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zstd/programs/fileio.c
Yann Collet 4488661678 minor cosmetics
2016-02-11 04:17:50 +01:00

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/*
fileio.c - File i/o handler for zstd
Copyright (C) Yann Collet 2013-2016
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 :
- zstd homepage : http://www.zstd.net
*/
/*
Note : this is stand-alone program.
It is not part of ZSTD compression library, it is a user program of ZSTD library.
The license of ZSTD library is BSD.
The license of this file is GPLv2.
*/
/* *************************************
* Tuning options
***************************************/
#ifndef ZSTD_LEGACY_SUPPORT
/* LEGACY_SUPPORT :
* decompressor can decode older formats (starting from Zstd 0.1+) */
# define ZSTD_LEGACY_SUPPORT 1
#endif
/* *************************************
* Compiler Options
***************************************/
/* Disable some Visual warning messages */
#ifdef _MSC_VER
# define _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_DEPRECATE /* VS2005 */
# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
#endif
#define _FILE_OFFSET_BITS 64 /* Large file support on 32-bits unix */
#define _POSIX_SOURCE 1 /* enable fileno() within <stdio.h> on unix */
/* *************************************
* Includes
***************************************/
#include <stdio.h> /* fprintf, fopen, fread, _fileno, stdin, stdout */
#include <stdlib.h> /* malloc, free */
#include <string.h> /* strcmp, strlen */
#include <time.h> /* clock */
#include <errno.h> /* errno */
#include <sys/types.h> /* stat64 */
#include <sys/stat.h> /* stat64 */
#include "mem.h"
#include "fileio.h"
#include "zstd_static.h" /* ZSTD_magicNumber */
#include "zstd_buffered_static.h"
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1)
# include "zstd_legacy.h" /* legacy */
# include "fileio_legacy.h" /* legacy */
#endif
/* *************************************
* OS-specific Includes
***************************************/
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
# include <fcntl.h> /* _O_BINARY */
# include <io.h> /* _setmode, _isatty */
# define SET_BINARY_MODE(file) { int unused = _setmode(_fileno(file), _O_BINARY); (void)unused; }
# 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
#if !defined(S_ISREG)
# define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
#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 _6BITS 0x3F
#define _8BITS 0xFF
#define BIT6 0x40
#define BIT7 0x80
#define BLOCKSIZE (128 KB)
#define ROLLBUFFERSIZE (BLOCKSIZE*8*64)
#define FIO_FRAMEHEADERSIZE 5 /* as a define, because needed to allocated table on stack */
#define FSE_CHECKSUM_SEED 0
#define CACHELINE 64
#define MAX_DICT_SIZE (512 KB)
/* *************************************
* Macros
***************************************/
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (g_displayLevel>=l) { DISPLAY(__VA_ARGS__); }
static U32 g_displayLevel = 2; /* 0 : no display; 1: errors; 2 : + result + interaction + warnings; 3 : + progression; 4 : + information */
#define DISPLAYUPDATE(l, ...) if (g_displayLevel>=l) { \
if ((FIO_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 U32 g_overwrite = 0;
void FIO_overwriteMode(void) { g_overwrite=1; }
void FIO_setNotificationLevel(unsigned level) { g_displayLevel=level; }
/* *************************************
* 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); \
}
/* *************************************
* Functions
***************************************/
static unsigned FIO_GetMilliSpan(clock_t nPrevious)
{
clock_t nCurrent = clock();
unsigned nSpan = (unsigned)(((nCurrent - nPrevious) * 1000) / CLOCKS_PER_SEC);
return nSpan;
}
static U64 FIO_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;
return (U64)statbuf.st_size;
}
static int FIO_getFiles(FILE** fileOutPtr, FILE** fileInPtr,
const char* dstFileName, const char* srcFileName)
{
if (!strcmp (srcFileName, stdinmark)) {
DISPLAYLEVEL(4,"Using stdin for input\n");
*fileInPtr = stdin;
SET_BINARY_MODE(stdin);
} else {
*fileInPtr = fopen(srcFileName, "rb");
}
if ( *fileInPtr==0 ) {
DISPLAYLEVEL(1, "Unable to access file for processing: %s\n", srcFileName);
return 1;
}
if (!strcmp (dstFileName, stdoutmark)) {
DISPLAYLEVEL(4,"Using stdout for output\n");
*fileOutPtr = stdout;
SET_BINARY_MODE(stdout);
} else {
if (!g_overwrite) { /* Check if destination file already exists */
*fileOutPtr = fopen( dstFileName, "rb" );
if (*fileOutPtr != 0) { /* dest file exists, prompt for overwrite authorization */
fclose(*fileOutPtr);
DISPLAY("Warning : %s already exists \n", dstFileName);
if ((g_displayLevel <= 1) || (*fileInPtr == stdin)) {
/* No interaction possible */
DISPLAY("Operation aborted : %s already exists \n", dstFileName);
return 1;
}
DISPLAY("Overwrite ? (y/N) : ");
{
int ch = getchar();
if ((ch!='Y') && (ch!='y')) {
DISPLAY("No. Operation aborted : %s already exists \n", dstFileName);
return 1;
}
while ((ch!=EOF) && (ch!='\n')) ch = getchar(); /* flush rest of input line */
} } }
*fileOutPtr = fopen( dstFileName, "wb" );
}
if (*fileOutPtr==0) EXM_THROW(13, "Pb opening %s", dstFileName);
return 0;
}
/*!FIO_loadFile
* creates a buffer, pointed by *bufferPtr,
* loads "filename" content into it
* up to MAX_DICT_SIZE bytes
*/
static size_t FIO_loadFile(void** bufferPtr, const char* fileName)
{
FILE* fileHandle;
size_t readSize;
U64 fileSize;
*bufferPtr = NULL;
if (fileName == NULL) return 0;
DISPLAYLEVEL(4,"Loading %s as dictionary \n", fileName);
fileHandle = fopen(fileName, "rb");
if (fileHandle==0) EXM_THROW(31, "Error opening file %s", fileName);
fileSize = FIO_getFileSize(fileName);
if (fileSize > MAX_DICT_SIZE) {
int seekResult;
if (fileSize > 1 GB) EXM_THROW(32, "Dictionary file %s is too large", fileName); /* avoid extreme cases */
DISPLAYLEVEL(2,"Dictionary %s is too large : using last %u bytes only \n", fileName, MAX_DICT_SIZE);
seekResult = fseek(fileHandle, (long int)(fileSize-MAX_DICT_SIZE), SEEK_SET); /* use end of file */
if (seekResult != 0) EXM_THROW(33, "Error seeking into file %s", fileName);
fileSize = MAX_DICT_SIZE;
}
*bufferPtr = (BYTE*)malloc((size_t)fileSize);
if (*bufferPtr==NULL) EXM_THROW(34, "Allocation error : not enough memory for dictBuffer");
readSize = fread(*bufferPtr, 1, (size_t)fileSize, fileHandle);
if (readSize!=fileSize) EXM_THROW(35, "Error reading dictionary file %s", fileName);
fclose(fileHandle);
return (size_t)fileSize;
}
/* **********************************************************************
* Compression
************************************************************************/
typedef struct {
void* srcBuffer;
size_t srcBufferSize;
void* dstBuffer;
size_t dstBufferSize;
void* dictBuffer;
size_t dictBufferSize;
ZBUFF_CCtx* ctx;
} cRess_t;
static cRess_t FIO_createCResources(const char* dictFileName)
{
cRess_t ress;
ress.ctx = ZBUFF_createCCtx();
if (ress.ctx == NULL) EXM_THROW(30, "Allocation error : can't create ZBUFF context");
/* Allocate Memory */
ress.srcBufferSize = ZBUFF_recommendedCInSize();
ress.srcBuffer = malloc(ress.srcBufferSize);
ress.dstBufferSize = ZBUFF_recommendedCOutSize();
ress.dstBuffer = malloc(ress.dstBufferSize);
if (!ress.srcBuffer || !ress.dstBuffer) EXM_THROW(31, "Allocation error : not enough memory");
/* dictionary */
ress.dictBufferSize = FIO_loadFile(&(ress.dictBuffer), dictFileName);
return ress;
}
static void FIO_freeCResources(cRess_t ress)
{
size_t errorCode;
free(ress.srcBuffer);
free(ress.dstBuffer);
free(ress.dictBuffer);
errorCode = ZBUFF_freeCCtx(ress.ctx);
if (ZBUFF_isError(errorCode)) EXM_THROW(38, "Error : can't release ZBUFF context resource : %s", ZBUFF_getErrorName(errorCode));
}
/*!
* FIO_compressFilename_extRess() :
* @result : 0 : compression completed correctly,
* 1 : missing or pb opening srcFileName
*/
static int FIO_compressFilename_extRess(cRess_t ress,
const char* dstFileName, const char* srcFileName,
int cLevel)
{
FILE* srcFile;
FILE* dstFile;
U64 filesize = 0;
U64 compressedfilesize = 0;
size_t dictSize = ress.dictBufferSize;
size_t sizeCheck, errorCode;
/* File check */
if (FIO_getFiles(&dstFile, &srcFile, dstFileName, srcFileName)) return 1;
/* init */
filesize = FIO_getFileSize(srcFileName) + dictSize;
errorCode = ZBUFF_compressInit_advanced(ress.ctx, ress.dictBuffer, ress.dictBufferSize, ZSTD_getParams(cLevel, filesize));
if (ZBUFF_isError(errorCode)) EXM_THROW(21, "Error initializing compression : %s", ZBUFF_getErrorName(errorCode));
/* Main compression loop */
filesize = 0;
while (1) {
/* Fill input Buffer */
size_t inSize = fread(ress.srcBuffer, (size_t)1, ress.srcBufferSize, srcFile);
if (inSize==0) break;
filesize += inSize;
DISPLAYUPDATE(2, "\rRead : %u MB ", (U32)(filesize>>20));
{
/* Compress (buffered streaming ensures appropriate formatting) */
size_t usedInSize = inSize;
size_t cSize = ress.dstBufferSize;
size_t result = ZBUFF_compressContinue(ress.ctx, ress.dstBuffer, &cSize, ress.srcBuffer, &usedInSize);
if (ZBUFF_isError(result))
EXM_THROW(23, "Compression error : %s ", ZBUFF_getErrorName(result));
if (inSize != usedInSize)
/* inBuff should be entirely consumed since buffer sizes are recommended ones */
EXM_THROW(24, "Compression error : input block not fully consumed");
/* Write cBlock */
sizeCheck = fwrite(ress.dstBuffer, 1, cSize, dstFile);
if (sizeCheck!=cSize) EXM_THROW(25, "Write error : cannot write compressed block into %s", dstFileName);
compressedfilesize += cSize;
}
DISPLAYUPDATE(2, "\rRead : %u MB ==> %.2f%% ", (U32)(filesize>>20), (double)compressedfilesize/filesize*100);
}
/* End of Frame */
{
size_t cSize = ress.dstBufferSize;
size_t result = ZBUFF_compressEnd(ress.ctx, ress.dstBuffer, &cSize);
if (result!=0) EXM_THROW(26, "Compression error : cannot create frame end");
sizeCheck = fwrite(ress.dstBuffer, 1, cSize, dstFile);
if (sizeCheck!=cSize) EXM_THROW(27, "Write error : cannot write frame end into %s", dstFileName);
compressedfilesize += cSize;
}
/* Status */
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);
/* clean */
fclose(srcFile);
if (fclose(dstFile)) EXM_THROW(28, "Write error : cannot properly close %s", dstFileName);
return 0;
}
int FIO_compressFilename(const char* dstFileName, const char* srcFileName,
const char* dictFileName, int compressionLevel)
{
clock_t start, end;
cRess_t ress;
int issueWithSrcFile = 0;
/* Init */
start = clock();
ress = FIO_createCResources(dictFileName);
/* Compress File */
issueWithSrcFile += FIO_compressFilename_extRess(ress, dstFileName, srcFileName, compressionLevel);
/* Free resources */
FIO_freeCResources(ress);
/* Final Status */
end = clock();
{
double seconds = (double)(end - start) / CLOCKS_PER_SEC;
DISPLAYLEVEL(4, "Completed in %.2f sec \n", seconds);
}
return issueWithSrcFile;
}
#define FNSPACE 30
int FIO_compressMultipleFilenames(const char** inFileNamesTable, unsigned nbFiles,
const char* suffix,
const char* dictFileName, int compressionLevel)
{
unsigned u;
int missed_files = 0;
char* dstFileName = (char*)malloc(FNSPACE);
size_t dfnSize = FNSPACE;
const size_t suffixSize = strlen(suffix);
cRess_t ress;
/* init */
ress = FIO_createCResources(dictFileName);
/* loop on each file */
for (u=0; u<nbFiles; u++) {
size_t ifnSize = strlen(inFileNamesTable[u]);
if (dfnSize <= ifnSize+suffixSize+1) { free(dstFileName); dfnSize = ifnSize + 20; dstFileName = (char*)malloc(dfnSize); }
strcpy(dstFileName, inFileNamesTable[u]);
strcat(dstFileName, suffix);
missed_files += FIO_compressFilename_extRess(ress, dstFileName, inFileNamesTable[u], compressionLevel);
}
/* Close & Free */
FIO_freeCResources(ress);
free(dstFileName);
return missed_files;
}
/* **************************************************************************
* Decompression
****************************************************************************/
typedef struct {
void* srcBuffer;
size_t srcBufferSize;
void* dstBuffer;
size_t dstBufferSize;
void* dictBuffer;
size_t dictBufferSize;
ZBUFF_DCtx* dctx;
} dRess_t;
static dRess_t FIO_createDResources(const char* dictFileName)
{
dRess_t ress;
/* init */
ress.dctx = ZBUFF_createDCtx();
if (ress.dctx==NULL) EXM_THROW(60, "Can't create ZBUFF decompression context");
/* Allocate Memory */
ress.srcBufferSize = ZBUFF_recommendedDInSize();
ress.srcBuffer = malloc(ress.srcBufferSize);
ress.dstBufferSize = ZBUFF_recommendedDOutSize();
ress.dstBuffer = malloc(ress.dstBufferSize);
if (!ress.srcBuffer || !ress.dstBuffer) EXM_THROW(61, "Allocation error : not enough memory");
/* dictionary */
ress.dictBufferSize = FIO_loadFile(&(ress.dictBuffer), dictFileName);
return ress;
}
static void FIO_freeDResources(dRess_t ress)
{
size_t errorCode = ZBUFF_freeDCtx(ress.dctx);
if (ZBUFF_isError(errorCode)) EXM_THROW(69, "Error : can't free ZBUFF context resource : %s", ZBUFF_getErrorName(errorCode));
free(ress.srcBuffer);
free(ress.dstBuffer);
free(ress.dictBuffer);
}
unsigned long long FIO_decompressFrame(dRess_t ress,
FILE* foutput, FILE* finput, size_t alreadyLoaded)
{
U64 frameSize = 0;
size_t readSize=alreadyLoaded;
/* Main decompression Loop */
ZBUFF_decompressInitDictionary(ress.dctx, ress.dictBuffer, ress.dictBufferSize);
while (1) {
/* Decode */
size_t sizeCheck;
size_t inSize=readSize, decodedSize=ress.dstBufferSize;
size_t toRead = ZBUFF_decompressContinue(ress.dctx, ress.dstBuffer, &decodedSize, ress.srcBuffer, &inSize);
if (ZBUFF_isError(toRead)) EXM_THROW(36, "Decoding error : %s", ZBUFF_getErrorName(toRead));
readSize -= inSize;
/* Write block */
sizeCheck = fwrite(ress.dstBuffer, 1, decodedSize, foutput);
if (sizeCheck != decodedSize) EXM_THROW(37, "Write error : unable to write data block to destination file");
frameSize += decodedSize;
DISPLAYUPDATE(2, "\rDecoded : %u MB... ", (U32)(frameSize>>20) );
if (toRead == 0) break;
if (readSize) EXM_THROW(38, "Decoding error : should consume entire input");
/* Fill input buffer */
if (toRead > ress.srcBufferSize) EXM_THROW(34, "too large block");
readSize = fread(ress.srcBuffer, 1, toRead, finput);
if (readSize != toRead) EXM_THROW(35, "Read error");
}
return frameSize;
}
static int FIO_decompressFile_extRess(dRess_t ress,
const char* dstFileName, const char* srcFileName)
{
unsigned long long filesize = 0;
FILE* srcFile;
FILE* dstFile;
/* Init */
if (FIO_getFiles(&dstFile, &srcFile, dstFileName, srcFileName)) return 1;
/* for each frame */
for ( ; ; ) {
size_t sizeCheck;
/* check magic number -> version */
size_t toRead = 4;
sizeCheck = fread(ress.srcBuffer, (size_t)1, toRead, srcFile);
if (sizeCheck==0) break; /* no more input */
if (sizeCheck != toRead) EXM_THROW(31, "Read error : cannot read header");
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1)
if (ZSTD_isLegacy(MEM_readLE32(ress.srcBuffer))) {
filesize += FIO_decompressLegacyFrame(dstFile, srcFile, MEM_readLE32(ress.srcBuffer));
continue;
}
#endif /* ZSTD_LEGACY_SUPPORT */
filesize += FIO_decompressFrame(ress, dstFile, srcFile, toRead);
}
/* Final Status */
DISPLAYLEVEL(2, "\r%79s\r", "");
DISPLAYLEVEL(2, "Successfully decoded %llu bytes \n", filesize);
/* Close */
fclose(srcFile);
if (fclose(dstFile)) EXM_THROW(38, "Write error : cannot properly close %s", dstFileName);
return 0;
}
int FIO_decompressFilename(const char* dstFileName, const char* srcFileName,
const char* dictFileName)
{
int missingFiles = 0;
dRess_t ress = FIO_createDResources(dictFileName);
missingFiles += FIO_decompressFile_extRess(ress, dstFileName, srcFileName);
FIO_freeDResources(ress);
return missingFiles;
}
#define MAXSUFFIXSIZE 8
int FIO_decompressMultipleFilenames(const char** srcNamesTable, unsigned nbFiles,
const char* suffix,
const char* dictFileName)
{
unsigned u;
int skippedFiles = 0;
int missingFiles = 0;
char* dstFileName = (char*)malloc(FNSPACE);
size_t dfnSize = FNSPACE;
const size_t suffixSize = strlen(suffix);
dRess_t ress;
if (dstFileName==NULL) EXM_THROW(70, "not enough memory for dstFileName");
ress = FIO_createDResources(dictFileName);
for (u=0; u<nbFiles; u++) {
const char* srcFileName = srcNamesTable[u];
size_t sfnSize = strlen(srcFileName);
const char* suffixPtr = srcFileName + sfnSize - suffixSize;
if (dfnSize <= sfnSize-suffixSize+1) { free(dstFileName); dfnSize = sfnSize + 20; dstFileName = (char*)malloc(dfnSize); if (dstFileName==NULL) EXM_THROW(71, "not enough memory for dstFileName"); }
if (sfnSize <= suffixSize || strcmp(suffixPtr, suffix) != 0) {
DISPLAYLEVEL(1, "File extension doesn't match expected extension (%4s); will not process file: %s\n", suffix, srcFileName);
skippedFiles++;
continue;
}
memcpy(dstFileName, srcFileName, sfnSize - suffixSize);
dstFileName[sfnSize-suffixSize] = '\0';
missingFiles += FIO_decompressFile_extRess(ress, dstFileName, srcFileName);
}
FIO_freeDResources(ress);
free(dstFileName);
return missingFiles + skippedFiles;
}
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