Function BMK_benchMemAdvancedNoAlloc

freebsd/contrib/zstd/programs/benchzstd.c:298–555

benchMem with no allocation */

/* benchMem with no allocation */
static BMK_benchOutcome_t
BMK_benchMemAdvancedNoAlloc(
                    const void** srcPtrs, size_t* srcSizes,
                    void** cPtrs, size_t* cCapacities, size_t* cSizes,
                    void** resPtrs, size_t* resSizes,
                    void** resultBufferPtr, void* compressedBuffer,
                    size_t maxCompressedSize,
                    BMK_timedFnState_t* timeStateCompress,
                    BMK_timedFnState_t* timeStateDecompress,

                    const void* srcBuffer, size_t srcSize,
                    const size_t* fileSizes, unsigned nbFiles,
                    const int cLevel,
                    const ZSTD_compressionParameters* comprParams,
                    const void* dictBuffer, size_t dictBufferSize,
                    ZSTD_CCtx* cctx, ZSTD_DCtx* dctx,
                    int displayLevel, const char* displayName,
                    const BMK_advancedParams_t* adv)
{
    size_t const blockSize = ((adv->blockSize>=32 && (adv->mode != BMK_decodeOnly)) ? adv->blockSize : srcSize) + (!srcSize);  /* avoid div by 0 */
    BMK_benchResult_t benchResult;
    size_t const loadedCompressedSize = srcSize;
    size_t cSize = 0;
    double ratio = 0.;
    U32 nbBlocks;

    assert(cctx != NULL); assert(dctx != NULL);

    /* init */
    memset(&benchResult, 0, sizeof(benchResult));
    if (strlen(displayName)>17) displayName += strlen(displayName) - 17;   /* display last 17 characters */
    if (adv->mode == BMK_decodeOnly) {  /* benchmark only decompression : source must be already compressed */
        const char* srcPtr = (const char*)srcBuffer;
        U64 totalDSize64 = 0;
        U32 fileNb;
        for (fileNb=0; fileNb<nbFiles; fileNb++) {
            U64 const fSize64 = ZSTD_findDecompressedSize(srcPtr, fileSizes[fileNb]);
            if (fSize64==0) RETURN_ERROR(32, BMK_benchOutcome_t, "Impossible to determine original size ");
            totalDSize64 += fSize64;
            srcPtr += fileSizes[fileNb];
        }
        {   size_t const decodedSize = (size_t)totalDSize64;
            assert((U64)decodedSize == totalDSize64);   /* check overflow */
            free(*resultBufferPtr);
            *resultBufferPtr = malloc(decodedSize);
            if (!(*resultBufferPtr)) {
                RETURN_ERROR(33, BMK_benchOutcome_t, "not enough memory");
            }
            if (totalDSize64 > decodedSize) {  /* size_t overflow */
                free(*resultBufferPtr);
                RETURN_ERROR(32, BMK_benchOutcome_t, "original size is too large");
            }
            cSize = srcSize;
            srcSize = decodedSize;
            ratio = (double)srcSize / (double)cSize;
        }
    }