www.pudn.com > motion.zip > ByteArrayUtils.cs

namespace videosource 
{ 
	using System; 
 
	/// 
 
	/// Some array utilities 
	/// 
 
	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; 
		} 
	} 
}