Check if the array contains needle on specified position : Array Util « Collections Data Structure « C# / C Sharp






  1. C# / C Sharp
  2. Collections Data Structure
  3. Array Util

Check if the array contains needle on specified position

        

namespace videosource
{
  using System;

  /// <summary>
  /// Some array utilities
  /// </summary>
  internal class ByteArrayUtils
  {
    // Check if the array contains needle on specified position
    public static bool Compare(byte[] array, byte[] needle, int startIndex)
    {
      int  needleLen = needle.Length;
      // compare
      for (int i = 0, p = startIndex; i < needleLen; i++, p++)
      {
        if (array[p] != needle[i])
        {
          return false;
        }
      }
      return true;
    }

    // Find subarray in array
    public static int Find(byte[] array, byte[] needle, int startIndex, int count)
    {
      int  needleLen = needle.Length;
      int  index;

      while (count >= needleLen)
      {
        index = Array.IndexOf(array, needle[0], startIndex, count - needleLen + 1);

        if (index == -1)
          return -1;

        int i, p;
        // check for needle
        for (i = 0, p = index; i < needleLen; i++, p++)
        {
          if (array[p] != needle[i])
          {
            break;
          }
        }

        if (i == needleLen)
        {
          // found needle
          return index;
        }

        count -= (index - startIndex + 1);
        startIndex = index + 1;
      }
      return -1;
    }
  }
}








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