ebml_master_cptr
kax_analyzer_c::read_all(const EbmlCallbacks &callbacks) {
reopen_file();
ebml_master_cptr master;
EbmlStream es(*m_file);
size_t i;
for (i = 0; m_data.size() > i; ++i) {
kax_analyzer_data_c &data = *m_data[i].get();
if (EBML_INFO_ID(callbacks) != data.m_id)
continue;
m_file->setFilePointer(data.m_pos);
int upper_lvl_el = 0;
EbmlElement *element = es.FindNextElement(EBML_CLASS_CONTEXT(KaxSegment), upper_lvl_el, 0xFFFFFFFFL, true);
if (!element)
continue;
if (EbmlId(*element) != EBML_INFO_ID(callbacks)) {
delete element;
continue;
}
EbmlElement *l2 = nullptr;
element->Read(*m_stream, EBML_INFO_CONTEXT(callbacks), upper_lvl_el, l2, true);
if (!master)
master = ebml_master_cptr(static_cast<EbmlMaster *>(element));
else {
EbmlMaster *src = static_cast<EbmlMaster *>(element);
while (src->ListSize() > 0) {
master->PushElement(*(*src)[0]);
src->Remove(0);
}
delete element;
}
}
if (master && (master->ListSize() == 0))
master.reset();
return master;
}
/*!
\brief Method to help reading a Master element and all subsequent children quickly
\todo add an option to discard even unknown elements
\todo handle when a mandatory element is not found
*/
void EbmlMaster::Read(EbmlStream & inDataStream, const EbmlSemanticContext & sContext, int & UpperEltFound, EbmlElement * & FoundElt, bool AllowDummyElt, ScopeMode ReadFully)
{
if (ReadFully != SCOPE_NO_DATA)
{
EbmlElement * ElementLevelA;
// remove all existing elements, including the mandatory ones...
size_t Index;
for (Index=0; Index<ElementList.size(); Index++) {
if (!(*ElementList[Index]).IsLocked()) {
delete ElementList[Index];
}
}
ElementList.clear();
uint64 MaxSizeToRead;
if (IsFiniteSize())
MaxSizeToRead = GetSize();
else
MaxSizeToRead = 0x7FFFFFFF;
// read blocks and discard the ones we don't care about
if (MaxSizeToRead > 0)
{
inDataStream.I_O().setFilePointer(GetSizePosition() + GetSizeLength(), seek_beginning);
ElementLevelA = inDataStream.FindNextElement(sContext, UpperEltFound, MaxSizeToRead, AllowDummyElt);
while (ElementLevelA != NULL && UpperEltFound <= 0 && MaxSizeToRead > 0) {
if (IsFiniteSize())
MaxSizeToRead = GetEndPosition() - ElementLevelA->GetEndPosition(); // even if it's the default value
if (!AllowDummyElt && ElementLevelA->IsDummy()) {
ElementLevelA->SkipData(inDataStream, sContext);
delete ElementLevelA; // forget this unknown element
} else {
// more logical to do it afterward
ElementList.push_back(ElementLevelA);
ElementLevelA->Read(inDataStream, EBML_CONTEXT(ElementLevelA), UpperEltFound, FoundElt, AllowDummyElt, ReadFully);
// just in case
ElementLevelA->SkipData(inDataStream, EBML_CONTEXT(ElementLevelA));
}
if (UpperEltFound > 0) {
UpperEltFound--;
if (UpperEltFound > 0 || MaxSizeToRead <= 0)
goto processCrc;
ElementLevelA = FoundElt;
continue;
}
if (UpperEltFound < 0) {
UpperEltFound++;
if (UpperEltFound < 0)
goto processCrc;
}
if (MaxSizeToRead <= 0)
goto processCrc;// this level is finished
ElementLevelA = inDataStream.FindNextElement(sContext, UpperEltFound, MaxSizeToRead, AllowDummyElt);
}
if (UpperEltFound > 0) {
FoundElt = ElementLevelA;
}
}
processCrc:
EBML_MASTER_ITERATOR Itr, CrcItr;
for (Itr = ElementList.begin(); Itr != ElementList.end();) {
if ((EbmlId)(*(*Itr)) == EBML_ID(EbmlCrc32)) {
bChecksumUsed = true;
// remove the element
Checksum = *(static_cast<EbmlCrc32*>(*Itr));
CrcItr = Itr;
break;
}
++Itr;
}
if (bChecksumUsed)
{
delete *CrcItr;
Remove(CrcItr);
}
SetValueIsSet();
}
}