Method writeheader

src/main/java/mp3/BitStream.java:209–221

write N bits into the header

(final LameInternalFlags gfc, final int val, int j)

	 * write N bits into the header
	 */
	private void writeheader(final LameInternalFlags gfc, final int val, int j) {
		int ptr = gfc.header[gfc.h_ptr].ptr;

		while (j > 0) {
			final int k = Math.min(j, 8 - (ptr & 7));
			j -= k;
			assert (j < MAX_LENGTH); /* >> 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;
	}

	private int CRC_update(int value, int crc) {
		value <<= 8;