116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include <stdlib.h> // malloc, free, exit
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#include <stdio.h> // fprintf, perror, fopen, etc.
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#include <string.h> // strlen, strcat, memset, strerror
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#include <errno.h> // errno
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#include <sys/stat.h> // stat
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#include <zstd.h> // presumes zstd library is installed
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#include "utils.h"
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/* compress with pre-allocated context (ZSTD_CCtx) and input/output buffers*/
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static void compressExpress_orDie(const char* fname, const char* oname,
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ZSTD_CCtx* cctx, void* cBuff, size_t cBuffSize, void* fBuff, size_t fBuffSize)
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{
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size_t fSize;
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loadFile_orDie(fname, &fSize, fBuff, fBuffSize);
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size_t const cSize = ZSTD_compressCCtx(cctx, cBuff, cBuffSize, fBuff, fSize, 1);
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if (ZSTD_isError(cSize)) {
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fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
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exit(8);
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}
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saveFile_orDie(oname, cBuff, cSize);
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/* success */
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printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
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}
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static void getOutFilename(const char* const filename, char* const outFilename)
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{
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memset(outFilename, 0, 1);
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strcat(outFilename, filename);
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strcat(outFilename, ".zst");
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}
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/* allocate memory for buffers big enough to compress all files
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* as well as memory for output file names (outFileName)
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*/
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void allocMemory_orDie(int argc, const char** argv, char** outFilename,
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void** cBuffer, size_t* cBufferSize, void** fBuffer, size_t* fBufferSize) {
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size_t maxFilenameLength=0;
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size_t maxFileSize = 0;
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const filename = argv[argNb];
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size_t const filenameLength = strlen(filename);
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size_t const fileSize = fsize_orDie(filename);
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if (filenameLength > maxFilenameLength) maxFilenameLength = filenameLength;
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if (fileSize > maxFileSize) maxFileSize = fileSize;
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}
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*cBufferSize = ZSTD_compressBound(maxFileSize);
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*fBufferSize = maxFileSize;
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/* allocate memory for output file name, input/output buffers for all compression tasks */
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*outFilename = (char*)malloc_orDie(maxFilenameLength + 5);
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*cBuffer = malloc_orDie(*cBufferSize);
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*fBuffer = malloc_orDie(*fBufferSize);
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}
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int main(int argc, const char** argv)
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{
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const char* const exeName = argv[0];
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if (argc<2) {
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printf("wrong arguments\n");
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printf("usage:\n");
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printf("%s FILE(s)\n", exeName);
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return 1;
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}
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/* allocate memory for buffers big enough to compress all files
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* as well as memory for output file name (outFileName)
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* fBuffer - buffer for input file data
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* cBuffer - buffer for compressed data
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*/
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char* outFilename;
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void* fBuffer;
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void* cBuffer;
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size_t fBufferSize;
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size_t cBufferSize;
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allocMemory_orDie(argc, argv, &outFilename, &cBuffer, &cBufferSize, &fBuffer, &fBufferSize);
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/* create a compression context (ZSTD_CCtx) for all compression tasks */
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ZSTD_CCtx* const cctx = ZSTD_createCCtx();
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if (cctx==NULL) { fprintf(stderr, "ZSTD_createCCtx() error \n"); exit(10); }
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/* compress files with shared context, input and output buffers */
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const inFilename = argv[argNb];
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getOutFilename(inFilename, outFilename);
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compressExpress_orDie(inFilename, outFilename, cctx, cBuffer, cBufferSize, fBuffer, fBufferSize);
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}
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/* free momery resources */
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free(outFilename);
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free(fBuffer);
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free(cBuffer);
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ZSTD_freeCCtx(cctx); /* never fails */
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printf("compressed %i files \n", argc-1);
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return 0;
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}
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