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lz4/programs/lz4io.c
Yann Collet 7f436a1215 lz4 cli supports frame content size
2015-03-23 02:20:42 +01:00

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/*
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 <stdio.h> /* fprintf, fopen, fread, stdin, stdout */
#include <stdlib.h> /* malloc, free */
#include <string.h> /* strcmp, strlen */
#include <time.h> /* clock */
#include <sys/types.h> /* stat64 */
#include <sys/stat.h> /* stat64 */
#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 <fcntl.h> /* _O_BINARY */
# include <io.h> /* _setmode, _fileno, _get_osfhandle */
# define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY)
# include <Windows.h> /* 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 int g_contentSizeFlag = 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;
}
/* Default setting : 0 (disabled) */
int LZ4IO_setContentSize(int enable)
{
g_contentSizeFlag = (enable!=0);
return g_contentSizeFlag;
}
static unsigned LZ4IO_GetMilliSpan(clock_t nPrevious)
{
clock_t nCurrent = clock();
unsigned nSpan = (unsigned)(((nCurrent - nPrevious) * 1000) / CLOCKS_PER_SEC);
return nSpan;
}
static unsigned long long LZ4IO_GetFileSize(const char* infilename)
{
int r;
#if defined(_MSC_VER)
struct _stat64 statbuf;
r = _stat64(infilename, &statbuf);
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
#endif
if (r || !S_ISREG(statbuf.st_mode)) return 0; /* No good... */
return (unsigned long long)statbuf.st_size;
}
/* ************************************************************************ **
** ********************** 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;
if (g_contentSizeFlag)
{
unsigned long long fileSize = LZ4IO_GetFileSize(input_filename);
prefs.frameInfo.frameOSize = fileSize; /* == 0 if input == stdin */
}
/* 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<ifntSize; i++)
{
size_t ifnSize = strlen(inFileNamesTable[i]);
if (ofnSize <= ifnSize+suffixSize+1) { free(outFileName); ofnSize = ifnSize + 20; outFileName = (char*)malloc(ofnSize); }
strcpy(outFileName, inFileNamesTable[i]);
strcat(outFileName, suffix);
LZ4IO_compressFilename(inFileNamesTable[i], outFileName, compressionlevel);
}
free(outFileName);
return 0;
}
/* ********************************************************************* */
/* ********************** LZ4 file-stream Decompression **************** */
/* ********************************************************************* */
static unsigned LZ4IO_readLE32 (const void* s)
{
const unsigned char* srcPtr = (const unsigned char*)s;
unsigned value32 = srcPtr[0];
value32 += (srcPtr[1]<<8);
value32 += (srcPtr[2]<<16);
value32 += (srcPtr[3]<<24);
return value32;
}
static unsigned long long decodeLegacyStream(FILE* finput, FILE* foutput)
{
unsigned long long filesize = 0;
char* in_buff;
char* out_buff;
/* Allocate Memory */
in_buff = (char*)malloc(LZ4_compressBound(LEGACY_BLOCKSIZE));
out_buff = (char*)malloc(LEGACY_BLOCKSIZE);
if (!in_buff || !out_buff) EXM_THROW(51, "Allocation error : not enough memory");
/* Main Loop */
while (1)
{
int decodeSize;
size_t sizeCheck;
unsigned int blockSize;
/* Block Size */
sizeCheck = fread(in_buff, 1, 4, finput);
if (sizeCheck==0) break; /* Nothing to read : file read is completed */
blockSize = LZ4IO_readLE32(in_buff); /* Convert to Little Endian */
if (blockSize > 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;
const size_t inBuffSize = 256 KB;
const size_t outBuffSize = 256 KB;
LZ4F_decompressionContext_t ctx;
LZ4F_errorCode_t errorCode;
unsigned storedSkips = 0;
/* init */
errorCode = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION);
if (LZ4F_isError(errorCode)) EXM_THROW(60, "Can't create context : %s", LZ4F_getErrorName(errorCode));
LZ4IO_writeLE32(headerBuff, LZ4IO_MAGICNUMBER); /* regenerated here, as it was already read from finput */
/* Allocate Memory */
inBuff = malloc(256 KB);
outBuff = malloc(256 KB);
if (!inBuff || !outBuff) EXM_THROW(61, "Allocation error : not enough memory");
/* Init feed with magic number (already consumed from FILE) */
{
size_t inSize = 4;
size_t outSize=0;
LZ4IO_writeLE32(inBuff, LZ4IO_MAGICNUMBER);
errorCode = LZ4F_decompress(ctx, outBuff, &outSize, inBuff, &inSize, NULL);
if (LZ4F_isError(errorCode)) EXM_THROW(62, "Header error : %s", LZ4F_getErrorName(errorCode));
}
/* Main Loop */
for (;;)
{
size_t readSize;
size_t pos = 0;
/* Read input */
readSize = fread(inBuff, 1, inBuffSize, finput);
if (!readSize) break; /* empty file or stream */
while (pos < readSize)
{
/* Decode Input (at least partially) */
size_t remaining = readSize - pos;
size_t decodedBytes = outBuffSize;
errorCode = LZ4F_decompress(ctx, outBuff, &decodedBytes, (char*)inBuff+pos, &remaining, NULL);
if (LZ4F_isError(errorCode)) EXM_THROW(66, "Decompression error : %s", LZ4F_getErrorName(errorCode));
pos += remaining;
if (decodedBytes)
{
/* Write Block */
filesize += decodedBytes;
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) /* not all 0s */
{
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;
}
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