1 /* 2 * Copyright (c) 2016-2020 Yann Collet, Facebook, Inc. 3 * All rights reserved. 4 * 5 * This source code is licensed under both the BSD-style license (found in the 6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found 7 * in the COPYING file in the root directory of this source tree). 8 * You may select, at your option, one of the above-listed licenses. 9 */ 10 #include <stdio.h> // printf 11 #include <stdlib.h> // free 12 #include <string.h> // memset, strcat 13 #include <zstd.h> // presumes zstd library is installed 14 #include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD() 15 16 /* createDict() : 17 `dictFileName` is supposed to have been created using `zstd --train` */ 18 static ZSTD_CDict* createCDict_orDie(const char* dictFileName, int cLevel) 19 { 20 size_t dictSize; 21 printf("loading dictionary %s \n", dictFileName); 22 void* const dictBuffer = mallocAndLoadFile_orDie(dictFileName, &dictSize); 23 ZSTD_CDict* const cdict = ZSTD_createCDict(dictBuffer, dictSize, cLevel); 24 CHECK(cdict != NULL, "ZSTD_createCDict() failed!"); 25 free(dictBuffer); 26 return cdict; 27 } 28 29 30 static void compress(const char* fname, const char* oname, const ZSTD_CDict* cdict) 31 { 32 size_t fSize; 33 void* const fBuff = mallocAndLoadFile_orDie(fname, &fSize); 34 size_t const cBuffSize = ZSTD_compressBound(fSize); 35 void* const cBuff = malloc_orDie(cBuffSize); 36 37 /* Compress using the dictionary. 38 * This function writes the dictionary id, and content size into the header. 39 * But, it doesn't use a checksum. You can control these options using the 40 * advanced API: ZSTD_CCtx_setParameter(), ZSTD_CCtx_refCDict(), 41 * and ZSTD_compress2(). 42 */ 43 ZSTD_CCtx* const cctx = ZSTD_createCCtx(); 44 CHECK(cctx != NULL, "ZSTD_createCCtx() failed!"); 45 size_t const cSize = ZSTD_compress_usingCDict(cctx, cBuff, cBuffSize, fBuff, fSize, cdict); 46 CHECK_ZSTD(cSize); 47 48 saveFile_orDie(oname, cBuff, cSize); 49 50 /* success */ 51 printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname); 52 53 ZSTD_freeCCtx(cctx); /* never fails */ 54 free(fBuff); 55 free(cBuff); 56 } 57 58 59 static char* createOutFilename_orDie(const char* filename) 60 { 61 size_t const inL = strlen(filename); 62 size_t const outL = inL + 5; 63 void* outSpace = malloc_orDie(outL); 64 memset(outSpace, 0, outL); 65 strcat(outSpace, filename); 66 strcat(outSpace, ".zst"); 67 return (char*)outSpace; 68 } 69 70 int main(int argc, const char** argv) 71 { 72 const char* const exeName = argv[0]; 73 int const cLevel = 3; 74 75 if (argc<3) { 76 fprintf(stderr, "wrong arguments\n"); 77 fprintf(stderr, "usage:\n"); 78 fprintf(stderr, "%s [FILES] dictionary\n", exeName); 79 return 1; 80 } 81 82 /* load dictionary only once */ 83 const char* const dictName = argv[argc-1]; 84 ZSTD_CDict* const dictPtr = createCDict_orDie(dictName, cLevel); 85 86 int u; 87 for (u=1; u<argc-1; u++) { 88 const char* inFilename = argv[u]; 89 char* const outFilename = createOutFilename_orDie(inFilename); 90 compress(inFilename, outFilename, dictPtr); 91 free(outFilename); 92 } 93 94 ZSTD_freeCDict(dictPtr); 95 printf("All %u files compressed. \n", argc-2); 96 return 0; 97 } 98