Method: Zlib::Deflate#params

Defined in:
zlib.c

#params(v_level, v_strategy) ⇒ Object

call-seq: params(level, strategy)

Changes the parameters of the deflate stream to allow changes between different types of data that require different types of compression. Any unprocessed data is flushed before changing the params.

See Zlib::Deflate.new for a description of level and strategy.



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# File 'zlib.c', line 1765

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;
    long filled;

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

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

    return Qnil;
}