111 lines
3.1 KiB
C
111 lines
3.1 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, 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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fprintf(stderr, "stat: %s : %s \n", filename, strerror(errno));
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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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fprintf(stderr, "fopen: %s : %s \n", filename, strerror(errno));
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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 + !size); /* avoid allocating size of 0 : may return NULL (implementation dependent) */
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if (buff) return buff;
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/* error */
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fprintf(stderr, "malloc: %s \n", strerror(errno));
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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); /* can't fail (read only) */
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*size = buffSize;
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return buffer;
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}
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static void decompress(const char* fname)
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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,
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"%s : original size unknown. Use streaming decompression instead.\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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size_t const dSize = ZSTD_decompress(rBuff, rSize, cBuff, cSize);
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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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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!=2) {
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printf("wrong arguments\n");
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printf("usage:\n");
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printf("%s FILE\n", exeName);
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return 1;
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}
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decompress(argv[1]);
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printf("%s correctly decoded (in memory). \n", argv[1]);
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return 0;
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}
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