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Scott Wheeler
287
ogg/xiphcomment.cpp
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287
ogg/xiphcomment.cpp
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/***************************************************************************
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copyright : (C) 2003 by Scott Wheeler
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email : wheeler@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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* USA *
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***************************************************************************/
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#include <tbytevector.h>
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#include <tdebug.h>
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#include <xiphcomment.h>
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using namespace TagLib;
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class Ogg::XiphComment::XiphCommentPrivate
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{
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public:
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FieldListMap fieldListMap;
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String vendorID;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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Ogg::XiphComment::XiphComment() : TagLib::Tag()
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{
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d = new XiphCommentPrivate;
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}
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Ogg::XiphComment::XiphComment(const ByteVector &data) : TagLib::Tag()
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{
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d = new XiphCommentPrivate;
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parse(data);
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}
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Ogg::XiphComment::~XiphComment()
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{
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delete d;
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}
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String Ogg::XiphComment::title() const
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{
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if(d->fieldListMap["TITLE"].isEmpty())
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return String::null;
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return d->fieldListMap["TITLE"].front();
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}
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String Ogg::XiphComment::artist() const
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{
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if(d->fieldListMap["ARTIST"].isEmpty())
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return String::null;
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return d->fieldListMap["ARTIST"].front();
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}
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String Ogg::XiphComment::album() const
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{
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if(d->fieldListMap["ALBUM"].isEmpty())
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return String::null;
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return d->fieldListMap["ALBUM"].front();
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}
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String Ogg::XiphComment::comment() const
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{
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if(d->fieldListMap["DESCRIPTION"].isEmpty())
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return String::null;
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return d->fieldListMap["DESCRIPTION"].front();
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}
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String Ogg::XiphComment::genre() const
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{
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if(d->fieldListMap["GENRE"].isEmpty())
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return String::null;
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return d->fieldListMap["GENRE"].front();
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}
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TagLib::uint Ogg::XiphComment::year() const
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{
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if(d->fieldListMap["DATE"].isEmpty())
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return 0;
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return d->fieldListMap["DATE"].front().toInt();
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}
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TagLib::uint Ogg::XiphComment::track() const
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{
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if(d->fieldListMap["TRACKNUMBER"].isEmpty())
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return 0;
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return d->fieldListMap["TRACKNUMBER"].front().toInt();
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}
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void Ogg::XiphComment::setTitle(const String &s)
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{
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addField("TITLE", s);
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}
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void Ogg::XiphComment::setArtist(const String &s)
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{
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addField("ARTIST", s);
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}
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void Ogg::XiphComment::setAlbum(const String &s)
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{
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addField("ALBUM", s);
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}
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void Ogg::XiphComment::setComment(const String &s)
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{
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addField("DESCRIPTION", s);
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}
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void Ogg::XiphComment::setGenre(const String &s)
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{
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addField("GENRE", s);
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}
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void Ogg::XiphComment::setYear(uint i)
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{
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if(i == 0)
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removeField("DATE");
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else
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addField("DATE", String::number(i));
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}
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void Ogg::XiphComment::setTrack(uint i)
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{
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if(i == 0)
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removeField("TRACKNUMBER");
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else
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addField("TRACKNUMBER", String::number(i));
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}
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bool Ogg::XiphComment::isEmpty() const
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{
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FieldListMap::ConstIterator it = d->fieldListMap.begin();
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for(; it != d->fieldListMap.end(); ++it)
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if(!(*it).second.isEmpty())
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return false;
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return true;
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}
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TagLib::uint Ogg::XiphComment::fieldCount() const
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{
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uint count = 0;
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FieldListMap::ConstIterator it = d->fieldListMap.begin();
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for(; it != d->fieldListMap.end(); ++it)
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count += (*it).second.size();
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return count;
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}
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const Ogg::FieldListMap &Ogg::XiphComment::fieldListMap() const
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{
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return d->fieldListMap;
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}
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String Ogg::XiphComment::vendorID() const
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{
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return d->vendorID;
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}
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void Ogg::XiphComment::addField(const String &key, const String &value, bool replace)
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{
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if(replace)
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removeField(key.upper());
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if(!key.isEmpty())
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d->fieldListMap[key.upper()].append(value);
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}
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void Ogg::XiphComment::removeField(const String &key, const String &value)
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{
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if(!value.isNull()) {
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StringList::Iterator it = d->fieldListMap[key].begin();
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for(; it != d->fieldListMap[key].end(); ++it) {
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if(value == *it)
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d->fieldListMap[key].erase(it);
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}
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}
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else
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d->fieldListMap[key].clear();
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}
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ByteVector Ogg::XiphComment::render() const
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{
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ByteVector data;
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// Add the vendor ID length and the vendor ID. It's important to use the
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// lenght of the data(String::UTF8) rather than the lenght of the the string
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// since this is UTF8 text and there may be more characters in the data than
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// in the UTF16 string.
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ByteVector vendorData = d->vendorID.data(String::UTF8);
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data.append(ByteVector::fromUInt(vendorData.size(), false));
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data.append(vendorData);
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// Add the number of fields.
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data.append(ByteVector::fromUInt(fieldCount(), false));
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// Iterate over the the field lists. Our iterator returns a
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// std::pair<String, StringList> where the first String is the field name and
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// the StringList is the values associated with that field.
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FieldListMap::ConstIterator it = d->fieldListMap.begin();
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for(; it != d->fieldListMap.end(); ++it) {
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// And now iterate over the values of the current list.
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String fieldName = (*it).first;
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StringList values = (*it).second;
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StringList::ConstIterator valuesIt = values.begin();
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for(; valuesIt != values.end(); ++valuesIt) {
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ByteVector fieldData = fieldName.data(String::UTF8);
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fieldData.append('=');
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fieldData.append((*valuesIt).data(String::UTF8));
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data.append(ByteVector::fromUInt(fieldData.size(), false));
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data.append(fieldData);
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}
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}
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// Append the "framing bit".
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data.append(char(1));
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return data;
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}
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////////////////////////////////////////////////////////////////////////////////
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// protected members
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////////////////////////////////////////////////////////////////////////////////
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void Ogg::XiphComment::parse(const ByteVector &data)
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{
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// The first thing in the comment data is the vendor ID length, followed by a
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// UTF8 string with the vendor ID.
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int pos = 0;
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int vendorLength = data.mid(0, 4).toUInt(false);
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pos += 4;
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d->vendorID = String(data.mid(pos, vendorLength), String::UTF8);
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pos += vendorLength;
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// Next the number of fields in the comment vector.
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int commentFields = data.mid(pos, 4).toUInt(false);
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pos += 4;
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for(int i = 0; i < commentFields; i++) {
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// Each comment field is in the format "KEY=value" in a UTF8 string and has
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// 4 bytes before the text starts that gives the length.
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int commentLength = data.mid(pos, 4).toUInt(false);
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pos += 4;
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String comment = String(data.mid(pos, commentLength), String::UTF8);
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pos += commentLength;
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int commentSeparatorPosition = comment.find("=");
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String key = comment.substr(0, commentSeparatorPosition);
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String value = comment.substr(commentSeparatorPosition + 1);
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addField(key, value, false);
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}
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}
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