split and move handlers

X86Disassembler/X86/Handlers/Ret/RetHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Ret;
+
+/// <summary>
+/// Handler for RET instruction (0xC3)
+/// </summary>
+public class RetHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the RetHandler class
+    /// </summary>
+    /// <param name="codeBuffer">The buffer containing the code to decode</param>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    /// <param name="length">The length of the buffer</param>
+    public RetHandler(byte[] codeBuffer, InstructionDecoder decoder, int length) 
+        : base(codeBuffer, decoder, length)
+    {
+    }
+    
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        return opcode == 0xC3;
+    }
+    
+    /// <summary>
+    /// Decodes a RET instruction
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Set the mnemonic
+        instruction.Mnemonic = "ret";
+        
+        // No operands for RET
+        instruction.Operands = string.Empty;
+        
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Ret/RetImmHandler.cs

@@ -0,0 +1,56 @@
+namespace X86Disassembler.X86.Handlers.Ret;
+
+/// <summary>
+/// Handler for RET instruction with immediate operand (0xC2)
+/// </summary>
+public class RetImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the RetImmHandler class
+    /// </summary>
+    /// <param name="codeBuffer">The buffer containing the code to decode</param>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    /// <param name="length">The length of the buffer</param>
+    public RetImmHandler(byte[] codeBuffer, InstructionDecoder decoder, int length) 
+        : base(codeBuffer, decoder, length)
+    {
+    }
+    
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        return opcode == 0xC2;
+    }
+    
+    /// <summary>
+    /// Decodes a RET instruction with immediate operand
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Set the mnemonic
+        instruction.Mnemonic = "ret";
+        
+        int position = Decoder.GetPosition();
+        
+        if (position + 2 > Length)
+        {
+            return false;
+        }
+        
+        // Read the immediate value
+        ushort imm16 = BitConverter.ToUInt16(CodeBuffer, position);
+        Decoder.SetPosition(position + 2);
+        
+        // Set the operands
+        instruction.Operands = $"0x{imm16:X4}";
+        
+        return true;
+    }
+}