private List <Instruction> DisassembleFunction(byte[] functionByteCode)
{
var instructions = new List <Instruction>();
var funcStream = new BinaryReader(new MemoryStream(functionByteCode));
while (funcStream.PeekChar() != -1)
{
var instruction = new Instruction();
var instructionData = new InstructionData();
instruction.Data = instructionData;
instruction.Index =
(int)(_bytecode.BaseStream.Position - functionByteCode.Length + funcStream.BaseStream.Position);
var opcode = _resolver.ResolveOpcodeById(funcStream.ReadByte());
instruction.Opcode = opcode;
var currentIndex = instruction.Index + 1;
switch (opcode)
{
case Opcode.OpCallBuiltin0:
case Opcode.OpCallBuiltin1:
case Opcode.OpCallBuiltin2:
case Opcode.OpCallBuiltin3:
case Opcode.OpCallBuiltin4:
case Opcode.OpCallBuiltin5:
case Opcode.OpGetBuiltinFunction:
{
var funcId = funcStream.ReadUInt16();
instructionData.AddData(funcId);
instructionData.DataString = $"function name : {_resolver.ResolveFunctionNameById(funcId)}";
}
break;
case Opcode.OpJump:
{
var offset = funcStream.ReadInt32();
instructionData.AddData(offset);
instructionData.DataString =
$"offset = 0x{offset:X}, jump to index 0x{currentIndex + 4 + offset:X}";
}
break;
case Opcode.OpJumpOnTrueExpr:
case Opcode.OpJumpOnTrue:
case Opcode.OpJumpOnFalseExpr:
case Opcode.OpJumpOnFalse:
{
var offset = funcStream.ReadInt16();
instructionData.AddData(offset);
instructionData.DataString =
$"offset = 0x{offset:X}, jump to index 0x{currentIndex + 2 + offset:X}";
}
break;
case Opcode.OpJumpback:
{
var offset = funcStream.ReadUInt16();
instructionData.AddData(offset);
instructionData.DataString =
$"offset = 0x{offset:X}, jump back to index 0x{currentIndex + 2 - offset:X}";
}
break;
case Opcode.OpCallBuiltinMethod0:
case Opcode.OpCallBuiltinMethod1:
case Opcode.OpCallBuiltinMethod2:
case Opcode.OpCallBuiltinMethod3:
case Opcode.OpCallBuiltinMethod4:
case Opcode.OpCallBuiltinMethod5:
case Opcode.OpGetBuiltinMethod:
{
var funcId = funcStream.ReadUInt16();
instructionData.AddData(funcId);
instructionData.DataString = $"method name : {_resolver.ResolveMethodNameById(funcId)}";
}
break;
case Opcode.OpWaittillmatch:
funcStream.ReadUInt16();
break;
case Opcode.OpGetUnsignedShort:
{
var value = funcStream.ReadUInt16();
instructionData.AddData(value);
instructionData.DataString = $"value : {value}";
}
break;
case Opcode.OpGetNegUnsignedShort:
{
var value = funcStream.ReadUInt16();
instructionData.AddData(value);
instructionData.DataString = $"value : {-value}";
}
break;
case Opcode.OpGetFloat:
var f = funcStream.ReadSingle();
instructionData.AddData(f);
instructionData.DataString = $"value = {f}";
break;
case Opcode.OpSwitch:
funcStream.ReadInt32();
break;
case Opcode.OpGetInteger:
var i = funcStream.ReadInt32();
instructionData.AddData(i);
instructionData.DataString = $"value = {i}";
break;
case Opcode.OpScriptLocalThreadCall:
case Opcode.OpScriptLocalMethodThreadCall:
case Opcode.OpScriptLocalMethodChildThreadCall:
case Opcode.OpScriptLocalChildThreadCall:
DisassembleLocalCall(instructionData, funcStream, currentIndex, true);
break;
case Opcode.OpScriptFarMethodThreadCall:
case Opcode.OpScriptFarChildThreadCall:
case Opcode.OpScriptFarMethodChildThreadCall:
case Opcode.OpScriptFarThreadCall:
DisassembleFarCall(instructionData, funcStream, true);
break;
//TODO
case Opcode.OpGetVector:
funcStream.ReadBytes(12);
break;
case Opcode.OpScriptLocalMethodCall:
case Opcode.OpScriptLocalFunctionCall:
case Opcode.OpScriptLocalFunctionCall2:
case Opcode.OpGetLocalFunction:
DisassembleLocalCall(instructionData, funcStream, currentIndex, false);
break;
case Opcode.OpCallBuiltinMethod:
case Opcode.OpCallBuiltin:
funcStream.ReadBytes(3);
break;
case Opcode.OpScriptFarFunctionCall2:
case Opcode.OpScriptFarFunctionCall:
case Opcode.OpGetFarFunction:
case Opcode.OpScriptFarMethodCall:
DisassembleFarCall(instructionData, funcStream, false);
break;
case Opcode.OpEndswitch:
DisassembleEndSwitch(instructionData, funcStream, currentIndex);
break;
//TODO
case Opcode.OpGetAnimation:
funcStream.ReadBytes(8);
throw new InvalidOperationException("OpGetAnimation is not supported yet");
//TODO
case Opcode.OpGetAnimTree:
_buffer.ReadTerminatedString();
funcStream.ReadByte();
break;
case Opcode.OpGetString:
case Opcode.OpGetIString:
funcStream.ReadBytes(4);
var s = _buffer.ReadTerminatedString();
instructionData.AddData(s);
instructionData.DataString = $"value = {s}";
break;
case Opcode.OpEvalSelfFieldVariable:
case Opcode.OpSetLevelFieldVariableField:
case Opcode.OpClearFieldVariable:
case Opcode.OpEvalFieldVariable:
case Opcode.OpEvalFieldVariableRef:
case Opcode.OpEvalLevelFieldVariable:
case Opcode.OpSetAnimFieldVariableField:
case Opcode.OpSetSelfFieldVariableField:
case Opcode.OpEvalAnimFieldVariableRef:
case Opcode.OpEvalLevelFieldVariableRef:
case Opcode.OpEvalAnimFieldVariable:
case Opcode.OpEvalSelfFieldVariableRef:
var fieldId = funcStream.ReadUInt16();
string fieldName;
if (fieldId <= 0x95A1)
{
fieldName = _resolver.ResolveFieldNameById(fieldId);
}
else
{
fieldId = _buffer.ReadUInt16();
fieldName = fieldId == 0
? _buffer.ReadTerminatedString()
: _resolver.ResolveFieldNameById(fieldId);
}
instructionData.AddData(fieldName);
instructionData.DataString = $"field name : {fieldName}";
break;
case Opcode.OpSetNewLocalVariableFieldCached0:
case Opcode.OpEvalNewLocalArrayRefCached0:
case Opcode.OpSafeCreateVariableFieldCached:
case Opcode.OpClearLocalVariableFieldCached:
case Opcode.OpSetLocalVariableFieldCached:
case Opcode.OpRemoveLocalVariables:
case Opcode.OpEvalLocalVariableRefCached:
case Opcode.OpEvalLocalArrayRefCached:
case Opcode.OpSafeSetVariableFieldCached:
case Opcode.OpEvalLocalVariableCached:
case Opcode.OpSafeSetWaittillVariableFieldCached:
case Opcode.OpCreateLocalVariable:
case Opcode.OpEvalLocalVariableObjectCached:
case Opcode.OpEvalLocalArrayCached:
{
int index = funcStream.ReadByte();
instructionData.AddData(index);
instructionData.DataString = $"index = {index}";
}
break;
case Opcode.OpScriptChildThreadCallPointer:
case Opcode.OpCallBuiltinMethodPointer:
case Opcode.OpCallBuiltinPointer:
case Opcode.OpScriptMethodThreadCallPointer:
case Opcode.OpScriptMethodChildThreadCallPointer:
case Opcode.OpScriptThreadCallPointer:
{
int numOfParams = funcStream.ReadByte();
instructionData.AddData(numOfParams);
instructionData.DataString = $"parameters count = {numOfParams}";
}
break;
case Opcode.OpGetByte:
{
var b = funcStream.ReadByte();
instructionData.AddData(b);
instructionData.DataString = $"value = {b}";
}
break;
case Opcode.OpGetNegByte:
{
var b = funcStream.ReadByte();
instructionData.AddData(b);
instructionData.DataString = $"value = {-b}";
}
break;
}
instructions.Add(instruction);
}
return(instructions);
}