Implemented individual handlers for Group1 and Group3 instructions

X86Disassembler/X86/Handlers/Group1/Group1BaseHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Group1;
+
+/// <summary>
+/// Base class for Group 1 instruction handlers (ADD, OR, ADC, SBB, AND, SUB, XOR, CMP)
+/// </summary>
+public abstract class Group1BaseHandler : InstructionHandler
+{
+    // ModR/M decoder
+    protected readonly ModRMDecoder _modRMDecoder;
+    
+    /// <summary>
+    /// Initializes a new instance of the Group1BaseHandler 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>
+    protected Group1BaseHandler(byte[] codeBuffer, InstructionDecoder decoder, int length) 
+        : base(codeBuffer, decoder, length)
+    {
+        _modRMDecoder = new ModRMDecoder(codeBuffer, decoder, length);
+    }
+    
+    /// <summary>
+    /// Gets the 32-bit register name for the given register index
+    /// </summary>
+    /// <param name="reg">The register index</param>
+    /// <returns>The register name</returns>
+    protected static string GetRegister32(byte reg)
+    {
+        string[] registerNames = { "eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi" };
+        return registerNames[reg & 0x07];
+    }
+    
+    /// <summary>
+    /// Gets the 8-bit register name for the given register index
+    /// </summary>
+    /// <param name="reg">The register index</param>
+    /// <returns>The register name</returns>
+    protected static string GetRegister8(byte reg)
+    {
+        string[] registerNames = { "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh" };
+        return registerNames[reg & 0x07];
+    }
+}