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206 lines
10 KiB
C#
206 lines
10 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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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 © 2011-2019 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Enums;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Console;
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using DiscImageChef.Helpers;
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namespace DiscImageChef.DiscImages
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{
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public 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<CopyQmHeader>(hdr);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.magic = 0x{0:X4}", header.magic);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.mark = 0x{0:X2}", header.mark);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectorSize = {0}", header.sectorSize);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectorPerCluster = {0}", header.sectorPerCluster);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.reservedSectors = {0}", header.reservedSectors);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.fatCopy = {0}", header.fatCopy);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.rootEntries = {0}", header.rootEntries);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectors = {0}", header.sectors);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.mediaType = 0x{0:X2}", header.mediaType);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectorsPerFat = {0}", header.sectorsPerFat);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectorsPerTrack = {0}", header.sectorsPerTrack);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.heads = {0}", header.heads);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.hidden = {0}", header.hidden);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.sectorsBig = {0}", header.sectorsBig);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.description = {0}", header.description);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.blind = {0}", header.blind);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.density = {0}", header.density);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.imageCylinders = {0}", header.imageCylinders);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.totalCylinders = {0}", header.totalCylinders);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.crc = 0x{0:X8}", header.crc);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.volumeLabel = {0}", header.volumeLabel);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.time = 0x{0:X4}", header.time);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.date = 0x{0:X4}", header.date);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.commentLength = {0}", header.commentLength);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.secbs = {0}", header.secbs);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.unknown = 0x{0:X4}", header.unknown);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.interleave = {0}", header.interleave);
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DicConsole.DebugWriteLine("CopyQM plugin", "header.skew = {0}", header.skew);
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DicConsole.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) 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 = 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++) sum += hdr[i];
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headerChecksumOk = ((-1 * sum) & 0xFF) == header.headerChecksum;
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DicConsole.DebugWriteLine("CopyQM plugin", "Calculated header checksum = 0x{0:X2}, {1}", (-1 * sum) & 0xFF,
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headerChecksumOk);
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DicConsole.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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DicConsole.VerboseWriteLine("CopyQM image contains a disk of type {0}", imageInfo.MediaType);
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if(!string.IsNullOrEmpty(imageInfo.Comments))
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DicConsole.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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} |