Adds support for Apple DOS filesystem, closes #33.

DiscImageChef.Filesystems/AppleDOS/Dir.cs

@@ -0,0 +1,153 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Dir.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Apple DOS filesystem plugin.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Methods to handle Apple DOS filesystem catalog (aka directory).
+//
+// --[ 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 © 2011-2016 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace DiscImageChef.Filesystems.AppleDOS
+{
+    partial class AppleDOS : Filesystem
+    {
+        /// <summary>
+        /// Solves a symbolic link.
+        /// </summary>
+        /// <param name="path">Link path.</param>
+        /// <param name="dest">Link destination.</param>
+        public override Errno ReadLink(string path, ref string dest)
+        {
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            return Errno.NotSupported;
+        }
+
+        /// <summary>
+        /// Lists contents from a directory.
+        /// </summary>
+        /// <param name="path">Directory path.</param>
+        /// <param name="contents">Directory contents.</param>
+        public override Errno ReadDir(string path, ref List<string> contents)
+        {
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            if(!string.IsNullOrEmpty(path) && string.Compare(path, "/", StringComparison.OrdinalIgnoreCase) != 0)
+                return Errno.NotSupported;
+
+            contents = new List<string>();
+            foreach(string ent in catalogCache.Keys)
+                contents.Add(ent);
+
+            if(debug)
+            {
+                contents.Add("$");
+                contents.Add("$Boot");
+                contents.Add("$Vtoc");
+            }
+
+            contents.Sort();
+            return Errno.NoError;
+        }
+
+        Errno ReadCatalog()
+        {
+            MemoryStream catalogMs = new MemoryStream();
+            ulong lba = (ulong)((vtoc.catalogTrack * sectorsPerTrack) + vtoc.catalogSector);
+            totalFileEntries = 0;
+            catalogCache = new Dictionary<string, ushort>();
+            fileTypeCache = new Dictionary<string, byte>();
+            fileSizeCache = new Dictionary<string, int>();
+            lockedFiles = new List<string>();
+
+            if(lba == 0 || lba > device.ImageInfo.sectors)
+                return Errno.InvalidArgument;
+
+            while(lba != 0)
+            {
+                usedSectors++;
+                byte[] catSector_b = device.ReadSector(lba);
+                totalFileEntries += 7;
+                if(debug)
+                    catalogMs.Write(catSector_b, 0, catSector_b.Length);
+
+                // Read the catalog sector
+                CatalogSector catSector = new CatalogSector();
+                IntPtr catPtr = Marshal.AllocHGlobal(256);
+                Marshal.Copy(catSector_b, 0, catPtr, 256);
+                catSector = (CatalogSector)Marshal.PtrToStructure(catPtr, typeof(CatalogSector));
+                Marshal.FreeHGlobal(catPtr);
+
+                foreach(FileEntry entry in catSector.entries)
+                {
+                    if(entry.extentTrack > 0)
+                    {
+                        track1UsedByFiles |= entry.extentTrack == 1;
+                        track2UsedByFiles |= entry.extentTrack == 2;
+
+                        byte[] filename_b = new byte[30];
+                        ushort ts = (ushort)((entry.extentTrack << 8) | entry.extentSector);
+
+                        // Apple DOS has high byte set over ASCII.
+                        for(int i = 0; i < 30; i++)
+                            filename_b[i] = (byte)(entry.filename[i] & 0x7F);
+
+                        string filename = StringHandlers.SpacePaddedToString(filename_b);
+
+                        if(!catalogCache.ContainsKey(filename))
+                            catalogCache.Add(filename, ts);
+
+                        if(!fileTypeCache.ContainsKey(filename))
+                            fileTypeCache.Add(filename, (byte)(entry.typeAndFlags & 0x7F));
+
+                        if(!fileSizeCache.ContainsKey(filename))
+                            fileSizeCache.Add(filename, entry.length * vtoc.bytesPerSector);
+
+                        if((entry.typeAndFlags & 0x80) == 0x80 && !lockedFiles.Contains(filename))
+                            lockedFiles.Add(filename);
+                    }
+                }
+
+                lba = (ulong)((catSector.trackOfNext * sectorsPerTrack) + catSector.sectorOfNext);
+
+                if(lba > device.ImageInfo.sectors)
+                    break;
+            }
+
+            if(debug)
+                catalogBlocks = catalogMs.ToArray();
+
+            return Errno.NoError;
+        }
+    }
+}