Aaru/Aaru.Filesystems/AppleDOS/Super.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Super.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Apple DOS filesystem plugin.
//
// --[ 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 © 2011-2025 Natalia Portillo
// ****************************************************************************/

using System.Collections.Generic;
using Aaru.CommonTypes.AaruMetadata;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
using Aaru.Logging;
using Claunia.Encoding;
using Encoding = System.Text.Encoding;
using FileSystemInfo = Aaru.CommonTypes.Structs.FileSystemInfo;
using Partition = Aaru.CommonTypes.Partition;

namespace Aaru.Filesystems;

public sealed partial class AppleDOS
{
#region IReadOnlyFilesystem Members

    /// <inheritdoc />
    public ErrorNumber Mount(IMediaImage                imagePlugin, Partition partition, Encoding encoding,
                             Dictionary<string, string> options,     string    @namespace)
    {
        _device   = imagePlugin;
        _start    = partition.Start;
        _encoding = encoding ?? new Apple2();

        if(_device.Info.Sectors != 455 && _device.Info.Sectors != 560)
        {
            AaruLogging.Debug(MODULE_NAME, Localization.Incorrect_device_size);

            return ErrorNumber.InOutError;
        }

        if(_start > 0)
        {
            AaruLogging.Debug(MODULE_NAME, Localization.Partitions_are_not_supported);

            return ErrorNumber.InOutError;
        }

        if(_device.Info.SectorSize != 256)
        {
            AaruLogging.Debug(MODULE_NAME, Localization.Incorrect_sector_size);

            return ErrorNumber.InOutError;
        }

        _sectorsPerTrack = _device.Info.Sectors == 455 ? 13 : 16;

        // Read the VTOC
        ErrorNumber error = _device.ReadSector((ulong)(17 * _sectorsPerTrack), false, out _vtocBlocks, out _);

        if(error != ErrorNumber.NoError) return error;

        _vtoc = Marshal.ByteArrayToStructureLittleEndian<Vtoc>(_vtocBlocks);

        _track1UsedByFiles = false;
        _track2UsedByFiles = false;
        _usedSectors       = 1;

        error = ReadCatalog();

        if(error != ErrorNumber.NoError)
        {
            AaruLogging.Debug(MODULE_NAME, Localization.Unable_to_read_catalog);

            return error;
        }

        _fileSizeCache = new Dictionary<string, int>();

        error = CacheAllFiles();

        if(error != ErrorNumber.NoError)
        {
            AaruLogging.Debug(MODULE_NAME, Localization.Unable_cache_all_files);

            return error;
        }

        // Create XML metadata for mounted filesystem
        Metadata = new FileSystem
        {
            Bootable    = true,
            Clusters    = _device.Info.Sectors,
            ClusterSize = _vtoc.bytesPerSector,
            Files       = (ulong)_catalogCache.Count,
            Type        = FS_TYPE
        };

        Metadata.FreeClusters = Metadata.Clusters - _usedSectors;

        options ??= GetDefaultOptions();

        if(options.TryGetValue("debug", out string debugString)) bool.TryParse(debugString, out _debug);

        _mounted = true;

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public ErrorNumber Unmount()
    {
        _mounted       = false;
        _extentCache   = null;
        _fileCache     = null;
        _catalogCache  = null;
        _fileSizeCache = null;

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public ErrorNumber StatFs(out FileSystemInfo stat)
    {
        stat = new FileSystemInfo
        {
            Blocks         = _device.Info.Sectors,
            FilenameLength = 30,
            Files          = (ulong)_catalogCache.Count,
            PluginId       = Id,
            Type           = FS_TYPE
        };

        stat.FreeFiles  = _totalFileEntries - stat.Files;
        stat.FreeBlocks = stat.Blocks       - _usedSectors;

        return ErrorNumber.NoError;
    }

#endregion
}