Aaru/Aaru.Images/AppleDOS/Write.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Write.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Writes interleaved Apple ][ 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 © 2011-2021 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.IO;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Structs;
using Schemas;

namespace Aaru.DiscImages
{
    public sealed partial class AppleDos
    {
        public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
                           uint sectorSize)
        {
            if(sectorSize != 256)
            {
                ErrorMessage = "Unsupported sector size";

                return false;
            }

            if(mediaType != MediaType.Apple33SS)
            {
                ErrorMessage = $"Unsupported media format {mediaType}";

                return false;
            }

            if(sectors > uint.MaxValue)
            {
                ErrorMessage = "Too many sectors";

                return false;
            }

            _imageInfo = new ImageInfo
            {
                MediaType  = mediaType,
                SectorSize = sectorSize,
                Sectors    = sectors
            };

            try
            {
                _writingStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
            }
            catch(IOException e)
            {
                ErrorMessage = $"Could not create new image file, exception {e.Message}";

                return false;
            }

            _deinterleaved = new byte[35 * 16 * 256];
            _extension     = Path.GetExtension(path);

            IsWriting    = true;
            ErrorMessage = null;

            return true;
        }

        public bool WriteMediaTag(byte[] data, MediaTagType tag)
        {
            ErrorMessage = "Unsupported feature";

            return false;
        }

        public bool WriteSector(byte[] data, ulong sectorAddress) => WriteSectors(data, sectorAddress, 1);

        public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
        {
            if(!IsWriting)
            {
                ErrorMessage = "Tried to write on a non-writable image";

                return false;
            }

            if(data.Length % _imageInfo.SectorSize != 0)
            {
                ErrorMessage = "Incorrect data size";

                return false;
            }

            if(sectorAddress + length > _imageInfo.Sectors)
            {
                ErrorMessage = "Tried to write past image size";

                return false;
            }

            Array.Copy(data, 0, _deinterleaved, (int)(sectorAddress * _imageInfo.SectorSize), data.Length);

            ErrorMessage = "";

            return true;
        }

        public bool WriteSectorLong(byte[] data, ulong sectorAddress)
        {
            ErrorMessage = "Writing sectors with tags is not supported.";

            return false;
        }

        public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
        {
            ErrorMessage = "Writing sectors with tags is not supported.";

            return false;
        }

        public bool Close()
        {
            if(!IsWriting)
            {
                ErrorMessage = "Image is not opened for writing";

                return false;
            }

            bool isDos = _deinterleaved[0x11001] == 17  && _deinterleaved[0x11002] < 16 &&
                         _deinterleaved[0x11027] <= 122 && _deinterleaved[0x11034] == 35 &&
                         _deinterleaved[0x11035] == 16  && _deinterleaved[0x11036] == 0 && _deinterleaved[0x11037] == 1;

            byte[] tmp = new byte[_deinterleaved.Length];

            int[] offsets = _extension == ".do"
                                ? isDos
                                      ? _deinterleave
                                      : _interleave
                                : isDos
                                    ? _interleave
                                    : _deinterleave;

            for(int t = 0; t < 35; t++)
            {
                for(int s = 0; s < 16; s++)
                    Array.Copy(_deinterleaved, (t * 16 * 256) + (offsets[s] * 256), tmp, (t * 16 * 256) + (s * 256),
                               256);
            }

            _writingStream.Seek(0, SeekOrigin.Begin);
            _writingStream.Write(tmp, 0, tmp.Length);

            _writingStream.Flush();
            _writingStream.Close();

            IsWriting    = false;
            ErrorMessage = "";

            return true;
        }

        public bool SetMetadata(ImageInfo metadata) => true;

        public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack) => true;

        public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
        {
            ErrorMessage = "Writing sectors with tags is not supported.";

            return false;
        }

        public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
        {
            ErrorMessage = "Writing sectors with tags is not supported.";

            return false;
        }

        public bool SetDumpHardware(List<DumpHardwareType> dumpHardware) => false;

        public bool SetCicmMetadata(CICMMetadataType metadata) => false;
    }
}