Aaru/Aaru.Images/AppleDOS/Write.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// 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 © 2011-2020 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 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 = $"Unsupport 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;
    }
}