/* 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 final int OV_EFAULT=-129;
private static final int OV_EIMPL=-130;
// unlimited user comment fields. libvorbis writes 'libvorbis'
// whatever vendor is set to in encode
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);
}
/*
private void add_tag(byte[] tag, byte[] contents){
byte[] foo=new byte[tag.length+contents.length+1];
int j=0;
for(int i=0; i<tag.length; i++){foo[j++]=tag[i];}
foo[j++]=(byte)'='; j++;
for(int i=0; i<contents.length; i++){foo[j++]=tag[i];}
add(foo);
}
*/
// This is more or less the same as strncasecmp - but that doesn't exist
// * everywhere, and this is a fairly trivial function, so we include it
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(u1>='A')u1=(byte)(u1-'A'+'a');
if(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 taglen = tag.length;
byte[] fulltag = new byte[taglen+2];
System.arraycopy(tag, 0, fulltag, 0, tag.length);
fulltag[tag.length]=(byte)'=';
for(i=0;i<comments;i++){
if(tagcompare(user_comments[i], fulltag, taglen)){
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){
//goto err_out;
clear();
return(-1);
}
vendor=new byte[vendorlen+1];
opb.read(vendor,vendorlen);
comments=opb.read(32);
if(comments<0){
//goto err_out;
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){
//goto err_out;
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){
//goto err_out; // EOP check
clear();
return(-1);
}
return(0);
// err_out:
// comment_clear(vc);
// return(-1);
}
int pack(Buffer opb){
byte[] temp="Xiphophorus libVorbis I 20000508".getBytes();
// preamble
opb.write(0x03,8);
opb.write(_vorbis);
// vendor
opb.write(temp.length,32);
opb.write(temp);
// 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;
}
}