67 lines
1.9 KiB
C
67 lines
1.9 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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#include "utils.h"
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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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