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375 lines
16 KiB
C#
375 lines
16 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : SaveDskF.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages IBM SaveDskF disk images.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.Console;
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using DiscImageChef.Filters;
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namespace DiscImageChef.DiscImages
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{
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public class SaveDskF : IMediaImage
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{
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const ushort SDF_MAGIC_OLD = 0x58AA;
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const ushort SDF_MAGIC = 0x59AA;
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const ushort SDF_MAGIC_COMPRESSED = 0x5AAA;
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uint calculatedChk;
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byte[] decodedDisk;
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SaveDskFHeader header;
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ImageInfo imageInfo;
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public SaveDskF()
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{
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imageInfo = new ImageInfo
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{
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ReadableSectorTags = new List<SectorTagType>(),
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ReadableMediaTags = new List<MediaTagType>(),
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HasPartitions = false,
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HasSessions = false,
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Version = null,
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Application = null,
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ApplicationVersion = null,
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Creator = null,
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Comments = null,
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MediaManufacturer = null,
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MediaModel = null,
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MediaSerialNumber = null,
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MediaBarcode = null,
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MediaPartNumber = null,
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MediaSequence = 0,
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LastMediaSequence = 0,
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DriveManufacturer = null,
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DriveModel = null,
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DriveSerialNumber = null,
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DriveFirmwareRevision = null
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};
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}
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public string Name => "IBM SaveDskF";
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public Guid Id => new Guid("288CE058-1A51-4034-8C45-5A256CAE1461");
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public ImageInfo Info => imageInfo;
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public string Format => "IBM SaveDskF";
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public List<Partition> Partitions =>
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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public List<Track> Tracks =>
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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public List<Session> Sessions =>
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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public bool Identify(IFilter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 41) return false;
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byte[] hdr = new byte[40];
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stream.Read(hdr, 0, 40);
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header = new SaveDskFHeader();
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IntPtr hdrPtr = Marshal.AllocHGlobal(40);
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Marshal.Copy(hdr, 0, hdrPtr, 40);
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header = (SaveDskFHeader)Marshal.PtrToStructure(hdrPtr, typeof(SaveDskFHeader));
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Marshal.FreeHGlobal(hdrPtr);
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return (header.magic == SDF_MAGIC || header.magic == SDF_MAGIC_COMPRESSED ||
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header.magic == SDF_MAGIC_OLD) && header.fatCopies <= 2 && header.padding == 0 &&
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header.commentOffset < stream.Length && header.dataOffset < stream.Length;
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}
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public bool Open(IFilter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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byte[] hdr = new byte[40];
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stream.Read(hdr, 0, 40);
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header = new SaveDskFHeader();
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IntPtr hdrPtr = Marshal.AllocHGlobal(40);
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Marshal.Copy(hdr, 0, hdrPtr, 40);
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header = (SaveDskFHeader)Marshal.PtrToStructure(hdrPtr, typeof(SaveDskFHeader));
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Marshal.FreeHGlobal(hdrPtr);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.magic = 0x{0:X4}", header.magic);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.mediaType = 0x{0:X2}", header.mediaType);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.sectorSize = {0}", header.sectorSize);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.clusterMask = {0}", header.clusterMask);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.clusterShift = {0}", header.clusterShift);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.reservedSectors = {0}", header.reservedSectors);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.fatCopies = {0}", header.fatCopies);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.rootEntries = {0}", header.rootEntries);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.firstCluster = {0}", header.firstCluster);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.clustersCopied = {0}", header.clustersCopied);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.sectorsPerFat = {0}", header.sectorsPerFat);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.checksum = 0x{0:X8}", header.checksum);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.cylinders = {0}", header.cylinders);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.heads = {0}", header.heads);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.sectorsPerTrack = {0}", header.sectorsPerTrack);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.padding = {0}", header.padding);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.sectorsCopied = {0}", header.sectorsCopied);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.commentOffset = {0}", header.commentOffset);
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DicConsole.DebugWriteLine("SaveDskF plugin", "header.dataOffset = {0}", header.dataOffset);
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if(header.dataOffset == 0 && header.magic == SDF_MAGIC_OLD) header.dataOffset = 512;
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byte[] cmt = new byte[header.dataOffset - header.commentOffset];
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stream.Seek(header.commentOffset, SeekOrigin.Begin);
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stream.Read(cmt, 0, cmt.Length);
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if(cmt.Length > 1) imageInfo.Comments = StringHandlers.CToString(cmt, Encoding.GetEncoding("ibm437"));
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calculatedChk = 0;
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stream.Seek(0, SeekOrigin.Begin);
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int b;
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do
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{
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b = stream.ReadByte();
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if(b >= 0) calculatedChk += (uint)b;
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}
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while(b >= 0);
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DicConsole.DebugWriteLine("SaveDskF plugin", "Calculated checksum = 0x{0:X8}, {1}", calculatedChk,
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calculatedChk == header.checksum);
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imageInfo.Application = "SaveDskF";
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imageInfo.CreationTime = imageFilter.GetCreationTime();
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imageInfo.LastModificationTime = imageFilter.GetLastWriteTime();
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imageInfo.MediaTitle = imageFilter.GetFilename();
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imageInfo.ImageSize = (ulong)(stream.Length - header.dataOffset);
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imageInfo.Sectors = (ulong)(header.sectorsPerTrack * header.heads * header.cylinders);
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imageInfo.SectorSize = header.sectorSize;
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imageInfo.MediaType =
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Geometry.GetMediaType((header.cylinders, (byte)header.heads, header.sectorsPerTrack, header.sectorSize,
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MediaEncoding.MFM, false));
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imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
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DicConsole.VerboseWriteLine("SaveDskF image contains a disk of type {0}", imageInfo.MediaType);
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if(!string.IsNullOrEmpty(imageInfo.Comments))
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DicConsole.VerboseWriteLine("SaveDskF comments: {0}", imageInfo.Comments);
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// TODO: Support compressed images
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if(header.magic == SDF_MAGIC_COMPRESSED)
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throw new
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FeatureSupportedButNotImplementedImageException("Compressed SaveDskF images are not supported.");
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// SaveDskF only ommits ending clusters, leaving no gaps behind, so reading all data we have...
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stream.Seek(header.dataOffset, SeekOrigin.Begin);
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decodedDisk = new byte[imageInfo.Sectors * imageInfo.SectorSize];
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stream.Read(decodedDisk, 0, (int)(stream.Length - header.dataOffset));
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imageInfo.Cylinders = header.cylinders;
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imageInfo.Heads = header.heads;
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imageInfo.SectorsPerTrack = header.sectorsPerTrack;
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return true;
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}
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public bool? VerifySector(ulong sectorAddress)
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{
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return null;
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}
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public bool? VerifySector(ulong sectorAddress, uint track)
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{
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return null;
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}
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public bool? VerifySectors(ulong sectorAddress, uint length, out List<ulong> failingLbas,
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out List<ulong> unknownLbas)
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{
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failingLbas = new List<ulong>();
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unknownLbas = new List<ulong>();
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for(ulong i = sectorAddress; i < sectorAddress + length; i++) unknownLbas.Add(i);
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return null;
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}
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public bool? VerifySectors(ulong sectorAddress, uint length, uint track, out List<ulong> failingLbas,
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out List<ulong> unknownLbas)
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{
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failingLbas = new List<ulong>();
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unknownLbas = new List<ulong>();
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for(ulong i = sectorAddress; i < sectorAddress + length; i++) unknownLbas.Add(i);
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return null;
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}
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public bool? VerifyMediaImage()
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{
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return calculatedChk == header.checksum;
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}
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public byte[] ReadSector(ulong sectorAddress)
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{
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return ReadSectors(sectorAddress, 1);
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}
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public byte[] ReadSectors(ulong sectorAddress, uint length)
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{
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if(sectorAddress > imageInfo.Sectors - 1)
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throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
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if(sectorAddress + length > imageInfo.Sectors)
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throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
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byte[] buffer = new byte[length * imageInfo.SectorSize];
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Array.Copy(decodedDisk, (int)sectorAddress * imageInfo.SectorSize, buffer, 0,
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length * imageInfo.SectorSize);
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return buffer;
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}
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public byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorLong(ulong sectorAddress)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorsLong(ulong sectorAddress, uint length)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadDiskTag(MediaTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public List<Track> GetSessionTracks(Session session)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public List<Track> GetSessionTracks(ushort session)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSector(ulong sectorAddress, uint track)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorLong(ulong sectorAddress, uint track)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct SaveDskFHeader
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{
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/// <summary>0x00 magic number</summary>
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public ushort magic;
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/// <summary>0x02 media type from FAT</summary>
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public ushort mediaType;
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/// <summary>0x04 bytes per sector</summary>
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public ushort sectorSize;
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/// <summary>0x06 sectors per cluster - 1</summary>
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public byte clusterMask;
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/// <summary>0x07 log2(cluster / sector)</summary>
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public byte clusterShift;
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/// <summary>0x08 reserved sectors</summary>
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public ushort reservedSectors;
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/// <summary>0x0A copies of FAT</summary>
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public byte fatCopies;
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/// <summary>0x0B entries in root directory</summary>
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public ushort rootEntries;
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/// <summary>0x0D first cluster</summary>
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public ushort firstCluster;
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/// <summary>0x0F clusters present in image</summary>
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public ushort clustersCopied;
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/// <summary>0x11 sectors per FAT</summary>
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public byte sectorsPerFat;
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/// <summary>0x12 sector number of root directory</summary>
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public ushort rootDirectorySector;
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/// <summary>0x14 sum of all image bytes</summary>
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public uint checksum;
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/// <summary>0x18 cylinders</summary>
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public ushort cylinders;
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/// <summary>0x1A heads</summary>
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public ushort heads;
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/// <summary>0x1C sectors per track</summary>
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public ushort sectorsPerTrack;
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/// <summary>0x1E always zero</summary>
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public uint padding;
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/// <summary>0x22 sectors present in image</summary>
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public ushort sectorsCopied;
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/// <summary>0x24 offset to comment</summary>
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public ushort commentOffset;
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/// <summary>0x26 offset to data</summary>
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public ushort dataOffset;
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}
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}
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} |