Calculate the CRC16 over a byte-array segment - CSharp System

CSharp examples for System:Byte Array

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Description

Calculate the CRC16 over a byte-array segment

Demo Code

/*/*from ww  w . j  ava  2  s  .c o  m*/
 * Copyright 2012 Mario Vernari (http://cetdevelop.codeplex.com/)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;

public class Main{
        /// <summary>
        /// Calculate the CRC16 over a byte-array segment
        /// </summary>
        /// <param name="buffer">The source byte-array</param>
        /// <param name="offset">The index of the first byte to be considered</param>
        /// <param name="count">The number of the bytes to be considered</param>
        /// <returns>The resulting CRC16 value</returns>
        /// <remarks>
        /// Ported from plain-C source found here: http://www.modbustools.com/modbus_crc16.htm
        /// </remarks>
        public static ushort CalcCRC16(
            byte[] buffer,
            int offset,
            int count)
        {
            ushort result = 0xFFFF;

            while (count-- > 0)
            {
                if (buffer.Length <= offset)
                    break;
                var temp = (byte)(buffer[offset++] ^ result);
                result >>= 8;
                result ^= CrcTable[temp];
            }

            return result;
        }
}

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