static void decompress(const char* fname)
{
size_t cSize;
void* const cBuff = mallocAndLoadFile_orDie(fname, &cSize);
unsigned long long const rSize = ZSTD_findDecompressedSize(cBuff, cSize);
if (rSize==ZSTD_CONTENTSIZE_ERROR) {
fprintf(stderr, "%s : it was not compressed by zstd.\n", fname);
exit(5);
} else if (rSize==ZSTD_CONTENTSIZE_UNKNOWN) {
fprintf(stderr,
"%s : original size unknown. Use streaming decompression instead.\n", fname);
exit(6);
}
void* const rBuff = malloc_orDie((size_t)rSize);
size_t const dSize = ZSTD_decompress(rBuff, rSize, cBuff, cSize);
if (dSize != rSize) {
fprintf(stderr, "error decoding %s : %s \n", fname, ZSTD_getErrorName(dSize));
exit(7);
}
/* success */
printf("%25s : %6u -> %7u \n", fname, (unsigned)cSize, (unsigned)rSize);
free(rBuff);
free(cBuff);
}
static void decompress(const char* fname, const ZSTD_DDict* ddict)
{
size_t cSize;
void* const cBuff = loadFile_orDie(fname, &cSize);
unsigned long long const rSize = ZSTD_findDecompressedSize(cBuff, cSize);
if (rSize==ZSTD_CONTENTSIZE_ERROR) {
fprintf(stderr, "%s : it was not compressed by zstd.\n", fname);
exit(5);
} else if (rSize==ZSTD_CONTENTSIZE_UNKNOWN) {
fprintf(stderr, "%s : original size unknown \n", fname);
exit(6);
}
void* const rBuff = malloc_orDie((size_t)rSize);
ZSTD_DCtx* const dctx = ZSTD_createDCtx();
if (dctx==NULL) { fprintf(stderr, "ZSTD_createDCtx() error \n"); exit(10); }
size_t const dSize = ZSTD_decompress_usingDDict(dctx, rBuff, rSize, cBuff, cSize, ddict);
if (dSize != rSize) {
fprintf(stderr, "error decoding %s : %s \n", fname, ZSTD_getErrorName(dSize));
exit(7);
}
/* success */
printf("%25s : %6u -> %7u \n", fname, (unsigned)cSize, (unsigned)rSize);
ZSTD_freeDCtx(dctx);
free(rBuff);
free(cBuff);
}
static ezResult DecompressZStd(ezArrayPtr<const ezUInt8> pCompressedData, ezDynamicArray<ezUInt8>& out_Data)
{
size_t uiSize = ZSTD_findDecompressedSize(pCompressedData.GetPtr(), pCompressedData.GetCount());
if (uiSize == ZSTD_CONTENTSIZE_ERROR)
{
ezLog::Error("Can't decompress since it wasn't compressed with ZStd");
return EZ_FAILURE;
}
else if (uiSize == ZSTD_CONTENTSIZE_UNKNOWN)
{
ezLog::Error("Can't decompress since the original size can't be determined, was the data compressed using the streaming variant?");
return EZ_FAILURE;
}
if (uiSize > std::numeric_limits<ezUInt32>::max())
{
ezLog::Error("Can't compress since the output container can't hold enough elements ({0})", static_cast<ezUInt64>(uiSize));
return EZ_FAILURE;
}
out_Data.SetCountUninitialized(static_cast<ezUInt32>(uiSize));
size_t const uiActualSize = ZSTD_decompress(out_Data.GetData(), uiSize, pCompressedData.GetPtr(), pCompressedData.GetCount());
if (uiActualSize != uiSize)
{
ezLog::Error("Error during ZStd decompression: '{0}'.", ZSTD_getErrorName(uiActualSize));
return EZ_FAILURE;
}
return EZ_SUCCESS;
}
