Module: Zstd::ContextLess

Defined in:
ext/extzstd.c

Class Method Summary collapse

Class Method Details

.decode(src, dest, maxdest) ⇒ Object

RETURN

dest

src (string)
dest (string)
maxdest (integer or nil)


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# File 'ext/extzstd.c', line 603

static VALUE
less_s_decode(VALUE mod, VALUE src, VALUE dest, VALUE maxdest, VALUE predict)
{
    const char *q;
    size_t qsize;
    aux_string_pointer(src, &q, &qsize);

    char *r;
    size_t rsize = (NIL_P(maxdest)) ? ZSTD_getFrameContentSize(q, qsize) : NUM2SIZET(maxdest);
    aux_string_expand_pointer(dest, &r, rsize);
    rb_obj_infect(dest, src);

    const char *d;
    size_t dsize;
    aux_string_pointer_with_nil(predict, &d, &dsize);
    rb_obj_infect(dest, predict);

    ZSTD_DCtx *z = ZSTD_createDCtx();
    size_t s = ZSTD_decompress_usingDict(z, r, rsize, q, qsize, d, dsize);
    ZSTD_freeDCtx(z);
    extzstd_check_error(s);
    rb_str_set_len(dest, s);

    return dest;
}

.encode(src, dest, maxdest, params) ⇒ Object

RETURN

dest

src (string)
dest (string)
maxdest (integer or nil)
params (nil, integer or Zstd::Parameters)


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# File 'ext/extzstd.c', line 527

static VALUE
less_s_encode(VALUE mod, VALUE src, VALUE dest, VALUE maxdest, VALUE predict, VALUE params)
{
    const char *q;
    size_t qsize;
    aux_string_pointer(src, &q, &qsize);

    char *r;
    size_t rsize = (NIL_P(maxdest)) ? ZSTD_compressBound(qsize) : NUM2SIZET(maxdest);
    aux_string_expand_pointer(dest, &r, rsize);
    rb_obj_infect(dest, src);

    const char *d;
    size_t dsize;
    aux_string_pointer_with_nil(predict, &d, &dsize);
    rb_obj_infect(dest, predict);

    if (extzstd_params_p(params)) {
        /*
         * ZSTDLIB_API size_t ZSTD_compress2( ZSTD_CCtx* cctx,
         *                                    void* dst, size_t dstCapacity,
         *                              const void* src, size_t srcSize);
         * ZSTDLIB_API size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value);
         * ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize);
         */
        ZSTD_CCtx *zstd = ZSTD_createCCtx();
        ZSTD_parameters *param = extzstd_getparams(params);

        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_windowLog, param->cParams.windowLog);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_chainLog, param->cParams.chainLog);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_hashLog, param->cParams.hashLog);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_searchLog, param->cParams.searchLog);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_minMatch, param->cParams.minMatch);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_targetLength, param->cParams.targetLength);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_strategy, param->cParams.strategy);

        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_contentSizeFlag, param->fParams.contentSizeFlag);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_checksumFlag, param->fParams.checksumFlag);
        aux_ZSTD_CCtx_setParameter(zstd, ZSTD_c_dictIDFlag, !param->fParams.noDictIDFlag);

        //aux_ZSTD_CCtx_setPledgedSrcSize(zstd, (unsigned long long)qsize);

        aux_ZSTD_CCtx_loadDictionary(zstd, d, dsize);

        size_t s = ZSTD_compress2(zstd, r, rsize, q, qsize);
        ZSTD_freeCCtx(zstd);
        extzstd_check_error(s);
        rb_str_set_len(dest, s);
        return dest;
    } else {
        /*
         * ZSTDLIB_API size_t ZSTD_compress_usingDict(
         *      ZSTD_CCtx* ctx,
         *      void* dst, size_t dstCapacity,
         *      const void* src, size_t srcSize,
         *      const void* dict,size_t dictSize,
         *      int compressionLevel);
         */
        ZSTD_CCtx *zstd = ZSTD_createCCtx();
        size_t s = ZSTD_compress_usingDict(zstd, r, rsize, q, qsize, d, dsize, aux_num2int(params, 0));
        ZSTD_freeCCtx(zstd);
        extzstd_check_error(s);
        rb_str_set_len(dest, s);
        return dest;
    }
}