method

params

v1_9_3_125 - Show latest stable - Class: Zlib::Deflate

params(p1, p2)

public

Changes the parameters of the deflate stream. See zlib.h for details. The output from the stream by changing the params is preserved in output buffer.

`level`	An Integer compression level between BEST_SPEED and BEST_COMPRESSION
`strategy`	A parameter to tune the compression algorithm. Use the DEFAULT_STRATEGY for normal data, FILTERED for data produced by a filter (or predictor), HUFFMAN_ONLY to force Huffman encoding only (no string match).

static VALUE
rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy)
{
    struct zstream *z = get_zstream(obj);
    int level, strategy;
    int err;
    uInt n;

    level = ARG_LEVEL(v_level);
    strategy = ARG_STRATEGY(v_strategy);

    n = z->stream.avail_out;
    err = deflateParams(&z->stream, level, strategy);
    z->buf_filled += n - z->stream.avail_out;
    while (err == Z_BUF_ERROR) {
        rb_warning("deflateParams() returned Z_BUF_ERROR");
        zstream_expand_buffer(z);
        n = z->stream.avail_out;
        err = deflateParams(&z->stream, level, strategy);
        z->buf_filled += n - z->stream.avail_out;
    }
    if (err != Z_OK) {
        raise_zlib_error(err, z->stream.msg);
    }

    return Qnil;
}

params

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