Sir,
I have constructed a code by using your given references but i can’t get output screen that show me calculated crc. This is my program :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Read_textfile
{
class Program
{
static void Main(string[] args)
{
int counter = 0;
string line;
// Read the file and display it line by line.
System.IO.StreamReader file =
new System.IO.StreamReader("e:\\sample.txt");
while ((line = file.ReadLine()) != null)
{
Console.WriteLine(line);
counter++;
}
file.Close();
// Suspend the screen.
Console.ReadLine();}
public static byte[] StrToByteArray(string line)
{
Dictionary<string, byte> hexindex = new Dictionary<string, byte>();
for (int i = 0; i <= 255; i++)
hexindex.Add(i.ToString("X2"), (byte)i);
List<byte> hexres = new List<byte>();
for (int i = 0; i < line.Length; i += 2)
hexres.Add(hexindex[line.Substring(i, 2)]);
return hexres.ToArray();
}
/// <summary>Generates a 16-bit CRC-CCITT checksum.</summary>
/// <remarks>
/// This is a table based 16-bit CRC popular for modem protocols defined for use by the
/// Consultative Committee on International Telegraphy and Telephony (CCITT)
/// </remarks>
public sealed class CrcCCITT
{
#region [ Members ]
// Constants
private const ushort CrcSeed = 0xFFFF;
// Fields
private ushort crc; // The crc data checksum so far.
#endregion
#region [ Constructors ]
/// <summary>
/// Creates a new instance of the CrcCCITT class.
/// The checksum starts off with a value of 0xFFFF.
/// </summary>
public CrcCCITT()
{
Reset();
}
#endregion
#region [ Properties ]
/// <summary>
/// Returns the CRCCCITT data checksum computed so far.
/// </summary>
public ushort Value
{
get
{
return crc;
}
set
{
crc = value;
}
}
#endregion
#region [ Methods ]
/// <summary>
/// Resets the CRC-CCITT data checksum as if no update was ever called.
/// </summary>
public void Reset()
{
crc = CrcSeed;
}
/// <summary>
/// Updates the checksum with the int bval.
/// </summary>
/// <param name="value">The <see cref="byte"/> value to use for the update.</param>
public void Update(byte value)
{
crc = (ushort)((crc << 8) ^ CrcTable[((crc >> 8) ^ value) & 0xff]);
}
/// <summary>
/// Updates the checksum with the bytes taken from the array.
/// </summary>
/// <param name="buffer">buffer an array of bytes</param>
public void Update(byte[] hexres)
{
if ((object)hexres == null)
throw new ArgumentNullException("hexres");
Update(hexres, 0, hexres.Length);
}
/// <summary>
/// Adds the byte array to the data checksum.
/// </summary>
/// <param name = "buffer">The buffer which contains the data</param>
/// <param name = "offset">The offset in the buffer where the data starts</param>
/// <param name = "count">The number of data bytes to update the CRC with.</param>
public void Update(byte[] hexres, int offset, int count)
{
if ((object)hexres == null)
throw new ArgumentNullException("hexres");
if (count < 0)
throw new ArgumentOutOfRangeException("count", "Count cannot be less than zero");
if (offset < 0 || offset + count > hexres.Length)
throw new ArgumentOutOfRangeException("offset");
while (--count >= 0)
{
crc = (ushort)((crc << 8) ^ CrcTable[((crc >> 8) ^ hexres[offset++]) & 0xff]);
Console.WriteLine(crc);
Console.ReadLine();
}
}
#endregion
#region [ Static ]
// Static Fields
private readonly static ushort[] CrcTable = new ushort[]
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
#endregion
}
}
}
Please help me and correct my program?
Thanks,
Owais
