294 lines
6.2 KiB
Java
294 lines
6.2 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/* JOrbis
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* Copyright (C) 2000 ymnk, JCraft,Inc.
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*
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* Written by: 2000 ymnk<ymnk@jcraft.com>
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*
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* Many thanks to
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* Monty <monty@xiph.org> and
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* The XIPHOPHORUS Company http://www.xiph.org/ .
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* JOrbis has been based on their awesome works, Vorbis codec.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License
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* as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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package com.jcraft.jogg;
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public class Buffer {
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private static final int BUFFER_INCREMENT = 256;
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private static final int[] mask = { 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f,
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0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff,
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0x00007fff, 0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff, 0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
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0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff, 0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
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0xffffffff };
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int ptr = 0;
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byte[] buffer = null;
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int endbit = 0;
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int endbyte = 0;
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int storage = 0;
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public void writeinit() {
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buffer = new byte[BUFFER_INCREMENT];
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ptr = 0;
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buffer[0] = (byte) '\0';
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storage = BUFFER_INCREMENT;
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}
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public void write(byte[] s) {
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for (int i = 0; i < s.length; i++) {
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if (s[i] == 0)
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break;
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write(s[i], 8);
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}
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}
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public void read(byte[] s, int bytes) {
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int i = 0;
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while (bytes-- != 0) {
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s[i++] = (byte) (read(8));
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}
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}
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void reset() {
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ptr = 0;
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buffer[0] = (byte) '\0';
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endbit = endbyte = 0;
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}
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public void writeclear() {
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buffer = null;
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}
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public void readinit(byte[] buf, int bytes) {
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readinit(buf, 0, bytes);
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}
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public void readinit(byte[] buf, int start, int bytes) {
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ptr = start;
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buffer = buf;
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endbit = endbyte = 0;
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storage = bytes;
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}
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public void write(int value, int bits) {
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if (endbyte + 4 >= storage) {
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byte[] foo = new byte[storage + BUFFER_INCREMENT];
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System.arraycopy(buffer, 0, foo, 0, storage);
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buffer = foo;
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storage += BUFFER_INCREMENT;
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}
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value &= mask[bits];
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bits += endbit;
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buffer[ptr] |= (byte) (value << endbit);
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if (bits >= 8) {
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buffer[ptr + 1] = (byte) (value >>> (8 - endbit));
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if (bits >= 16) {
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buffer[ptr + 2] = (byte) (value >>> (16 - endbit));
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if (bits >= 24) {
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buffer[ptr + 3] = (byte) (value >>> (24 - endbit));
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if (bits >= 32) {
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if (endbit > 0)
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buffer[ptr + 4] = (byte) (value >>> (32 - endbit));
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else
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buffer[ptr + 4] = 0;
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}
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}
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}
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}
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endbyte += bits / 8;
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ptr += bits / 8;
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endbit = bits & 7;
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}
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public int look(int bits) {
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int ret;
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int m = mask[bits];
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bits += endbit;
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if (endbyte + 4 >= storage) {
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if (endbyte + (bits - 1) / 8 >= storage)
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return (-1);
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}
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ret = ((buffer[ptr]) & 0xff) >>> endbit;
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if (bits > 8) {
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ret |= ((buffer[ptr + 1]) & 0xff) << (8 - endbit);
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if (bits > 16) {
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ret |= ((buffer[ptr + 2]) & 0xff) << (16 - endbit);
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if (bits > 24) {
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ret |= ((buffer[ptr + 3]) & 0xff) << (24 - endbit);
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if (bits > 32 && endbit != 0) {
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ret |= ((buffer[ptr + 4]) & 0xff) << (32 - endbit);
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}
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}
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}
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}
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return (m & ret);
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}
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public int look1() {
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if (endbyte >= storage)
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return (-1);
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return ((buffer[ptr] >> endbit) & 1);
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}
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public void adv(int bits) {
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bits += endbit;
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ptr += bits / 8;
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endbyte += bits / 8;
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endbit = bits & 7;
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}
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public void adv1() {
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++endbit;
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if (endbit > 7) {
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endbit = 0;
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ptr++;
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endbyte++;
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}
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}
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public int read(int bits) {
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int ret;
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int m = mask[bits];
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bits += endbit;
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if (endbyte + 4 >= storage) {
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ret = -1;
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if (endbyte + (bits - 1) / 8 >= storage) {
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ptr += bits / 8;
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endbyte += bits / 8;
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endbit = bits & 7;
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return (ret);
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}
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}
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ret = ((buffer[ptr]) & 0xff) >>> endbit;
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if (bits > 8) {
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ret |= ((buffer[ptr + 1]) & 0xff) << (8 - endbit);
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if (bits > 16) {
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ret |= ((buffer[ptr + 2]) & 0xff) << (16 - endbit);
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if (bits > 24) {
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ret |= ((buffer[ptr + 3]) & 0xff) << (24 - endbit);
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if (bits > 32 && endbit != 0) {
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ret |= ((buffer[ptr + 4]) & 0xff) << (32 - endbit);
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}
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}
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}
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}
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ret &= m;
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ptr += bits / 8;
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endbyte += bits / 8;
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endbit = bits & 7;
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return (ret);
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}
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public int readB(int bits) {
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int ret;
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int m = 32 - bits;
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bits += endbit;
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if (endbyte + 4 >= storage) {
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/* not the main path */
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ret = -1;
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if (endbyte * 8 + bits > storage * 8) {
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ptr += bits / 8;
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endbyte += bits / 8;
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endbit = bits & 7;
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return (ret);
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}
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}
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ret = (buffer[ptr] & 0xff) << (24 + endbit);
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if (bits > 8) {
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ret |= (buffer[ptr + 1] & 0xff) << (16 + endbit);
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if (bits > 16) {
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ret |= (buffer[ptr + 2] & 0xff) << (8 + endbit);
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if (bits > 24) {
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ret |= (buffer[ptr + 3] & 0xff) << (endbit);
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if (bits > 32 && (endbit != 0))
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ret |= (buffer[ptr + 4] & 0xff) >> (8 - endbit);
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}
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}
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}
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ret = (ret >>> (m >> 1)) >>> ((m + 1) >> 1);
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ptr += bits / 8;
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endbyte += bits / 8;
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endbit = bits & 7;
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return (ret);
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}
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public int read1() {
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int ret;
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if (endbyte >= storage) {
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ret = -1;
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endbit++;
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if (endbit > 7) {
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endbit = 0;
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ptr++;
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endbyte++;
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}
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return (ret);
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}
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ret = (buffer[ptr] >> endbit) & 1;
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endbit++;
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if (endbit > 7) {
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endbit = 0;
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ptr++;
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endbyte++;
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}
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return (ret);
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}
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public int bytes() {
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return (endbyte + (endbit + 7) / 8);
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}
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public int bits() {
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return (endbyte * 8 + endbit);
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}
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public byte[] buffer() {
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return (buffer);
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}
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public static int ilog(int v) {
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int ret = 0;
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while (v > 0) {
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ret++;
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v >>>= 1;
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}
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return (ret);
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}
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public static void report(String in) {
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System.err.println(in);
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System.exit(1);
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}
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}
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