// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies CPCEMU 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 © 2011-2023 Natalia Portillo
// ****************************************************************************/

using System;
using System.IO;
using System.Text;
using Aaru.CommonTypes.Interfaces;
using Aaru.Console;

namespace Aaru.DiscImages
{
    public sealed partial class Cpcdsk
    {
        /// <inheritdoc />
        public bool Identify(IFilter imageFilter)
        {
            Stream stream = imageFilter.GetDataForkStream();
            stream.Seek(0, SeekOrigin.Begin);

            if(stream.Length < 512)
                return false;

            byte[] headerB = new byte[256];
            stream.Read(headerB, 0, 256);

            int pos;

            for(pos = 0; pos < 254; pos++)
            {
                if(headerB[pos]     == 0x0D &&
                   headerB[pos + 1] == 0x0A)
                    break;
            }

            if(pos >= 254)
                return false;

            string magic = Encoding.ASCII.GetString(headerB, 0, pos);

            AaruConsole.DebugWriteLine("CPCDSK plugin", "magic = \"{0}\"", magic);

            return string.Compare(CPCDSK_ID, magic, StringComparison.InvariantCultureIgnoreCase) == 0 ||
                   string.Compare(EDSK_ID, magic, StringComparison.InvariantCultureIgnoreCase)   == 0 ||
                   string.Compare(DU54_ID, magic, StringComparison.InvariantCultureIgnoreCase)   == 0;
        }
    }
}