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Fix handling of lowercase 'metadata_block_picture' fields in Vorbis comments.

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Also refactored some redundant code for parsing pictures.
This commit is contained in:
Tsuda Kageyu
2016-11-11 00:07:32 +09:00
parent f9a747dceb
commit b98a984b66
3 changed files with 71 additions and 69 deletions
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122
taglib/ogg/xiphcomment.cpp
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@ -447,85 +447,69 @@ void Ogg::XiphComment::parse(const ByteVector &data)
const unsigned int commentLength = data.toUInt(pos, false);
pos += 4;
ByteVector entry = data.mid(pos, commentLength);
const ByteVector entry = data.mid(pos, commentLength);
pos += commentLength;
// Don't go past data end
if(pos > data.size())
break;
// Handle Pictures separately
if(entry.startsWith("METADATA_BLOCK_PICTURE=")) {
// We need base64 encoded data including padding
if((entry.size() - 23) > 3 && ((entry.size() - 23) % 4) == 0) {
// Decode base64 picture data
ByteVector picturedata = ByteVector::fromBase64(entry.mid(23));
if(picturedata.size()) {
// Decode Flac Picture
FLAC::Picture * picture = new FLAC::Picture();
if(picture->parse(picturedata)) {
d->pictureList.append(picture);
// continue to next field
continue;
}
else {
delete picture;
debug("Failed to decode FlacPicture block");
}
}
else {
debug("Failed to decode base64 encoded data");
}
}
else {
debug("Invalid base64 encoded data");
}
}
// Handle old picture standard
if(entry.startsWith("COVERART=")) {
if((entry.size() - 9) > 3 && ((entry.size() - 9) % 4) == 0) {
// Decode base64 picture data
ByteVector picturedata = ByteVector::fromBase64(entry.mid(9));
if (picturedata.size()) {
// Assume it's some type of image file
FLAC::Picture * picture = new FLAC::Picture();
picture->setData(picturedata);
picture->setMimeType("image/");
picture->setType(FLAC::Picture::Other);
d->pictureList.append(picture);
// continue to next field
continue;
}
else {
debug("Failed to decode base64 encoded data");
}
}
else {
debug("Invalid base64 encoded data");
}
}
// Check for field separator
int sep = entry.find('=');
const int sep = entry.find('=');
if(sep < 1) {
debug("Discarding invalid comment field.");
debug("Ogg::XiphComment::parse() - Discarding a field. Separator not found.");
continue;
}
// Parse key and value
String key = String(entry.mid(0, sep), String::UTF8);
String value = String(entry.mid(sep + 1), String::UTF8);
addField(key, value, false);
// Parse the key
const String key = String(entry.mid(0, sep), String::UTF8).upper();
if(!checkKey(key)) {
debug("Ogg::XiphComment::parse() - Discarding a field. Invalid key.");
continue;
}
if(key == "METADATA_BLOCK_PICTURE" || key == "COVERART") {
// Handle Pictures separately
const ByteVector picturedata = ByteVector::fromBase64(entry.mid(sep + 1));
if(picturedata.isEmpty()) {
debug("Ogg::XiphComment::parse() - Discarding a field. Invalid base64 data");
continue;
}
if(key[0] == L'M') {
// Decode FLAC Picture
FLAC::Picture * picture = new FLAC::Picture();
if(picture->parse(picturedata)) {
d->pictureList.append(picture);
}
else {
delete picture;
debug("Ogg::XiphComment::parse() - Failed to decode FLAC Picture block");
}
}
else {
// Assume it's some type of image file
FLAC::Picture * picture = new FLAC::Picture();
picture->setData(picturedata);
picture->setMimeType("image/");
picture->setType(FLAC::Picture::Other);
d->pictureList.append(picture);
}
}
else {
// Parse the text
addField(key, String(entry.mid(sep + 1), String::UTF8), false);
}
}
}