DisassemblyState ReadInstruction(FileReader reader)
{
Assert.IsNotNull(reader, nameof(reader));
var opcode = reader.ReadByte();
var instructiondefinition = InstructionDefinitionMap[opcode];
var instruction = new Instruction(instructiondefinition);
var state = new DisassemblyState(reader, instruction, ReadExpression, ReadInstruction, ReadInstructionBlock);
var builderfunction = instructiondefinition.DisassemblyFunction;
builderfunction(state);
return(state);
}
Expression ReadExpression(DisassemblyState state)
{
Assert.IsNotNull(state, nameof(state));
var expression = new Expression();
while (true)
{
var operationtype = (OperationType)state.Reader.ReadByte();
var operation = new Operation(operationtype);
expression.Operations.Add(operation);
if (operationtype == OperationType.PUSH_LONG)
{
operation.Operands.Add(state.ReadOperand(OperandType.UInt32));
}
else if (operationtype == OperationType.EXEC_OP)
{
operation.Operands.Add(state.ReadOperand(OperandType.Instruction));
}
else if (operationtype == OperationType.TEST_SCENA_FLAGS || operationtype == OperationType.GET_RESULT)
{
operation.Operands.Add(state.ReadOperand(OperandType.UInt16));
}
else if (operationtype == OperationType.PUSH_VALUE_INDEX || operationtype == OperationType.UNKNOWN_23)
{
operation.Operands.Add(state.ReadOperand(OperandType.Byte));
}
else if (operationtype == OperationType.GET_CHR_WORK)
{
operation.Operands.Add(state.ReadOperand(OperandType.UInt16));
operation.Operands.Add(state.ReadOperand(OperandType.Byte));
}
else if (operationtype == OperationType.END)
{
break;
}
}
return(expression);
}