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lz4/programs/lz4io.c
Przemyslaw Skibinski 84cedb4632 updated links to LZ4 repository
2016-11-03 15:12:57 +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/lz4/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 */
#if defined(__MINGW32__) && !defined(_POSIX_SOURCE)
# define _POSIX_SOURCE 1 /* disable %llu warnings with MinGW on Windows */
#endif
/*****************************
* Includes
*****************************/
#include <stdio.h> /* fprintf, fopen, fread, stdin, stdout, fflush, getchar */
#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)
# include <fcntl.h> /* _O_BINARY */
# include <io.h> /* _setmode, _fileno, _get_osfhandle */
# if !defined(__DJGPP__)
# define SET_BINARY_MODE(file) { int unused=_setmode(_fileno(file), _O_BINARY); (void)unused; }
# include <windows.h> /* DeviceIoControl, HANDLE, FSCTL_SET_SPARSE */
# include <winioctl.h> /* 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) setmode(fileno(file), O_BINARY)
# define SET_SPARSE_FILE_MODE(file)
# endif
#else
# define SET_BINARY_MODE(file)
# define SET_SPARSE_FILE_MODE(file)
#endif
#if !defined(S_ISREG)
# define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
#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 (((clock_t)(g_time - clock()) > refreshRate) || (g_displayLevel>=4)) \
{ g_time = clock(); DISPLAY(__VA_ARGS__); \
if (g_displayLevel>=4) fflush(stderr); } }
static const clock_t refreshRate = CLOCKS_PER_SEC / 6;
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 = 1;
static int g_contentSizeFlag = 0;
static const int minBlockSizeID = 4;
static const int maxBlockSizeID = 7;
/**************************************
* Exceptions
***************************************/
#ifndef DEBUG
# define DEBUG 0
#endif
#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 LZ4IO_decompressLZ4F
/* ************************************************** */
/* ****************** 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 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; /* failure, or is not a regular file */
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 LZ4IO_getFiles(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 ( *pfinput==0 ) {
DISPLAYLEVEL(1, "Unable to access file for processing: %s \n", input_filename);
return 1;
}
if (!strcmp (output_filename, stdoutmark)) {
DISPLAYLEVEL(4,"Using stdout for output \n");
*pfoutput = stdout;
SET_BINARY_MODE(stdout);
if (g_sparseFileSupport==1) {
g_sparseFileSupport = 0;
DISPLAYLEVEL(4, "Sparse File Support is automatically disabled on stdout ; try --sparse \n");
}
} 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) {
int ch = 'Y';
DISPLAYLEVEL(2, "Warning : %s already exists\n", output_filename);
if ((g_displayLevel <= 1) || (*pfinput == stdin))
EXM_THROW(11, "Operation aborted : %s already exists", output_filename); /* No interaction possible */
DISPLAYLEVEL(2, "Overwrite ? (Y/n) : ");
while((ch = getchar()) != '\n' && ch != EOF) /* flush integrated */
if ((ch!='Y') && (ch!='y')) EXM_THROW(12, "No. Operation aborted : %s already exists", output_filename);
}
}
*pfoutput = fopen( output_filename, "wb" );
}
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);
}
static int LZ4IO_LZ4_compress(const char* src, char* dst, int srcSize, int dstSize, int cLevel)
{
(void)cLevel;
return LZ4_compress_fast(src, dst, srcSize, dstSize, 1);
}
/* 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* src, char* dst, int srcSize, int dstSize, int cLevel);
unsigned long long filesize = 0;
unsigned long long compressedfilesize = MAGICNUMBER_SIZE;
char* in_buff;
char* out_buff;
const int outBuffSize = LZ4_compressBound(LEGACY_BLOCKSIZE);
FILE* finput;
FILE* foutput;
clock_t end;
/* Init */
clock_t const start = clock();
if (compressionlevel < 3) compressionFunction = LZ4IO_LZ4_compress; else compressionFunction = LZ4_compress_HC;
if (LZ4IO_getFiles(input_filename, output_filename, &finput, &foutput))
EXM_THROW(20, "File error");
/* Allocate Memory */
in_buff = (char*)malloc(LEGACY_BLOCKSIZE);
out_buff = (char*)malloc(outBuffSize);
if (!in_buff || !out_buff) EXM_THROW(21, "Allocation error : not enough memory");
/* Write Archive Header */
LZ4IO_writeLE32(out_buff, LEGACY_MAGICNUMBER);
{ size_t const 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 const 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, outBuffSize, compressionlevel);
compressedfilesize += outSize+4;
DISPLAYUPDATE(2, "\rRead : %i MB ==> %.2f%% ", (int)(filesize>>20), (double)compressedfilesize/filesize*100);
/* Write Block */
LZ4IO_writeLE32(out_buff, outSize);
{ size_t const 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();
if (end==start) end+=1; /* avoid division by zero (speed) */
filesize += !filesize; /* avoid division by zero (ratio) */
DISPLAYLEVEL(2, "\r%79s\r", ""); /* blank line */
DISPLAYLEVEL(2,"Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
filesize, compressedfilesize, (double)compressedfilesize / filesize * 100);
{ double const 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
*********************************************/
typedef struct {
void* srcBuffer;
size_t srcBufferSize;
void* dstBuffer;
size_t dstBufferSize;
LZ4F_compressionContext_t ctx;
} cRess_t;
static cRess_t LZ4IO_createCResources(void)
{
const size_t blockSize = (size_t)LZ4IO_GetBlockSize_FromBlockId (g_blockSizeId);
cRess_t ress;
LZ4F_errorCode_t const errorCode = LZ4F_createCompressionContext(&(ress.ctx), LZ4F_VERSION);
if (LZ4F_isError(errorCode)) EXM_THROW(30, "Allocation error : can't create LZ4F context : %s", LZ4F_getErrorName(errorCode));
/* Allocate Memory */
ress.srcBuffer = malloc(blockSize);
ress.srcBufferSize = blockSize;
ress.dstBufferSize = LZ4F_compressFrameBound(blockSize, NULL); /* cover worst case */
ress.dstBuffer = malloc(ress.dstBufferSize);
if (!ress.srcBuffer || !ress.dstBuffer) EXM_THROW(31, "Allocation error : not enough memory");
return ress;
}
static void LZ4IO_freeCResources(cRess_t ress)
{
free(ress.srcBuffer);
free(ress.dstBuffer);
{ LZ4F_errorCode_t const errorCode = LZ4F_freeCompressionContext(ress.ctx);
if (LZ4F_isError(errorCode)) EXM_THROW(38, "Error : can't free LZ4F context resource : %s", LZ4F_getErrorName(errorCode)); }
}
/*
* LZ4IO_compressFilename_extRess()
* result : 0 : compression completed correctly
* 1 : missing or pb opening srcFileName
*/
static int LZ4IO_compressFilename_extRess(cRess_t ress, const char* srcFileName, const char* dstFileName, int compressionLevel)
{
unsigned long long filesize = 0;
unsigned long long compressedfilesize = 0;
FILE* srcFile;
FILE* dstFile;
void* const srcBuffer = ress.srcBuffer;
void* const dstBuffer = ress.dstBuffer;
const size_t dstBufferSize = ress.dstBufferSize;
const size_t blockSize = (size_t)LZ4IO_GetBlockSize_FromBlockId (g_blockSizeId);
size_t headerSize, readSize;
LZ4F_compressionContext_t ctx = ress.ctx; /* just a pointer */
LZ4F_preferences_t prefs;
/* Init */
memset(&prefs, 0, sizeof(prefs));
/* File check */
if (LZ4IO_getFiles(srcFileName, dstFileName, &srcFile, &dstFile)) return 1;
/* Set compression parameters */
prefs.autoFlush = 1;
prefs.compressionLevel = compressionLevel;
prefs.frameInfo.blockMode = (LZ4F_blockMode_t)g_blockIndependence;
prefs.frameInfo.blockSizeID = (LZ4F_blockSizeID_t)g_blockSizeId;
prefs.frameInfo.contentChecksumFlag = (LZ4F_contentChecksum_t)g_streamChecksum;
if (g_contentSizeFlag) {
unsigned long long const fileSize = LZ4IO_GetFileSize(srcFileName);
prefs.frameInfo.contentSize = fileSize; /* == 0 if input == stdin */
if (fileSize==0)
DISPLAYLEVEL(3, "Warning : cannot determine input content size \n");
}
/* read first block */
readSize = fread(srcBuffer, (size_t)1, blockSize, srcFile);
filesize += readSize;
/* single-block file */
if (readSize < blockSize) {
/* Compress in single pass */
size_t const cSize = LZ4F_compressFrame(dstBuffer, dstBufferSize, srcBuffer, readSize, &prefs);
if (LZ4F_isError(cSize)) EXM_THROW(34, "Compression failed : %s", LZ4F_getErrorName(cSize));
compressedfilesize = cSize;
DISPLAYUPDATE(2, "\rRead : %u MB ==> %.2f%% ",
(unsigned)(filesize>>20), (double)compressedfilesize/(filesize+!filesize)*100); /* avoid division by zero */
/* Write Block */
{ size_t const sizeCheck = fwrite(dstBuffer, 1, cSize, dstFile);
if (sizeCheck!=cSize) EXM_THROW(35, "Write error : cannot write compressed block");
} }
else
/* multiple-blocks file */
{
/* Write Archive Header */
headerSize = LZ4F_compressBegin(ctx, dstBuffer, dstBufferSize, &prefs);
if (LZ4F_isError(headerSize)) EXM_THROW(32, "File header generation failed : %s", LZ4F_getErrorName(headerSize));
{ size_t const sizeCheck = fwrite(dstBuffer, 1, headerSize, dstFile);
if (sizeCheck!=headerSize) EXM_THROW(33, "Write error : cannot write header"); }
compressedfilesize += headerSize;
/* Main Loop */
while (readSize>0) {
size_t outSize;
/* Compress Block */
outSize = LZ4F_compressUpdate(ctx, dstBuffer, dstBufferSize, srcBuffer, readSize, NULL);
if (LZ4F_isError(outSize)) EXM_THROW(34, "Compression failed : %s", LZ4F_getErrorName(outSize));
compressedfilesize += outSize;
DISPLAYUPDATE(2, "\rRead : %u MB ==> %.2f%% ", (unsigned)(filesize>>20), (double)compressedfilesize/filesize*100);
/* Write Block */
{ size_t const sizeCheck = fwrite(dstBuffer, 1, outSize, dstFile);
if (sizeCheck!=outSize) EXM_THROW(35, "Write error : cannot write compressed block"); }
/* Read next block */
readSize = fread(srcBuffer, (size_t)1, (size_t)blockSize, srcFile);
filesize += readSize;
}
/* End of Stream mark */
headerSize = LZ4F_compressEnd(ctx, dstBuffer, dstBufferSize, NULL);
if (LZ4F_isError(headerSize)) EXM_THROW(36, "End of file generation failed : %s", LZ4F_getErrorName(headerSize));
{ size_t const sizeCheck = fwrite(dstBuffer, 1, headerSize, dstFile);
if (sizeCheck!=headerSize) EXM_THROW(37, "Write error : cannot write end of stream"); }
compressedfilesize += headerSize;
}
/* Release files */
fclose (srcFile);
fclose (dstFile);
/* Final Status */
DISPLAYLEVEL(2, "\r%79s\r", "");
DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
filesize, compressedfilesize, (double)compressedfilesize/(filesize + !filesize)*100); /* avoid division by zero */
return 0;
}
int LZ4IO_compressFilename(const char* srcFileName, const char* dstFileName, int compressionLevel)
{
clock_t const start = clock();
cRess_t const ress = LZ4IO_createCResources();
int const issueWithSrcFile = LZ4IO_compressFilename_extRess(ress, srcFileName, dstFileName, compressionLevel);
/* Free resources */
LZ4IO_freeCResources(ress);
/* Final Status */
{ clock_t const end = clock();
double const seconds = (double)(end - start) / CLOCKS_PER_SEC;
DISPLAYLEVEL(4, "Completed in %.2f sec \n", seconds);
}
return issueWithSrcFile;
}
#define FNSPACE 30
int LZ4IO_compressMultipleFilenames(const char** inFileNamesTable, int ifntSize, const char* suffix, int compressionLevel)
{
int i;
int missed_files = 0;
char* dstFileName = (char*)malloc(FNSPACE);
size_t ofnSize = FNSPACE;
const size_t suffixSize = strlen(suffix);
cRess_t const ress = LZ4IO_createCResources();
/* loop on each file */
for (i=0; i<ifntSize; i++) {
size_t const ifnSize = strlen(inFileNamesTable[i]);
if (ofnSize <= ifnSize+suffixSize+1) { free(dstFileName); ofnSize = ifnSize + 20; dstFileName = (char*)malloc(ofnSize); }
strcpy(dstFileName, inFileNamesTable[i]);
strcat(dstFileName, suffix);
missed_files += LZ4IO_compressFilename_extRess(ress, inFileNamesTable[i], dstFileName, compressionLevel);
}
/* Close & Free */
LZ4IO_freeCResources(ress);
free(dstFileName);
return missed_files;
}
/* ********************************************************************* */
/* ********************** LZ4 file-stream Decompression **************** */
/* ********************************************************************* */
static unsigned LZ4IO_readLE32 (const void* s)
{
const unsigned char* const srcPtr = (const unsigned char*)s;
unsigned value32 = srcPtr[0];
value32 += (srcPtr[1]<<8);
value32 += (srcPtr[2]<<16);
value32 += ((unsigned)srcPtr[3])<<24;
return value32;
}
static unsigned LZ4IO_fwriteSparse(FILE* file, const void* buffer, size_t bufferSize, unsigned storedSkips)
{
const size_t* const bufferT = (const size_t*)buffer; /* Buffer is supposed malloc'ed, hence aligned on size_t */
const size_t* ptrT = bufferT;
size_t bufferSizeT = bufferSize / sizeT;
const size_t* const bufferTEnd = bufferT + bufferSizeT;
static const size_t segmentSizeT = (32 KB) / sizeT;
if (!g_sparseFileSupport) { /* normal write */
size_t const sizeCheck = fwrite(buffer, 1, bufferSize, file);
if (sizeCheck != bufferSize) EXM_THROW(70, "Write error : cannot write decoded block");
return 0;
}
/* avoid int overflow */
if (storedSkips > 1 GB) {
int const seekResult = fseek(file, 1 GB, SEEK_CUR);
if (seekResult != 0) EXM_THROW(71, "1 GB skip error (sparse file support)");
storedSkips -= 1 GB;
}
while (ptrT < bufferTEnd) {
size_t seg0SizeT = segmentSizeT;
size_t nb0T;
/* count leading zeros */
if (seg0SizeT > bufferSizeT) seg0SizeT = bufferSizeT;
bufferSizeT -= seg0SizeT;
for (nb0T=0; (nb0T < seg0SizeT) && (ptrT[nb0T] == 0); nb0T++) ;
storedSkips += (unsigned)(nb0T * sizeT);
if (nb0T != seg0SizeT) { /* not all 0s */
int const seekResult = fseek(file, storedSkips, SEEK_CUR);
if (seekResult) EXM_THROW(72, "Sparse skip error ; try --no-sparse");
storedSkips = 0;
seg0SizeT -= nb0T;
ptrT += nb0T;
{ size_t const sizeCheck = fwrite(ptrT, sizeT, seg0SizeT, file);
if (sizeCheck != seg0SizeT) EXM_THROW(73, "Write error : cannot write decoded block");
} }
ptrT += seg0SizeT;
}
if (bufferSize & maskT) { /* size not multiple of sizeT : implies end of block */
const char* const restStart = (const char*)bufferTEnd;
const char* restPtr = restStart;
size_t const restSize = bufferSize & maskT;
const char* const restEnd = restStart + restSize;
for (; (restPtr < restEnd) && (*restPtr == 0); restPtr++) ;
storedSkips += (unsigned) (restPtr - restStart);
if (restPtr != restEnd) {
int const seekResult = fseek(file, storedSkips, SEEK_CUR);
if (seekResult) EXM_THROW(74, "Sparse skip error ; try --no-sparse");
storedSkips = 0;
{ size_t const sizeCheck = fwrite(restPtr, 1, restEnd - restPtr, file);
if (sizeCheck != (size_t)(restEnd - restPtr)) EXM_THROW(75, "Write error : cannot write decoded end of block");
} }
}
return storedSkips;
}
static void LZ4IO_fwriteSparseEnd(FILE* file, unsigned storedSkips)
{
if (storedSkips>0) { /* implies g_sparseFileSupport */
int const seekResult = fseek(file, storedSkips-1, SEEK_CUR);
if (seekResult != 0) EXM_THROW(69, "Final skip error (sparse file)\n");
{ const char lastZeroByte[1] = { 0 };
size_t const sizeCheck = fwrite(lastZeroByte, 1, 1, file);
if (sizeCheck != 1) EXM_THROW(69, "Write error : cannot write last zero\n");
} }
}
static unsigned g_magicRead = 0;
static unsigned long long LZ4IO_decodeLegacyStream(FILE* finput, FILE* foutput)
{
unsigned long long filesize = 0;
char* in_buff;
char* out_buff;
unsigned storedSkips = 0;
/* 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;
unsigned int blockSize;
/* Block Size */
{ size_t const sizeCheck = fread(in_buff, 1, 4, finput);
if (sizeCheck == 0) break; /* Nothing to read : file read is completed */
if (sizeCheck != 4) EXM_THROW(52, "Read error : cannot access block size "); }
blockSize = LZ4IO_readLE32(in_buff); /* Convert to Little Endian */
if (blockSize > LZ4_COMPRESSBOUND(LEGACY_BLOCKSIZE)) {
/* Cannot read next block : maybe new stream ? */
g_magicRead = blockSize;
break;
}
/* Read Block */
{ size_t const 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 */
storedSkips = LZ4IO_fwriteSparse(foutput, out_buff, decodeSize, storedSkips);
}
LZ4IO_fwriteSparseEnd(foutput, storedSkips);
/* Free */
free(in_buff);
free(out_buff);
return filesize;
}
typedef struct {
void* srcBuffer;
size_t srcBufferSize;
void* dstBuffer;
size_t dstBufferSize;
LZ4F_decompressionContext_t dCtx;
} dRess_t;
static const size_t LZ4IO_dBufferSize = 64 KB;
static dRess_t LZ4IO_createDResources(void)
{
dRess_t ress;
/* init */
LZ4F_errorCode_t const errorCode = LZ4F_createDecompressionContext(&ress.dCtx, LZ4F_VERSION);
if (LZ4F_isError(errorCode)) EXM_THROW(60, "Can't create LZ4F context : %s", LZ4F_getErrorName(errorCode));
/* Allocate Memory */
ress.srcBufferSize = LZ4IO_dBufferSize;
ress.srcBuffer = malloc(ress.srcBufferSize);
ress.dstBufferSize = LZ4IO_dBufferSize;
ress.dstBuffer = malloc(ress.dstBufferSize);
if (!ress.srcBuffer || !ress.dstBuffer) EXM_THROW(61, "Allocation error : not enough memory");
return ress;
}
static void LZ4IO_freeDResources(dRess_t ress)
{
LZ4F_errorCode_t errorCode = LZ4F_freeDecompressionContext(ress.dCtx);
if (LZ4F_isError(errorCode)) EXM_THROW(69, "Error : can't free LZ4F context resource : %s", LZ4F_getErrorName(errorCode));
free(ress.srcBuffer);
free(ress.dstBuffer);
}
static unsigned long long LZ4IO_decompressLZ4F(dRess_t ress, FILE* srcFile, FILE* dstFile)
{
unsigned long long filesize = 0;
LZ4F_errorCode_t nextToLoad;
unsigned storedSkips = 0;
/* Init feed with magic number (already consumed from FILE* sFile) */
{ size_t inSize = MAGICNUMBER_SIZE;
size_t outSize= 0;
LZ4IO_writeLE32(ress.srcBuffer, LZ4IO_MAGICNUMBER);
nextToLoad = LZ4F_decompress(ress.dCtx, ress.dstBuffer, &outSize, ress.srcBuffer, &inSize, NULL);
if (LZ4F_isError(nextToLoad)) EXM_THROW(62, "Header error : %s", LZ4F_getErrorName(nextToLoad));
}
/* Main Loop */
for (;nextToLoad;) {
size_t readSize;
size_t pos = 0;
size_t decodedBytes = ress.dstBufferSize;
/* Read input */
if (nextToLoad > ress.srcBufferSize) nextToLoad = ress.srcBufferSize;
readSize = fread(ress.srcBuffer, 1, nextToLoad, srcFile);
if (!readSize) break; /* reached end of file or stream */
while ((pos < readSize) || (decodedBytes == ress.dstBufferSize)) { /* still to read, or still to flush */
/* Decode Input (at least partially) */
size_t remaining = readSize - pos;
decodedBytes = ress.dstBufferSize;
nextToLoad = LZ4F_decompress(ress.dCtx, ress.dstBuffer, &decodedBytes, (char*)(ress.srcBuffer)+pos, &remaining, NULL);
if (LZ4F_isError(nextToLoad)) EXM_THROW(66, "Decompression error : %s", LZ4F_getErrorName(nextToLoad));
pos += remaining;
/* Write Block */
if (decodedBytes) {
storedSkips = LZ4IO_fwriteSparse(dstFile, ress.dstBuffer, decodedBytes, storedSkips);
filesize += decodedBytes;
DISPLAYUPDATE(2, "\rDecompressed : %u MB ", (unsigned)(filesize>>20));
}
if (!nextToLoad) break;
}
}
LZ4IO_fwriteSparseEnd(dstFile, storedSkips);
if (nextToLoad!=0) EXM_THROW(67, "Unfinished stream");
return filesize;
}
#define PTSIZE (64 KB)
#define PTSIZET (PTSIZE / sizeof(size_t))
static unsigned long long LZ4IO_passThrough(FILE* finput, FILE* foutput, unsigned char MNstore[MAGICNUMBER_SIZE])
{
size_t buffer[PTSIZET];
size_t read = 1;
unsigned long long total = MAGICNUMBER_SIZE;
unsigned storedSkips = 0;
size_t const sizeCheck = fwrite(MNstore, 1, MAGICNUMBER_SIZE, foutput);
if (sizeCheck != MAGICNUMBER_SIZE) EXM_THROW(50, "Pass-through write error");
while (read) {
read = fread(buffer, 1, PTSIZE, finput);
total += read;
storedSkips = LZ4IO_fwriteSparse(foutput, buffer, read, storedSkips);
}
LZ4IO_fwriteSparseEnd(foutput, storedSkips);
return total;
}
/** Safely handle cases when (unsigned)offset > LONG_MAX */
static int fseek_u32(FILE *fp, unsigned offset, int where)
{
const unsigned stepMax = 1U << 30;
int errorNb = 0;
if (where != SEEK_CUR) return -1; /* Only allows SEEK_CUR */
while (offset > 0) {
unsigned s = offset;
if (s > stepMax) s = stepMax;
errorNb = fseek(fp, (long) s, SEEK_CUR);
if (errorNb != 0) break;
offset -= s;
}
return errorNb;
}
#define ENDOFSTREAM ((unsigned long long)-1)
static unsigned long long selectDecoder(dRess_t ress, FILE* finput, FILE* foutput)
{
unsigned char MNstore[MAGICNUMBER_SIZE];
unsigned magicNumber;
static unsigned nbCalls = 0;
/* init */
nbCalls++;
/* Check Archive Header */
if (g_magicRead) { /* magic number already read from finput (see legacy frame)*/
magicNumber = g_magicRead;
g_magicRead = 0;
} else {
size_t const nbReadBytes = fread(MNstore, 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(MNstore); /* Little Endian format */
}
if (LZ4IO_isSkippableMagicNumber(magicNumber)) magicNumber = LZ4IO_SKIPPABLE0; /* fold skippable magic numbers */
switch(magicNumber)
{
case LZ4IO_MAGICNUMBER:
return LZ4IO_decompressLZ4F(ress, finput, foutput);
case LEGACY_MAGICNUMBER:
DISPLAYLEVEL(4, "Detected : Legacy format \n");
return LZ4IO_decodeLegacyStream(finput, foutput);
case LZ4IO_SKIPPABLE0:
DISPLAYLEVEL(4, "Skipping detected skippable area \n");
{ size_t const nbReadBytes = fread(MNstore, 1, 4, finput);
if (nbReadBytes != 4) EXM_THROW(42, "Stream error : skippable size unreadable"); }
{ unsigned const size = LZ4IO_readLE32(MNstore); /* Little Endian format */
int const errorNb = fseek_u32(finput, size, SEEK_CUR);
if (errorNb != 0) EXM_THROW(43, "Stream error : cannot skip skippable area"); }
return 0;
EXTENDED_FORMAT; /* macro extension for custom formats */
default:
if (nbCalls == 1) { /* just started */
if (g_overwrite)
return LZ4IO_passThrough(finput, foutput, MNstore);
EXM_THROW(44,"Unrecognized header : file cannot be decoded"); /* Wrong magic number at the beginning of 1st stream */
}
DISPLAYLEVEL(2, "Stream followed by undecodable data\n");
return ENDOFSTREAM;
}
}
static int LZ4IO_decompressFile_extRess(dRess_t ress, const char* input_filename, const char* output_filename)
{
unsigned long long filesize = 0, decodedSize=0;
FILE* finput;
FILE* foutput;
/* Init */
if (LZ4IO_getFiles(input_filename, output_filename, &finput, &foutput))
return 1;
/* sparse file */
if (g_sparseFileSupport) { SET_SPARSE_FILE_MODE(foutput); }
/* Loop over multiple streams */
do {
decodedSize = selectDecoder(ress, finput, foutput);
if (decodedSize != ENDOFSTREAM)
filesize += decodedSize;
} while (decodedSize != ENDOFSTREAM);
/* Final Status */
DISPLAYLEVEL(2, "\r%79s\r", "");
DISPLAYLEVEL(2, "Successfully decoded %llu bytes \n", filesize);
/* Close */
fclose(finput);
fclose(foutput);
return 0;
}
int LZ4IO_decompressFilename(const char* input_filename, const char* output_filename)
{
dRess_t const ress = LZ4IO_createDResources();
clock_t const start = clock();
int const missingFiles = LZ4IO_decompressFile_extRess(ress, input_filename, output_filename);
{ clock_t const end = clock();
double const seconds = (double)(end - start) / CLOCKS_PER_SEC;
DISPLAYLEVEL(4, "Done in %.2f sec \n", seconds);
}
LZ4IO_freeDResources(ress);
return missingFiles;
}
#define MAXSUFFIXSIZE 8
int LZ4IO_decompressMultipleFilenames(const char** inFileNamesTable, int ifntSize, const char* suffix)
{
int i;
int skippedFiles = 0;
int missingFiles = 0;
char* outFileName = (char*)malloc(FNSPACE);
size_t ofnSize = FNSPACE;
size_t const suffixSize = strlen(suffix);
dRess_t const ress = LZ4IO_createDResources();
if (outFileName==NULL) exit(1); /* not enough memory */
for (i=0; i<ifntSize; i++) {
size_t const ifnSize = strlen(inFileNamesTable[i]);
const char* const suffixPtr = inFileNamesTable[i] + ifnSize - suffixSize;
if (ofnSize <= ifnSize-suffixSize+1) { free(outFileName); ofnSize = ifnSize + 20; outFileName = (char*)malloc(ofnSize); if (outFileName==NULL) exit(1); }
if (ifnSize <= suffixSize || strcmp(suffixPtr, suffix) != 0) {
DISPLAYLEVEL(1, "File extension doesn't match expected LZ4_EXTENSION (%4s); will not process file: %s\n", suffix, inFileNamesTable[i]);
skippedFiles++;
continue;
}
memcpy(outFileName, inFileNamesTable[i], ifnSize - suffixSize);
outFileName[ifnSize-suffixSize] = '\0';
missingFiles += LZ4IO_decompressFile_extRess(ress, inFileNamesTable[i], outFileName);
}
LZ4IO_freeDResources(ress);
free(outFileName);
return missingFiles + skippedFiles;
}
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