public long readNextLong(DataConverter dc) throws IOException {
		long l = readLong(dc, currentIndex);
		currentIndex += SIZEOF_LONG;
		return l;
	}
Reads the long at the current index and then increments the current
index by <code>SIZEOF_LONG</code>.

@param dc {@link BigEndianDataConverter BE} or {@link LittleEndianDataConverter LE}
@return the long at the current index
@exception IOException if an I/O error occurs
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/BinaryReader.java