add misc handlers, cleanup and fixes

X86Disassembler/X86/Handlers/And/AndR16Rm16Handler.cs

@@ -0,0 +1,70 @@
+using X86Disassembler.X86.Operands;
+
+namespace X86Disassembler.X86.Handlers.And;
+
+/// <summary>
+/// Handler for AND r16, r/m16 instruction (0x23 with 0x66 prefix)
+/// </summary>
+public class AndR16Rm16Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the AndR16Rm16Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public AndR16Rm16Handler(InstructionDecoder decoder) 
+        : base(decoder)
+    {
+    }
+    
+    /// <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)
+    {
+        // AND r16, r/m16 is encoded as 0x23 with 0x66 prefix
+        if (opcode != 0x23)
+        {
+            return false;
+        }
+
+        // Only handle when the operand size prefix is present
+        return Decoder.HasOperandSizePrefix();
+    }
+    
+    /// <summary>
+    /// Decodes an AND r16, r/m16 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 instruction type
+        instruction.Type = InstructionType.And;
+
+        // Check if we can read the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // For AND r16, r/m16 (0x23 with 0x66 prefix):
+        // - The reg field of the ModR/M byte specifies the destination register
+        // - The r/m field with mod specifies the source operand (register or memory)
+        var (_, reg, _, sourceOperand) = ModRMDecoder.ReadModRM16();
+
+        // Create the destination register operand with 16-bit size
+        var destinationOperand = OperandFactory.CreateRegisterOperand(reg, 16);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            sourceOperand
+        ];
+
+        return true;
+    }
+}