// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies Anex86 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 © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System.IO;
using System.Runtime.InteropServices;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.Console;

namespace DiscImageChef.DiscImages
{
    public partial class Anex86
    {
        public bool Identify(IFilter imageFilter)
        {
            Stream stream = imageFilter.GetDataForkStream();
            stream.Seek(0, SeekOrigin.Begin);

            fdihdr = new Anex86Header();

            if(stream.Length < Marshal.SizeOf(fdihdr)) return false;

            byte[] hdrB = new byte[Marshal.SizeOf(fdihdr)];
            stream.Read(hdrB, 0, hdrB.Length);

            GCHandle handle = GCHandle.Alloc(hdrB, GCHandleType.Pinned);
            fdihdr = (Anex86Header)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(Anex86Header));
            handle.Free();

            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.unknown = {0}",   fdihdr.unknown);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.hddtype = {0}",   fdihdr.hddtype);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.hdrSize = {0}",   fdihdr.hdrSize);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.dskSize = {0}",   fdihdr.dskSize);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.bps = {0}",       fdihdr.bps);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.spt = {0}",       fdihdr.spt);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.heads = {0}",     fdihdr.heads);
            DicConsole.DebugWriteLine("Anex86 plugin", "fdihdr.cylinders = {0}", fdihdr.cylinders);

            return stream.Length  == fdihdr.hdrSize + fdihdr.dskSize &&
                   fdihdr.dskSize == fdihdr.bps * fdihdr.spt * fdihdr.heads * fdihdr.cylinders;
        }
    }
}