START_LIBMATROSKA_NAMESPACE
KaxSegment::KaxSegment(EBML_EXTRA_DEF)
:EbmlMaster(EBML_CLASS_SEMCONTEXT(KaxSegment) EBML_DEF_SEP EBML_EXTRA_CALL)
{
SetSizeLength(5); // mandatory min size support (for easier updating) (2^(7*5)-2 = 32Go)
SetSizeInfinite(); // by default a segment is big and the size is unknown in advance
}
uint64 EbmlVoid::Overwrite(const EbmlElement & EltToVoid, IOCallback & output, bool ComeBackAfterward, bool bWithDefault)
{
// EltToVoid.UpdateSize(bWithDefault);
if (EltToVoid.GetElementPosition() == 0) {
// this element has never been written
return 0;
}
if (EltToVoid.GetSize() + EltToVoid.HeadSize() <2) {
// the element can't be written here !
return 0;
}
uint64 CurrentPosition = output.getFilePointer();
output.setFilePointer(EltToVoid.GetElementPosition());
// compute the size of the voided data based on the original one
SetSize(EltToVoid.GetSize() + EltToVoid.HeadSize() - 1); // 1 for the ID
SetSize(GetSize() - CodedSizeLength(GetSize(), GetSizeLength(), IsFiniteSize()));
// make sure we handle even the strange cases
//uint32 A1 = GetSize() + HeadSize();
//uint32 A2 = EltToVoid.GetSize() + EltToVoid.HeadSize();
if (GetSize() + HeadSize() != EltToVoid.GetSize() + EltToVoid.HeadSize()) {
SetSize(GetSize()-1);
SetSizeLength(CodedSizeLength(GetSize(), GetSizeLength(), IsFiniteSize()) + 1);
}
if (GetSize() != 0) {
RenderHead(output, false, bWithDefault); // the rest of the data is not rewritten
}
if (ComeBackAfterward) {
output.setFilePointer(CurrentPosition);
}
return EltToVoid.GetSize() + EltToVoid.HeadSize();
}
filepos_t EbmlMaster::WriteHead(IOCallback & output, int nSizeLength, bool bWithDefault)
{
SetSizeLength(nSizeLength);
return RenderHead(output, false, bWithDefault);
}
KaxSegment::KaxSegment()
:EbmlMaster(KaxSegment_Context)
{
SetSizeLength(5); // mandatory min size support (for easier updating) (2^(7*5)-2 = 32Go)
SetSizeInfinite(); // by default a segment is big and the size is unknown in advance
}
