mirror of
https://github.com/aaru-dps/Aaru.git
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Natalia Portillo
828c1e3da0
Introduces constant fields for respective debug module names, replacing the hardcoded ones. This is done to standardize the naming convention, reduce redundancy and potentially avoid any typos or name mismatches across the project. This change makes the code more maintainable and easier to update in case module names need to be changed.
291 lines
10 KiB
C#
291 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 Apple nibbelized 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 © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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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.Decoders.Floppy;
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using Aaru.Helpers;
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namespace Aaru.DiscImages;
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public sealed partial class AppleNib
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{
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/// <inheritdoc />
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public ErrorNumber 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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if(stream.Length < 512)
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return ErrorNumber.InvalidArgument;
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byte[] buffer = new byte[stream.Length];
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stream.EnsureRead(buffer, 0, buffer.Length);
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Decoding_whole_image);
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List<Apple2.RawTrack> tracks = Apple2.MarshalDisk(buffer);
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Got_0_tracks, tracks.Count);
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Dictionary<ulong, Apple2.RawSector> rawSectors = new();
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int spt = 0;
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bool allTracksEqual = true;
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for(int i = 1; i < tracks.Count; i++)
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allTracksEqual &= tracks[i - 1].sectors.Length == tracks[i].sectors.Length;
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if(allTracksEqual)
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spt = tracks[0].sectors.Length;
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bool skewed = spt == 16;
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ulong[] skewing = _proDosSkewing;
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// Detect ProDOS skewed disks
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if(skewed)
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foreach(bool isDos in from sector in tracks[17].sectors
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where sector.addressField.sector.SequenceEqual(new byte[]
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{
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170, 170
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}) select Apple2.DecodeSector(sector) into sector0 where sector0 != null
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select sector0[0x01] == 17 && sector0[0x02] < 16 && sector0[0x27] <= 122 &&
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sector0[0x34] == 35 && sector0[0x35] == 16 && sector0[0x36] == 0 &&
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sector0[0x37] == 1)
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{
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if(isDos)
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skewing = _dosSkewing;
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AaruConsole.DebugWriteLine(MODULE_NAME,
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skewing.SequenceEqual(_dosSkewing) ? Localization.Using_DOS_skewing
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: Localization.Using_ProDOS_skewing);
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}
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for(int i = 0; i < tracks.Count; i++)
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foreach(Apple2.RawSector sector in tracks[i].sectors)
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if(skewed && spt != 0)
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{
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ulong sectorNo = (ulong)((((sector.addressField.sector[0] & 0x55) << 1) |
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(sector.addressField.sector[1] & 0x55)) & 0xFF);
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AaruConsole.DebugWriteLine(MODULE_NAME,
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Localization.Hardware_sector_0_of_track_1_goes_to_logical_sector_2,
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sectorNo, i, skewing[sectorNo] + (ulong)(i * spt));
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rawSectors.Add(skewing[sectorNo] + (ulong)(i * spt), sector);
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_imageInfo.Sectors++;
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}
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else
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{
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rawSectors.Add(_imageInfo.Sectors, sector);
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_imageInfo.Sectors++;
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}
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Got_0_sectors, _imageInfo.Sectors);
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Cooking_sectors);
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_longSectors = new Dictionary<ulong, byte[]>();
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_cookedSectors = new Dictionary<ulong, byte[]>();
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_addressFields = new Dictionary<ulong, byte[]>();
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foreach(KeyValuePair<ulong, Apple2.RawSector> kvp in rawSectors)
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{
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byte[] cooked = Apple2.DecodeSector(kvp.Value);
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byte[] raw = Apple2.MarshalSector(kvp.Value);
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byte[] addr = Apple2.MarshalAddressField(kvp.Value.addressField);
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_longSectors.Add(kvp.Key, raw);
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_cookedSectors.Add(kvp.Key, cooked);
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_addressFields.Add(kvp.Key, addr);
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}
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_imageInfo.ImageSize = (ulong)imageFilter.DataForkLength;
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_imageInfo.CreationTime = imageFilter.CreationTime;
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_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
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_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
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_imageInfo.MediaType = _imageInfo.Sectors switch
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{
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455 => MediaType.Apple32SS,
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560 => MediaType.Apple33SS,
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_ => MediaType.Unknown
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};
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_imageInfo.SectorSize = 256;
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_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
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_imageInfo.ReadableSectorTags.Add(SectorTagType.FloppyAddressMark);
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switch(_imageInfo.MediaType)
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{
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case MediaType.Apple32SS:
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_imageInfo.Cylinders = 35;
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_imageInfo.Heads = 1;
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_imageInfo.SectorsPerTrack = 13;
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break;
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case MediaType.Apple33SS:
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_imageInfo.Cylinders = 35;
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_imageInfo.Heads = 1;
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_imageInfo.SectorsPerTrack = 16;
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break;
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}
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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return _cookedSectors.TryGetValue(sectorAddress, out buffer) ? ErrorNumber.NoError : ErrorNumber.SectorNotFound;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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if(sectorAddress + length > _imageInfo.Sectors)
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return ErrorNumber.OutOfRange;
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var ms = new MemoryStream();
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for(uint i = 0; i < length; i++)
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{
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ErrorNumber errno = ReadSector(sectorAddress + i, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return errno;
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ms.Write(sector, 0, sector.Length);
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}
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buffer = ms.ToArray();
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectorTag(ulong sectorAddress, SectorTagType tag, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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if(tag != SectorTagType.FloppyAddressMark)
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return ErrorNumber.NotSupported;
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return _addressFields.TryGetValue(sectorAddress, out buffer) ? ErrorNumber.NoError : ErrorNumber.NoData;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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if(sectorAddress + length > _imageInfo.Sectors)
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return ErrorNumber.OutOfRange;
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if(tag != SectorTagType.FloppyAddressMark)
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return ErrorNumber.NotSupported;
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var ms = new MemoryStream();
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for(uint i = 0; i < length; i++)
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{
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ErrorNumber errno = ReadSectorTag(sectorAddress + i, tag, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return errno;
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ms.Write(sector, 0, sector.Length);
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}
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buffer = ms.ToArray();
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectorLong(ulong sectorAddress, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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return _longSectors.TryGetValue(sectorAddress, out buffer) ? ErrorNumber.NoError : ErrorNumber.SectorNotFound;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectorsLong(ulong sectorAddress, uint length, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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if(sectorAddress + length > _imageInfo.Sectors)
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return ErrorNumber.OutOfRange;
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var ms = new MemoryStream();
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for(uint i = 0; i < length; i++)
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{
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ErrorNumber errno = ReadSectorLong(sectorAddress + i, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return errno;
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ms.Write(sector, 0, sector.Length);
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}
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buffer = ms.ToArray();
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return ErrorNumber.NoError;
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}
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} |