Method GetEntryReader

source/common/filesystem/source/resourcefile.cpp:665–714

//==========================================================================

FileReader FResourceFile::GetEntryReader(uint32_t entry, int readertype, int readerflags)
{
	FileReader fr;
	if (entry < NumLumps)
	{
		if (Entries[entry].Flags & RESFF_NEEDFILESTART)
		{
			SetEntryAddress(entry);
		}
		if (!(Entries[entry].Flags & RESFF_COMPRESSED))
		{
			auto buf = Reader.GetBuffer();
			// if this is backed by a memory buffer, create a new reader directly referencing it.
			if (buf != nullptr)
			{
				fr.OpenMemory(buf + Entries[entry].Position, Entries[entry].Length);
			}
			else
			{
				if (readertype == READER_SHARED && !mainThread)
					readertype = READER_NEW;
				if (readertype == READER_SHARED)
				{
					fr.OpenFilePart(Reader, Entries[entry].Position, Entries[entry].Length);
				}
				else if (readertype == READER_NEW)
				{
					fr.OpenFile(FileName, Entries[entry].Position, Entries[entry].Length);
				}
				else if (readertype == READER_CACHED)
				{
					Reader.Seek(Entries[entry].Position, FileReader::SeekSet);
					auto data = Reader.Read(Entries[entry].Length);
					fr.OpenMemoryArray(data);
				}
			}
		}
		else
		{
			FileReader fri;
			if (readertype == READER_NEW || !mainThread) fri.OpenFile(FileName, Entries[entry].Position, Entries[entry].CompressedSize);
			else fri.OpenFilePart(Reader, Entries[entry].Position, Entries[entry].CompressedSize);
			int flags = DCF_TRANSFEROWNER | DCF_EXCEPTIONS;
			if (readertype == READER_CACHED) flags |= DCF_CACHED;
			else if (readerflags & READERFLAG_SEEKABLE) flags |= DCF_SEEKABLE;
			OpenDecompressor(fr, fri, Entries[entry].Length, Entries[entry].Method, flags);
		}
	}
	return fr;
}

FileData FResourceFile::Read(uint32_t entry)
{