//
//  GCFChecksumModule.cs - implements module for calculating checksum used in Valve GCF archives
//
//  Author:
//       Michael Becker <alcexhim@gmail.com>
//
//  Copyright (c) 2011-2020 Mike Becker's Software
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;

namespace UniversalEditor.Checksum.Modules.GCF
{
	/// <summary>
	/// Implements module for calculating checksum used in Valve GCF archives.
	/// </summary>
	public class GCFChecksumModule : ChecksumModule
	{
		public override string Name
		{
			get { return "GCF"; }
		}

		public override void Update(byte[] buffer, int offset, int count)
		{
			Adler32.Adler32 adler32 = new Adler32.Adler32();
			CRC32.CRC32ChecksumModule crc32 = new CRC32.CRC32ChecksumModule();
			Value = (adler32.Calculate(buffer) ^ crc32.Calculate(buffer));
		}
		public override void Update(int value)
		{
			throw new NotImplementedException();
		}
	}
}