/* -*-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.*;
// 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;
}
}