Method: Zstd::Parameters#initialize

Defined in:

ext/extzstd.c

#initialize(preset_level = 1, srcsize_hint = 0, dictsize = 0, opts = {}) ⇒ Object

Initialize struct ZSTD_parameters of C layer.

preset_level = 1

srcsize_hint = 0

opts windowlog: nil

opts contentlog: nil

opts hashlog: nil

opts searchlog: nil

opts minmatch: nil

opts targetlength: nil

opts strategy: nil

# File 'ext/extzstd.c', line 258

static VALUE
params_init(int argc, VALUE argv[], VALUE v)
{
    ZSTD_parameters *p = getparams(v);
    uint64_t sizehint;
    size_t dictsize;
    int level;
    VALUE opts = Qnil;

    argc = rb_scan_args(argc, argv, "03:", NULL, NULL, NULL, &opts);
    level = argc > 0 ? aux_num2int(argv[0], 0) : 0;
    sizehint = argc > 1 ? aux_num2int_u64(argv[1], 0) : 0;
    dictsize = argc > 2 ? aux_num2int_u64(argv[2], 0) : 0;

    *p = ZSTD_getParams(level, sizehint, dictsize);

    if (!NIL_P(opts)) {
#define SETUP_PARAM(var, opts, key, converter)                          \
        do {                                                            \
            VALUE tmp = rb_hash_lookup(opts, ID2SYM(rb_intern(key)));   \
            if (!NIL_P(tmp)) {                                          \
                var = converter(tmp);                                   \
            }                                                           \
        } while (0)                                                     \

        SETUP_PARAM(p->cParams.windowLog, opts, "windowlog", NUM2UINT);
        SETUP_PARAM(p->cParams.chainLog, opts, "chainlog", NUM2UINT);
        SETUP_PARAM(p->cParams.hashLog, opts, "hashlog", NUM2UINT);
        SETUP_PARAM(p->cParams.searchLog, opts, "searchlog", NUM2UINT);
        SETUP_PARAM(p->cParams.minMatch, opts, "minmatch", NUM2UINT);
        SETUP_PARAM(p->cParams.targetLength, opts, "targetlength", NUM2UINT);
        SETUP_PARAM(p->cParams.strategy, opts, "strategy", NUM2UINT);
        SETUP_PARAM(p->fParams.contentSizeFlag, opts, "contentsize", RTEST);
        SETUP_PARAM(p->fParams.checksumFlag, opts, "checksum", RTEST);
        SETUP_PARAM(p->fParams.noDictIDFlag, opts, "nodictid", RTEST);
#undef SETUP_PARAM
    }

    return v;
}