System.Web.HttpMultipart.MoveToNextBoundary C# (CSharp) Method

		long MoveToNextBoundary ()
		{
			long retval = 0;
			bool got_cr = false;

			int state = 0;
			int c = data.ReadByte ();
			while (true) {
				if (c == -1)
					return -1;

				if (state == 0 && c == LF) {
					retval = data.Position - 1;
					if (got_cr)
						retval--;
					state = 1;
					c = data.ReadByte ();
				} else if (state == 0) {
					got_cr = (c == CR);
					c = data.ReadByte ();
				} else if (state == 1 && c == '-') {
					c = data.ReadByte ();
					if (c == -1)
						return -1;

					if (c != '-') {
						state = 0;
						got_cr = false;
						continue; // no ReadByte() here
					}

					int nread = data.Read (buffer, 0, buffer.Length);
					int bl = buffer.Length;
					if (nread != bl)
						return -1;

					if (!CompareBytes (boundary_bytes, buffer)) {
						state = 0;
						data.Position = retval + 2;
						if (got_cr) {
							data.Position++;
							got_cr = false;
						}
						c = data.ReadByte ();
						continue;
					}

					if (buffer [bl - 2] == '-' && buffer [bl - 1] == '-') {
						at_eof = true;
					} else if (buffer [bl - 2] != CR || buffer [bl - 1] != LF) {
						state = 0;
						data.Position = retval + 2;
						if (got_cr) {
							data.Position++;
							got_cr = false;
						}
						c = data.ReadByte ();
						continue;
					}
					data.Position = retval + 2;
					if (got_cr)
						data.Position++;
					break;
				} else {
					// state == 1
					state = 0; // no ReadByte() here
				}
			}

			return retval;
		}