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https://github.com/aaru-dps/Aaru.git
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217 lines
10 KiB
C#
217 lines
10 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Read.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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// Reads Sydex CopyQM 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 © 2011-2021 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Aaru.Helpers;
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namespace Aaru.DiscImages
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{
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public sealed partial class CopyQm
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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[133];
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stream.Read(hdr, 0, 133);
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_header = Marshal.ByteArrayToStructureLittleEndian<Header>(hdr);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.magic = 0x{0:X4}", _header.magic);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.mark = 0x{0:X2}", _header.mark);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectorSize = {0}", _header.sectorSize);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectorPerCluster = {0}", _header.sectorPerCluster);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.reservedSectors = {0}", _header.reservedSectors);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.fatCopy = {0}", _header.fatCopy);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.rootEntries = {0}", _header.rootEntries);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectors = {0}", _header.sectors);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.mediaType = 0x{0:X2}", _header.mediaType);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectorsPerFat = {0}", _header.sectorsPerFat);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectorsPerTrack = {0}", _header.sectorsPerTrack);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.heads = {0}", _header.heads);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.hidden = {0}", _header.hidden);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.sectorsBig = {0}", _header.sectorsBig);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.description = {0}", _header.description);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.blind = {0}", _header.blind);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.density = {0}", _header.density);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.imageCylinders = {0}", _header.imageCylinders);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.totalCylinders = {0}", _header.totalCylinders);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.crc = 0x{0:X8}", _header.crc);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.volumeLabel = {0}", _header.volumeLabel);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.time = 0x{0:X4}", _header.time);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.date = 0x{0:X4}", _header.date);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.commentLength = {0}", _header.commentLength);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.secbs = {0}", _header.secbs);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.unknown = 0x{0:X4}", _header.unknown);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.interleave = {0}", _header.interleave);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.skew = {0}", _header.skew);
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AaruConsole.DebugWriteLine("CopyQM plugin", "header.drive = {0}", _header.drive);
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byte[] cmt = new byte[_header.commentLength];
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stream.Read(cmt, 0, _header.commentLength);
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_imageInfo.Comments = StringHandlers.CToString(cmt);
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_decodedImage = new MemoryStream();
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_calculatedDataCrc = 0;
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while(stream.Position + 2 < stream.Length)
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{
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byte[] runLengthBytes = new byte[2];
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if(stream.Read(runLengthBytes, 0, 2) != 2)
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break;
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short runLength = BitConverter.ToInt16(runLengthBytes, 0);
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if(runLength < 0)
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{
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byte repeatedByte = (byte)stream.ReadByte();
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byte[] repeatedArray = new byte[runLength * -1];
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ArrayHelpers.ArrayFill(repeatedArray, repeatedByte);
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for(int i = 0; i < runLength * -1; i++)
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{
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_decodedImage.WriteByte(repeatedByte);
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_calculatedDataCrc = _copyQmCrcTable[(repeatedByte ^ _calculatedDataCrc) & 0x3F] ^
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(_calculatedDataCrc >> 8);
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}
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}
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else if(runLength > 0)
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{
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byte[] nonRepeated = new byte[runLength];
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stream.Read(nonRepeated, 0, runLength);
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_decodedImage.Write(nonRepeated, 0, runLength);
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foreach(byte c in nonRepeated)
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_calculatedDataCrc =
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_copyQmCrcTable[(c ^ _calculatedDataCrc) & 0x3F] ^ (_calculatedDataCrc >> 8);
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}
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}
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// In case there is omitted data
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long sectors = _header.sectorsPerTrack * _header.heads * _header.totalCylinders;
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long fillingLen = (sectors * _header.sectorSize) - _decodedImage.Length;
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if(fillingLen > 0)
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{
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byte[] filling = new byte[fillingLen];
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ArrayHelpers.ArrayFill(filling, (byte)0xF6);
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_decodedImage.Write(filling, 0, filling.Length);
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}
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int sum = 0;
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for(int i = 0; i < hdr.Length - 1; i++)
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sum += hdr[i];
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_headerChecksumOk = ((-1 * sum) & 0xFF) == _header.headerChecksum;
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AaruConsole.DebugWriteLine("CopyQM plugin", "Calculated header checksum = 0x{0:X2}, {1}", (-1 * sum) & 0xFF,
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_headerChecksumOk);
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AaruConsole.DebugWriteLine("CopyQM plugin", "Calculated data CRC = 0x{0:X8}, {1}", _calculatedDataCrc,
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_calculatedDataCrc == _header.crc);
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_imageInfo.Application = "CopyQM";
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_imageInfo.CreationTime = DateHandlers.DosToDateTime(_header.date, _header.time);
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_imageInfo.LastModificationTime = _imageInfo.CreationTime;
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_imageInfo.MediaTitle = _header.volumeLabel;
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_imageInfo.ImageSize = (ulong)(stream.Length - 133 - _header.commentLength);
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_imageInfo.Sectors = (ulong)sectors;
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_imageInfo.SectorSize = _header.sectorSize;
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_imageInfo.MediaType = Geometry.GetMediaType(((ushort)_header.totalCylinders, (byte)_header.heads,
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_header.sectorsPerTrack, (uint)_header.sectorSize,
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MediaEncoding.MFM, false));
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switch(_imageInfo.MediaType)
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{
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case MediaType.NEC_525_HD when _header.drive == COPYQM_35_HD || _header.drive == COPYQM_35_ED:
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_imageInfo.MediaType = MediaType.NEC_35_HD_8;
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break;
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case MediaType.DOS_525_HD when _header.drive == COPYQM_35_HD || _header.drive == COPYQM_35_ED:
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_imageInfo.MediaType = MediaType.NEC_35_HD_15;
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break;
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case MediaType.RX50 when _header.drive == COPYQM_525_DD || _header.drive == COPYQM_525_HD:
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_imageInfo.MediaType = MediaType.ATARI_35_SS_DD;
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break;
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}
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_imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
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_decodedDisk = _decodedImage.ToArray();
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_decodedImage.Close();
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AaruConsole.VerboseWriteLine("CopyQM image contains a disk of type {0}", _imageInfo.MediaType);
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if(!string.IsNullOrEmpty(_imageInfo.Comments))
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AaruConsole.VerboseWriteLine("CopyQM comments: {0}", _imageInfo.Comments);
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_imageInfo.Heads = _header.heads;
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_imageInfo.Cylinders = _header.totalCylinders;
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_imageInfo.SectorsPerTrack = _header.sectorsPerTrack;
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return true;
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}
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public byte[] ReadSector(ulong sectorAddress) => ReadSectors(sectorAddress, 1);
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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 bool? VerifyMediaImage() => _calculatedDataCrc == _header.crc && _headerChecksumOk;
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}
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} |