System.Uri.Uri.GetChar C# (CSharp) Method

		private static int GetChar (string str, int offset, int length)
		{
			int val = 0;
			int end = length + offset;
			for (int i = offset; i < end; i++) {
				char c = str [i];
				if (c > 127)
					return -1;

				int current = GetInt ((byte) c);
				if (current == -1)
					return -1;
				val = (val << 4) + current;
			}

			return val;
		}