Implemented missing methods, for full MFS read-only support.

DiscImageChef.Filesystems/AppleMFS/File.cs

@@ -30,6 +30,10 @@
 // Copyright © 2011-2016 Natalia Portillo
 // ****************************************************************************/
 
+using System;
+using System.IO;
+using DiscImageChef.Console;
+
 namespace DiscImageChef.Filesystems.AppleMFS
 {
     // Information from Inside Macintosh Volume II
@@ -37,28 +41,323 @@ namespace DiscImageChef.Filesystems.AppleMFS
     {
         public override Errno MapBlock(string path, long fileBlock, ref long deviceBlock)
         {
-            return Errno.NotImplemented;
+            deviceBlock = new long();
+
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            string[] pathElements = path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            if(pathElements.Length != 1)
+                return Errno.NotSupported;
+
+            uint fileID;
+            MFS_FileEntry entry;
+
+            if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out fileID))
+                return Errno.NoSuchFile;
+
+            if(!idToEntry.TryGetValue(fileID, out entry))
+                return Errno.NoSuchFile;
+
+            if(fileBlock > (entry.flPyLen / volMDB.drAlBlkSiz))
+                return Errno.InvalidArgument;
+
+            uint nextBlock = entry.flStBlk;
+            long relBlock = 0;
+
+            while(true)
+            {
+                if(relBlock == fileBlock)
+                {
+                    deviceBlock = ((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + (long)partitionStart;
+                    return Errno.NoError;
+                }
+
+                if(blockMap[nextBlock] == BMAP_FREE || blockMap[nextBlock] == BMAP_LAST)
+                    break;
+
+                nextBlock = blockMap[nextBlock];
+                relBlock++;
+            }
+
+            return Errno.InOutError;
         }
 
         public override Errno GetAttributes(string path, ref FileAttributes attributes)
         {
-            return Errno.NotImplemented;
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            string[] pathElements = path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            if(pathElements.Length != 1)
+                return Errno.NotSupported;
+
+            uint fileID;
+            MFS_FileEntry entry;
+
+            if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out fileID))
+                return Errno.NoSuchFile;
+
+            if(!idToEntry.TryGetValue(fileID, out entry))
+                return Errno.NoSuchFile;
+
+            attributes = new FileAttributes();
+            MFS_FinderFlags fdFlags = (MFS_FinderFlags)BigEndianBitConverter.ToUInt16(entry.flUsrWds, 0x08);
+
+            if(fdFlags.HasFlag(MFS_FinderFlags.kIsAlias))
+                attributes |= FileAttributes.Alias;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kHasBundle))
+                attributes |= FileAttributes.Bundle;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kHasBeenInited))
+                attributes |= FileAttributes.HasBeenInited;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kHasCustomIcon))
+                attributes |= FileAttributes.HasCustomIcon;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kHasNoINITs))
+                attributes |= FileAttributes.HasNoINITs;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kIsInvisible))
+                attributes |= FileAttributes.Hidden;
+            if(entry.flFlags.HasFlag(MFS_FileFlags.Locked))
+                attributes |= FileAttributes.Immutable;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kIsOnDesk))
+                attributes |= FileAttributes.IsOnDesk;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kIsShared))
+                attributes |= FileAttributes.Shared;
+            if(fdFlags.HasFlag(MFS_FinderFlags.kIsStationery))
+                attributes |= FileAttributes.Stationery;
+
+            if(!attributes.HasFlag(FileAttributes.Alias) &&
+               !attributes.HasFlag(FileAttributes.Bundle) &&
+               !attributes.HasFlag(FileAttributes.Stationery))
+                attributes |= FileAttributes.File;
+
+            attributes |= FileAttributes.BlockUnits;
+            
+            return Errno.NoError;
         }
 
         public override Errno Read(string path, long offset, long size, ref byte[] buf)
         {
-            return Errno.NotImplemented;
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            byte[] file;
+            Errno error = Errno.NoError;
+
+            if(debug && string.Compare(path, "$", StringComparison.InvariantCulture) == 0)
+                file = directoryBlocks;
+            else if(debug && string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 && bootBlocks != null)
+                file = bootBlocks;
+            else if(debug && string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0)
+                file = blockMapBytes;
+            else if(debug && string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
+                file = mdbBlocks;
+            else
+                error = ReadFile(path, out file, false, false);
+            
+            if(error != Errno.NoError)
+                return error;
+
+            if(size == 0)
+            {
+                buf = new byte[0];
+                return Errno.NoError;
+            }
+
+            if(offset >= file.Length)
+                return Errno.InvalidArgument;
+
+            if(size + offset >= file.Length)
+                size = file.Length - offset;
+
+            buf = new byte[size];
+
+            Array.Copy(file, offset, buf, 0, size);
+
+            return Errno.NoError;
         }
 
         public override Errno Stat(string path, ref FileEntryInfo stat)
         {
-            return Errno.NotImplemented;
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            string[] pathElements = path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            if(pathElements.Length != 1)
+                return Errno.NotSupported;
+
+            if(debug)
+            {
+                if(string.Compare(path, "$", StringComparison.InvariantCulture) == 0 ||
+                   string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 ||
+                   string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0 ||
+                   string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
+                {
+                    stat = new FileEntryInfo();
+                    stat.Attributes = new FileAttributes();
+                    stat.Attributes = FileAttributes.System;
+                    stat.BlockSize = device.GetSectorSize();
+                    stat.DeviceNo = 0;
+                    stat.GID = 0;
+                    stat.Inode = 0;
+                    stat.Links = 1;
+                    stat.Mode = 0x124;
+                    stat.UID = 0;
+
+                    if(string.Compare(path, "$", StringComparison.InvariantCulture) == 0)
+                    {
+                        stat.Blocks = (directoryBlocks.Length / stat.BlockSize) + (directoryBlocks.Length % stat.BlockSize);
+                        stat.Length = directoryBlocks.Length;
+                    }
+                    else if(string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0)
+                    {
+                        stat.Blocks = (blockMapBytes.Length / stat.BlockSize) + (blockMapBytes.Length % stat.BlockSize);
+                        stat.Length = blockMapBytes.Length;
+                    }
+                    else if(string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 && bootBlocks != null)
+                    {
+                        stat.Blocks = (bootBlocks.Length / stat.BlockSize) + (bootBlocks.Length % stat.BlockSize);
+                        stat.Length = bootBlocks.Length;
+                    }
+                    else if(string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
+                    {
+                        stat.Blocks = (mdbBlocks.Length / stat.BlockSize) + (mdbBlocks.Length % stat.BlockSize);
+                        stat.Length = mdbBlocks.Length;
+                    }
+                    else
+                        return Errno.InvalidArgument;
+
+                    return Errno.NoError;
+                }
+            }
+
+            uint fileID;
+            MFS_FileEntry entry;
+
+            if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out fileID))
+                return Errno.NoSuchFile;
+
+            if(!idToEntry.TryGetValue(fileID, out entry))
+                return Errno.NoSuchFile;
+
+            FileAttributes attr = new FileAttributes();
+            Errno error = GetAttributes(path, ref attr);
+            if(error != Errno.NoError)
+                return error;
+
+            stat = new FileEntryInfo();
+            stat.Attributes = attr;
+            stat.Blocks = entry.flLgLen / volMDB.drAlBlkSiz;
+            stat.BlockSize = volMDB.drAlBlkSiz;
+            stat.CreationTime = DateHandlers.MacToDateTime(entry.flCrDat);
+            stat.DeviceNo = 0;
+            stat.GID = 0;
+            stat.Inode = entry.flFlNum;
+            stat.LastWriteTime = DateHandlers.MacToDateTime(entry.flMdDat);
+            stat.Length = entry.flPyLen;
+            stat.Links = 1;
+            stat.Mode = 0x124;
+            stat.UID = 0;
+
+            return Errno.NoError;
         }
 
         public override Errno ReadLink(string path, ref string dest)
         {
             return Errno.NotImplemented;
         }
+
+        Errno ReadFile(string path, out byte[] buf, bool resourceFork, bool tags)
+        {
+            buf = null;
+
+            if(!mounted)
+                return Errno.AccessDenied;
+
+            string[] pathElements = path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            if(pathElements.Length != 1)
+                return Errno.NotSupported;
+
+            uint fileID;
+            MFS_FileEntry entry;
+
+            if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out fileID))
+                return Errno.NoSuchFile;
+
+            if(!idToEntry.TryGetValue(fileID, out entry))
+                return Errno.NoSuchFile;
+
+            uint nextBlock;
+
+            if(resourceFork)
+            {
+                if(entry.flRPyLen == 0)
+                {
+                    buf = new byte[0];
+                    return Errno.NoError;
+                }
+                nextBlock = entry.flRStBlk;
+            }
+            else
+            {
+                if(entry.flPyLen == 0)
+                {
+                    buf = new byte[0];
+                    return Errno.NoError;
+                }
+
+                nextBlock = entry.flStBlk;
+            }
+
+            MemoryStream ms = new MemoryStream();
+            byte[] sectors;
+
+            do
+            {
+                if(tags)
+                    sectors = device.ReadSectorsTag((ulong)((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + partitionStart, (uint)sectorsPerBlock, ImagePlugins.SectorTagType.AppleSectorTag);
+                else
+                    sectors = device.ReadSectors((ulong)((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + partitionStart, (uint)sectorsPerBlock);
+
+                ms.Write(sectors, 0, sectors.Length);
+
+                if(blockMap[nextBlock] == BMAP_FREE)
+                {
+                    DicConsole.ErrorWriteLine("File truncated at block {0}", nextBlock);
+                    break;
+                }
+
+                nextBlock = blockMap[nextBlock];
+            }
+            while(nextBlock > BMAP_LAST);
+
+            if(tags)
+                buf = ms.ToArray();
+            else
+            {
+                if(resourceFork)
+                {
+                    if(ms.Length < entry.flRLgLen)
+                        buf = ms.ToArray();
+                    else
+                    {
+                        buf = new byte[entry.flRLgLen];
+                        Array.Copy(ms.ToArray(), 0, buf, 0, buf.Length);
+                    }
+                }
+                else
+                {
+                    if(ms.Length < entry.flLgLen)
+                        buf = ms.ToArray();
+                    else
+                    {
+                        buf = new byte[entry.flLgLen];
+                        Array.Copy(ms.ToArray(), 0, buf, 0, buf.Length);
+                    }
+                }
+            }
+
+            return Errno.NoError;
+        }
     }
 }