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cog/Frameworks/TagLib/taglib/taglib/mpeg/id3v2/id3v2tag.cpp

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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., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 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 <algorithm>
#include <tfile.h>
#include <tbytevector.h>
#include <tpropertymap.h>
#include <tdebug.h>
#include "id3v2tag.h"
#include "id3v2header.h"
#include "id3v2extendedheader.h"
#include "id3v2footer.h"
#include "id3v2synchdata.h"
#include "id3v1genres.h"
#include "frames/textidentificationframe.h"
#include "frames/commentsframe.h"
#include "frames/urllinkframe.h"
#include "frames/uniquefileidentifierframe.h"
#include "frames/unsynchronizedlyricsframe.h"
#include "frames/unknownframe.h"
using namespace TagLib;
using namespace ID3v2;
namespace
{
const ID3v2::Latin1StringHandler defaultStringHandler;
const ID3v2::Latin1StringHandler *stringHandler = &defaultStringHandler;
const long MinPaddingSize = 1024;
const long MaxPaddingSize = 1024 * 1024;
bool contains(const char **a, const ByteVector &v)
{
for(int i = 0; a[i]; i++)
{
if(v == a[i])
return true;
}
return false;
}
}
class ID3v2::Tag::TagPrivate
{
public:
TagPrivate() :
factory(0),
file(0),
tagOffset(0),
extendedHeader(0),
footer(0)
{
frameList.setAutoDelete(true);
}
~TagPrivate()
{
delete extendedHeader;
delete footer;
}
const FrameFactory *factory;
File *file;
long tagOffset;
Header header;
ExtendedHeader *extendedHeader;
Footer *footer;
FrameListMap frameListMap;
FrameList frameList;
};
////////////////////////////////////////////////////////////////////////////////
// StringHandler implementation
////////////////////////////////////////////////////////////////////////////////
Latin1StringHandler::Latin1StringHandler()
{
}
Latin1StringHandler::~Latin1StringHandler()
{
}
String Latin1StringHandler::parse(const ByteVector &data) const
{
return String(data, String::Latin1);
}
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
ID3v2::Tag::Tag() :
TagLib::Tag(),
d(new TagPrivate())
{
d->factory = FrameFactory::instance();
}
ID3v2::Tag::Tag(File *file, long tagOffset, const FrameFactory *factory) :
TagLib::Tag(),
d(new TagPrivate())
{
d->factory = factory;
d->file = file;
d->tagOffset = tagOffset;
read();
}
ID3v2::Tag::~Tag()
{
delete d;
}
String ID3v2::Tag::title() const
{
if(!d->frameListMap["TIT2"].isEmpty())
return d->frameListMap["TIT2"].front()->toString();
return String();
}
String ID3v2::Tag::artist() const
{
if(!d->frameListMap["TPE1"].isEmpty())
return d->frameListMap["TPE1"].front()->toString();
return String();
}
String ID3v2::Tag::albumartist() const
{
if(!d->frameListMap["TPE2"].isEmpty())
return d->frameListMap["TPE2"].front()->toString();
return String();
}
String ID3v2::Tag::album() const
{
if(!d->frameListMap["TALB"].isEmpty())
return d->frameListMap["TALB"].front()->toString();
return String();
}
String ID3v2::Tag::comment() const
{
const FrameList &comments = d->frameListMap["COMM"];
if(comments.isEmpty())
return String();
for(FrameList::ConstIterator it = comments.begin(); it != comments.end(); ++it)
{
CommentsFrame *frame = dynamic_cast<CommentsFrame *>(*it);
if(frame && frame->description().isEmpty())
return (*it)->toString();
}
return comments.front()->toString();
}
String ID3v2::Tag::genre() const
{
// TODO: In the next major version (TagLib 2.0) a list of multiple genres
// should be separated by " / " instead of " ". For the moment to keep
// the behavior the same as released versions it is being left with " ".
if(d->frameListMap["TCON"].isEmpty() ||
!dynamic_cast<TextIdentificationFrame *>(d->frameListMap["TCON"].front()))
{
return String();
}
// ID3v2.4 lists genres as the fields in its frames field list. If the field
// is simply a number it can be assumed that it is an ID3v1 genre number.
// Here was assume that if an ID3v1 string is present that it should be
// appended to the genre string. Multiple fields will be appended as the
// string is built.
TextIdentificationFrame *f = static_cast<TextIdentificationFrame *>(
d->frameListMap["TCON"].front());
StringList fields = f->fieldList();
StringList genres;
for(StringList::Iterator it = fields.begin(); it != fields.end(); ++it) {
if((*it).isEmpty())
continue;
bool ok;
int number = (*it).toInt(&ok);
if(ok && number >= 0 && number <= 255) {
*it = ID3v1::genre(number);
}
if(std::find(genres.begin(), genres.end(), *it) == genres.end())
genres.append(*it);
}
return genres.toString();
}
unsigned int ID3v2::Tag::year() const
{
if(!d->frameListMap["TDRC"].isEmpty())
return d->frameListMap["TDRC"].front()->toString().substr(0, 4).toInt();
return 0;
}
unsigned int ID3v2::Tag::track() const
{
if(!d->frameListMap["TRCK"].isEmpty())
return d->frameListMap["TRCK"].front()->toString().toInt();
return 0;
}
float ID3v2::Tag::rg(const String &type) const
{
const FrameList &list = d->frameListMap["TXXX"];
if (!list.isEmpty()) {
for (FrameList::ConstIterator it = list.begin(); it != list.end(); ++it) {
UserTextIdentificationFrame const* frame = static_cast<UserTextIdentificationFrame *>(*it);
if (!frame->description().isNull() && frame->description() == type) {
return frame->toString().toFloat();
}
}
}
return 0;
}
float ID3v2::Tag::rgAlbumGain() const
{
return rg("replaygain_album_gain");
}
float ID3v2::Tag::rgAlbumPeak() const
{
return rg("replaygain_album_peak");
}
float ID3v2::Tag::rgTrackGain() const
{
return rg("replaygain_track_gain");
}
float ID3v2::Tag::rgTrackPeak() const
{
return rg("replaygain_track_peak");
}
void ID3v2::Tag::setTitle(const String &s)
{
setTextFrame("TIT2", s);
}
void ID3v2::Tag::setArtist(const String &s)
{
setTextFrame("TPE1", s);
}
void ID3v2::Tag::setAlbumArtist(const String &s)
{
setTextFrame("TPE2", s);
}
void ID3v2::Tag::setAlbum(const String &s)
{
setTextFrame("TALB", s);
}
void ID3v2::Tag::setComment(const String &s)
{
if(s.isEmpty()) {
removeFrames("COMM");
return;
}
const FrameList &comments = d->frameListMap["COMM"];
if(!comments.isEmpty()) {
for(FrameList::ConstIterator it = comments.begin(); it != comments.end(); ++it) {
CommentsFrame *frame = dynamic_cast<CommentsFrame *>(*it);
if(frame && frame->description().isEmpty()) {
(*it)->setText(s);
return;
}
}
comments.front()->setText(s);
return;
}
CommentsFrame *f = new CommentsFrame(d->factory->defaultTextEncoding());
addFrame(f);
f->setText(s);
}
void ID3v2::Tag::setGenre(const String &s)
{
if(s.isEmpty()) {
removeFrames("TCON");
return;
}
// iTunes can't handle correctly encoded ID3v2.4 numerical genres. Just use
// strings until iTunes sucks less.
#ifdef NO_ITUNES_HACKS
int index = ID3v1::genreIndex(s);
if(index != 255)
setTextFrame("TCON", String::number(index));
else
setTextFrame("TCON", s);
#else
setTextFrame("TCON", s);
#endif
}
void ID3v2::Tag::setYear(unsigned int i)
{
if(i == 0) {
removeFrames("TDRC");
return;
}
setTextFrame("TDRC", String::number(i));
}
void ID3v2::Tag::setTrack(unsigned int i)
{
if(i == 0) {
removeFrames("TRCK");
return;
}
setTextFrame("TRCK", String::number(i));
}
void ID3v2::Tag::setRG(const String &type, float f, bool peak)
{
bool createdFrame = false;
UserTextIdentificationFrame * frame = NULL;
FrameList &list = d->frameListMap["TXXX"];
for (FrameList::Iterator it = list.begin(); it != list.end(); ++it) {
if (static_cast<UserTextIdentificationFrame *>(*it)->description() == type) {
frame = static_cast<UserTextIdentificationFrame*>(*it);
break;
}
}
if (f == 0) {
if (frame)
removeFrame(frame);
return;
}
if (frame == NULL) {
frame = new UserTextIdentificationFrame;
frame->setDescription(type);
createdFrame = true;
}
frame->setText(String::number(f) + (peak ? "" : " dB"));
if (createdFrame)
addFrame(frame);
}
void ID3v2::Tag::setRGAlbumGain(float f)
{
setRG("replaygain_album_gain", f, false);
}
void ID3v2::Tag::setRGAlbumPeak(float f)
{
setRG("replaygain_album_peak", f, true);
}
void ID3v2::Tag::setRGTrackGain(float f)
{
setRG("replaygain_track_gain", f, false);
}
void ID3v2::Tag::setRGTrackPeak(float f)
{
setRG("replaygain_track_peak", f, true);
}
bool ID3v2::Tag::isEmpty() const
{
return d->frameList.isEmpty();
}
Header *ID3v2::Tag::header() const
{
return &(d->header);
}
ExtendedHeader *ID3v2::Tag::extendedHeader() const
{
return d->extendedHeader;
}
Footer *ID3v2::Tag::footer() const
{
return d->footer;
}
const FrameListMap &ID3v2::Tag::frameListMap() const
{
return d->frameListMap;
}
const FrameList &ID3v2::Tag::frameList() const
{
return d->frameList;
}
const FrameList &ID3v2::Tag::frameList(const ByteVector &frameID) const
{
return d->frameListMap[frameID];
}
void ID3v2::Tag::addFrame(Frame *frame)
{
d->frameList.append(frame);
d->frameListMap[frame->frameID()].append(frame);
}
void ID3v2::Tag::removeFrame(Frame *frame, bool del)
{
// remove the frame from the frame list
FrameList::Iterator it = d->frameList.find(frame);
d->frameList.erase(it);
// ...and from the frame list map
it = d->frameListMap[frame->frameID()].find(frame);
d->frameListMap[frame->frameID()].erase(it);
// ...and delete as desired
if(del)
delete frame;
}
void ID3v2::Tag::removeFrames(const ByteVector &id)
{
FrameList l = d->frameListMap[id];
for(FrameList::ConstIterator it = l.begin(); it != l.end(); ++it)
removeFrame(*it, true);
}
PropertyMap ID3v2::Tag::properties() const
{
PropertyMap properties;
for(FrameList::ConstIterator it = frameList().begin(); it != frameList().end(); ++it) {
PropertyMap props = (*it)->asProperties();
properties.merge(props);
}
return properties;
}
void ID3v2::Tag::removeUnsupportedProperties(const StringList &properties)
{
for(StringList::ConstIterator it = properties.begin(); it != properties.end(); ++it){
if(it->startsWith("UNKNOWN/")) {
String frameID = it->substr(String("UNKNOWN/").size());
if(frameID.size() != 4)
continue; // invalid specification
ByteVector id = frameID.data(String::Latin1);
// delete all unknown frames of given type
FrameList l = frameList(id);
for(FrameList::ConstIterator fit = l.begin(); fit != l.end(); fit++)
if (dynamic_cast<const UnknownFrame *>(*fit) != 0)
removeFrame(*fit);
}
else if(it->size() == 4){
ByteVector id = it->data(String::Latin1);
removeFrames(id);
}
else {
ByteVector id = it->substr(0,4).data(String::Latin1);
if(it->size() <= 5)
continue; // invalid specification
String description = it->substr(5);
Frame *frame = 0;
if(id == "TXXX")
frame = UserTextIdentificationFrame::find(this, description);
else if(id == "WXXX")
frame = UserUrlLinkFrame::find(this, description);
else if(id == "COMM")
frame = CommentsFrame::findByDescription(this, description);
else if(id == "USLT")
frame = UnsynchronizedLyricsFrame::findByDescription(this, description);
else if(id == "UFID")
frame = UniqueFileIdentifierFrame::findByOwner(this, description);
if(frame)
removeFrame(frame);
}
}
}
PropertyMap ID3v2::Tag::setProperties(const PropertyMap &origProps)
{
FrameList framesToDelete;
// we split up the PropertyMap into the "normal" keys and the "complicated" ones,
// which are those according to TIPL or TMCL frames.
PropertyMap properties;
PropertyMap tiplProperties;
PropertyMap tmclProperties;
Frame::splitProperties(origProps, properties, tiplProperties, tmclProperties);
for(FrameListMap::ConstIterator it = frameListMap().begin(); it != frameListMap().end(); ++it){
for(FrameList::ConstIterator lit = it->second.begin(); lit != it->second.end(); ++lit){
PropertyMap frameProperties = (*lit)->asProperties();
if(it->first == "TIPL") {
if (tiplProperties != frameProperties)
framesToDelete.append(*lit);
else
tiplProperties.erase(frameProperties);
} else if(it->first == "TMCL") {
if (tmclProperties != frameProperties)
framesToDelete.append(*lit);
else
tmclProperties.erase(frameProperties);
} else if(!properties.contains(frameProperties))
framesToDelete.append(*lit);
else
properties.erase(frameProperties);
}
}
for(FrameList::ConstIterator it = framesToDelete.begin(); it != framesToDelete.end(); ++it)
removeFrame(*it);
// now create remaining frames:
// start with the involved people list (TIPL)
if(!tiplProperties.isEmpty())
addFrame(TextIdentificationFrame::createTIPLFrame(tiplProperties));
// proceed with the musician credit list (TMCL)
if(!tmclProperties.isEmpty())
addFrame(TextIdentificationFrame::createTMCLFrame(tmclProperties));
// now create the "one key per frame" frames
for(PropertyMap::ConstIterator it = properties.begin(); it != properties.end(); ++it)
addFrame(Frame::createTextualFrame(it->first, it->second));
return PropertyMap(); // ID3 implements the complete PropertyMap interface, so an empty map is returned
}
ByteVector ID3v2::Tag::render() const
{
return render(ID3v2::v4);
}
void ID3v2::Tag::downgradeFrames(FrameList *frames, FrameList *newFrames) const
{
#ifdef NO_ITUNES_HACKS
static const char *unsupportedFrames[] = {
"ASPI", "EQU2", "RVA2", "SEEK", "SIGN", "TDRL", "TDTG",
"TMOO", "TPRO", "TSOA", "TSOT", "TSST", "TSOP", 0
};
#else
// iTunes writes and reads TSOA, TSOT, TSOP to ID3v2.3.
static const char *unsupportedFrames[] = {
"ASPI", "EQU2", "RVA2", "SEEK", "SIGN", "TDRL", "TDTG",
"TMOO", "TPRO", "TSST", 0
};
#endif
ID3v2::TextIdentificationFrame *frameTDOR = 0;
ID3v2::TextIdentificationFrame *frameTDRC = 0;
ID3v2::TextIdentificationFrame *frameTIPL = 0;
ID3v2::TextIdentificationFrame *frameTMCL = 0;
ID3v2::TextIdentificationFrame *frameTCON = 0;
for(FrameList::ConstIterator it = d->frameList.begin(); it != d->frameList.end(); it++) {
ID3v2::Frame *frame = *it;
ByteVector frameID = frame->header()->frameID();
if(contains(unsupportedFrames, frameID))
{
debug("A frame that is not supported in ID3v2.3 \'" + String(frameID) +
"\' has been discarded");
continue;
}
if(frameID == "TDOR")
frameTDOR = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
else if(frameID == "TDRC")
frameTDRC = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
else if(frameID == "TIPL")
frameTIPL = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
else if(frameID == "TMCL")
frameTMCL = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
else if(frame && frameID == "TCON")
frameTCON = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
else
frames->append(frame);
}
if(frameTDOR) {
String content = frameTDOR->toString();
if(content.size() >= 4) {
ID3v2::TextIdentificationFrame *frameTORY =
new ID3v2::TextIdentificationFrame("TORY", String::Latin1);
frameTORY->setText(content.substr(0, 4));
frames->append(frameTORY);
newFrames->append(frameTORY);
}
}
if(frameTDRC) {
String content = frameTDRC->toString();
if(content.size() >= 4) {
ID3v2::TextIdentificationFrame *frameTYER =
new ID3v2::TextIdentificationFrame("TYER", String::Latin1);
frameTYER->setText(content.substr(0, 4));
frames->append(frameTYER);
newFrames->append(frameTYER);
if(content.size() >= 10 && content[4] == '-' && content[7] == '-') {
ID3v2::TextIdentificationFrame *frameTDAT =
new ID3v2::TextIdentificationFrame("TDAT", String::Latin1);
frameTDAT->setText(content.substr(8, 2) + content.substr(5, 2));
frames->append(frameTDAT);
newFrames->append(frameTDAT);
if(content.size() >= 16 && content[10] == 'T' && content[13] == ':') {
ID3v2::TextIdentificationFrame *frameTIME =
new ID3v2::TextIdentificationFrame("TIME", String::Latin1);
frameTIME->setText(content.substr(11, 2) + content.substr(14, 2));
frames->append(frameTIME);
newFrames->append(frameTIME);
}
}
}
}
if(frameTIPL || frameTMCL) {
ID3v2::TextIdentificationFrame *frameIPLS =
new ID3v2::TextIdentificationFrame("IPLS", String::Latin1);
StringList people;
if(frameTMCL) {
StringList v24People = frameTMCL->fieldList();
for(unsigned int i = 0; i + 1 < v24People.size(); i += 2) {
people.append(v24People[i]);
people.append(v24People[i+1]);
}
}
if(frameTIPL) {
StringList v24People = frameTIPL->fieldList();
for(unsigned int i = 0; i + 1 < v24People.size(); i += 2) {
people.append(v24People[i]);
people.append(v24People[i+1]);
}
}
frameIPLS->setText(people);
frames->append(frameIPLS);
newFrames->append(frameIPLS);
}
if(frameTCON) {
StringList genres = frameTCON->fieldList();
String combined;
String genreText;
const bool hasMultipleGenres = genres.size() > 1;
// If there are multiple genres, add them as multiple references to ID3v1
// genres if such a reference exists. The first genre for which no ID3v1
// genre number exists can be finally added as a refinement.
for(StringList::ConstIterator it = genres.begin(); it != genres.end(); ++it) {
bool ok = false;
int number = it->toInt(&ok);
if((ok && number >= 0 && number <= 255) || *it == "RX" || *it == "CR")
combined += '(' + *it + ')';
else if(hasMultipleGenres && (number = ID3v1::genreIndex(*it)) != 255)
combined += '(' + String::number(number) + ')';
else if(genreText.isEmpty())
genreText = *it;
}
if(!genreText.isEmpty())
combined += genreText;
frameTCON = new ID3v2::TextIdentificationFrame("TCON", String::Latin1);
frameTCON->setText(combined);
frames->append(frameTCON);
newFrames->append(frameTCON);
}
}
ByteVector ID3v2::Tag::render(int version) const
{
return render(version == 3 ? v3 : v4);
}
ByteVector ID3v2::Tag::render(Version version) const
{
// We need to render the "tag data" first so that we have to correct size to
// render in the tag's header. The "tag data" -- everything that is included
// in ID3v2::Header::tagSize() -- includes the extended header, frames and
// padding, but does not include the tag's header or footer.
// TODO: Render the extended header.
// Downgrade the frames that ID3v2.3 doesn't support.
FrameList newFrames;
newFrames.setAutoDelete(true);
FrameList frameList;
if(version == v4) {
frameList = d->frameList;
}
else {
downgradeFrames(&frameList, &newFrames);
}
// Reserve a 10-byte blank space for an ID3v2 tag header.
ByteVector tagData(Header::size(), '\0');
// Loop through the frames rendering them and adding them to the tagData.
for(FrameList::ConstIterator it = frameList.begin(); it != frameList.end(); it++) {
(*it)->header()->setVersion(version == v3 ? 3 : 4);
if((*it)->header()->frameID().size() != 4) {
debug("An ID3v2 frame of unsupported or unknown type \'"
+ String((*it)->header()->frameID()) + "\' has been discarded");
continue;
}
if(!(*it)->header()->tagAlterPreservation()) {
const ByteVector frameData = (*it)->render();
if(frameData.size() == Frame::headerSize((*it)->header()->version())) {
debug("An empty ID3v2 frame \'"
+ String((*it)->header()->frameID()) + "\' has been discarded");
continue;
}
tagData.append(frameData);
}
}
// Compute the amount of padding, and append that to tagData.
long originalSize = d->header.tagSize();
long paddingSize = originalSize - (tagData.size() - Header::size());
if(paddingSize <= 0) {
paddingSize = MinPaddingSize;
}
else {
// Padding won't increase beyond 1% of the file size or 1MB.
long threshold = d->file ? d->file->length() / 100 : 0;
threshold = std::max(threshold, MinPaddingSize);
threshold = std::min(threshold, MaxPaddingSize);
if(paddingSize > threshold)
paddingSize = MinPaddingSize;
}
tagData.resize(static_cast<unsigned int>(tagData.size() + paddingSize), '\0');
// Set the version and data size.
d->header.setMajorVersion(version);
d->header.setTagSize(tagData.size() - Header::size());
// TODO: This should eventually include d->footer->render().
const ByteVector headerData = d->header.render();
std::copy(headerData.begin(), headerData.end(), tagData.begin());
return tagData;
}
Latin1StringHandler const *ID3v2::Tag::latin1StringHandler()
{
return stringHandler;
}
void ID3v2::Tag::setLatin1StringHandler(const Latin1StringHandler *handler)
{
if(handler)
stringHandler = handler;
else
stringHandler = &defaultStringHandler;
}
////////////////////////////////////////////////////////////////////////////////
// protected members
////////////////////////////////////////////////////////////////////////////////
void ID3v2::Tag::read()
{
if(!d->file)
return;
if(!d->file->isOpen())
return;
d->file->seek(d->tagOffset);
d->header.setData(d->file->readBlock(Header::size()));
// If the tag size is 0, then this is an invalid tag (tags must contain at
// least one frame)
if(d->header.tagSize() != 0)
parse(d->file->readBlock(d->header.tagSize()));
// Look for duplicate ID3v2 tags and treat them as an extra blank of this one.
// It leads to overwriting them with zero when saving the tag.
// This is a workaround for some faulty files that have duplicate ID3v2 tags.
// Unfortunately, TagLib itself may write such duplicate tags until v1.10.
unsigned int extraSize = 0;
while(true) {
d->file->seek(d->tagOffset + d->header.completeTagSize() + extraSize);
const ByteVector data = d->file->readBlock(Header::size());
if(data.size() < Header::size() || !data.startsWith(Header::fileIdentifier()))
break;
extraSize += Header(data).completeTagSize();
}
if(extraSize != 0) {
debug("ID3v2::Tag::read() - Duplicate ID3v2 tags found.");
d->header.setTagSize(d->header.tagSize() + extraSize);
}
}
void ID3v2::Tag::parse(const ByteVector &origData)
{
ByteVector data = origData;
if(d->header.unsynchronisation() && d->header.majorVersion() <= 3)
data = SynchData::decode(data);
unsigned int frameDataPosition = 0;
unsigned int frameDataLength = data.size();
// check for extended header
if(d->header.extendedHeader()) {
if(!d->extendedHeader)
d->extendedHeader = new ExtendedHeader();
d->extendedHeader->setData(data);
if(d->extendedHeader->size() <= data.size()) {
frameDataPosition += d->extendedHeader->size();
frameDataLength -= d->extendedHeader->size();
}
}
// check for footer -- we don't actually need to parse it, as it *must*
// contain the same data as the header, but we do need to account for its
// size.
if(d->header.footerPresent() && Footer::size() <= frameDataLength)
frameDataLength -= Footer::size();
// parse frames
// Make sure that there is at least enough room in the remaining frame data for
// a frame header.
while(frameDataPosition < frameDataLength - Frame::headerSize(d->header.majorVersion())) {
// If the next data is position is 0, assume that we've hit the padding
// portion of the frame data.
if(data.at(frameDataPosition) == 0) {
if(d->header.footerPresent()) {
debug("Padding *and* a footer found. This is not allowed by the spec.");
}
break;
}
Frame *frame = d->factory->createFrame(data.mid(frameDataPosition),
&d->header);
if(!frame)
return;
// Checks to make sure that frame parsed correctly.
if(frame->size() <= 0) {
delete frame;
return;
}
frameDataPosition += frame->size() + Frame::headerSize(d->header.majorVersion());
addFrame(frame);
}
d->factory->rebuildAggregateFrames(this);
}
void ID3v2::Tag::setTextFrame(const ByteVector &id, const String &value)
{
if(value.isEmpty()) {
removeFrames(id);
return;
}
if(!d->frameListMap[id].isEmpty())
d->frameListMap[id].front()->setText(value);
else {
const String::Type encoding = d->factory->defaultTextEncoding();
TextIdentificationFrame *f = new TextIdentificationFrame(id, encoding);
addFrame(f);
f->setText(value);
}
}
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