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/***************************************************************************
copyright : (C) 2002 - 2008 by Scott Wheeler
email : wheeler@kde.org
***************************************************************************/
/***************************************************************************
* 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 *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include <tdebug.h>
#include <tfile.h>
#include "id3v1tag.h"
#include "id3v1genres.h"
using namespace TagLib;
using namespace ID3v1;
class ID3v1::Tag::TagPrivate
{
public:
TagPrivate() : file(0), tagOffset(-1), track(0), genre(255) {}
File *file;
long tagOffset;
String title;
String artist;
String album;
String year;
String comment;
uchar track;
uchar genre;
static const StringHandler *stringHandler;
};
const ID3v1::StringHandler *ID3v1::Tag::TagPrivate::stringHandler = new StringHandler;
////////////////////////////////////////////////////////////////////////////////
// StringHandler implementation
////////////////////////////////////////////////////////////////////////////////
String ID3v1::StringHandler::parse(const ByteVector &data) const
{
return String(data, String::Latin1).stripWhiteSpace();
}
ByteVector ID3v1::StringHandler::render(const String &s) const
{
if(!s.isLatin1())
{
return ByteVector();
}
return s.data(String::Latin1);
}
////////////////////////////////////////////////////////////////////////////////
// public methods
////////////////////////////////////////////////////////////////////////////////
ID3v1::Tag::Tag() : TagLib::Tag()
{
d = new TagPrivate;
}
ID3v1::Tag::Tag(File *file, long tagOffset) : TagLib::Tag()
{
d = new TagPrivate;
d->file = file;
d->tagOffset = tagOffset;
read();
}
ID3v1::Tag::~Tag()
{
delete d;
}
ByteVector ID3v1::Tag::render() const
{
ByteVector data;
data.append(fileIdentifier());
data.append(TagPrivate::stringHandler->render(d->title).resize(30));
data.append(TagPrivate::stringHandler->render(d->artist).resize(30));
data.append(TagPrivate::stringHandler->render(d->album).resize(30));
data.append(TagPrivate::stringHandler->render(d->year).resize(4));
data.append(TagPrivate::stringHandler->render(d->comment).resize(28));
data.append(char(0));
data.append(char(d->track));
data.append(char(d->genre));
return data;
}
ByteVector ID3v1::Tag::fileIdentifier()
{
return ByteVector::fromCString("TAG");
}
String ID3v1::Tag::title() const
{
return d->title;
}
String ID3v1::Tag::artist() const
{
return d->artist;
}
String ID3v1::Tag::album() const
{
return d->album;
}
String ID3v1::Tag::comment() const
{
return d->comment;
}
String ID3v1::Tag::genre() const
{
return ID3v1::genre(d->genre);
}
TagLib::uint ID3v1::Tag::year() const
{
return d->year.toInt();
}
TagLib::uint ID3v1::Tag::track() const
{
return d->track;
}
void ID3v1::Tag::setTitle(const String &s)
{
d->title = s;
}
void ID3v1::Tag::setArtist(const String &s)
{
d->artist = s;
}
void ID3v1::Tag::setAlbum(const String &s)
{
d->album = s;
}
void ID3v1::Tag::setComment(const String &s)
{
d->comment = s;
}
void ID3v1::Tag::setGenre(const String &s)
{
d->genre = ID3v1::genreIndex(s);
}
void ID3v1::Tag::setYear(uint i)
{
d->year = i > 0 ? String::number(i) : String::null;
}
void ID3v1::Tag::setTrack(uint i)
{
d->track = i < 256 ? i : 0;
}
void ID3v1::Tag::setStringHandler(const StringHandler *handler)
{
delete TagPrivate::stringHandler;
TagPrivate::stringHandler = handler;
}
////////////////////////////////////////////////////////////////////////////////
// protected methods
////////////////////////////////////////////////////////////////////////////////
void ID3v1::Tag::read()
{
if(d->file && d->file->isValid()) {
d->file->seek(d->tagOffset);
// read the tag -- always 128 bytes
ByteVector data = d->file->readBlock(128);
// some initial sanity checking
if(data.size() == 128 && data.startsWith("TAG"))
parse(data);
else
debug("ID3v1 tag is not valid or could not be read at the specified offset.");
}
}
void ID3v1::Tag::parse(const ByteVector &data)
{
int offset = 3;
d->title = TagPrivate::stringHandler->parse(data.mid(offset, 30));
offset += 30;
d->artist = TagPrivate::stringHandler->parse(data.mid(offset, 30));
offset += 30;
d->album = TagPrivate::stringHandler->parse(data.mid(offset, 30));
offset += 30;
d->year = TagPrivate::stringHandler->parse(data.mid(offset, 4));
offset += 4;
// Check for ID3v1.1 -- Note that ID3v1 *does not* support "track zero" -- this
// is not a bug in TagLib. Since a zeroed byte is what we would expect to
// indicate the end of a C-String, specifically the comment string, a value of
// zero must be assumed to be just that.
if(data[offset + 28] == 0 && data[offset + 29] != 0) {
// ID3v1.1 detected
d->comment = TagPrivate::stringHandler->parse(data.mid(offset, 28));
d->track = uchar(data[offset + 29]);
}
else
d->comment = data.mid(offset, 30);
offset += 30;
d->genre = uchar(data[offset]);
}
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