Aaru/DiscImageChef.DiscImages/BLU/Identify.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies Basic Lisa Utility disk images.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library 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
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.IO;
using DiscImageChef.CommonTypes.Interfaces;

namespace DiscImageChef.DiscImages
{
    public partial class Blu
    {
        public bool Identify(IFilter imageFilter)
        {
            Stream stream = imageFilter.GetDataForkStream();
            stream.Seek(0, SeekOrigin.Begin);

            if(stream.Length < 0x200) return false;

            byte[] header = new byte[0x17];
            stream.Read(header, 0, 0x17);

            BluHeader tmpHdr = new BluHeader {DeviceName = new byte[0x0D]};

            Array.Copy(header, 0, tmpHdr.DeviceName, 0, 0x0D);
            tmpHdr.DeviceType    = BigEndianBitConverter.ToUInt32(header, 0x0C) & 0x00FFFFFF;
            tmpHdr.DeviceBlocks  = BigEndianBitConverter.ToUInt32(header, 0x11) & 0x00FFFFFF;
            tmpHdr.BytesPerBlock = BigEndianBitConverter.ToUInt16(header, 0x15);

            for(int i = 0; i < 0xD; i++)
                if(tmpHdr.DeviceName[i] < 0x20)
                    return false;

            return (tmpHdr.BytesPerBlock & 0xFE00) == 0x200;
        }
    }
}