Function writeheader

web/static/js/mp3-engine.js:2585–2597

* write N bits into the header

(gfc, val, j)

     * write N bits into the header
     */
    function writeheader(gfc, val, j) {
        var ptr = gfc.header[gfc.h_ptr].ptr;

        while (j > 0) {
            var k = Math.min(j, 8 - (ptr & 7));
            j -= k;
            /* >> 32 too large for 32 bit machines */

            gfc.header[gfc.h_ptr].buf[ptr >> 3] |= ((val >> j)) << (8 - (ptr & 7) - k);
            ptr += k;
        }
        gfc.header[gfc.h_ptr].ptr = ptr;
    }

    function CRC_update(value, crc) {
        value <<= 8;