| /* |
| 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 |
| ***************************************/ |
| #define _POSIX_SOURCE 1 /* enable %llu on Windows */ |
| |
| |
| /*-************************************* |
| * Includes |
| ***************************************/ |
| #include "util.h" /* Compiler options, UTIL_GetFileSize */ |
| #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 "mem.h" |
| #include "fileio.h" |
| #include "zstd_static.h" /* ZSTD_magicNumber, ZSTD_frameHeaderSize_max */ |
| #include "zstd_internal.h" /* MIN, KB, MB */ |
| #include "zbuff_static.h" |
| |
| #if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1) |
| # include "zstd_legacy.h" /* ZSTD_isLegacy */ |
| # include "fileio_legacy.h" /* FIO_decompressLegacyFrame */ |
| #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) { if (_setmode(_fileno(file), _O_BINARY) == -1) perror("Cannot set _O_BINARY"); } |
| #else |
| # include <unistd.h> /* isatty */ |
| # define SET_BINARY_MODE(file) |
| #endif |
| |
| |
| /*-************************************* |
| * Constants |
| ***************************************/ |
| #define _1BIT 0x01 |
| #define _2BITS 0x03 |
| #define _3BITS 0x07 |
| #define _4BITS 0x0F |
| #define _6BITS 0x3F |
| #define _8BITS 0xFF |
| |
| #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 (1 MB) /* protection against large input (attack scenario) ; can be changed */ |
| |
| #define FNSPACE 30 |
| |
| |
| /*-************************************* |
| * 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 */ |
| void FIO_setNotificationLevel(unsigned level) { g_displayLevel=level; } |
| |
| #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; |
| |
| static unsigned FIO_GetMilliSpan(clock_t nPrevious) |
| { |
| clock_t const nCurrent = clock(); |
| return (unsigned)(((nCurrent - nPrevious) * 1000) / CLOCKS_PER_SEC); |
| } |
| |
| |
| /*-************************************* |
| * Local Parameters |
| ***************************************/ |
| static U32 g_overwrite = 0; |
| void FIO_overwriteMode(void) { g_overwrite=1; } |
| static U32 g_maxWLog = 23; |
| void FIO_setMaxWLog(unsigned maxWLog) { g_maxWLog = maxWLog; } |
| static U32 g_sparseFileSupport = 1; /* 0 : no sparse allowed; 1: auto (file yes, stdout no); 2: force sparse */ |
| void FIO_setSparseWrite(unsigned sparse) { g_sparseFileSupport=sparse; } |
| |
| |
| /*-************************************* |
| * 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 FILE* FIO_openSrcFile(const char* srcFileName) |
| { |
| FILE* f; |
| |
| if (!strcmp (srcFileName, stdinmark)) { |
| DISPLAYLEVEL(4,"Using stdin for input\n"); |
| f = stdin; |
| SET_BINARY_MODE(stdin); |
| } else { |
| f = fopen(srcFileName, "rb"); |
| } |
| |
| if ( f==NULL ) DISPLAYLEVEL(1, "zstd: %s: No such file\n", srcFileName); |
| |
| return f; |
| } |
| |
| |
| static FILE* FIO_openDstFile(const char* dstFileName) |
| { |
| FILE* f; |
| |
| if (!strcmp (dstFileName, stdoutmark)) { |
| DISPLAYLEVEL(4,"Using stdout for output\n"); |
| f = 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 { |
| if (!g_overwrite) { /* Check if destination file already exists */ |
| f = fopen( dstFileName, "rb" ); |
| if (f != 0) { /* dest file exists, prompt for overwrite authorization */ |
| fclose(f); |
| if (g_displayLevel <= 1) { |
| /* No interaction possible */ |
| DISPLAY("zstd: %s already exists; not overwritten \n", dstFileName); |
| return 0; |
| } |
| DISPLAY("zstd: %s already exists; do you wish to overwrite (y/N) ? ", dstFileName); |
| { int ch = getchar(); |
| if ((ch!='Y') && (ch!='y')) { |
| DISPLAY(" not overwritten \n"); |
| return 0; |
| } |
| while ((ch!=EOF) && (ch!='\n')) ch = getchar(); /* flush rest of input line */ |
| } } } |
| f = fopen( dstFileName, "wb" ); |
| } |
| return f; |
| } |
| |
| |
| /*! 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 = UTIL_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; |
| } |
| |
| #ifndef ZSTD_NOCOMPRESS |
| |
| /*-********************************************************************** |
| * Compression |
| ************************************************************************/ |
| typedef struct { |
| void* srcBuffer; |
| size_t srcBufferSize; |
| void* dstBuffer; |
| size_t dstBufferSize; |
| void* dictBuffer; |
| size_t dictBufferSize; |
| ZBUFF_CCtx* ctx; |
| FILE* dstFile; |
| FILE* srcFile; |
| } 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_internal() : |
| * same as FIO_compressFilename_extRess(), with `ress.desFile` already opened. |
| * @return : 0 : compression completed correctly, |
| * 1 : missing or pb opening srcFileName |
| */ |
| static int FIO_compressFilename_internal(cRess_t ress, |
| const char* dstFileName, const char* srcFileName, |
| int cLevel) |
| { |
| FILE* const srcFile = ress.srcFile; |
| FILE* const dstFile = ress.dstFile; |
| U64 readsize = 0; |
| U64 compressedfilesize = 0; |
| U64 const fileSize = UTIL_getFileSize(srcFileName); |
| |
| /* init */ |
| { ZSTD_parameters params; |
| params.cParams = ZSTD_getCParams(cLevel, fileSize, ress.dictBufferSize); |
| params.fParams.contentSizeFlag = 1; |
| if (g_maxWLog) if (params.cParams.windowLog > g_maxWLog) params.cParams.windowLog = g_maxWLog; |
| { size_t const errorCode = ZBUFF_compressInit_advanced(ress.ctx, ress.dictBuffer, ress.dictBufferSize, params, fileSize); |
| if (ZBUFF_isError(errorCode)) EXM_THROW(21, "Error initializing compression : %s", ZBUFF_getErrorName(errorCode)); } |
| } |
| |
| /* Main compression loop */ |
| readsize = 0; |
| while (1) { |
| /* Fill input Buffer */ |
| size_t const inSize = fread(ress.srcBuffer, (size_t)1, ress.srcBufferSize, srcFile); |
| if (inSize==0) break; |
| readsize += inSize; |
| DISPLAYUPDATE(2, "\rRead : %u MB ", (U32)(readsize>>20)); |
| |
| { /* Compress using buffered streaming */ |
| size_t usedInSize = inSize; |
| size_t cSize = ress.dstBufferSize; |
| { size_t const 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 */ |
| { size_t const 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)(readsize>>20), (double)compressedfilesize/readsize*100); |
| } |
| |
| /* End of Frame */ |
| { size_t cSize = ress.dstBufferSize; |
| size_t const result = ZBUFF_compressEnd(ress.ctx, ress.dstBuffer, &cSize); |
| if (result!=0) EXM_THROW(26, "Compression error : cannot create frame end"); |
| |
| { size_t const 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)readsize, (unsigned long long) compressedfilesize, (double)compressedfilesize/readsize*100); |
| |
| return 0; |
| } |
| |
| |
| /*! FIO_compressFilename_internal() : |
| * same as FIO_compressFilename_extRess(), with ress.destFile already opened (typically stdout) |
| * @return : 0 : compression completed correctly, |
| * 1 : missing or pb opening srcFileName |
| */ |
| static int FIO_compressFilename_srcFile(cRess_t ress, |
| const char* dstFileName, const char* srcFileName, |
| int cLevel) |
| { |
| int result; |
| |
| /* File check */ |
| ress.srcFile = FIO_openSrcFile(srcFileName); |
| if (!ress.srcFile) return 1; /* srcFile could not be opened */ |
| |
| result = FIO_compressFilename_internal(ress, dstFileName, srcFileName, cLevel); |
| |
| fclose(ress.srcFile); |
| return result; |
| } |
| |
| |
| /*! FIO_compressFilename_extRess() : |
| * @return : 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) |
| { |
| int result; |
| |
| ress.srcFile = FIO_openSrcFile(srcFileName); |
| if (ress.srcFile==0) return 1; |
| ress.dstFile = FIO_openDstFile(dstFileName); |
| if (ress.dstFile==0) { fclose(ress.srcFile); return 1; } |
| |
| result = FIO_compressFilename_internal(ress, dstFileName, srcFileName, cLevel); |
| if (result!=0) remove(dstFileName); /* remove operation artefact */ |
| |
| fclose(ress.srcFile); /* no pb to expect : only reading */ |
| if (fclose(ress.dstFile)) EXM_THROW(28, "Write error : cannot properly close %s", dstFileName); |
| return result; |
| } |
| |
| |
| int FIO_compressFilename(const char* dstFileName, const char* srcFileName, |
| const char* dictFileName, int compressionLevel) |
| { |
| clock_t start; |
| cRess_t ress; |
| int issueWithSrcFile = 0; |
| |
| /* Init */ |
| start = clock(); |
| ress = FIO_createCResources(dictFileName); |
| |
| issueWithSrcFile += FIO_compressFilename_extRess(ress, dstFileName, srcFileName, compressionLevel); |
| |
| FIO_freeCResources(ress); |
| |
| { double seconds = (double)(clock() - start) / CLOCKS_PER_SEC; |
| DISPLAYLEVEL(4, "Completed in %.2f sec \n", seconds); |
| } |
| return issueWithSrcFile; |
| } |
| |
| |
| int FIO_compressMultipleFilenames(const char** inFileNamesTable, unsigned nbFiles, |
| const char* suffix, |
| const char* dictFileName, int compressionLevel) |
| { |
| int missed_files = 0; |
| char* dstFileName = (char*)malloc(FNSPACE); |
| size_t dfnSize = FNSPACE; |
| size_t const suffixSize = suffix ? strlen(suffix) : 0; |
| cRess_t ress; |
| |
| /* init */ |
| ress = FIO_createCResources(dictFileName); |
| |
| /* loop on each file */ |
| if (!strcmp(suffix, stdoutmark)) { |
| unsigned u; |
| ress.dstFile = stdout; |
| SET_BINARY_MODE(stdout); |
| for (u=0; u<nbFiles; u++) |
| missed_files += FIO_compressFilename_srcFile(ress, stdoutmark, |
| inFileNamesTable[u], compressionLevel); |
| if (fclose(ress.dstFile)) EXM_THROW(29, "Write error : cannot properly close %s", stdoutmark); |
| } else { |
| unsigned u; |
| 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; |
| } |
| |
| #endif /* #ifndef ZSTD_NOCOMPRESS */ |
| |
| |
| |
| #ifndef ZSTD_NODECOMPRESS |
| |
| /* ************************************************************************** |
| * Decompression |
| ****************************************************************************/ |
| typedef struct { |
| void* srcBuffer; |
| size_t srcBufferSize; |
| void* dstBuffer; |
| size_t dstBufferSize; |
| void* dictBuffer; |
| size_t dictBufferSize; |
| ZBUFF_DCtx* dctx; |
| FILE* dstFile; |
| } 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 const 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); |
| } |
| |
| |
| /** FIO_fwriteSparse() : |
| * @return : storedSkips, to be provided to next call to FIO_fwriteSparse() of LZ4IO_fwriteSparseEnd() */ |
| static unsigned FIO_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 */ |
| size_t bufferSizeT = bufferSize / sizeof(size_t); |
| const size_t* const bufferTEnd = bufferT + bufferSizeT; |
| const size_t* ptrT = bufferT; |
| static const size_t segmentSizeT = (32 KB) / sizeof(size_t); /* 0-test re-attempted every 32 KB */ |
| |
| 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 * sizeof(size_t)); |
| |
| 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, sizeof(size_t), seg0SizeT, file); |
| if (sizeCheck != seg0SizeT) EXM_THROW(73, "Write error : cannot write decoded block"); |
| } } |
| ptrT += seg0SizeT; |
| } |
| |
| { static size_t const maskT = sizeof(size_t)-1; |
| if (bufferSize & maskT) { /* size not multiple of sizeof(size_t) : implies end of block */ |
| const char* const restStart = (const char*)bufferTEnd; |
| const char* restPtr = restStart; |
| size_t restSize = bufferSize & maskT; |
| const char* const restEnd = restStart + restSize; |
| for ( ; (restPtr < restEnd) && (*restPtr == 0); restPtr++) ; |
| storedSkips += (unsigned) (restPtr - restStart); |
| if (restPtr != restEnd) { |
| int 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 FIO_fwriteSparseEnd(FILE* file, unsigned storedSkips) |
| { |
| if (storedSkips-->0) { /* implies g_sparseFileSupport>0 */ |
| int const seekResult = fseek(file, storedSkips, 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"); |
| } } |
| } |
| |
| /** FIO_decompressFrame() : |
| @return : size of decoded frame |
| */ |
| unsigned long long FIO_decompressFrame(dRess_t ress, |
| FILE* foutput, FILE* finput, size_t alreadyLoaded) |
| { |
| U64 frameSize = 0; |
| size_t readSize; |
| U32 storedSkips = 0; |
| |
| ZBUFF_decompressInitDictionary(ress.dctx, ress.dictBuffer, ress.dictBufferSize); |
| |
| /* Header loading (optional, saves one loop) */ |
| { size_t const toLoad = ZSTD_frameHeaderSize_min - alreadyLoaded; /* assumption : ZSTD_frameHeaderSize_min >= alreadyLoaded */ |
| size_t const loadedSize = fread(((char*)ress.srcBuffer) + alreadyLoaded, 1, toLoad, finput); |
| readSize = alreadyLoaded + loadedSize; |
| } |
| |
| /* Main decompression Loop */ |
| while (1) { |
| /* Decode */ |
| size_t inSize=readSize, decodedSize=ress.dstBufferSize; |
| size_t const 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 */ |
| storedSkips = FIO_fwriteSparse(foutput, ress.dstBuffer, decodedSize, storedSkips); |
| frameSize += decodedSize; |
| DISPLAYUPDATE(2, "\rDecoded : %u MB... ", (U32)(frameSize>>20) ); |
| |
| if (toRead == 0) break; /* end of frame */ |
| 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"); |
| } |
| |
| FIO_fwriteSparseEnd(foutput, storedSkips); |
| |
| return frameSize; |
| } |
| |
| |
| /** FIO_passThrough() : just copy input into output, for compatibility with gzip -df mode |
| @return : 0 (no error) */ |
| static unsigned FIO_passThrough(FILE* foutput, FILE* finput, void* buffer, size_t bufferSize) |
| { |
| size_t const blockSize = MIN (64 KB, bufferSize); |
| size_t readFromInput = 1; |
| unsigned storedSkips = 0; |
| |
| /* assumption : first 4 bytes already loaded (magic number detection), and stored within buffer */ |
| { size_t const sizeCheck = fwrite(buffer, 1, 4, foutput); |
| if (sizeCheck != 4) EXM_THROW(50, "Pass-through write error"); } |
| |
| while (readFromInput) { |
| readFromInput = fread(buffer, 1, blockSize, finput); |
| storedSkips = FIO_fwriteSparse(foutput, buffer, readFromInput, storedSkips); |
| } |
| |
| FIO_fwriteSparseEnd(foutput, storedSkips); |
| return 0; |
| } |
| |
| |
| /** FIO_decompressSrcFile() : |
| Decompression `srcFileName` into `ress.dstFile` |
| @return : 0 : OK |
| 1 : operation not started |
| */ |
| static int FIO_decompressSrcFile(dRess_t ress, const char* srcFileName) |
| { |
| unsigned long long filesize = 0; |
| FILE* const dstFile = ress.dstFile; |
| FILE* const srcFile = FIO_openSrcFile(srcFileName); |
| if (srcFile==0) return 1; |
| |
| /* for each frame */ |
| for ( ; ; ) { |
| /* check magic number -> version */ |
| size_t const toRead = 4; |
| size_t const sizeCheck = fread(ress.srcBuffer, (size_t)1, toRead, srcFile); |
| if (sizeCheck==0) break; /* no more input */ |
| if (sizeCheck != toRead) EXM_THROW(31, "zstd: %s read error : cannot read header", srcFileName); |
| { U32 const magic = MEM_readLE32(ress.srcBuffer); |
| #if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) |
| if (ZSTD_isLegacy(magic)) { |
| filesize += FIO_decompressLegacyFrame(dstFile, srcFile, ress.dictBuffer, ress.dictBufferSize, magic); |
| continue; |
| } |
| #endif |
| if (magic != ZSTD_MAGICNUMBER) { |
| if (g_overwrite) /* -df : pass-through mode */ |
| return FIO_passThrough(dstFile, srcFile, ress.srcBuffer, ress.srcBufferSize); |
| else { |
| DISPLAYLEVEL(1, "zstd: %s: not in zstd format \n", srcFileName); |
| return 1; |
| } } } |
| 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); |
| return 0; |
| } |
| |
| |
| /** FIO_decompressFile_extRess() : |
| decompress `srcFileName` into `dstFileName` |
| @return : 0 : OK |
| 1 : operation aborted (src not available, dst already taken, etc.) |
| */ |
| static int FIO_decompressFile_extRess(dRess_t ress, |
| const char* dstFileName, const char* srcFileName) |
| { |
| int result; |
| ress.dstFile = FIO_openDstFile(dstFileName); |
| if (ress.dstFile==0) return 1; |
| |
| result = FIO_decompressSrcFile(ress, srcFileName); |
| if (result != 0) remove(dstFileName); |
| |
| if (fclose(ress.dstFile)) EXM_THROW(38, "Write error : cannot properly close %s", dstFileName); |
| return result; |
| } |
| |
| |
| 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) |
| { |
| int skippedFiles = 0; |
| int missingFiles = 0; |
| dRess_t ress = FIO_createDResources(dictFileName); |
| |
| if (!strcmp(suffix, stdoutmark) || !strcmp(suffix, nulmark)) { |
| unsigned u; |
| ress.dstFile = FIO_openDstFile(suffix); |
| if (ress.dstFile == 0) EXM_THROW(71, "cannot open %s", suffix); |
| for (u=0; u<nbFiles; u++) |
| missingFiles += FIO_decompressSrcFile(ress, srcNamesTable[u]); |
| if (fclose(ress.dstFile)) EXM_THROW(39, "Write error : cannot properly close %s", stdoutmark); |
| } else { |
| size_t const suffixSize = suffix ? strlen(suffix) : 0; |
| size_t dfnSize = FNSPACE; |
| unsigned u; |
| char* dstFileName = (char*)malloc(FNSPACE); |
| if (dstFileName==NULL) EXM_THROW(70, "not enough memory for dstFileName"); |
| for (u=0; u<nbFiles; u++) { /* create dstFileName */ |
| const char* const srcFileName = srcNamesTable[u]; |
| size_t const sfnSize = strlen(srcFileName); |
| const char* const suffixPtr = srcFileName + sfnSize - suffixSize; |
| if (dfnSize+suffixSize <= sfnSize+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, "zstd: %s: unknown suffix (%4s expected) -- ignored \n", srcFileName, suffix); |
| skippedFiles++; |
| continue; |
| } |
| memcpy(dstFileName, srcFileName, sfnSize - suffixSize); |
| dstFileName[sfnSize-suffixSize] = '\0'; |
| |
| missingFiles += FIO_decompressFile_extRess(ress, dstFileName, srcFileName); |
| } |
| free(dstFileName); |
| } |
| |
| FIO_freeDResources(ress); |
| return missingFiles + skippedFiles; |
| } |
| |
| #endif /* #ifndef ZSTD_NODECOMPRESS */ |
