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Aaru/Aaru.Images/CPCDSK/Read.cs

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C#
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// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename : Read.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Reads CPCEMU disk images.
//
// --[ License ] --------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2025 Natalia Portillo
// ****************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.Checksums;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Decoders.Floppy;
using Aaru.Helpers;
using Aaru.Logging;
namespace Aaru.Images;
public sealed partial class Cpcdsk
{
#region IMediaImage Members
/// <inheritdoc />
public ErrorNumber Open(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
if(stream.Length < 512) return ErrorNumber.InvalidArgument;
var headerB = new byte[256];
stream.EnsureRead(headerB, 0, 256);
int pos;
for(pos = 0; pos < 254; pos++)
if(headerB[pos] == 0x0D && headerB[pos + 1] == 0x0A)
break;
if(pos >= 254) return ErrorNumber.InvalidArgument;
string magic = Encoding.ASCII.GetString(headerB, 0, pos);
stream.Position = pos + 2;
stream.EnsureRead(headerB, 0, 256);
DiskInfo header = Marshal.ByteArrayToStructureLittleEndian<DiskInfo>(headerB);
if(!string.Equals(CPCDSK_ID, magic, StringComparison.InvariantCultureIgnoreCase) &&
!string.Equals(EDSK_ID, magic, StringComparison.InvariantCultureIgnoreCase) &&
!string.Equals(DU54_ID, magic, StringComparison.InvariantCultureIgnoreCase))
return ErrorNumber.InvalidArgument;
_extended = string.Equals(EDSK_ID, magic, StringComparison.InvariantCultureIgnoreCase);
AaruLogging.Debug(MODULE_NAME, Localization.Extended_equals_0, _extended);
AaruLogging.Debug(MODULE_NAME, Localization.magic_equals_0_quoted, magic);
AaruLogging.Debug(MODULE_NAME, "header.magic = \"{0}\"", StringHandlers.CToString(header.magic));
AaruLogging.Debug(MODULE_NAME, "header.creator = \"{0}\"", StringHandlers.CToString(header.creator));
AaruLogging.Debug(MODULE_NAME, "header.tracks = {0}", header.tracks);
AaruLogging.Debug(MODULE_NAME, "header.sides = {0}", header.sides);
if(!_extended)
AaruLogging.Debug(MODULE_NAME, "header.tracksize = {0}", header.tracksize);
else
{
for(var i = 0; i < header.tracks; i++)
{
for(var j = 0; j < header.sides; j++)
{
AaruLogging.Debug(MODULE_NAME,
Localization.Track_0_Side_1_size_equals_2,
i,
j,
header.tracksizeTable[i * header.sides + j] * 256);
}
}
}
ulong currentSector = 0;
_sectors = new Dictionary<ulong, byte[]>();
_addressMarks = new Dictionary<ulong, byte[]>();
ulong readtracks = 0;
var allTracksSameSize = true;
ulong sectorsPerTrack = 0;
// Seek to first track descriptor
stream.Seek(256, SeekOrigin.Begin);
for(var i = 0; i < header.tracks; i++)
{
for(var j = 0; j < header.sides; j++)
{
// Track not stored in image
if(_extended && header.tracksizeTable[i * header.sides + j] == 0) continue;
long trackPos = stream.Position;
var trackB = new byte[256];
stream.EnsureRead(trackB, 0, 256);
TrackInfo trackInfo = Marshal.ByteArrayToStructureLittleEndian<TrackInfo>(trackB);
if(!string.Equals(TRACK_ID,
Encoding.ASCII.GetString(trackInfo.magic),
StringComparison.InvariantCultureIgnoreCase))
{
AaruLogging.Error(Localization.Not_the_expected_track_info);
return ErrorNumber.InvalidArgument;
}
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].magic = \"{0}\"",
StringHandlers.CToString(trackInfo.magic),
i,
j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].bps = {0}", SizeCodeToBytes(trackInfo.bps), i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].dataRate = {0}", trackInfo.dataRate, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].filler = 0x{0:X2}", trackInfo.filler, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].gap3 = 0x{0:X2}", trackInfo.gap3, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].padding = {0}", trackInfo.padding, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].recordingMode = {0}", trackInfo.recordingMode, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].sectors = {0}", trackInfo.sectors, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].side = {0}", trackInfo.side, i, j);
AaruLogging.Debug(MODULE_NAME, "trackInfo[{1}:{2}].track = {0}", trackInfo.track, i, j);
if(trackInfo.sectors != sectorsPerTrack)
{
if(sectorsPerTrack == 0)
sectorsPerTrack = trackInfo.sectors;
else
allTracksSameSize = false;
}
Dictionary<int, byte[]> thisTrackSectors = new();
Dictionary<int, byte[]> thisTrackAddressMarks = new();
for(var k = 1; k <= trackInfo.sectors; k++)
{
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].id = 0x{0:X2}",
trackInfo.sectorsInfo[k - 1].id,
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].len = {0}",
trackInfo.sectorsInfo[k - 1].len,
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].side = {0}",
trackInfo.sectorsInfo[k - 1].side,
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].size = {0}",
SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size),
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].st1 = 0x{0:X2}",
trackInfo.sectorsInfo[k - 1].st1,
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].st2 = 0x{0:X2}",
trackInfo.sectorsInfo[k - 1].st2,
i,
j,
k);
AaruLogging.Debug(MODULE_NAME,
"trackInfo[{1}:{2}].sector[{3}].track = {0}",
trackInfo.sectorsInfo[k - 1].track,
i,
j,
k);
int sectLen = _extended
? trackInfo.sectorsInfo[k - 1].len
: SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size);
var sector = new byte[sectLen];
stream.EnsureRead(sector, 0, sectLen);
if(sectLen < SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size))
{
var temp = new byte[SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size)];
Array.Copy(sector, 0, temp, 0, sector.Length);
sector = temp;
}
else if(sectLen > SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size))
{
var temp = new byte[SizeCodeToBytes(trackInfo.sectorsInfo[k - 1].size)];
Array.Copy(sector, 0, temp, 0, temp.Length);
sector = temp;
}
thisTrackSectors[(trackInfo.sectorsInfo[k - 1].id & 0x3F) - 1] = sector;
var amForCrc = new byte[8];
amForCrc[0] = 0xA1;
amForCrc[1] = 0xA1;
amForCrc[2] = 0xA1;
amForCrc[3] = (byte)IBMIdType.AddressMark;
amForCrc[4] = trackInfo.sectorsInfo[k - 1].track;
amForCrc[5] = trackInfo.sectorsInfo[k - 1].side;
amForCrc[6] = trackInfo.sectorsInfo[k - 1].id;
amForCrc[7] = (byte)trackInfo.sectorsInfo[k - 1].size;
CRC16IbmContext.Data(amForCrc, 8, out byte[] amCrc);
var addressMark = new byte[22];
Array.Copy(amForCrc, 0, addressMark, 12, 8);
Array.Copy(amCrc, 0, addressMark, 20, 2);
thisTrackAddressMarks[(trackInfo.sectorsInfo[k - 1].id & 0x3F) - 1] = addressMark;
}
foreach(KeyValuePair<int, byte[]> s in thisTrackSectors.OrderBy(static k => k.Key))
{
_sectors.Add(currentSector, s.Value);
_addressMarks.Add(currentSector, s.Value);
currentSector++;
if(s.Value.Length > _imageInfo.SectorSize) _imageInfo.SectorSize = (uint)s.Value.Length;
}
stream.Seek(trackPos, SeekOrigin.Begin);
if(_extended)
{
stream.Seek(header.tracksizeTable[i * header.sides + j] * 256, SeekOrigin.Current);
_imageInfo.ImageSize += (ulong)(header.tracksizeTable[i * header.sides + j] * 256) - 256;
}
else
{
stream.Seek(header.tracksize, SeekOrigin.Current);
_imageInfo.ImageSize += (ulong)header.tracksize - 256;
}
readtracks++;
}
}
AaruLogging.Debug(MODULE_NAME, Localization.Read_0_sectors, _sectors.Count);
AaruLogging.Debug(MODULE_NAME, Localization.Read_0_tracks, readtracks);
AaruLogging.Debug(MODULE_NAME, Localization.All_tracks_are_same_size_0, allTracksSameSize);
_imageInfo.Application = StringHandlers.CToString(header.creator);
_imageInfo.CreationTime = imageFilter.CreationTime;
_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
_imageInfo.Sectors = (ulong)_sectors.Count;
_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
_imageInfo.MediaType = MediaType.CompactFloppy;
_imageInfo.ReadableSectorTags.Add(SectorTagType.FloppyAddressMark);
_imageInfo.Cylinders = header.tracks;
_imageInfo.Heads = header.sides;
_imageInfo.SectorsPerTrack = (uint)(_imageInfo.Sectors / (_imageInfo.Cylinders * _imageInfo.Heads));
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadSector(ulong sectorAddress, bool negative, out byte[] buffer, out SectorStatus sectorStatus)
{
buffer = null;
sectorStatus = SectorStatus.NotDumped;
if(negative) return ErrorNumber.NotSupported;
if(_sectors.TryGetValue(sectorAddress, out buffer))
{
sectorStatus = SectorStatus.Dumped;
return ErrorNumber.NoError;
}
sectorStatus = SectorStatus.NotDumped;
return ErrorNumber.SectorNotFound;
}
/// <inheritdoc />
public ErrorNumber ReadSectors(ulong sectorAddress, bool negative, uint length, out byte[] buffer,
out SectorStatus[] sectorStatus)
{
buffer = null;
sectorStatus = null;
if(negative) return ErrorNumber.NotSupported;
if(sectorAddress > _imageInfo.Sectors - 1) return ErrorNumber.OutOfRange;
if(sectorAddress + length > _imageInfo.Sectors) return ErrorNumber.OutOfRange;
var ms = new MemoryStream();
sectorStatus = new SectorStatus[length];
for(uint i = 0; i < length; i++)
{
ErrorNumber errno = ReadSector(sectorAddress + i, false, out byte[] sector, out SectorStatus status);
sectorStatus[i] = status;
if(errno != ErrorNumber.NoError) return errno;
ms.Write(sector, 0, sector.Length);
}
buffer = ms.ToArray();
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadSectorTag(ulong sectorAddress, bool negative, SectorTagType tag, out byte[] buffer)
{
buffer = null;
if(negative) return ErrorNumber.NotSupported;
if(tag != SectorTagType.FloppyAddressMark) return ErrorNumber.NotSupported;
return _addressMarks.TryGetValue(sectorAddress, out buffer) ? ErrorNumber.NoError : ErrorNumber.SectorNotFound;
}
/// <inheritdoc />
public ErrorNumber ReadSectorsTag(ulong sectorAddress, bool negative, uint length, SectorTagType tag,
out byte[] buffer)
{
buffer = null;
if(negative) return ErrorNumber.NotSupported;
if(tag != SectorTagType.FloppyAddressMark) return ErrorNumber.NotSupported;
if(sectorAddress > _imageInfo.Sectors - 1) return ErrorNumber.OutOfRange;
if(sectorAddress + length > _imageInfo.Sectors) return ErrorNumber.OutOfRange;
var ms = new MemoryStream();
for(uint i = 0; i < length; i++)
{
ErrorNumber errno = ReadSector(sectorAddress + i, false, out byte[] addressMark, out _);
if(errno != ErrorNumber.NoError) return errno;
ms.Write(addressMark, 0, addressMark.Length);
}
buffer = ms.ToArray();
return ErrorNumber.NoError;
}
#endregion
}
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