sntp.cpp

简单网络时间协议实现的源代码

/*
Module : SNTP.CPP
Purpose: implementation for a MFC class to encapsulate the SNTP protocol
Created: PJN / 05-08-1998
History: PJN / 16-11-1998 1. m_nOriginateTime was getting set incorrectly in the SNTP response
                          2. GetLastError now works when a timeout occurs.
         PJN / 25-06-2000 1. Fixed an issue where the packing order of the NtpBasicInfo
                          struct was causing problems. Now packing is set to 1 byte for this
                          struct
		     AR  / 22-07-2000 Windows CE 2.11 compatibility
         PJN / 29-03-2001 1. Updated copyright message
                          2. Fixed a handle leak RevertSetTimePriviledge where the process
                          token was not been closed
         PJN / 13-03-2003 1. Fixed a bug in CNtpSocket::IsReadible in the setup of the timeval
                          structure. Thanks to "InBloom Support" for reporting this.
         PJN / 20-09-2003 1. Class now uses CWSocket class to provide sockets capability. This
                          now allows the class to support connecting via a Socks 5 proxy.


Copyright (c) 1998 - 2003 by PJ Naughter.  (Web: www.naughter.com, Email: [e-mail])

All rights reserved.

Copyright / Usage Details:

You are allowed to include the source code in any product (commercial, shareware, freeware or otherwise) 
when your product is released in binary form. You are allowed to modify the source code in any way you want 
except you cannot modify the copyright details at the top of each module. If you want to distribute source 
code with your application, then you are only allowed to distribute versions released by the author. This is 
to maintain a single distribution point for the source code. 

*/

/////////////////////////////////  Includes  //////////////////////////////////
#include "stdafx.h"
#ifndef _INC_MATH
#pragma message("To avoid this message, please put math.h in your pre compiled header (normally stdafx.h)")
#include <math.h>
#endif
#include "sntp.h"
#include "SocMFC.h" //If you get a compilation error about this missing header file, then you need to download my CWSocket wrapper classes from http://www.naughter.com/w3mfc.html



/////////////////////////////////  Macros / Locals  ///////////////////////////

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

const double NTP_FRACTIONAL_TO_MS = (((double)1000.0)/0xFFFFFFFF);
const double NTP_TO_SECOND = (((double)1.0)/0xFFFFFFFF);
const long JAN_1ST_1900 = 2415021;

//Lookup table to convert from Milliseconds (hence 1000 Entries)
//to fractions of a second expressed as a DWORD
DWORD CNtpTime::m_MsToNTP[1000] = 
{
  0x00000000, 0x00418937, 0x0083126f, 0x00c49ba6, 0x010624dd, 0x0147ae14,
  0x0189374c, 0x01cac083, 0x020c49ba, 0x024dd2f2, 0x028f5c29, 0x02d0e560,
  0x03126e98, 0x0353f7cf, 0x03958106, 0x03d70a3d, 0x04189375, 0x045a1cac,
  0x049ba5e3, 0x04dd2f1b, 0x051eb852, 0x05604189, 0x05a1cac1, 0x05e353f8,
  0x0624dd2f, 0x06666666, 0x06a7ef9e, 0x06e978d5, 0x072b020c, 0x076c8b44,
  0x07ae147b, 0x07ef9db2, 0x083126e9, 0x0872b021, 0x08b43958, 0x08f5c28f,
  0x09374bc7, 0x0978d4fe, 0x09ba5e35, 0x09fbe76d, 0x0a3d70a4, 0x0a7ef9db,
  0x0ac08312, 0x0b020c4a, 0x0b439581, 0x0b851eb8, 0x0bc6a7f0, 0x0c083127,
  0x0c49ba5e, 0x0c8b4396, 0x0ccccccd, 0x0d0e5604, 0x0d4fdf3b, 0x0d916873,
  0x0dd2f1aa, 0x0e147ae1, 0x0e560419, 0x0e978d50, 0x0ed91687, 0x0f1a9fbe,
  0x0f5c28f6, 0x0f9db22d, 0x0fdf3b64, 0x1020c49c, 0x10624dd3, 0x10a3d70a,
  0x10e56042, 0x1126e979, 0x116872b0, 0x11a9fbe7, 0x11eb851f, 0x122d0e56,
  0x126e978d, 0x12b020c5, 0x12f1a9fc, 0x13333333, 0x1374bc6a, 0x13b645a2,
  0x13f7ced9, 0x14395810, 0x147ae148, 0x14bc6a7f, 0x14fdf3b6, 0x153f7cee,
  0x15810625, 0x15c28f5c, 0x16041893, 0x1645a1cb, 0x16872b02, 0x16c8b439,
  0x170a3d71, 0x174bc6a8, 0x178d4fdf, 0x17ced917, 0x1810624e, 0x1851eb85,
  0x189374bc, 0x18d4fdf4, 0x1916872b, 0x19581062, 0x1999999a, 0x19db22d1,
  0x1a1cac08, 0x1a5e353f, 0x1a9fbe77, 0x1ae147ae, 0x1b22d0e5, 0x1b645a1d,
  0x1ba5e354, 0x1be76c8b, 0x1c28f5c3, 0x1c6a7efa, 0x1cac0831, 0x1ced9168,
  0x1d2f1aa0, 0x1d70a3d7, 0x1db22d0e, 0x1df3b646, 0x1e353f7d, 0x1e76c8b4,
  0x1eb851ec, 0x1ef9db23, 0x1f3b645a, 0x1f7ced91, 0x1fbe76c9, 0x20000000,
  0x20418937, 0x2083126f, 0x20c49ba6, 0x210624dd, 0x2147ae14, 0x2189374c,
  0x21cac083, 0x220c49ba, 0x224dd2f2, 0x228f5c29, 0x22d0e560, 0x23126e98,
  0x2353f7cf, 0x23958106, 0x23d70a3d, 0x24189375, 0x245a1cac, 0x249ba5e3,
  0x24dd2f1b, 0x251eb852, 0x25604189, 0x25a1cac1, 0x25e353f8, 0x2624dd2f,
  0x26666666, 0x26a7ef9e, 0x26e978d5, 0x272b020c, 0x276c8b44, 0x27ae147b,
  0x27ef9db2, 0x283126e9, 0x2872b021, 0x28b43958, 0x28f5c28f, 0x29374bc7,
  0x2978d4fe, 0x29ba5e35, 0x29fbe76d, 0x2a3d70a4, 0x2a7ef9db, 0x2ac08312,
  0x2b020c4a, 0x2b439581, 0x2b851eb8, 0x2bc6a7f0, 0x2c083127, 0x2c49ba5e,
  0x2c8b4396, 0x2ccccccd, 0x2d0e5604, 0x2d4fdf3b, 0x2d916873, 0x2dd2f1aa,
  0x2e147ae1, 0x2e560419, 0x2e978d50, 0x2ed91687, 0x2f1a9fbe, 0x2f5c28f6,
  0x2f9db22d, 0x2fdf3b64, 0x3020c49c, 0x30624dd3, 0x30a3d70a, 0x30e56042,
  0x3126e979, 0x316872b0, 0x31a9fbe7, 0x31eb851f, 0x322d0e56, 0x326e978d,
  0x32b020c5, 0x32f1a9fc, 0x33333333, 0x3374bc6a, 0x33b645a2, 0x33f7ced9,
  0x34395810, 0x347ae148, 0x34bc6a7f, 0x34fdf3b6, 0x353f7cee, 0x35810625,
  0x35c28f5c, 0x36041893, 0x3645a1cb, 0x36872b02, 0x36c8b439, 0x370a3d71,
  0x374bc6a8, 0x378d4fdf, 0x37ced917, 0x3810624e, 0x3851eb85, 0x389374bc,
  0x38d4fdf4, 0x3916872b, 0x39581062, 0x3999999a, 0x39db22d1, 0x3a1cac08,
  0x3a5e353f, 0x3a9fbe77, 0x3ae147ae, 0x3b22d0e5, 0x3b645a1d, 0x3ba5e354,
  0x3be76c8b, 0x3c28f5c3, 0x3c6a7efa, 0x3cac0831, 0x3ced9168, 0x3d2f1aa0,
  0x3d70a3d7, 0x3db22d0e, 0x3df3b646, 0x3e353f7d, 0x3e76c8b4, 0x3eb851ec,
  0x3ef9db23, 0x3f3b645a, 0x3f7ced91, 0x3fbe76c9, 0x40000000, 0x40418937,
  0x4083126f, 0x40c49ba6, 0x410624dd, 0x4147ae14, 0x4189374c, 0x41cac083,
  0x420c49ba, 0x424dd2f2, 0x428f5c29, 0x42d0e560, 0x43126e98, 0x4353f7cf,
  0x43958106, 0x43d70a3d, 0x44189375, 0x445a1cac, 0x449ba5e3, 0x44dd2f1b,
  0x451eb852, 0x45604189, 0x45a1cac1, 0x45e353f8, 0x4624dd2f, 0x46666666,
  0x46a7ef9e, 0x46e978d5, 0x472b020c, 0x476c8b44, 0x47ae147b, 0x47ef9db2,
  0x483126e9, 0x4872b021, 0x48b43958, 0x48f5c28f, 0x49374bc7, 0x4978d4fe,
  0x49ba5e35, 0x49fbe76d, 0x4a3d70a4, 0x4a7ef9db, 0x4ac08312, 0x4b020c4a,
  0x4b439581, 0x4b851eb8, 0x4bc6a7f0, 0x4c083127, 0x4c49ba5e, 0x4c8b4396,
  0x4ccccccd, 0x4d0e5604, 0x4d4fdf3b, 0x4d916873, 0x4dd2f1aa, 0x4e147ae1,
  0x4e560419, 0x4e978d50, 0x4ed91687, 0x4f1a9fbe, 0x4f5c28f6, 0x4f9db22d,
  0x4fdf3b64, 0x5020c49c, 0x50624dd3, 0x50a3d70a, 0x50e56042, 0x5126e979,
  0x516872b0, 0x51a9fbe7, 0x51eb851f, 0x522d0e56, 0x526e978d, 0x52b020c5,
  0x52f1a9fc, 0x53333333, 0x5374bc6a, 0x53b645a2, 0x53f7ced9, 0x54395810,
  0x547ae148, 0x54bc6a7f, 0x54fdf3b6, 0x553f7cee, 0x55810625, 0x55c28f5c,
  0x56041893, 0x5645a1cb, 0x56872b02, 0x56c8b439, 0x570a3d71, 0x574bc6a8,
  0x578d4fdf, 0x57ced917, 0x5810624e, 0x5851eb85, 0x589374bc, 0x58d4fdf4,
  0x5916872b, 0x59581062, 0x5999999a, 0x59db22d1, 0x5a1cac08, 0x5a5e353f,
  0x5a9fbe77, 0x5ae147ae, 0x5b22d0e5, 0x5b645a1d, 0x5ba5e354, 0x5be76c8b,
  0x5c28f5c3, 0x5c6a7efa, 0x5cac0831, 0x5ced9168, 0x5d2f1aa0, 0x5d70a3d7,
  0x5db22d0e, 0x5df3b646, 0x5e353f7d, 0x5e76c8b4, 0x5eb851ec, 0x5ef9db23,
  0x5f3b645a, 0x5f7ced91, 0x5fbe76c9, 0x60000000, 0x60418937, 0x6083126f,
  0x60c49ba6, 0x610624dd, 0x6147ae14, 0x6189374c, 0x61cac083, 0x620c49ba,
  0x624dd2f2, 0x628f5c29, 0x62d0e560, 0x63126e98, 0x6353f7cf, 0x63958106,
  0x63d70a3d, 0x64189375, 0x645a1cac, 0x649ba5e3, 0x64dd2f1b, 0x651eb852,
  0x65604189, 0x65a1cac1, 0x65e353f8, 0x6624dd2f, 0x66666666, 0x66a7ef9e,
  0x66e978d5, 0x672b020c, 0x676c8b44, 0x67ae147b, 0x67ef9db2, 0x683126e9,
  0x6872b021, 0x68b43958, 0x68f5c28f, 0x69374bc7, 0x6978d4fe, 0x69ba5e35,
  0x69fbe76d, 0x6a3d70a4, 0x6a7ef9db, 0x6ac08312, 0x6b020c4a, 0x6b439581,
  0x6b851eb8, 0x6bc6a7f0, 0x6c083127, 0x6c49ba5e, 0x6c8b4396, 0x6ccccccd,
  0x6d0e5604, 0x6d4fdf3b, 0x6d916873, 0x6dd2f1aa, 0x6e147ae1, 0x6e560419,
  0x6e978d50, 0x6ed91687, 0x6f1a9fbe, 0x6f5c28f6, 0x6f9db22d, 0x6fdf3b64,
  0x7020c49c, 0x70624dd3, 0x70a3d70a, 0x70e56042, 0x7126e979, 0x716872b0,
  0x71a9fbe7, 0x71eb851f, 0x722d0e56, 0x726e978d, 0x72b020c5, 0x72f1a9fc,
  0x73333333, 0x7374bc6a, 0x73b645a2, 0x73f7ced9, 0x74395810, 0x747ae148,
  0x74bc6a7f, 0x74fdf3b6, 0x753f7cee, 0x75810625, 0x75c28f5c, 0x76041893,
  0x7645a1cb, 0x76872b02, 0x76c8b439, 0x770a3d71, 0x774bc6a8, 0x778d4fdf,
  0x77ced917, 0x7810624e, 0x7851eb85, 0x789374bc, 0x78d4fdf4, 0x7916872b,
  0x79581062, 0x7999999a, 0x79db22d1, 0x7a1cac08, 0x7a5e353f, 0x7a9fbe77,
  0x7ae147ae, 0x7b22d0e5, 0x7b645a1d, 0x7ba5e354, 0x7be76c8b, 0x7c28f5c3,
  0x7c6a7efa, 0x7cac0831, 0x7ced9168, 0x7d2f1aa0, 0x7d70a3d7, 0x7db22d0e,
  0x7df3b646, 0x7e353f7d, 0x7e76c8b4, 0x7eb851ec, 0x7ef9db23, 0x7f3b645a,
  0x7f7ced91, 0x7fbe76c9, 0x80000000, 0x80418937, 0x8083126f, 0x80c49ba6,
  0x810624dd, 0x8147ae14, 0x8189374c, 0x81cac083, 0x820c49ba, 0x824dd2f2,
  0x828f5c29, 0x82d0e560, 0x83126e98, 0x8353f7cf, 0x83958106, 0x83d70a3d,
  0x84189375, 0x845a1cac, 0x849ba5e3, 0x84dd2f1b, 0x851eb852, 0x85604189,
  0x85a1cac1, 0x85e353f8, 0x8624dd2f, 0x86666666, 0x86a7ef9e, 0x86e978d5,
  0x872b020c, 0x876c8b44, 0x87ae147b, 0x87ef9db2, 0x883126e9, 0x8872b021,
  0x88b43958, 0x88f5c28f, 0x89374bc7, 0x8978d4fe, 0x89ba5e35, 0x89fbe76d,
  0x8a3d70a4, 0x8a7ef9db, 0x8ac08312, 0x8b020c4a, 0x8b439581, 0x8b851eb8,
  0x8bc6a7f0, 0x8c083127, 0x8c49ba5e, 0x8c8b4396, 0x8ccccccd, 0x8d0e5604,
  0x8d4fdf3b, 0x8d916873, 0x8dd2f1aa, 0x8e147ae1, 0x8e560419, 0x8e978d50,
  0x8ed91687, 0x8f1a9fbe, 0x8f5c28f6, 0x8f9db22d, 0x8fdf3b64, 0x9020c49c,
  0x90624dd3, 0x90a3d70a, 0x90e56042, 0x9126e979, 0x916872b0, 0x91a9fbe7,
  0x91eb851f, 0x922d0e56, 0x926e978d, 0x92b020c5, 0x92f1a9fc, 0x93333333,
  0x9374bc6a, 0x93b645a2, 0x93f7ced9, 0x94395810, 0x947ae148, 0x94bc6a7f,
  0x94fdf3b6, 0x953f7cee, 0x95810625, 0x95c28f5c, 0x96041893, 0x9645a1cb,
  0x96872b02, 0x96c8b439, 0x970a3d71, 0x974bc6a8, 0x978d4fdf, 0x97ced917,
  0x9810624e, 0x9851eb85, 0x989374bc, 0x98d4fdf4, 0x9916872b, 0x99581062,
  0x9999999a, 0x99db22d1, 0x9a1cac08, 0x9a5e353f, 0x9a9fbe77, 0x9ae147ae,
  0x9b22d0e5, 0x9b645a1d, 0x9ba5e354, 0x9be76c8b, 0x9c28f5c3, 0x9c6a7efa,
  0x9cac0831, 0x9ced9168, 0x9d2f1aa0, 0x9d70a3d7, 0x9db22d0e, 0x9df3b646,
  0x9e353f7d, 0x9e76c8b4, 0x9eb851ec, 0x9ef9db23, 0x9f3b645a, 0x9f7ced91,
  0x9fbe76c9, 0xa0000000, 0xa0418937, 0xa083126f, 0xa0c49ba6, 0xa10624dd,
  0xa147ae14, 0xa189374c, 0xa1cac083, 0xa20c49ba, 0xa24dd2f2, 0xa28f5c29,
  0xa2d0e560, 0xa3126e98, 0xa353f7cf, 0xa3958106, 0xa3d70a3d, 0xa4189375,
  0xa45a1cac, 0xa49ba5e3, 0xa4dd2f1b, 0xa51eb852, 0xa5604189, 0xa5a1cac1,
  0xa5e353f8, 0xa624dd2f, 0xa6666666, 0xa6a7ef9e, 0xa6e978d5, 0xa72b020c,
  0xa76c8b44, 0xa7ae147b, 0xa7ef9db2, 0xa83126e9, 0xa872b021, 0xa8b43958,
  0xa8f5c28f, 0xa9374bc7, 0xa978d4fe, 0xa9ba5e35, 0xa9fbe76d, 0xaa3d70a4,
  0xaa7ef9db, 0xaac08312, 0xab020c4a, 0xab439581, 0xab851eb8, 0xabc6a7f0,
  0xac083127, 0xac49ba5e, 0xac8b4396, 0xaccccccd, 0xad0e5604, 0xad4fdf3b,
  0xad916873, 0xadd2f1aa, 0xae147ae1, 0xae560419, 0xae978d50, 0xaed91687,
  0xaf1a9fbe, 0xaf5c28f6, 0xaf9db22d, 0xafdf3b64, 0xb020c49c, 0xb0624dd3,
  0xb0a3d70a, 0xb0e56042, 0xb126e979, 0xb16872b0, 0xb1a9fbe7, 0xb1eb851f,
  0xb22d0e56, 0xb26e978d, 0xb2b020c5, 0xb2f1a9fc, 0xb3333333, 0xb374bc6a,
  0xb3b645a2, 0xb3f7ced9, 0xb4395810, 0xb47ae148, 0xb4bc6a7f, 0xb4fdf3b6,
  0xb53f7cee, 0xb5810625, 0xb5c28f5c, 0xb6041893, 0xb645a1cb, 0xb6872b02,
  0xb6c8b439, 0xb70a3d71, 0xb74bc6a8, 0xb78d4fdf, 0xb7ced917, 0xb810624e,
  0xb851eb85, 0xb89374bc, 0xb8d4fdf4, 0xb916872b, 0xb9581062, 0xb999999a,
  0xb9db22d1, 0xba1cac08, 0xba5e353f, 0xba9fbe77, 0xbae147ae, 0xbb22d0e5,
  0xbb645a1d, 0xbba5e354, 0xbbe76c8b, 0xbc28f5c3, 0xbc6a7efa, 0xbcac0831,
  0xbced9168, 0xbd2f1aa0, 0xbd70a3d7, 0xbdb22d0e, 0xbdf3b646, 0xbe353f7d,
  0xbe76c8b4, 0xbeb851ec, 0xbef9db23, 0xbf3b645a, 0xbf7ced91, 0xbfbe76c9,
  0xc0000000, 0xc0418937, 0xc083126f, 0xc0c49ba6, 0xc10624dd, 0xc147ae14,
  0xc189374c, 0xc1cac083, 0xc20c49ba, 0xc24dd2f2, 0xc28f5c29, 0xc2d0e560,
  0xc3126e98, 0xc353f7cf, 0xc3958106, 0xc3d70a3d, 0xc4189375, 0xc45a1cac,
  0xc49ba5e3, 0xc4dd2f1b, 0xc51eb852, 0xc5604189, 0xc5a1cac1, 0xc5e353f8,
  0xc624dd2f, 0xc6666666, 0xc6a7ef9e, 0xc6e978d5, 0xc72b020c, 0xc76c8b44,
  0xc7ae147b, 0xc7ef9db2, 0xc83126e9, 0xc872b021, 0xc8b43958, 0xc8f5c28f,
  0xc9374bc7, 0xc978d4fe, 0xc9ba5e35, 0xc9fbe76d, 0xca3d70a4, 0xca7ef9db,
  0xcac08312, 0xcb020c4a, 0xcb439581, 0xcb851eb8, 0xcbc6a7f0, 0xcc083127,
  0xcc49ba5e, 0xcc8b4396, 0xcccccccd, 0xcd0e5604, 0xcd4fdf3b, 0xcd916873,
  0xcdd2f1aa, 0xce147ae1, 0xce560419, 0xce978d50, 0xced91687, 0xcf1a9fbe,
  0xcf5c28f6, 0xcf9db22d, 0xcfdf3b64, 0xd020c49c, 0xd0624dd3, 0xd0a3d70a,
  0xd0e56042, 0xd126e979, 0xd16872b0, 0xd1a9fbe7, 0xd1eb851f, 0xd22d0e56,
  0xd26e978d, 0xd2b020c5, 0xd2f1a9fc, 0xd3333333, 0xd374bc6a, 0xd3b645a2,
  0xd3f7ced9, 0xd4395810, 0xd47ae148, 0xd4bc6a7f, 0xd4fdf3b6, 0xd53f7cee,
  0xd5810625, 0xd5c28f5c, 0xd6041893, 0xd645a1cb, 0xd6872b02, 0xd6c8b439,
  0xd70a3d71, 0xd74bc6a8, 0xd78d4fdf, 0xd7ced917, 0xd810624e, 0xd851eb85,
  0xd89374bc, 0xd8d4fdf4, 0xd916872b, 0xd9581062, 0xd999999a, 0xd9db22d1,
  0xda1cac08, 0xda5e353f, 0xda9fbe77, 0xdae147ae, 0xdb22d0e5, 0xdb645a1d,
  0xdba5e354, 0xdbe76c8b, 0xdc28f5c3, 0xdc6a7efa, 0xdcac0831, 0xdced9168,
  0xdd2f1aa0, 0xdd70a3d7, 0xddb22d0e, 0xddf3b646, 0xde353f7d, 0xde76c8b4,
  0xdeb851ec, 0xdef9db23, 0xdf3b645a, 0xdf7ced91, 0xdfbe76c9, 0xe0000000,
  0xe0418937, 0xe083126f, 0xe0c49ba6, 0xe10624dd, 0xe147ae14, 0xe189374c,
  0xe1cac083, 0xe20c49ba, 0xe24dd2f2, 0xe28f5c29, 0xe2d0e560, 0xe3126e98,
  0xe353f7cf, 0xe3958106, 0xe3d70a3d, 0xe4189375, 0xe45a1cac, 0xe49ba5e3,
  0xe4dd2f1b, 0xe51eb852, 0xe5604189, 0xe5a1cac1, 0xe5e353f8, 0xe624dd2f,
  0xe6666666, 0xe6a7ef9e, 0xe6e978d5, 0xe72b020c, 0xe76c8b44, 0xe7ae147b,
  0xe7ef9db2, 0xe83126e9, 0xe872b021, 0xe8b43958, 0xe8f5c28f, 0xe9374bc7,
  0xe978d4fe, 0xe9ba5e35, 0xe9fbe76d, 0xea3d70a4, 0xea7ef9db, 0xeac08312,
  0xeb020c4a, 0xeb439581, 0xeb851eb8, 0xebc6a7f0, 0xec083127, 0xec49ba5e,
  0xec8b4396, 0xeccccccd, 0xed0e5604, 0xed4fdf3b, 0xed916873, 0xedd2f1aa,
  0xee147ae1, 0xee560419, 0xee978d50, 0xeed91687, 0xef1a9fbe, 0xef5c28f6,
  0xef9db22d, 0xefdf3b64, 0xf020c49c, 0xf0624dd3, 0xf0a3d70a, 0xf0e56042,
  0xf126e979, 0xf16872b0, 0xf1a9fbe7, 0xf1eb851f, 0xf22d0e56, 0xf26e978d,
  0xf2b020c5, 0xf2f1a9fc, 0xf3333333, 0xf374bc6a, 0xf3b645a2, 0xf3f7ced9,
  0xf4395810, 0xf47ae148, 0xf4bc6a7f, 0xf4fdf3b6, 0xf53f7cee, 0xf5810625,
  0xf5c28f5c, 0xf6041893, 0xf645a1cb, 0xf6872b02, 0xf6c8b439, 0xf70a3d71,
  0xf74bc6a8, 0xf78d4fdf, 0xf7ced917, 0xf810624e, 0xf851eb85, 0xf89374bc,
  0xf8d4fdf4, 0xf916872b, 0xf9581062, 0xf999999a, 0xf9db22d1, 0xfa1cac08,
  0xfa5e353f, 0xfa9fbe77, 0xfae147ae, 0xfb22d0e5, 0xfb645a1d, 0xfba5e354,
  0xfbe76c8b, 0xfc28f5c3, 0xfc6a7efa, 0xfcac0831, 0xfced9168, 0xfd2f1aa0,
  0xfd70a3d7, 0xfdb22d0e, 0xfdf3b646, 0xfe353f7d, 0xfe76c8b4, 0xfeb851ec,
  0xfef9db23, 0xff3b645a, 0xff7ced91, 0xffbe76c9
};


//The mandatory part of an NTP packet
#pragma pack(push, 1)
struct NtpBasicInfo
{
  BYTE m_LiVnMode;
  BYTE m_Stratum;
  char m_Poll;
  char m_Precision;
  long m_RootDelay;
  long m_RootDispersion;
  char m_ReferenceID[4];
  CNtpTimePacket m_ReferenceTimestamp;
  CNtpTimePacket m_OriginateTimestamp;
  CNtpTimePacket m_ReceiveTimestamp;
  CNtpTimePacket m_TransmitTimestamp;
};
#pragma pack(pop)

//The optional part of an NTP packet
struct NtpAuthenticationInfo
{
  unsigned long m_KeyID;
  BYTE m_MessageDigest[16];
};

//The Full NTP packet
struct NtpFullPacket
{
  NtpBasicInfo          m_Basic;
  NtpAuthenticationInfo m_Auth;
};




///////////////////////////////// Implementation //////////////////////////////

CNtpTime::CNtpTime()
{
  m_Time = 0;
}

CNtpTime::CNtpTime(const CNtpTime& time)
{
  *this = time;
}

CNtpTime::CNtpTime(CNtpTimePacket& packet)
{
  DWORD dwLow = ntohl(packet.m_dwFractional);
  DWORD dwHigh = ntohl(packet.m_dwInteger);
  m_Time = ((unsigned __int64) dwHigh) << 32;
  m_Time += dwLow;
}

CNtpTime::CNtpTime(const SYSTEMTIME& st)
{
  //Currently this function only operates correctly in 
  //the 1900 - 2036 primary epoch defined by NTP

  long JD = GetJulianDay(st.wYear, st.wMonth, st.wDay);
  JD -= JAN_1ST_1900;

  ASSERT(JD >= 0); //NTP only supports dates greater than 1900
  unsigned __int64 Seconds = JD;
  Seconds = (Seconds * 24) + st.wHour;
  Seconds = (Seconds * 60) + st.wMinute;
  Seconds = (Seconds * 60) + st.wSecond;
  ASSERT(Seconds <= 0xFFFFFFFF); //NTP Only supports up to 2036
  m_Time = (Seconds << 32) + MsToNtpFraction(st.wMilliseconds);
}

long CNtpTime::GetJulianDay(WORD Year, WORD Month, WORD Day)
{
  long y = (long) Year;
  long m = (long) Month;
  long d = (long) Day;
  if (m > 2) 
    m = m - 3;
  else 
  {
    m = m + 9;
    y = y - 1;
  }
  long c = y / 100;
  long ya = y - 100 * c;
  long j = (146097L * c) / 4 + (1461L * ya) / 4 + (153L * m + 2) / 5 + d + 1721119L;
  return j;
}

void CNtpTime::GetGregorianDate(long JD, WORD& Year, WORD& Month, WORD& Day)
{
  long j = JD - 1721119;
  long y = (4 * j - 1) / 146097;
  j = 4 * j - 1 - 146097 * y;
  long d = j / 4;
  j = (4 * d + 3) / 1461;
  d = 4 * d + 3 - 1461 * j;
  d = (d + 4) / 4;
  long m = (5 * d - 3) / 153;
  d = 5 * d - 3 - 153 * m;
  d = (d + 5) / 5;
  y = 100 * y + j;
  if (m < 10) 
    m = m + 3;
  else 
  {
    m = m - 9;
    y = y + 1;
  }

  Year = (WORD) y;
  Month = (WORD) m;
  Day = (WORD) d;
}

CNtpTime& CNtpTime::operator=(const CNtpTime& time)