public SortedMap<Long, Long> getOmapFromSource() throws CancelledException {
		int streamNum = getDebugStream(DebugType.OMAP_FROM_SOURCE);
		if (streamNum == MsfStream.NIL_STREAM_NUMBER) {
			return null;
		}
		return deserializeOMap(streamNum);
	}
Returns the OMAP_FROM_SOURCE mapping of RVA to RVA
@return the omapFromSource or null if does not exist or problem parsing
@throws CancelledException upon user cancellation
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/DebugData.java