/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/* JOrbis
* Copyright (C) 2000 ymnk, JCraft,Inc.
*
* Written by: 2000 ymnk<ymnk@jcraft.com>
*
* Many thanks to
* Monty <monty@xiph.org> and
* The XIPHOPHORUS Company http://www.xiph.org/ .
* JOrbis has been based on their awesome works, Vorbis codec.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package com.jcraft.jorbis;
import com.jcraft.jogg.Buffer;
import com.jcraft.jogg.Packet;
// the comments are not part of vorbis_info so that vorbis_info can be
// static storage
public class Comment {
private static byte[] _vorbis = "vorbis".getBytes();
private static byte[] _vendor = "Xiphophorus libVorbis I 20000508".getBytes();
private static final int OV_EIMPL = -130;
// unlimited user comment fields.
public byte[][] user_comments;
public int[] comment_lengths;
public int comments;
public byte[] vendor;
public void init() {
user_comments = null;
comments = 0;
vendor = null;
}
public void add(String comment) {
add(comment.getBytes());
}
private void add(byte[] comment) {
byte[][] foo = new byte[comments + 2][];
if (user_comments != null) {
System.arraycopy(user_comments, 0, foo, 0, comments);
}
user_comments = foo;
int[] goo = new int[comments + 2];
if (comment_lengths != null) {
System.arraycopy(comment_lengths, 0, goo, 0, comments);
}
comment_lengths = goo;
byte[] bar = new byte[comment.length + 1];
System.arraycopy(comment, 0, bar, 0, comment.length);
user_comments[comments] = bar;
comment_lengths[comments] = comment.length;
comments++;
user_comments[comments] = null;
}
public void add_tag(String tag, String contents) {
if (contents == null)
contents = "";
add(tag + "=" + contents);
}
static boolean tagcompare(byte[] s1, byte[] s2, int n) {
int c = 0;
byte u1, u2;
while (c < n) {
u1 = s1[c];
u2 = s2[c];
if ('Z' >= u1 && u1 >= 'A')
u1 = (byte) (u1 - 'A' + 'a');
if ('Z' >= u2 && u2 >= 'A')
u2 = (byte) (u2 - 'A' + 'a');
if (u1 != u2) {
return false;
}
c++;
}
return true;
}
public String query(String tag) {
return query(tag, 0);
}
public String query(String tag, int count) {
int foo = query(tag.getBytes(), count);
if (foo == -1)
return null;
byte[] comment = user_comments[foo];
for (int i = 0; i < comment_lengths[foo]; i++) {
if (comment[i] == '=') {
return new String(comment, i + 1, comment_lengths[foo] - (i + 1));
}
}
return null;
}
private int query(byte[] tag, int count) {
int i = 0;
int found = 0;
int fulltaglen = tag.length + 1;
byte[] fulltag = new byte[fulltaglen];
System.arraycopy(tag, 0, fulltag, 0, tag.length);
fulltag[tag.length] = (byte) '=';
for (i = 0; i < comments; i++) {
if (tagcompare(user_comments[i], fulltag, fulltaglen)) {
if (count == found) {
// We return a pointer to the data, not a copy
//return user_comments[i] + taglen + 1;
return i;
} else {
found++;
}
}
}
return -1;
}
int unpack(Buffer opb) {
int vendorlen = opb.read(32);
if (vendorlen < 0) {
clear();
return (-1);
}
vendor = new byte[vendorlen + 1];
opb.read(vendor, vendorlen);
comments = opb.read(32);
if (comments < 0) {
clear();
return (-1);
}
user_comments = new byte[comments + 1][];
comment_lengths = new int[comments + 1];
for (int i = 0; i < comments; i++) {
int len = opb.read(32);
if (len < 0) {
clear();
return (-1);
}
comment_lengths[i] = len;
user_comments[i] = new byte[len + 1];
opb.read(user_comments[i], len);
}
if (opb.read(1) != 1) {
clear();
return (-1);
}
return (0);
}
int pack(Buffer opb) {
// preamble
opb.write(0x03, 8);
opb.write(_vorbis);
// vendor
opb.write(_vendor.length, 32);
opb.write(_vendor);
// comments
opb.write(comments, 32);
if (comments != 0) {
for (int i = 0; i < comments; i++) {
if (user_comments[i] != null) {
opb.write(comment_lengths[i], 32);
opb.write(user_comments[i]);
} else {
opb.write(0, 32);
}
}
}
opb.write(1, 1);
return (0);
}
public int header_out(Packet op) {
Buffer opb = new Buffer();
opb.writeinit();
if (pack(opb) != 0)
return OV_EIMPL;
op.packet_base = new byte[opb.bytes()];
op.packet = 0;
op.bytes = opb.bytes();
System.arraycopy(opb.buffer(), 0, op.packet_base, 0, op.bytes);
op.b_o_s = 0;
op.e_o_s = 0;
op.granulepos = 0;
return 0;
}
void clear() {
for (int i = 0; i < comments; i++)
user_comments[i] = null;
user_comments = null;
vendor = null;
}
public String getVendor() {
return new String(vendor, 0, vendor.length - 1);
}
public String getComment(int i) {
if (comments <= i)
return null;
return new String(user_comments[i], 0, user_comments[i].length - 1);
}
public String toString() {
String foo = "Vendor: " + new String(vendor, 0, vendor.length - 1);
for (int i = 0; i < comments; i++) {
foo = foo + "\nComment: "
+ new String(user_comments[i], 0, user_comments[i].length - 1);
}
foo = foo + "\n";
return foo;
}
}