/* csvorbis
* Copyright (C) 2000 ymnk, JCraft,Inc.
*
* Written by: 2000 ymnk<ymnk@jcraft.com>
* Ported to C# from JOrbis by: Mark Crichton <crichton@gimp.org>
*
* Thanks go to the JOrbis team, for licencing the code under the
* LGPL, making my job a lot easier.
*
* 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.
*/
using System;
using System.Text;
using csogg;
namespace csvorbis
{
// the comments are not part of vorbis_info so that vorbis_info can be
// static storage
public class Comment
{
private static String _vorbis="vorbis";
//private static int OV_EFAULT=-129;
private static 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)
{
Encoding AE = Encoding.UTF8;
byte[] comment_byt = AE.GetBytes(comment);
add(comment_byt);
}
private void add(byte[] comment)
{
byte[][] foo=new byte[comments+2][];
if(user_comments!=null)
{
Array.Copy(user_comments, 0, foo, 0, comments);
}
user_comments=foo;
int[] goo=new int[comments+2];
if(comment_lengths!=null)
{
Array.Copy(comment_lengths, 0, goo, 0, comments);
}
comment_lengths=goo;
byte[] bar=new byte[comment.Length+1];
Array.Copy(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 bool 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)
{
Encoding AE = Encoding.UTF8;
byte[] tag_byt = AE.GetBytes(tag);
int foo=query(tag_byt, count);
if(foo==-1)return null;
byte[] comment=user_comments[foo];
for(int i=0; i<comment_lengths[foo]; i++)
{
if(comment[i]=='=')
{
char[] comment_uni = AE.GetChars(comment);
return new String(comment_uni, 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];
Array.Copy(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;
}
internal int unpack(csBuffer 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(csBuffer opb)
{
String temp="Xiphophorus libVorbis I 20000508";
Encoding AE = Encoding.UTF8;
byte[] temp_byt = AE.GetBytes(temp);
byte[] _vorbis_byt = AE.GetBytes(_vorbis);
// preamble
opb.write(0x03,8);
opb.write(_vorbis_byt);
// vendor
opb.write(temp.Length,32);
opb.write(temp_byt);
// 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)
{
csBuffer opb=new csBuffer();
opb.writeinit();
if(pack(opb)!=0) return OV_EIMPL;
op.packet_base = new byte[opb.bytes()];
op.packet=0;
op.bytes=opb.bytes();
Array.Copy(opb.buf(), 0, op.packet_base, 0, op.bytes);
op.b_o_s=0;
op.e_o_s=0;
op.granulepos=0;
return 0;
}
internal void clear()
{
for(int i=0;i<comments;i++)
user_comments[i]=null;
user_comments=null;
vendor=null;
}
public String getVendor()
{
Encoding AE = Encoding.UTF8;
char[] vendor_uni = AE.GetChars(vendor);
return new String(vendor_uni);
}
public String getComment(int i)
{
Encoding AE = Encoding.UTF8;
if(comments<=i)return null;
char[] user_comments_uni = AE.GetChars(user_comments[i]);
return new String(user_comments_uni);
}
public String toString()
{
Encoding AE = Encoding.UTF8;
String long_string = "Vendor: " + new String(AE.GetChars(vendor));
for(int i=0; i < comments; i++)
long_string = long_string + "\nComment: " + new String(AE.GetChars(user_comments[i]));
long_string = long_string + "\n";
return long_string;
}
}
}