_END);
#ifdef _WIN32
__int64 nDictionaryFileSize = _ftelli64(pDictionaryFile);
#else
off_t nDictionaryFileSize = ftello(pDictionaryFile);
#endif
if (nDictionaryFileSize > BLOCK_SIZE) {
/* Use the last BLOCK_SIZE bytes of the dictionary */
fseek(pDictionaryFile, -BLOCK_SIZE, SEEK_END);
}
else {
fseek(pDictionaryFile, 0, SEEK_SET);
}
nDictionaryDataSize = (int)fread(pDictionaryData, 1, BLOCK_SIZE, pDictionaryFile);
if (nDictionaryDataSize < 0)
nDictionaryDataSize = 0;
fclose(pDictionaryFile);
pDictionaryFile = NULL;
}
*ppDictionaryData = pDictionaryData;
*pDictionaryDataSize = nDictionaryDataSize;
return LZSA_OK;
}
/**
* Free dictionary contents
*
* @param pDictionaryData pointer to pointer to dictionary contents
*/
void lzsa_dictionary_free(void **ppDictionaryData) {
if (*ppDictionaryData) {
free(*ppDictionaryData);
ppDictionaryData = NULL;
}
}
/**
* Compress stream
*
* @param pInStream input(source) stream to compress
* @param pOutStream output(compressed) stream to write to
* @param pDictionaryData dictionary contents, or NULL for none
* @param nDictionaryDataSize size of dictionary contents, or 0
* @param nFlags compression flags (LZSA_FLAG_xxx)
* @param nMinMatchSize minimum match size
* @param nFormatVersion version of format to use (1-2)
* @param progress progress function, called after compressing each block, or NULL for none
* @param pOriginalSize pointer to returned input(source) size, updated when this function is successful
* @param pCompressedSize pointer to returned output(compressed) size, updated when this function is successful
* @param pCommandCount pointer to returned token(compression commands) count, updated when this function is successful
*
* @return LZSA_OK for success, or an error value from lzsa_status_t
*/
lzsa_status_t lsza_compress_stream(lzsa_stream_t *pInStream, lzsa_stream_t *pOutStream, const void *pDictionaryData, int nDictionaryDataSize,
const unsigned int nFlags, const int nMinMatchSize, const int nFormatVersion,
void(*progress)(long long nOriginalSize, long long nCompressedSize), long long *pOriginalSize, long long *pCompressedSize, int *pCommandCount) {
unsigned char *pInData, *pOutData;
lsza_compressor compressor;
long long nStartTime = 0LL, nEndTime = 0LL;
long long nOriginalSize = 0LL, nCompressedSize = 0LL;
int nResult;
unsigned char cFrameData[16];
int nError = 0;
pInData = (unsigned char*)malloc(BLOCK_SIZE * 2);
if (!pInData) {
return LZSA_ERROR_MEMORY;
}
memset(pInData, 0, BLOCK_SIZE * 2);
pOutData = (unsigned char*)malloc(BLOCK_SIZE);
if (!pOutData) {
free(pInData);
pInData = NULL;
return LZSA_ERROR_MEMORY;
}
memset(pOutData, 0, BLOCK_SIZE);
nResult = lzsa_compressor_init(&compressor, BLOCK_SIZE * 2, nMinMatchSize, nFormatVersion, nFlags);
if (nResult != 0) {
free(pOutData);
pOutData = NULL;
free(pInData);
pInData = NULL;
return LZSA_ERROR_MEMORY;
}
if ((nFlags & LZSA_FLAG_RAW_BLOCK) == 0) {
int nHeaderSize = lzsa_encode_header(cFrameData, 16, nFormatVersion);
if (nHeaderSize < 0)
nError = LZSA_ERROR_COMPRESSION;
else {
if (pOutStream->write(pOutStream, cFrameData, nHeaderSize) != nHeaderSize)
nError = LZSA_ERROR_DST;
nCompressedSize += (long long)nHeaderSize;
}
}
int nPreviousBlockSize = 0;
int nNumBlocks = 0;
while (!pInStream->eof(pInStream) && !nError) {
int nInDataSize;
if (nPreviousBlockSize) {
memcpy(pInData + BLOCK_SIZE - nPreviousBlockSize, pInData + BLOCK_SIZE, nPreviousBlockSize);
}
else if (nDictionaryDataSize && pDictionaryData) {
nPreviousBlockSize = nDictionaryDataSize;
memcpy(pInData + BLOCK_SIZE - nPreviousBlockSize, pDictionaryData, nPreviousBlockSize);
}
nInDataSize = (int)pInStream->read(pInStream, pInData + BLOCK_SIZE, BLOCK_SIZE);
if (nInDataSize > 0) {
if ((nFlags & LZSA_FLAG_RAW_BLOCK) != 0 && nNumBlocks) {
nError = LZSA_ERROR_RAW_TOOLARGE;
break;
}
nDictionaryDataSize = 0;
int nOutDataSize;
nOutDataSize = lzsa_compressor_shrink_block(&compressor, pInData + BLOCK_SIZE - nPreviousBlockSize, nPreviousBlockSize, nInDataSize, pOutData, (nInDataSize >= BLOCK_SIZE) ? BLOCK_SIZE : nInDataSize);
if (nOutDataSize >= 0) {
/* Write compressed block */
if ((nFlags & LZSA_FLAG_RAW_BLOCK) == 0) {
int nBlockheaderSize = lzsa_encode_compressed_block_frame(cFrameData, 16, nOutDataSize);
if (nBlockheaderSize < 0)
nError = LZSA_ERROR_COMPRESSION;
else {
nCompressedSize += (long long)nBlockheaderSize;
if (pOutStream->write(pOutStream, cFrameData, nBlockheaderSize) != (size_t)nBlockheaderSize) {
nError = LZSA_ERROR_DST;
}
}
}
if (!nError) {
if (pOutStream->write(pOutStream, pOutData, (size_t)nOutDataSize) != (size_t)nOutDataSize) {
nError = LZSA_ERROR_DST;
}
else {
nOriginalSize += (long long)nInDataSize;
nCompressedSize += (long long)nOutDataSize;
}
}
}
else {
/* Write uncompressible, literal block */
if ((nFlags & LZSA_FLAG_RAW_BLOCK) != 0) {
nError = LZSA_ERROR_RAW_UNCOMPRESSED;
break;
}
int nBlockheaderSize = lzsa_encode_uncompressed_block_frame(cFrameData, 16, nInDataSize);
if (nBlockheaderSize < 0)
nError = LZSA_ERROR_COMPRESSION;
else {
if (pOutStream->write(pOutStream, cFrameData, nBlockheaderSize) != (size_t)nBlockheaderSize) {
nError = LZSA_ERROR_DST;
}
else {
if (pOutStream->write(pOutStream, pInData + BLOCK_SIZE, (size_t)nInDataSize) != (size_t)nInDataSize) {
nError = LZSA_ERROR_DST;
}
else {
nOriginalSize += (long long)nInDataSize;
nCompressedSize += (long long)nBlockheaderSize + (long long)nInDataSize;
}
}
}
}
nPreviousBlockSize = nInDataSize;
nNumBlocks++;
}
if (!nError && !pInStream->eof(pInStream)) {
if (progress)
progress(nOriginalSize, nCompressedSize);
}
}
if (!nError) {
int nFooterSize;
if ((nFlags & LZSA_FLAG_RAW_BLOCK) != 0) {
nFooterSize = 0;
}
else {
nFooterSize = lzsa_encode_footer_frame(cFrameData, 16);
if (nFooterSize < 0)
nError = LZSA_ERROR_COMPRESSION;
}
if (pOutStream->write(pOutStream, cFrameData, nFooterSize) != nFooterSize)
nError = LZSA_ERROR_DST;
nCompressedSize += (long long)nFooterSize;
}
if (progress)
progress(nOriginalSize, nCompressedSize);
int nCommandCount = lzsa_compressor_get_command_count(&compressor);
lzsa_compressor_destroy(&compressor);
free(pOutData);
pOutData = NULL;
free(pInData);
pInData = NULL;
if (nError) {
return nError;
}
else {
if (pOriginalSize)
*pOriginalSize = nOriginalSize;
if (pCompressedSize)
*pCompressedSize = nCompressedSize;
if (pCommandCount)
*pCommandCount = nCommandCount;
return LZSA_OK;
}
}
/**
* Decompress stream
*
* @param pInStream input(compressed) stream to decompress
* @param pOutStream output(decompressed) stream to write to
* @param pDictionaryData dictionary contents, or NULL for none
* @param nDictionaryDataSize size of dictionary contents, or 0
* @param nFlags compression flags (LZSA_FLAG_RAW_BLOCK to decompress a raw block, or 0)
* @param nFormatVersion default version of format to use (1-2). This is used when decompressing a raw block, otherwise the version is extracted from the source file
* @param pOriginalSize pointer to returned output(decompressed) size, updated when this function is successful
* @param pCompressedSize pointer to returned input(compressed) size, updated when this function is successful
*
* @return LZSA_OK for success, or an error value from lzsa_status_t
*/
lzsa_status_t lzsa_decompress_stream(lzsa_stream_t *pInStream, lzsa_stream_t *pOutStream, const void *pDictionaryData, int nDictionaryDataSize, const unsigned int nFlags, int nFormatVersion,
long long *pOriginalSize, long long *pCompressedSize) {
long long nStartTime = 0LL, nEndTime = 0LL;
long long nOriginalSize = 0LL, nCompressedSize = 0LL;
unsigned char cFrameData[16];
unsigned char *pInBlock;
unsigned char *pOutData;
if ((nFlags & LZSA_FLAG_RAW_BLOCK) == 0) {
const int nHeaderSize = lzsa_get_header_size();
memset(cFrameData, 0, 16);
if (pInStream->read(pInStream, cFrameData, nHeaderSize) != nHeaderSize) {
return LZSA_ERROR_SRC;
}
if (lzsa_decode_header(cFrameData, nHeaderSize, &nFormatVersion) < 0) {
return LZSA_ERROR_FORMAT;
}
nCompressedSize += (long long)nHeaderSize;
}
pInBlock = (unsigned char*)malloc(BLOCK_SIZE);
if (!pInBlock) {
return LZSA_ERROR_MEMORY;
}
pOutData = (unsigned char*)malloc(BLOCK_SIZE * 2);
if (!pOutData) {
free(pInBlock);
pInBlock = NULL;
return LZSA_ERROR_MEMORY;
}
int nDecompressionError = 0;
int nPrevDecompressedSize = 0;
int nNumBlocks = 0;
while (!pInStream->eof(pInStream) && !nDecompressionError) {
unsigned int nBlockSize = 0;
int nIsUncompressed = 0;
if (nPrevDecompressedSize != 0) {
memcpy(pOutData + BLOCK_SIZE - nPrevDecompressedSize, pOutData + BLOCK_SIZE, nPrevDecompressedSize);
}
else if (nDictionaryDataSize && pDictionaryData) {
nPrevDecompressedSize = nDictionaryDataSize;
memcpy(pOutData + BLOCK_SIZE - nPrevDecompressedSize, pDictionaryData, nPrevDecompressedSize);
}
if ((nFlags & LZSA_FLAG_RAW_BLOCK) == 0) {
const int nFrameSize = lzsa_get_frame_size();
memset(cFrameData, 0, 16);
if (pInStream->read(pInStream, cFrameData, nFrameSize) == nFrameSize) {
if (lzsa_decode_frame(cFrameData, nFrameSize, &nBlockSize, &nIsUncompressed) < 0) {
nDecompressionError = LZSA_ERROR_FORMAT;
nBlockSize = 0;
}
nCompressedSize += (long long)nFrameSize;
}
else {
nDecompressionError = LZSA_ERROR_SRC;
nBlockSize = 0;
}
}
else {
if (!nNumBlocks)
nBlockSize = BLOCK_SIZE;
else
nBlockSize = 0;
}
if (nBlockSize != 0) {
int nDecompressedSize = 0;
if ((int)nBlockSize > BLOCK_SIZE) {
nDecompressionError = LZSA_ERROR_FORMAT;
break;
}
size_t nReadBytes = pInStream->read(pInStream, pInBlock, nBlockSize);
if (nFlags & LZSA_FLAG_RAW_BLOCK) {
if (nReadBytes > 4)
nReadBytes -= 4;
else
nReadBytes = 0;
nBlockSize = (unsigned int)nReadBytes;
}
if (nReadBytes == nBlockSize) {
nCompressedSize += (long long)nReadBytes;
if (nIsUncompressed) {
memcpy(pOutData + BLOCK_SIZE, pInBlock, nBlockSize);
nDecompressedSize = nBlockSize;
}
else {
unsigned int nBlockOffs = 0;
nDecompressedSize = lzsa_decompressor_expand_block(nFormatVersion, pInBlock, nBlockSize, pOutData, BLOCK_SIZE, BLOCK_SIZE);
if (nDecompressedSize < 0) {
nDecompressionError = LZSA_ERROR_DECOMPRESSION;
break;
}
}
if (nDecompressedSize != 0) {
nOriginalSize += (long long)nDecompressedSize;
if (pOutStream->write(pOutStream, pOutData + BLOCK_SIZE, nDecompressedSize) != nDecompressedSize)
nDecompressionError = LZSA_ERROR_DST;
nPrevDecompressedSize = nDecompressedSize;
nDecompressedSize = 0;
}
}
else {
break;
}
nNumBlocks++;
}
else {
break;
}
}
free(pOutData);
pOutData = NULL;
free(pInBlock);
pInBlock = NULL;
*pOriginalSize = nOriginalSize;
*pCompressedSize = nCompressedSize;
return nDecompressionError;
}
/*-------------- Block compression API --------------*/
/**
* Initialize compression context
*
* @param pCompressor compression context to initialize
* @param nMaxWindowSize maximum size of input data window (previously compressed bytes + bytes to compress)
* @param nMinMatchSize minimum match size (cannot be less than MIN_MATCH_SIZE)
* @param nFlags compression flags
*
* @return 0 for success, non-zero for failure
*/
int lzsa_compressor_init(lsza_compressor *pCompressor, const int nMaxWindowSize, const int nMinMatchSize, const int nFormatVersion, const int nFlags) {
int nResult;
int nMinMatchSizeForFormat = (nFormatVersion == 1) ? MIN_MATCH_SIZE_V1 : MIN_MATCH_SIZE_V2;
nResult = divsufsort_init(&pCompressor->divsufsort_context);
pCompressor->intervals = NULL;
pCompressor->pos_data = NULL;
pCompressor->open_intervals = NULL;
pCompressor->match = NULL;
pCompressor->best_match = NULL;
pCompressor->slot_cost = NULL;
pCompressor->repmatch_opt = NULL;
pCompressor->min_match_size = nMinMatchSize;
if (pCompressor->min_match_size < nMinMatchSizeForFormat)
pCompressor->min_match_size = nMinMatchSizeForFormat;
else if (pCompressor->min_match_size > 5)
pCompressor->min_match_size = 5;
pCompressor->format_version = nFormatVersion;
pCompressor->flags = nFlags;
pCompressor->num_commands = 0;
if (!nResult) {
pCompressor->intervals = (unsigned int *)malloc(nMaxWindowSize * sizeof(unsigned int));
if (pCompressor->intervals) {
pCompressor->pos_data = (unsigned int *)malloc(nMaxWindowSize * sizeof(unsigned int));
if (pCompressor->pos_data) {
pCompressor->open_intervals = (unsigned int *)malloc((LCP_MAX + 1) * sizeof(unsigned int));
if (pCompressor->open_intervals) {
pCompressor->match = (lzsa_match *)malloc(nMaxWindowSize * NMATCHES_PER_OFFSET * sizeof(lzsa_match));
if (pCompressor->match) {
if (pCompressor->format_version == 2) {
pCompressor->best_match = (lzsa_match *)malloc(nMaxWindowSize * sizeof(lzsa_match));
if (pCompressor->best_match) {
pCompressor->slot_cost = (int *)malloc(nMaxWindowSize * NMATCHES_PER_OFFSET * sizeof(int));
if (pCompressor->slot_cost) {
pCompressor->repmatch_opt = (lzsa_repmatch_opt *)malloc(nMaxWindowSize * sizeof(lzsa_repmatch_opt));
if (pCompressor->repmatch_opt)
return 0;
}
}
}
else {
return 0;
}
}
}
}
}
}
lzsa_compressor_destroy(pCompressor);
return 100;
}
/**
* Clean up compression context and free up any associated resources
*
* @param pCompressor compression context to clean up
*/
void lzsa_compressor_destroy(lsza_compressor *pCompressor) {
divsufsort_destroy(&pCompressor->divsufsort_context);
if (pCompressor->repmatch_opt) {
free(pCompressor->repmatch_opt);
pCompressor->repmatch_opt = NULL;
}
if (pCompressor->slot_cost) {
free(pCompressor->slot_cost);
pCompressor->slot_cost = NULL;
}
if (pCompressor->best_match) {
free(pCompressor->best_match);
pCompressor->best_match = NULL;
}
if (pCompressor->match) {
free(pCompressor->match);
pCompressor->match = NULL;
}
if (pCompressor->open_intervals) {
free(pCompressor->open_intervals);
pCompressor->open_intervals = NULL;
}
if (pCompressor->pos_data) {
free(pCompressor->pos_data);
pCompressor->pos_data = NULL;
}
if (pCompressor->intervals) {
free(pCompressor->intervals);
pCompressor->intervals = NULL;
}
}
/**
* Compress one block of data
*
* @param pCompressor compression context
* @param pInWindow pointer to input data window (previously compressed bytes + bytes to compress)
* @param nPreviousBlockSize number of previously compressed bytes (or 0 for none)
* @param nInDataSize number of input bytes to compress
* @param pOutData pointer to output buffer
* @param nMaxOutDataSize maximum size of output buffer, in bytes
*
* @return size of compressed data in output buffer, or -1 if the data is uncompressible
*/
int lzsa_compressor_shrink_block(lsza_compressor *pCompressor, const unsigned char *pInWindow, const int nPreviousBlockSize, const int nInDataSize, unsigned char *pOutData, const int nMaxOutDataSize) {
if (lzsa_build_suffix_array(pCompressor, pInWindow, nPreviousBlockSize + nInDataSize))
return -1;
if (nPreviousBlockSize) {
lzsa_skip_matches(pCompressor, 0, nPreviousBlockSize);
}
lzsa_find_all_matches(pCompressor, nPreviousBlockSize, nPreviousBlockSize + nInDataSize);
if (pCompressor->format_version == 1) {
return lzsa_optimize_and_write_block_v1(pCompressor, pInWindow, nPreviousBlockSize, nInDataSize, pOutData, nMaxOutDataSize);
}
else if (pCompressor->format_version == 2) {
return lzsa_optimize_and_write_block_v2(pCompressor, pInWindow, nPreviousBlockSize, nInDataSize, pOutData, nMaxOutDataSize);
}
else {
return -1;
}
}
/**
* Get the number of compression commands issued in compressed data blocks
*
* @return number of commands
*/
int lzsa_compressor_get_command_count(lsza_compressor *pCompressor) {
return pCompressor->num_commands;
}
/**
* Decompress one data block
*
* @param pInBlock pointer to compressed data
* @param nInBlockSize size of compressed data, in bytes
* @param pOutData pointer to output decompression buffer (previously decompressed bytes + room for decompressing this block)
* @param nOutDataOffset starting index of where to store decompressed bytes in output buffer (and size of previously decompressed bytes)
* @param nBlockMaxSize total size of output decompression buffer, in bytes
*
* @return size of decompressed data in bytes, or -1 for error
*/
int lzsa_decompressor_expand_block(const int nFormatVersion, const unsigned char *pInBlock, int nBlockSize, unsigned char *pOutData, int nOutDataOffset, int nBlockMaxSize) {
if (nFormatVersion == 1)
return lzsa_decompressor_expand_block_v1(pInBlock, nBlockSize, pOutData, nOutDataOffset, nBlockMaxSize);
else if (nFormatVersion == 2)
return lzsa_decompressor_expand_block_v2(pInBlock, nBlockSize, pOutData, nOutDataOffset, nBlockMaxSize);
else
return -1;
}