// ----------------------------------------------------------------------------
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ----------------------------------------------------------------------------

//
//
//
//Virtual Circuit
//  TID
//  PID
//  FID
//
//

using System;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Singularity.Channels;
using Smb.Shared;

namespace Smb.Protocol
{
    public /*static*/ sealed class SmbProtocol
    {
		private SmbProtocol() {}
		
        public static readonly byte[] SmbSignature = { 0xff, (byte)'S', (byte)'M', (byte)'B' };
        public const int NativeFileServicePort = 445;
        public const int NbtVirtualCircuitPort = 139;
        
        		
		public const int SmbHeaderSize = 37; // 0x1d; // sizeof(SmbHeader);
		
        /// <summary>
        /// Facility code for use in NTSTATUS values.
        /// </summary>
        public const uint SmbErrorFacilityCode = 0x00980000;

        public static bool IsSuccess(SmbError error)
        {
            return ((uint)error & 0x80000000) == 0;
        }

        public static bool IsError(SmbError error)
        {
            return ((uint)error & 0x80000000) != 0;
        }

        public static SmbError ToSmbError(byte errorClass, ushort code)
        {
            switch ((SmbErrorClass)errorClass) {
                case SmbErrorClass.Success:
                    return SmbError.Success;

                case SmbErrorClass.FileServer:
                    return (SmbError)((uint)SmbNtErrorClass.FileServer | code);
                    
                case SmbErrorClass.OperatingSystem:
                    return (SmbError)((uint)SmbNtErrorClass.Dos | code);

                case SmbErrorClass.HardwareError:
                    return (SmbError)((uint)SmbNtErrorClass.Hardware | code);

                default:
                    return (SmbError)((uint)SmbNtErrorClass.Unrecognized | code);
            }
        }

        public static string! GetErrorText(byte errorClass, int code)
        {
			return GetErrorText((SmbErrorClass)errorClass, code);
        }
        
        public static string! GetErrorText(SmbErrorClass errorClass, int code)
        {
            switch (errorClass) {
                case SmbErrorClass.Success:
                    return "Success." + ((SmbSuccessMessage)code).ToString();

                case SmbErrorClass.OperatingSystem:
                    return "OperatingSystem." + ((SmbOsError)code).ToString();

                case SmbErrorClass.FileServer:
                    return "FileServer." + ((SmbFileServerError)code).ToString();

                case SmbErrorClass.Unrecognized:
                    return "Unrecognized:" + code;

                case SmbErrorClass.HardwareError:
                    return "Hardware." + ((SmbHardwareError)code).ToString();

                default:
                    return "UNKNOWN CLASS " + errorClass + " CODE " + code;
            }
        }
    }
}