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lz4/programs/lz4io.c

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/*
LZ4io.c - LZ4 File/Stream Interface
Copyright (C) Yann Collet 2011-2014
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 : http://code.google.com/p/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 FORCE_INLINE static __forceinline
# define _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_DEPRECATE // VS2005
# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant
#else
# ifdef __GNUC__
# define FORCE_INLINE static inline __attribute__((always_inline))
# else
# define FORCE_INLINE static inline
# endif
#endif
#define _LARGE_FILES // Large file support on 32-bits AIX
#define _FILE_OFFSET_BITS 64 // Large file support on 32-bits unix
#define _POSIX_SOURCE 1 // for fileno() within <stdio.h> on unix
//****************************
// Includes
//****************************
#include <stdio.h> // fprintf, fopen, fread, _fileno, stdin, stdout
#include <stdlib.h> // malloc
#include <string.h> // strcmp, strlen
#include <time.h> // clock
#include "lz4io.h"
#include "lz4.h"
#include "lz4hc.h"
#include "xxhash.h"
//****************************
// OS-specific Includes
//****************************
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
# include <fcntl.h> // _O_BINARY
# include <io.h> // _setmode, _isatty
# ifdef __MINGW32__
int _fileno(FILE *stream); // MINGW somehow forgets to include this windows declaration into <stdio.h>
# endif
# define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY)
# define IS_CONSOLE(stdStream) _isatty(_fileno(stdStream))
#else
# include <unistd.h> // isatty
# define SET_BINARY_MODE(file)
# define IS_CONSOLE(stdStream) isatty(fileno(stdStream))
#endif
//**************************************
// Compiler-specific functions
//**************************************
#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
#if defined(_MSC_VER) // Visual Studio
# define swap32 _byteswap_ulong
#elif GCC_VERSION >= 403
# define swap32 __builtin_bswap32
#else
static inline unsigned int swap32(unsigned int x)
{
return ((x << 24) & 0xff000000 ) |
((x << 8) & 0x00ff0000 ) |
((x >> 8) & 0x0000ff00 ) |
((x >> 24) & 0x000000ff );
}
#endif
//****************************
// Constants
//****************************
#define KB *(1U<<10)
#define MB *(1U<<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 LZ4S_MAGICNUMBER 0x184D2204
#define LZ4S_SKIPPABLE0 0x184D2A50
#define LZ4S_SKIPPABLEMASK 0xFFFFFFF0
#define LEGACY_MAGICNUMBER 0x184C2102
#define CACHELINE 64
#define LEGACY_BLOCKSIZE (8 MB)
#define MIN_STREAM_BUFSIZE (192 KB)
#define LZ4S_BLOCKSIZEID_DEFAULT 7
#define LZ4S_CHECKSUM_SEED 0
#define LZ4S_EOS 0
#define LZ4S_MAXHEADERSIZE (MAGICNUMBER_SIZE+2+8+4+1)
//**************************************
// Architecture Macros
//**************************************
static const int one = 1;
#define CPU_LITTLE_ENDIAN (*(char*)(&one))
#define CPU_BIG_ENDIAN (!CPU_LITTLE_ENDIAN)
#define LITTLE_ENDIAN_32(i) (CPU_LITTLE_ENDIAN?(i):swap32(i))
//**************************************
// Macros
//**************************************
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (displayLevel>=l) { DISPLAY(__VA_ARGS__); }
//**************************************
// Local Parameters
//**************************************
static int displayLevel = 0; // 0 : no display // 1: errors // 2 : + result + interaction + warnings ; // 3 : + progression; // 4 : + information
static int overwrite = 1;
static int globalBlockSizeId = LZ4S_BLOCKSIZEID_DEFAULT;
static int blockChecksum = 0;
static int streamChecksum = 1;
static int blockIndependence = 1;
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_COMPRESSOR compress_file
#define DEFAULT_DECOMPRESSOR decodeLZ4S
/* ************************************************** */
/* ****************** Parameters ******************** */
/* ************************************************** */
/* Default setting : overwrite = 1; return : overwrite mode (0/1) */
int LZ4IO_setOverwrite(int yes)
{
overwrite = (yes!=0);
return 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;
globalBlockSizeId = bsid;
return blockSizeTable[globalBlockSizeId-minBlockSizeID];
}
int LZ4IO_setBlockMode(blockMode_t blockMode)
{
blockIndependence = (blockMode == independentBlocks);
return blockIndependence;
}
/* Default setting : no checksum */
int LZ4IO_setBlockChecksumMode(int xxhash)
{
blockChecksum = (xxhash != 0);
return blockChecksum;
}
/* Default setting : checksum enabled */
int LZ4IO_setStreamChecksumMode(int xxhash)
{
streamChecksum = (xxhash != 0);
return streamChecksum;
}
/* Default setting : 0 (no notification) */
int LZ4IO_setNotificationLevel(int level)
{
displayLevel = level;
return displayLevel;
}
/* ************************************************************************ */
/* ********************** LZ4 File / Stream compression ******************* */
/* ************************************************************************ */
static int LZ4S_GetBlockSize_FromBlockId (int id) { return (1 << (8 + (2 * id))); }
static unsigned int LZ4S_GetCheckBits_FromXXH (unsigned int xxh) { return (xxh >> 8) & _8BITS; }
static int LZ4S_isSkippableMagicNumber(unsigned int magic) { return (magic & LZ4S_SKIPPABLEMASK) == LZ4S_SKIPPABLE0; }
static int get_fileHandle(char* input_filename, 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 (!overwrite)
{
char ch;
DISPLAYLEVEL(2, "Warning : %s already exists\n", output_filename);
DISPLAYLEVEL(2, "Overwrite ? (Y/N) : ");
if (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;
}
// LZ4IO_compressFilename_Legacy : This function is "hidden" (not published in .h)
// Its purpose is to generate compressed streams using the old 'legacy' format
int LZ4IO_compressFilename_Legacy(char* input_filename, 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
if (compressionlevel < 3) compressionFunction = LZ4_compress; else compressionFunction = LZ4_compressHC;
start = clock();
get_fileHandle(input_filename, output_filename, &finput, &foutput);
if ((displayLevel==2) && (compressionlevel==1)) 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
*(unsigned int*)out_buff = LITTLE_ENDIAN_32(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;
DISPLAYLEVEL(3, "\rRead : %i MB ", (int)(filesize>>20));
// Compress Block
outSize = compressionFunction(in_buff, out_buff+4, inSize);
compressedfilesize += outSize+4;
DISPLAYLEVEL(3, "\rRead : %i MB ==> %.2f%% ", (int)(filesize>>20), (double)compressedfilesize/filesize*100);
// Write Block
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(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;
}
static void* LZ4IO_LZ4_createStream (const char* inputBuffer)
{
(void)inputBuffer;
return calloc(4, LZ4_STREAMSIZE_U32);
}
static int LZ4IO_LZ4_compress_limitedOutput_continue (void* ctx, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
{
(void)compressionLevel;
return LZ4_compress_limitedOutput_continue(ctx, source, dest, inputSize, maxOutputSize);
}
static int LZ4IO_LZ4_saveDict (void* LZ4_stream, char* safeBuffer, int dictSize)
{
return LZ4_saveDict ((LZ4_stream_t*) LZ4_stream, safeBuffer, dictSize);
}
static int LZ4IO_LZ4_slideInputBufferHC (void* ctx, char* buffer, int size)
{
(void)size; (void)buffer;
LZ4_slideInputBufferHC (ctx);
return 1;
}
static int LZ4IO_free (void* ptr)
{
free(ptr);
return 0;
}
static int compress_file_blockDependency(char* input_filename, char* output_filename, int compressionlevel)
{
void* (*initFunction) (const char*);
int (*compressionFunction)(void*, const char*, char*, int, int, int);
int (*nextBlockFunction) (void*, char*, int);
int (*freeFunction) (void*);
void* ctx;
unsigned long long filesize = 0;
unsigned long long compressedfilesize = 0;
unsigned int checkbits;
char* in_buff, *in_blockStart;
char* out_buff;
FILE* finput;
FILE* foutput;
clock_t start, end;
unsigned int blockSize, inputBufferSize;
size_t sizeCheck, header_size;
void* streamChecksumState=NULL;
// Init
start = clock();
if ((displayLevel==2) && (compressionlevel>=3)) displayLevel=3;
if (compressionlevel<3)
{
initFunction = LZ4IO_LZ4_createStream;
compressionFunction = LZ4IO_LZ4_compress_limitedOutput_continue;
nextBlockFunction = LZ4IO_LZ4_saveDict;
freeFunction = LZ4IO_free;
}
else
{
initFunction = LZ4_createHC;
compressionFunction = LZ4_compressHC2_limitedOutput_continue;
nextBlockFunction = LZ4IO_LZ4_slideInputBufferHC;
freeFunction = LZ4IO_free;
}
get_fileHandle(input_filename, output_filename, &finput, &foutput);
blockSize = LZ4S_GetBlockSize_FromBlockId (globalBlockSizeId);
// Allocate Memory
inputBufferSize = 64 KB + blockSize;
in_buff = (char*)malloc(inputBufferSize);
out_buff = (char*)malloc(blockSize+CACHELINE);
if (!in_buff || !out_buff) EXM_THROW(31, "Allocation error : not enough memory");
in_blockStart = in_buff + 64 KB;
if (compressionlevel>=3) in_blockStart = in_buff;
if (streamChecksum) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);
ctx = initFunction(in_buff);
// Write Archive Header
*(unsigned int*)out_buff = LITTLE_ENDIAN_32(LZ4S_MAGICNUMBER); // Magic Number, in Little Endian convention
*(out_buff+4) = (1 & _2BITS) << 6 ; // Version('01')
*(out_buff+4) |= (blockIndependence & _1BIT) << 5;
*(out_buff+4) |= (blockChecksum & _1BIT) << 4;
*(out_buff+4) |= (streamChecksum & _1BIT) << 2;
*(out_buff+5) = (char)((globalBlockSizeId & _3BITS) << 4);
checkbits = XXH32((out_buff+4), 2, LZ4S_CHECKSUM_SEED);
checkbits = LZ4S_GetCheckBits_FromXXH(checkbits);
*(out_buff+6) = (unsigned char) checkbits;
header_size = 7;
sizeCheck = fwrite(out_buff, 1, header_size, foutput);
if (sizeCheck!=header_size) EXM_THROW(32, "Write error : cannot write header");
compressedfilesize += header_size;
// Main Loop
while (1)
{
unsigned int outSize;
unsigned int inSize;
// Read Block
inSize = (unsigned int) fread(in_blockStart, (size_t)1, (size_t)blockSize, finput);
if( inSize==0 ) break; // No more input : end of compression
filesize += inSize;
DISPLAYLEVEL(3, "\rRead : %i MB ", (int)(filesize>>20));
if (streamChecksum) XXH32_update(streamChecksumState, in_blockStart, inSize);
// Compress Block
outSize = compressionFunction(ctx, in_blockStart, out_buff+4, inSize, inSize-1, compressionlevel);
if (outSize > 0) compressedfilesize += outSize+4; else compressedfilesize += inSize+4;
if (blockChecksum) compressedfilesize+=4;
DISPLAYLEVEL(3, "==> %.2f%% ", (double)compressedfilesize/filesize*100);
// Write Block
if (outSize > 0)
{
int sizeToWrite;
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(outSize);
if (blockChecksum)
{
unsigned int checksum = XXH32(out_buff+4, outSize, LZ4S_CHECKSUM_SEED);
* (unsigned int*) (out_buff+4+outSize) = LITTLE_ENDIAN_32(checksum);
}
sizeToWrite = 4 + outSize + (4*blockChecksum);
sizeCheck = fwrite(out_buff, 1, sizeToWrite, foutput);
if (sizeCheck!=(size_t)(sizeToWrite)) EXM_THROW(33, "Write error : cannot write compressed block");
}
else // Copy Original
{
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(inSize|0x80000000); // Add Uncompressed flag
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(34, "Write error : cannot write block header");
sizeCheck = fwrite(in_blockStart, 1, inSize, foutput);
if (sizeCheck!=(size_t)(inSize)) EXM_THROW(35, "Write error : cannot write block");
if (blockChecksum)
{
unsigned int checksum = XXH32(in_blockStart, inSize, LZ4S_CHECKSUM_SEED);
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(36, "Write error : cannot write block checksum");
}
}
{
size_t sizeToMove = 64 KB;
if (inSize < 64 KB) sizeToMove = inSize;
nextBlockFunction(ctx, in_blockStart - sizeToMove, (int)sizeToMove);
if (compressionlevel>=3) in_blockStart = in_buff + 64 KB;
}
}
// End of Stream mark
* (unsigned int*) out_buff = LZ4S_EOS;
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write end of stream");
compressedfilesize += 4;
if (streamChecksum)
{
unsigned int checksum = XXH32_digest(streamChecksumState);
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write stream checksum");
compressedfilesize += 4;
}
// 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
freeFunction(ctx);
free(in_buff);
free(out_buff);
fclose(finput);
fclose(foutput);
return 0;
}
FORCE_INLINE int LZ4_compress_limitedOutput_local(const char* src, char* dst, int size, int maxOut, int clevel)
{ (void)clevel; return LZ4_compress_limitedOutput(src, dst, size, maxOut); }
int LZ4IO_compressFilename(char* input_filename, char* output_filename, int compressionLevel)
{
int (*compressionFunction)(const char*, char*, int, int, int);
unsigned long long filesize = 0;
unsigned long long compressedfilesize = 0;
unsigned int checkbits;
char* in_buff;
char* out_buff;
char* headerBuffer;
FILE* finput;
FILE* foutput;
clock_t start, end;
int blockSize;
size_t sizeCheck, header_size, readSize;
void* streamChecksumState=NULL;
// Branch out
if (blockIndependence==0) return compress_file_blockDependency(input_filename, output_filename, compressionLevel);
// Init
start = clock();
if ((displayLevel==2) && (compressionLevel>=3)) displayLevel=3;
if (compressionLevel <= 3) compressionFunction = LZ4_compress_limitedOutput_local;
else { compressionFunction = LZ4_compressHC2_limitedOutput; }
get_fileHandle(input_filename, output_filename, &finput, &foutput);
blockSize = LZ4S_GetBlockSize_FromBlockId (globalBlockSizeId);
// Allocate Memory
in_buff = (char*)malloc(blockSize);
out_buff = (char*)malloc(blockSize+CACHELINE);
headerBuffer = (char*)malloc(LZ4S_MAXHEADERSIZE);
if (!in_buff || !out_buff || !(headerBuffer)) EXM_THROW(31, "Allocation error : not enough memory");
if (streamChecksum) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);
// Write Archive Header
*(unsigned int*)headerBuffer = LITTLE_ENDIAN_32(LZ4S_MAGICNUMBER); // Magic Number, in Little Endian convention
*(headerBuffer+4) = (1 & _2BITS) << 6 ; // Version('01')
*(headerBuffer+4) |= (blockIndependence & _1BIT) << 5;
*(headerBuffer+4) |= (blockChecksum & _1BIT) << 4;
*(headerBuffer+4) |= (streamChecksum & _1BIT) << 2;
*(headerBuffer+5) = (char)((globalBlockSizeId & _3BITS) << 4);
checkbits = XXH32((headerBuffer+4), 2, LZ4S_CHECKSUM_SEED);
checkbits = LZ4S_GetCheckBits_FromXXH(checkbits);
*(headerBuffer+6) = (unsigned char) checkbits;
header_size = 7;
// Write header
sizeCheck = fwrite(headerBuffer, 1, header_size, foutput);
if (sizeCheck!=header_size) EXM_THROW(32, "Write error : cannot write header");
compressedfilesize += header_size;
// read first block
readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput);
// Main Loop
while (readSize>0)
{
unsigned int outSize;
filesize += readSize;
DISPLAYLEVEL(3, "\rRead : %i MB ", (int)(filesize>>20));
if (streamChecksum) XXH32_update(streamChecksumState, in_buff, (int)readSize);
// Compress Block
outSize = compressionFunction(in_buff, out_buff+4, (int)readSize, (int)readSize-1, compressionLevel);
if (outSize > 0) compressedfilesize += outSize+4; else compressedfilesize += readSize+4;
if (blockChecksum) compressedfilesize+=4;
DISPLAYLEVEL(3, "==> %.2f%% ", (double)compressedfilesize/filesize*100);
// Write Block
if (outSize > 0)
{
int sizeToWrite;
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(outSize);
if (blockChecksum)
{
unsigned int checksum = XXH32(out_buff+4, outSize, LZ4S_CHECKSUM_SEED);
* (unsigned int*) (out_buff+4+outSize) = LITTLE_ENDIAN_32(checksum);
}
sizeToWrite = 4 + outSize + (4*blockChecksum);
sizeCheck = fwrite(out_buff, 1, sizeToWrite, foutput);
if (sizeCheck!=(size_t)(sizeToWrite)) EXM_THROW(33, "Write error : cannot write compressed block");
}
else // Copy Original Uncompressed
{
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(((unsigned long)readSize)|0x80000000); // Add Uncompressed flag
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(34, "Write error : cannot write block header");
sizeCheck = fwrite(in_buff, 1, readSize, foutput);
if (sizeCheck!=readSize) EXM_THROW(35, "Write error : cannot write block");
if (blockChecksum)
{
unsigned int checksum = XXH32(in_buff, (int)readSize, LZ4S_CHECKSUM_SEED);
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(36, "Write error : cannot write block checksum");
}
}
// Read next block
readSize = fread(in_buff, (size_t)1, (size_t)blockSize, finput);
}
// End of Stream mark
* (unsigned int*) out_buff = LZ4S_EOS;
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write end of stream");
compressedfilesize += 4;
if (streamChecksum)
{
unsigned int checksum = XXH32_digest(streamChecksumState);
* (unsigned int*) out_buff = LITTLE_ENDIAN_32(checksum);
sizeCheck = fwrite(out_buff, 1, 4, foutput);
if (sizeCheck!=(size_t)(4)) EXM_THROW(37, "Write error : cannot write stream checksum");
compressedfilesize += 4;
}
// Close & Free
free(in_buff);
free(out_buff);
free(headerBuffer);
fclose(finput);
fclose(foutput);
// 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;
}
/* ********************************************************************* */
/* ********************** LZ4 File / Stream decoding ******************* */
/* ********************************************************************* */
static unsigned long long decodeLegacyStream(FILE* finput, FILE* foutput)
{
unsigned long long filesize = 0;
char* in_buff;
char* out_buff;
unsigned int blockSize;
// 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;
// Block Size
sizeCheck = fread(&blockSize, 1, 4, finput);
if (sizeCheck==0) break; // Nothing to read : file read is completed
blockSize = LITTLE_ENDIAN_32(blockSize); // 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);
// Decode Block
decodeSize = LZ4_decompress_safe(in_buff, out_buff, blockSize, LEGACY_BLOCKSIZE);
if (decodeSize < 0) EXM_THROW(52, "Decoding Failed ! Corrupted input detected !");
filesize += decodeSize;
// Write Block
sizeCheck = fwrite(out_buff, 1, decodeSize, foutput);
if (sizeCheck != (size_t)decodeSize) EXM_THROW(53, "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;
char* in_buff;
char* out_buff, *out_start, *out_end;
unsigned char descriptor[LZ4S_MAXHEADERSIZE];
size_t nbReadBytes;
int decodedBytes=0;
unsigned int maxBlockSize;
size_t sizeCheck;
int blockChecksumFlag, streamChecksumFlag, blockIndependenceFlag;
void* streamChecksumState=NULL;
int (*decompressionFunction)(LZ4_streamDecode_t* ctx, const char* src, char* dst, int cSize, int maxOSize) = LZ4_decompress_safe_continue;
LZ4_streamDecode_t ctx;
// init
memset(&ctx, 0, sizeof(ctx));
// Decode stream descriptor
nbReadBytes = fread(descriptor, 1, 3, finput);
if (nbReadBytes != 3) EXM_THROW(61, "Unreadable header");
{
int version = (descriptor[0] >> 6) & _2BITS;
int streamSize = (descriptor[0] >> 3) & _1BIT;
int reserved1 = (descriptor[0] >> 1) & _1BIT;
int dictionary = (descriptor[0] >> 0) & _1BIT;
int reserved2 = (descriptor[1] >> 7) & _1BIT;
int blockSizeId = (descriptor[1] >> 4) & _3BITS;
int reserved3 = (descriptor[1] >> 0) & _4BITS;
int checkBits = (descriptor[2] >> 0) & _8BITS;
int checkBits_xxh32;
blockIndependenceFlag=(descriptor[0] >> 5) & _1BIT;
blockChecksumFlag = (descriptor[0] >> 4) & _1BIT;
streamChecksumFlag= (descriptor[0] >> 2) & _1BIT;
if (version != 1) EXM_THROW(62, "Wrong version number");
if (streamSize == 1) EXM_THROW(64, "Does not support stream size");
if (reserved1 != 0) EXM_THROW(65, "Wrong value for reserved bits");
if (dictionary == 1) EXM_THROW(66, "Does not support dictionary");
if (reserved2 != 0) EXM_THROW(67, "Wrong value for reserved bits");
if (blockSizeId < 4) EXM_THROW(68, "Unsupported block size");
if (reserved3 != 0) EXM_THROW(67, "Wrong value for reserved bits");
maxBlockSize = LZ4S_GetBlockSize_FromBlockId(blockSizeId);
// Checkbits verification
descriptor[1] &= 0xF0;
checkBits_xxh32 = XXH32(descriptor, 2, LZ4S_CHECKSUM_SEED);
checkBits_xxh32 = LZ4S_GetCheckBits_FromXXH(checkBits_xxh32);
if (checkBits != checkBits_xxh32) EXM_THROW(69, "Stream descriptor error detected");
}
// Allocate Memory
{
size_t outBuffSize = maxBlockSize + 64 KB;
if (outBuffSize < MIN_STREAM_BUFSIZE) outBuffSize = MIN_STREAM_BUFSIZE;
in_buff = (char*)malloc(maxBlockSize);
out_buff = (char*)malloc(outBuffSize);
out_start = out_buff;
out_end = out_start + outBuffSize;
if (!in_buff || !out_buff) EXM_THROW(70, "Allocation error : not enough memory");
if (streamChecksumFlag) streamChecksumState = XXH32_init(LZ4S_CHECKSUM_SEED);
}
// Main Loop
while (1)
{
unsigned int blockSize, uncompressedFlag;
// Block Size
nbReadBytes = fread(&blockSize, 1, 4, finput);
if( nbReadBytes != 4 ) EXM_THROW(71, "Read error : cannot read next block size");
if (blockSize == LZ4S_EOS) break; // End of Stream Mark : stream is completed
blockSize = LITTLE_ENDIAN_32(blockSize); // Convert to little endian
uncompressedFlag = blockSize >> 31;
blockSize &= 0x7FFFFFFF;
if (blockSize > maxBlockSize) EXM_THROW(72, "Error : invalid block size");
// Read Block
nbReadBytes = fread(in_buff, 1, blockSize, finput);
if( nbReadBytes != blockSize ) EXM_THROW(73, "Read error : cannot read data block" );
// Check Block
if (blockChecksumFlag)
{
unsigned int checksum = XXH32(in_buff, blockSize, LZ4S_CHECKSUM_SEED);
unsigned int readChecksum;
sizeCheck = fread(&readChecksum, 1, 4, finput);
if( sizeCheck != 4 ) EXM_THROW(74, "Read error : cannot read next block size");
readChecksum = LITTLE_ENDIAN_32(readChecksum); // Convert to little endian
if (checksum != readChecksum) EXM_THROW(75, "Error : invalid block checksum detected");
}
if (uncompressedFlag)
{
// Write uncompressed Block
sizeCheck = fwrite(in_buff, 1, blockSize, foutput);
if (sizeCheck != (size_t)blockSize) EXM_THROW(76, "Write error : cannot write data block");
filesize += blockSize;
if (streamChecksumFlag) XXH32_update(streamChecksumState, in_buff, blockSize);
if (!blockIndependenceFlag)
{
// handle dictionary for streaming
memcpy(in_buff + blockSize - 64 KB, out_buff, 64 KB);
LZ4_setStreamDecode(&ctx, out_buff, 64 KB);
out_start = out_buff + 64 KB;
}
}
else
{
// Decode Block
if (out_start + maxBlockSize > out_end) out_start = out_buff;
decodedBytes = decompressionFunction(&ctx, in_buff, out_start, blockSize, maxBlockSize);
if (decodedBytes < 0) EXM_THROW(77, "Decoding Failed ! Corrupted input detected !");
filesize += decodedBytes;
if (streamChecksumFlag) XXH32_update(streamChecksumState, out_start, decodedBytes);
// Write Block
sizeCheck = fwrite(out_start, 1, decodedBytes, foutput);
if (sizeCheck != (size_t)decodedBytes) EXM_THROW(78, "Write error : cannot write decoded block\n");
out_start += decodedBytes;
}
}
// Stream Checksum
if (streamChecksumFlag)
{
unsigned int checksum = XXH32_digest(streamChecksumState);
unsigned int readChecksum;
sizeCheck = fread(&readChecksum, 1, 4, finput);
if (sizeCheck != 4) EXM_THROW(74, "Read error : cannot read stream checksum");
readChecksum = LITTLE_ENDIAN_32(readChecksum); // Convert to little endian
if (checksum != readChecksum) EXM_THROW(79, "Error : invalid stream checksum detected");
}
// Free
free(in_buff);
free(out_buff);
return filesize;
}
static unsigned long long selectDecoder( FILE* finput, FILE* foutput)
{
unsigned int magicNumber, size;
int errorNb;
size_t nbReadBytes;
// Check Archive Header
nbReadBytes = fread(&magicNumber, 1, MAGICNUMBER_SIZE, finput);
if (nbReadBytes==0) return 0; // EOF
if (nbReadBytes != MAGICNUMBER_SIZE) EXM_THROW(41, "Unrecognized header : Magic Number unreadable");
magicNumber = LITTLE_ENDIAN_32(magicNumber); // Convert to Little Endian format
if (LZ4S_isSkippableMagicNumber(magicNumber)) magicNumber = LZ4S_SKIPPABLE0; // fold skippable magic numbers
switch(magicNumber)
{
case LZ4S_MAGICNUMBER:
return DEFAULT_DECOMPRESSOR(finput, foutput);
case LEGACY_MAGICNUMBER:
DISPLAYLEVEL(4, "Detected : Legacy format \n");
return decodeLegacyStream(finput, foutput);
case LZ4S_SKIPPABLE0:
DISPLAYLEVEL(4, "Skipping detected skippable area \n");
nbReadBytes = fread(&size, 1, 4, finput);
if (nbReadBytes != 4) EXM_THROW(42, "Stream error : skippable size unreadable");
size = LITTLE_ENDIAN_32(size); // Convert to 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 (ftell(finput) == MAGICNUMBER_SIZE) 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 0;
}
}
int LZ4IO_decompressFilename(char* input_filename, 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);
// Loop over multiple streams
do
{
decodedSize = selectDecoder(finput, foutput);
filesize += decodedSize;
} while (decodedSize);
// 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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