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/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/* JOrbis
 * Copyright (C) 2000 ymnk, JCraft,Inc.
 *  
 * Written by: 2000 ymnk
 *   
 * Many thanks to 
 *   Monty  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=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