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/***************************************************************************
copyright : (C) 2005 by Brian Nickel
email : brian.nickel@gmail.com
based on : wvfile.cpp from libtunepimp
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
* USA *
***************************************************************************/
using System.Collections;
using System;
namespace TagLib.WavPack
{
[SupportedMimeType("taglib/wv", "wv")]
[SupportedMimeType("audio/x-wavpack")]
public class File : TagLib.File
{
//////////////////////////////////////////////////////////////////////////
// private properties
//////////////////////////////////////////////////////////////////////////
private Ape.Tag ape_tag;
private Id3v1.Tag id3v1_tag;
private CombinedTag tag;
private Properties properties;
//////////////////////////////////////////////////////////////////////////
// public methods
//////////////////////////////////////////////////////////////////////////
public File (string file, Properties.ReadStyle properties_style) : base (file)
{
ape_tag = null;
id3v1_tag = null;
tag = new CombinedTag ();
properties = null;
try {Mode = AccessMode.Read;}
catch {return;}
Read (properties_style);
Mode = AccessMode.Closed;
}
public File (string file) : this (file, Properties.ReadStyle.Average)
{
}
public override void Save ()
{
if(IsReadOnly) {
throw new ReadOnlyException();
}
Mode = AccessMode.Write;
// Update ID3v1 tag
long id3v1_location = FindId3v1 ();
if (id3v1_tag != null)
{
if (id3v1_location >= 0)
Insert (id3v1_tag.Render (), id3v1_location, 128);
else
{
Seek (0, System.IO.SeekOrigin.End);
id3v1_location = Tell;
WriteBlock (id3v1_tag.Render ());
}
}
else if(id3v1_location >= 0)
{
RemoveBlock (id3v1_location, 128);
id3v1_location = -1;
}
// Update APE tag
long ape_location = FindApe (id3v1_location != -1);
long ape_size = 0;
if (ape_location != -1)
{
Seek (ape_location);
ape_size = (new Ape.Footer (ReadBlock ((int) Ape.Footer.Size))).CompleteTagSize;
ape_location = ape_location + Ape.Footer.Size - ape_size;
}
if (ape_tag != null)
{
if (ape_location >= 0)
Insert (ape_tag.Render (), ape_location, ape_size);
else
{
if (id3v1_location >= 0)
Insert (ape_tag.Render (), id3v1_location, 0);
else
{
Seek (0, System.IO.SeekOrigin.End);
WriteBlock (ape_tag.Render ());
}
}
}
else if (ape_location >= 0)
RemoveBlock (ape_location, ape_size);
Mode = AccessMode.Closed;
}
public override TagLib.Tag GetTag (TagTypes type, bool create)
{
switch (type)
{
case TagTypes.Id3v1:
{
if (create && id3v1_tag == null)
{
id3v1_tag = new Id3v1.Tag ();
if (tag != null)
TagLib.Tag.Duplicate (tag, id3v1_tag, true);
tag.SetTags (ape_tag, id3v1_tag);
}
return id3v1_tag;
}
case TagTypes.Ape:
{
if (create && ape_tag == null)
{
ape_tag = new Ape.Tag ();
if (tag != null)
TagLib.Tag.Duplicate (tag, ape_tag, true);
tag.SetTags (ape_tag, id3v1_tag);
}
return ape_tag;
}
default:
return null;
}
}
public void Remove (TagTypes types)
{
if ((types & TagTypes.Id3v1) != 0)
id3v1_tag = null;
if ((types & TagTypes.Ape) != 0)
ape_tag = null;
tag.SetTags (ape_tag, id3v1_tag);
}
public void Remove ()
{
Remove (TagTypes.AllTags);
}
//////////////////////////////////////////////////////////////////////////
// public properties
//////////////////////////////////////////////////////////////////////////
public override TagLib.Tag Tag {get {return tag;}}
public override TagLib.AudioProperties AudioProperties {get {return properties;}}
//////////////////////////////////////////////////////////////////////////
// private methods
//////////////////////////////////////////////////////////////////////////
private void Read (Properties.ReadStyle properties_style)
{
// Look for an ID3v1 tag
long id3v1_location = FindId3v1 ();
if (id3v1_location >= 0)
id3v1_tag = new Id3v1.Tag (this, id3v1_location);
// Look for an APE tag
long ape_location = FindApe (id3v1_location != -1);
if (ape_location >= 0)
ape_tag = new Ape.Tag (this, ape_location);
tag.SetTags (ape_tag, id3v1_tag);
GetTag (TagTypes.Ape, true);
// Look for MPC metadata
if (properties_style != Properties.ReadStyle.None)
{
Seek (0);
properties = new Properties (ReadBlock ((int) Properties.HeaderSize),
ape_location + Ape.Footer.Size - ape_tag.Footer.CompleteTagSize);
}
}
private long FindApe (bool has_id3v1)
{
if (!IsValid)
return -1;
if(has_id3v1)
Seek (-160, System.IO.SeekOrigin.End);
else
Seek (-32, System.IO.SeekOrigin.End);
long p = Tell;
if(ReadBlock (8) == Ape.Tag.FileIdentifier)
return p;
return -1;
}
private long FindId3v1 ()
{
if (!IsValid)
return -1;
Seek (-128, System.IO.SeekOrigin.End);
long p = Tell;
if(ReadBlock (3) == Id3v1.Tag.FileIdentifier)
return p;
return -1;
}
}
}
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