@Override
	public int readOpcode(AttributeId attribId) throws DecoderException {
		findMatchingAttribute(attribId);
		int opcode = readOpcode();
		curPos.copy(startPos);
		return opcode;
	}
Close stream cached by the ingestStreamAsNeeded method.
@throws IOException for low-level problems with the stream
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/PackedDecode.java