Implemented NOP instruction handlers for multi-byte NOP variants

X86Disassembler/X86/Handlers/Nop/TwoByteNopHandler.cs

@@ -0,0 +1,47 @@
+namespace X86Disassembler.X86.Handlers.Nop;
+
+/// <summary>
+/// Handler for the 2-byte NOP instruction (0x66 0x90)
+/// This is a NOP with an operand size prefix
+/// </summary>
+public class TwoByteNopHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the TwoByteNopHandler 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 TwoByteNopHandler(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)
+    {
+        // Check if the opcode is 0x90 and we have a 0x66 prefix
+        return opcode == 0x90 && Decoder.HasOperandSizeOverridePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a 2-byte NOP 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 = "nop";
+        
+        // NOP has no operands, even with the operand size prefix
+        instruction.Operands = "";
+        
+        return true;
+    }
+}