OpcodeHandleDump.cs

using (var pm = new ProcessMemory("Wow"))
{
    var clientconnection = 0x1244054;
    var off = pm.Read<uint>(clientconnection - 0x400000 + pm.BaseAddress.ToInt32());

    for (var opcode = 0; opcode < 0xFFF; opcode++)
    {
        // normal opcode check from NetClient::ProcessMessage
        if ((opcode & 0x440) != 64)
            continue;

        // hash from NetClient::ProcessMessage
        var condensed = opcode & 0x3F | ((opcode & 0x380 | (opcode >> 1) & 0x7C00) >> 1);
        var jams = pm.Read<uint>(off + condensed * 4 + 344 * 4);
        if (jams == 0)
            continue;

        var handler = jams - ((opcode | (opcode << 16)) ^ 0x62A3A31D);
        var rebase = handler - pm.BaseAddress.ToInt32() + 0x400000;
        if (rebase < 0)
            continue;

        Console.WriteLine("{0:X4} {1:X8}", opcode, rebase);
    }
}