| /* |
| * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. |
| * All rights reserved. |
| * |
| * This source code is licensed under both the BSD-style license (found in the |
| * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| * in the COPYING file in the root directory of this source tree). |
| * You may select, at your option, one of the above-listed licenses. |
| */ |
| |
| #include <stdio.h> // printf |
| #include <stdlib.h> // free |
| #include <zstd.h> // presumes zstd library is installed |
| #include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD() |
| |
| static void decompress(const char* fname) |
| { |
| size_t cSize; |
| void* const cBuff = mallocAndLoadFile_orDie(fname, &cSize); |
| /* Read the content size from the frame header. For simplicity we require |
| * that it is always present. By default, zstd will write the content size |
| * in the header when it is known. If you can't guarantee that the frame |
| * content size is always written into the header, either use streaming |
| * decompression, or ZSTD_decompressBound(). |
| */ |
| unsigned long long const rSize = ZSTD_getFrameContentSize(cBuff, cSize); |
| CHECK(rSize != ZSTD_CONTENTSIZE_ERROR, "%s: not compressed by zstd!", fname); |
| CHECK(rSize != ZSTD_CONTENTSIZE_UNKNOWN, "%s: original size unknown!", fname); |
| |
| void* const rBuff = malloc_orDie((size_t)rSize); |
| |
| /* Decompress. |
| * If you are doing many decompressions, you may want to reuse the context |
| * and use ZSTD_decompressDCtx(). If you want to set advanced parameters, |
| * use ZSTD_DCtx_setParameter(). |
| */ |
| size_t const dSize = ZSTD_decompress(rBuff, rSize, cBuff, cSize); |
| CHECK_ZSTD(dSize); |
| /* When zstd knows the content size, it will error if it doesn't match. */ |
| CHECK(dSize == rSize, "Impossible because zstd will check this condition!"); |
| |
| /* success */ |
| printf("%25s : %6u -> %7u \n", fname, (unsigned)cSize, (unsigned)rSize); |
| |
| free(rBuff); |
| free(cBuff); |
| } |
| |
| int main(int argc, const char** argv) |
| { |
| const char* const exeName = argv[0]; |
| |
| if (argc!=2) { |
| printf("wrong arguments\n"); |
| printf("usage:\n"); |
| printf("%s FILE\n", exeName); |
| return 1; |
| } |
| |
| decompress(argv[1]); |
| |
| printf("%s correctly decoded (in memory). \n", argv[1]); |
| |
| return 0; |
| } |