Aaru/DiscImageChef.Filesystems/CPM/CPM.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : CPM.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : CP/M filesystem plugin.
//
// --[ Description ] ----------------------------------------------------------
//
//     Constructors and common variables for the CP/M 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 © 2011-2017 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.Text;
using DiscImageChef.ImagePlugins;

namespace DiscImageChef.Filesystems.CPM
{
    partial class CPM : Filesystem
    {
        bool mounted;
        readonly ImagePlugin device;
        ulong partStart;
        ulong partEnd;

        /// <summary>
        /// Stores all known CP/M disk definitions
        /// </summary>
        CpmDefinitions definitions;
        /// <summary>
        /// True if <see cref="Identify"/> thinks this is a CP/M filesystem
        /// </summary>
        bool cpmFound;
        /// <summary>
        /// If <see cref="Identify"/> thinks this is a CP/M filesystem, this is the definition for it
        /// </summary>
        CpmDefinition workingDefinition;
        /// <summary>
        /// CP/M disc parameter block (on-memory)
        /// </summary>
        DiscParameterBlock dpb;
        /// <summary>
        /// Sector deinterleaving mask
        /// </summary>
        int[] sectorMask;
        /// <summary>
        /// The volume label, if the CP/M filesystem contains one
        /// </summary>
        string label;
        /// <summary>
        /// True if there are timestamps in Z80DOS or DOS+ format
        /// </summary>
        bool thirdPartyTimestamps;
        /// <summary>
        /// True if there are CP/M 3 timestamps
        /// </summary>
        bool standardTimestamps;
        /// <summary>
        /// Timestamp in volume label for creation
        /// </summary>
        byte[] labelCreationDate;
        /// <summary>
        /// Timestamp in volume label for update
        /// </summary>
        byte[] labelUpdateDate;

        /// <summary>
        /// Cached <see cref="FileSystemInfo"/> 
        /// </summary>
        FileSystemInfo cpmStat;
        /// <summary>
        /// Cached directory listing
        /// </summary>
        List<string> dirList;
        /// <summary>
        /// Cached file data
        /// </summary>
        Dictionary<string, byte[]> fileCache;
        /// <summary>
        /// Cached file <see cref="FileEntryInfo"/> 
        /// </summary>
        Dictionary<string, FileEntryInfo> statCache;
        /// <summary>
        /// Cached file passwords
        /// </summary>
        Dictionary<string, byte[]> passwordCache;
        /// <summary>
        /// Cached file passwords, decoded
        /// </summary>
        Dictionary<string, byte[]> decodedPasswordCache;

        public CPM()
        {
            Name = "CP/M File System";
            PluginUUID = new Guid("AA2B8585-41DF-4E3B-8A35-D1A935E2F8A1");
            CurrentEncoding = Encoding.GetEncoding("IBM437");
        }

        public CPM(ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, Encoding encoding)
        {
            device = imagePlugin;
            partStart = partitionStart;
            partEnd = partitionEnd;
            Name = "CP/M File System";
            PluginUUID = new Guid("AA2B8585-41DF-4E3B-8A35-D1A935E2F8A1");
            if(encoding == null)
                CurrentEncoding = Encoding.GetEncoding("IBM437");
        }
    }
}