Function FIO_createDResources

freebsd/contrib/zstd/programs/fileio.c:1881–1911

} dRess_t;

static dRess_t FIO_createDResources(FIO_prefs_t* const prefs, const char* dictFileName)
{
    dRess_t ress;
    memset(&ress, 0, sizeof(ress));

    if (prefs->patchFromMode)
        FIO_adjustMemLimitForPatchFromMode(prefs, UTIL_getFileSize(dictFileName), 0 /* just use the dict size */);

    /* Allocation */
    ress.dctx = ZSTD_createDStream();
    if (ress.dctx==NULL)
        EXM_THROW(60, "Error: %s : can't create ZSTD_DStream", strerror(errno));
    CHECK( ZSTD_DCtx_setMaxWindowSize(ress.dctx, prefs->memLimit) );
    CHECK( ZSTD_DCtx_setParameter(ress.dctx, ZSTD_d_forceIgnoreChecksum, !prefs->checksumFlag));
    
    ress.srcBufferSize = ZSTD_DStreamInSize();
    ress.srcBuffer = malloc(ress.srcBufferSize);
    ress.dstBufferSize = ZSTD_DStreamOutSize();
    ress.dstBuffer = malloc(ress.dstBufferSize);
    if (!ress.srcBuffer || !ress.dstBuffer)
        EXM_THROW(61, "Allocation error : not enough memory");

    /* dictionary */
    {   void* dictBuffer;
        size_t const dictBufferSize = FIO_createDictBuffer(&dictBuffer, dictFileName, prefs);
        CHECK( ZSTD_initDStream_usingDict(ress.dctx, dictBuffer, dictBufferSize) );
        free(dictBuffer);
    }

    return ress;
}

static void FIO_freeDResources(dRess_t ress)
{