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Proper handling of MP4 atoms with zero length.

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If the size of an atom is 0, it designates the last atom which extends to the end of the file.
This commit is contained in:
Tsuda Kageyu
2016-11-02 15:44:50 +09:00
parent eb6d058ab9
commit f5ca097379
3 changed files with 18 additions and 2 deletions
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10
taglib/mp4/mp4atom.cpp
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@ -54,10 +54,15 @@ MP4::Atom::Atom(File *file)
length = header.toUInt();
if(length == 1) {
if(length == 0) {
// The last atom which extends to the end of the file.
length = file->length() - offset;
}
else if(length == 1) {
// The atom has a 64-bit length.
const long long longLength = file->readBlock(8).toLongLong();
if(longLength <= LONG_MAX) {
// The atom has a 64-bit length, but it's actually a 31-bit value or long is 64-bit.
// The actual length fits in long. That's always the case if long is 64-bit.
length = static_cast<long>(longLength);
}
else {
@ -67,6 +72,7 @@ MP4::Atom::Atom(File *file)
return;
}
}
if(length < 8) {
debug("MP4: Invalid atom size");
length = 0;