| 14 | #include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD() |
| 15 | |
| 16 | static void decompress(const char* fname) |
| 17 | { |
| 18 | size_t cSize; |
| 19 | void* const cBuff = mallocAndLoadFile_orDie(fname, &cSize); |
| 20 | /* Read the content size from the frame header. For simplicity we require |
| 21 | * that it is always present. By default, zstd will write the content size |
| 22 | * in the header when it is known. If you can't guarantee that the frame |
| 23 | * content size is always written into the header, either use streaming |
| 24 | * decompression, or ZSTD_decompressBound(). |
| 25 | */ |
| 26 | unsigned long long const rSize = ZSTD_getFrameContentSize(cBuff, cSize); |
| 27 | CHECK(rSize != ZSTD_CONTENTSIZE_ERROR, "%s: not compressed by zstd!", fname); |
| 28 | CHECK(rSize != ZSTD_CONTENTSIZE_UNKNOWN, "%s: original size unknown!", fname); |
| 29 | |
| 30 | void* const rBuff = malloc_orDie((size_t)rSize); |
| 31 | |
| 32 | /* Decompress. |
| 33 | * If you are doing many decompressions, you may want to reuse the context |
| 34 | * and use ZSTD_decompressDCtx(). If you want to set advanced parameters, |
| 35 | * use ZSTD_DCtx_setParameter(). |
| 36 | */ |
| 37 | size_t const dSize = ZSTD_decompress(rBuff, rSize, cBuff, cSize); |
| 38 | CHECK_ZSTD(dSize); |
| 39 | /* When zstd knows the content size, it will error if it doesn't match. */ |
| 40 | CHECK(dSize == rSize, "Impossible because zstd will check this condition!"); |
| 41 | |
| 42 | /* success */ |
| 43 | printf("%25s : %6u -> %7u \n", fname, (unsigned)cSize, (unsigned)rSize); |
| 44 | |
| 45 | free(rBuff); |
| 46 | free(cBuff); |
| 47 | } |
| 48 | |
| 49 | int main(int argc, const char** argv) |
| 50 | { |