130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/**
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* Copyright 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 the license found in the
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* LICENSE-examples file in the root directory of this source tree.
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*/
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#include <stdlib.h> // malloc, exit
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#include <stdio.h> // printf
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#include <string.h> // strerror
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#include <errno.h> // errno
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#include <sys/stat.h> // stat
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#define ZSTD_STATIC_LINKING_ONLY // ZSTD_findDecompressedSize
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#include <zstd.h> // presumes zstd library is installed
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static off_t fsize_orDie(const char *filename)
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{
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struct stat st;
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if (stat(filename, &st) == 0) return st.st_size;
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/* error */
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perror(filename);
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exit(1);
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}
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static FILE* fopen_orDie(const char *filename, const char *instruction)
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{
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FILE* const inFile = fopen(filename, instruction);
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if (inFile) return inFile;
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/* error */
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perror(filename);
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exit(2);
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}
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static void* malloc_orDie(size_t size)
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{
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void* const buff = malloc(size);
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if (buff) return buff;
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/* error */
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perror("malloc");
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exit(3);
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}
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static void* loadFile_orDie(const char* fileName, size_t* size)
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{
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off_t const buffSize = fsize_orDie(fileName);
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FILE* const inFile = fopen_orDie(fileName, "rb");
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void* const buffer = malloc_orDie(buffSize);
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size_t const readSize = fread(buffer, 1, buffSize, inFile);
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if (readSize != (size_t)buffSize) {
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fprintf(stderr, "fread: %s : %s \n", fileName, strerror(errno));
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exit(4);
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}
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fclose(inFile);
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*size = buffSize;
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return buffer;
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}
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/* createDict() :
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`dictFileName` is supposed to have been created using `zstd --train` */
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static ZSTD_DDict* createDict_orDie(const char* dictFileName)
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{
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size_t dictSize;
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printf("loading dictionary %s \n", dictFileName);
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void* const dictBuffer = loadFile_orDie(dictFileName, &dictSize);
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ZSTD_DDict* const ddict = ZSTD_createDDict(dictBuffer, dictSize);
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if (ddict==NULL) { fprintf(stderr, "ZSTD_createDDict error \n"); exit(5); }
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free(dictBuffer);
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return ddict;
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}
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static void decompress(const char* fname, const ZSTD_DDict* ddict)
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{
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size_t cSize;
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void* const cBuff = loadFile_orDie(fname, &cSize);
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unsigned long long const rSize = ZSTD_findDecompressedSize(cBuff, cSize);
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if (rSize==ZSTD_CONTENTSIZE_ERROR) {
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fprintf(stderr, "%s : it was not compressed by zstd.\n", fname);
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exit(5);
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} else if (rSize==ZSTD_CONTENTSIZE_UNKNOWN) {
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fprintf(stderr, "%s : original size unknown \n", fname);
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exit(6);
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}
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void* const rBuff = malloc_orDie((size_t)rSize);
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ZSTD_DCtx* const dctx = ZSTD_createDCtx();
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if (dctx==NULL) { fprintf(stderr, "ZSTD_createDCtx() error \n"); exit(10); }
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size_t const dSize = ZSTD_decompress_usingDDict(dctx, rBuff, rSize, cBuff, cSize, ddict);
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if (dSize != rSize) {
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fprintf(stderr, "error decoding %s : %s \n", fname, ZSTD_getErrorName(dSize));
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exit(7);
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}
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/* success */
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printf("%25s : %6u -> %7u \n", fname, (unsigned)cSize, (unsigned)rSize);
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ZSTD_freeDCtx(dctx);
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free(rBuff);
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free(cBuff);
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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<3) {
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printf("wrong arguments\n");
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printf("usage:\n");
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printf("%s [FILES] dictionary\n", exeName);
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return 1;
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}
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/* load dictionary only once */
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const char* const dictName = argv[argc-1];
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ZSTD_DDict* const dictPtr = createDict_orDie(dictName);
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int u;
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for (u=1; u<argc-1; u++) decompress(argv[u], dictPtr);
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ZSTD_freeDDict(dictPtr);
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printf("All %u files correctly decoded (in memory) \n", argc-2);
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return 0;
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}
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