mirror of
https://github.com/emmanuel-marty/lzsa.git
synced 2024-11-26 02:49:19 +00:00
Remove file after restructuring
This commit is contained in:
Emmanuel Marty
GitHub
parent
b4e3c07d3a
commit
47315447fd
218
src/expand_v1.c
218
src/expand_v1.c
@ -1,218 +0,0 @@
|
||||
/*
|
||||
* expand_v1.c - LZSA1 block decompressor 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 "format.h"
|
||||
#include "expand_v1.h"
|
||||
|
||||
#ifdef _MSC_VER
|
||||
#define FORCE_INLINE __forceinline
|
||||
#else /* _MSC_VER */
|
||||
#define FORCE_INLINE __attribute__((always_inline))
|
||||
#endif /* _MSC_VER */
|
||||
|
||||
static inline FORCE_INLINE int lzsa_build_literals_len_v1(const unsigned char **ppInBlock, const unsigned char *pInBlockEnd, unsigned int *nLiterals) {
|
||||
unsigned int nByte;
|
||||
const unsigned char *pInBlock = *ppInBlock;
|
||||
|
||||
if (pInBlock < pInBlockEnd) {
|
||||
nByte = *pInBlock++;
|
||||
(*nLiterals) += nByte;
|
||||
|
||||
if (nByte == 250) {
|
||||
if (pInBlock < pInBlockEnd) {
|
||||
(*nLiterals) = 256 + ((unsigned int)*pInBlock++);
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
else if (nByte == 249) {
|
||||
if ((pInBlock + 1) < pInBlockEnd) {
|
||||
(*nLiterals) = ((unsigned int)*pInBlock++);
|
||||
(*nLiterals) |= (((unsigned int)*pInBlock++) << 8);
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
*ppInBlock = pInBlock;
|
||||
return 0;
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
static inline FORCE_INLINE int lzsa_build_match_len_v1(const unsigned char **ppInBlock, const unsigned char *pInBlockEnd, unsigned int *nMatchLen) {
|
||||
unsigned int nByte;
|
||||
const unsigned char *pInBlock = *ppInBlock;
|
||||
|
||||
if (pInBlock < pInBlockEnd) {
|
||||
nByte = *pInBlock++;
|
||||
(*nMatchLen) += nByte;
|
||||
|
||||
if (nByte == 239) {
|
||||
if (pInBlock < pInBlockEnd) {
|
||||
(*nMatchLen) = 256 + ((unsigned int)*pInBlock++);
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
else if (nByte == 238) {
|
||||
if ((pInBlock + 1) < pInBlockEnd) {
|
||||
(*nMatchLen) = ((unsigned int)*pInBlock++);
|
||||
(*nMatchLen) |= (((unsigned int)*pInBlock++) << 8);
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
*ppInBlock = pInBlock;
|
||||
return 0;
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Decompress one LZSA1 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_v1(const unsigned char *pInBlock, int nBlockSize, unsigned char *pOutData, int nOutDataOffset, int nBlockMaxSize) {
|
||||
const unsigned char *pInBlockEnd = pInBlock + nBlockSize;
|
||||
unsigned char *pCurOutData = pOutData + nOutDataOffset;
|
||||
const unsigned char *pOutDataEnd = pCurOutData + nBlockMaxSize;
|
||||
const unsigned char *pOutDataFastEnd = pOutDataEnd - 18;
|
||||
|
||||
while (pInBlock < pInBlockEnd) {
|
||||
const unsigned char token = *pInBlock++;
|
||||
unsigned int nLiterals = (unsigned int)((token & 0x70) >> 4);
|
||||
|
||||
if (nLiterals != LITERALS_RUN_LEN_V1 && (pInBlock + 8) <= pInBlockEnd && pCurOutData < pOutDataFastEnd) {
|
||||
memcpy(pCurOutData, pInBlock, 8);
|
||||
pInBlock += nLiterals;
|
||||
pCurOutData += nLiterals;
|
||||
}
|
||||
else {
|
||||
if (nLiterals == LITERALS_RUN_LEN_V1) {
|
||||
if (lzsa_build_literals_len_v1(&pInBlock, pInBlockEnd, &nLiterals))
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (nLiterals != 0) {
|
||||
if ((pInBlock + nLiterals) <= pInBlockEnd &&
|
||||
(pCurOutData + nLiterals) <= pOutDataEnd) {
|
||||
memcpy(pCurOutData, pInBlock, nLiterals);
|
||||
pInBlock += nLiterals;
|
||||
pCurOutData += nLiterals;
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if ((pInBlock + 1) < pInBlockEnd) { /* The last token in the block does not include match information */
|
||||
unsigned int nMatchOffset;
|
||||
|
||||
nMatchOffset = ((unsigned int)(*pInBlock++)) ^ 0xff;
|
||||
if (token & 0x80) {
|
||||
nMatchOffset |= (((unsigned int)(*pInBlock++)) << 8) ^ 0xff00;
|
||||
}
|
||||
nMatchOffset++;
|
||||
|
||||
const unsigned char *pSrc = pCurOutData - nMatchOffset;
|
||||
if (pSrc >= pOutData) {
|
||||
unsigned int nMatchLen = (unsigned int)(token & 0x0f);
|
||||
if (nMatchLen != MATCH_RUN_LEN_V1 && nMatchOffset >= 8 && pCurOutData < pOutDataFastEnd) {
|
||||
memcpy(pCurOutData, pSrc, 8);
|
||||
memcpy(pCurOutData + 8, pSrc + 8, 8);
|
||||
memcpy(pCurOutData + 16, pSrc + 16, 2);
|
||||
pCurOutData += (MIN_MATCH_SIZE_V1 + nMatchLen);
|
||||
}
|
||||
else {
|
||||
nMatchLen += MIN_MATCH_SIZE_V1;
|
||||
if (nMatchLen == (MATCH_RUN_LEN_V1 + MIN_MATCH_SIZE_V1)) {
|
||||
if (lzsa_build_match_len_v1(&pInBlock, pInBlockEnd, &nMatchLen))
|
||||
return -1;
|
||||
}
|
||||
|
||||
if ((pCurOutData + nMatchLen) <= pOutDataEnd) {
|
||||
/* Do a deterministic, left to right byte copy instead of memcpy() so as to handle overlaps */
|
||||
|
||||
if (nMatchOffset >= 16 && (pCurOutData + nMatchLen) < (pOutDataFastEnd - 15)) {
|
||||
const unsigned char *pCopySrc = pSrc;
|
||||
unsigned char *pCopyDst = pCurOutData;
|
||||
const unsigned char *pCopyEndDst = pCurOutData + nMatchLen;
|
||||
|
||||
do {
|
||||
memcpy(pCopyDst, pCopySrc, 16);
|
||||
pCopySrc += 16;
|
||||
pCopyDst += 16;
|
||||
} while (pCopyDst < pCopyEndDst);
|
||||
|
||||
pCurOutData += nMatchLen;
|
||||
}
|
||||
else {
|
||||
while (nMatchLen) {
|
||||
*pCurOutData++ = *pSrc++;
|
||||
nMatchLen--;
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return (int)(pCurOutData - (pOutData + nOutDataOffset));
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user