74 lines
3.1 KiB
C#
74 lines
3.1 KiB
C#
using dnlib.DotNet.Emit;
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using NUnit.Framework;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using static UnityEngine.Networking.UnityWebRequest;
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namespace Obfuz.Emit.Functions
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{
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public class IntRotateShift : FunctionBase
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{
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public override void CreateArguments(DataNodeType type, object v, CreateExpressionOptions options, List<ConstValue> args)
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{
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switch (type)
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{
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case DataNodeType.Int32:
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{
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int value = (int)v;
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// (value >> amount) | (value << (32 - amount))
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// << amount
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// value = b31 b30 .. b0;
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int leftShiftAmount = options.random.NextInt(8, 16);
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uint op1 = (uint)value >> leftShiftAmount;
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int rightShiftAmount = 32 - leftShiftAmount;
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uint op2 = (uint)value << rightShiftAmount;
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Assert.AreEqual((uint)value, (op1 << leftShiftAmount) | (op2 >> rightShiftAmount));
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args.Add(new ConstValue(DataNodeType.Int32, (int)op1));
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args.Add(new ConstValue(DataNodeType.Int32, leftShiftAmount));
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args.Add(new ConstValue(DataNodeType.Int32, (int)op2));
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args.Add(new ConstValue(DataNodeType.Int32, rightShiftAmount));
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break;
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}
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case DataNodeType.Int64:
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{
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long value = (long)v;
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int leftShiftAmount = options.random.NextInt(16, 32);
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ulong op1 = (ulong)value >> leftShiftAmount;
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int rightShiftAmount = 64 - leftShiftAmount;
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ulong op2 = (ulong)value << rightShiftAmount;
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Assert.AreEqual((ulong)value, (op1 << leftShiftAmount) | (op2 >> rightShiftAmount));
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args.Add(new ConstValue(DataNodeType.Int64, (long)op1));
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args.Add(new ConstValue(DataNodeType.Int32, leftShiftAmount));
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args.Add(new ConstValue(DataNodeType.Int64, (long)op2));
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args.Add(new ConstValue(DataNodeType.Int32, rightShiftAmount));
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break;
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}
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default: throw new NotSupportedException($"Unsupported type {type} for IntRotateShift");
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}
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}
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public override void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output)
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{
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output.Add(Instruction.Create(OpCodes.Xor));
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}
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public override void Compile(CompileContext ctx, List<IDataNode> inputs, ConstValue result)
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{
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Assert.AreEqual(inputs.Count, 4);
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inputs[0].Compile(ctx);
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inputs[1].Compile(ctx);
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ctx.output.Add(Instruction.Create(OpCodes.Shl));
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inputs[2].Compile(ctx);
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inputs[3].Compile(ctx);
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ctx.output.Add(Instruction.Create(OpCodes.Shr_Un));
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ctx.output.Add(Instruction.Create(OpCodes.Or));
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}
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}
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}
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