mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
286 lines
11 KiB
C#
286 lines
11 KiB
C#
// /***************************************************************************
|
|
// Aaru Data Preservation Suite
|
|
// ----------------------------------------------------------------------------
|
|
//
|
|
// Filename : Read.cs
|
|
// Author(s) : Natalia Portillo <claunia@claunia.com>
|
|
//
|
|
// Component : Disk image plugins.
|
|
//
|
|
// --[ Description ] ----------------------------------------------------------
|
|
//
|
|
// Reads Apridisk 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.IO;
|
|
using Aaru.CommonTypes;
|
|
using Aaru.CommonTypes.Enums;
|
|
using Aaru.CommonTypes.Interfaces;
|
|
using Aaru.Helpers;
|
|
using Aaru.Logging;
|
|
|
|
namespace Aaru.Images;
|
|
|
|
public sealed partial class Apridisk
|
|
{
|
|
#region IWritableImage Members
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber Open(IFilter imageFilter)
|
|
{
|
|
Stream stream = imageFilter.GetDataForkStream();
|
|
stream.Seek(0, SeekOrigin.Begin);
|
|
|
|
// Skip signature
|
|
stream.Seek(_signature.Length, SeekOrigin.Begin);
|
|
|
|
int totalCylinders = -1;
|
|
int totalHeads = -1;
|
|
int maxSector = -1;
|
|
int recordSize = Marshal.SizeOf<Record>();
|
|
|
|
// Count cylinders
|
|
while(stream.Position < stream.Length)
|
|
{
|
|
var recB = new byte[recordSize];
|
|
stream.EnsureRead(recB, 0, recordSize);
|
|
|
|
Record record = Marshal.SpanToStructureLittleEndian<Record>(recB);
|
|
|
|
switch(record.type)
|
|
{
|
|
// Deleted record, just skip it
|
|
case RecordType.Deleted:
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Found_deleted_record_at_0, stream.Position);
|
|
|
|
stream.Seek(record.headerSize - recordSize + record.dataSize, SeekOrigin.Current);
|
|
|
|
break;
|
|
case RecordType.Comment:
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Found_comment_record_at_0, stream.Position);
|
|
|
|
stream.Seek(record.headerSize - recordSize, SeekOrigin.Current);
|
|
var commentB = new byte[record.dataSize];
|
|
stream.EnsureRead(commentB, 0, commentB.Length);
|
|
_imageInfo.Comments = StringHandlers.CToString(commentB);
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Comment_0, _imageInfo.Comments);
|
|
|
|
break;
|
|
case RecordType.Creator:
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Found_creator_record_at_0, stream.Position);
|
|
|
|
stream.Seek(record.headerSize - recordSize, SeekOrigin.Current);
|
|
var creatorB = new byte[record.dataSize];
|
|
stream.EnsureRead(creatorB, 0, creatorB.Length);
|
|
_imageInfo.Creator = StringHandlers.CToString(creatorB);
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Creator_0, _imageInfo.Creator);
|
|
|
|
break;
|
|
case RecordType.Sector:
|
|
if(record.compression != CompressType.Compressed && record.compression != CompressType.Uncompresed)
|
|
return ErrorNumber.NotSupported;
|
|
|
|
AaruLogging.Debug(MODULE_NAME,
|
|
record.compression == CompressType.Compressed
|
|
? Localization
|
|
.Found_compressed_sector_record_at_0_for_cylinder_1_head_2_sector_3
|
|
: Localization
|
|
.Found_uncompressed_sector_record_at_0_for_cylinder_1_head_2_sector_3,
|
|
stream.Position,
|
|
record.cylinder,
|
|
record.head,
|
|
record.sector);
|
|
|
|
if(record.cylinder > totalCylinders) totalCylinders = record.cylinder;
|
|
|
|
if(record.head > totalHeads) totalHeads = record.head;
|
|
|
|
if(record.sector > maxSector) maxSector = record.sector;
|
|
|
|
stream.Seek(record.headerSize - recordSize + record.dataSize, SeekOrigin.Current);
|
|
|
|
break;
|
|
default:
|
|
return ErrorNumber.NotSupported;
|
|
}
|
|
}
|
|
|
|
totalCylinders++;
|
|
totalHeads++;
|
|
|
|
if(totalCylinders <= 0 || totalHeads <= 0) return ErrorNumber.NotSupported;
|
|
|
|
_sectorsData = new byte[totalCylinders][][][];
|
|
|
|
// Total sectors per track
|
|
var spts = new uint[totalCylinders][];
|
|
|
|
_imageInfo.Cylinders = (ushort)totalCylinders;
|
|
_imageInfo.Heads = (byte)totalHeads;
|
|
|
|
AaruLogging.Debug(MODULE_NAME,
|
|
Localization.Found_0_cylinders_and_1_heads_with_a_maximum_sector_number_of_2,
|
|
totalCylinders,
|
|
totalHeads,
|
|
maxSector);
|
|
|
|
// Create heads
|
|
for(var i = 0; i < totalCylinders; i++)
|
|
{
|
|
_sectorsData[i] = new byte[totalHeads][][];
|
|
spts[i] = new uint[totalHeads];
|
|
|
|
for(var j = 0; j < totalHeads; j++) _sectorsData[i][j] = new byte[maxSector + 1][];
|
|
}
|
|
|
|
_imageInfo.SectorSize = uint.MaxValue;
|
|
|
|
ulong headerSizes = 0;
|
|
|
|
// Read sectors
|
|
stream.Seek(_signature.Length, SeekOrigin.Begin);
|
|
|
|
while(stream.Position < stream.Length)
|
|
{
|
|
var recB = new byte[recordSize];
|
|
stream.EnsureRead(recB, 0, recordSize);
|
|
|
|
Record record = Marshal.SpanToStructureLittleEndian<Record>(recB);
|
|
|
|
switch(record.type)
|
|
{
|
|
// Not sector record, just skip it
|
|
case RecordType.Deleted:
|
|
case RecordType.Comment:
|
|
case RecordType.Creator:
|
|
stream.Seek(record.headerSize - recordSize + record.dataSize, SeekOrigin.Current);
|
|
headerSizes += record.headerSize + record.dataSize;
|
|
|
|
break;
|
|
case RecordType.Sector:
|
|
stream.Seek(record.headerSize - recordSize, SeekOrigin.Current);
|
|
|
|
var data = new byte[record.dataSize];
|
|
stream.EnsureRead(data, 0, data.Length);
|
|
|
|
spts[record.cylinder][record.head]++;
|
|
uint realLength = record.dataSize;
|
|
|
|
if(record.compression == CompressType.Compressed)
|
|
realLength = Decompress(data, out _sectorsData[record.cylinder][record.head][record.sector]);
|
|
else
|
|
_sectorsData[record.cylinder][record.head][record.sector] = data;
|
|
|
|
if(realLength < _imageInfo.SectorSize) _imageInfo.SectorSize = realLength;
|
|
|
|
headerSizes += record.headerSize + record.dataSize;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Found_a_minimum_of_0_bytes_per_sector, _imageInfo.SectorSize);
|
|
|
|
// Count sectors per track
|
|
uint spt = uint.MaxValue;
|
|
|
|
for(ushort cyl = 0; cyl < _imageInfo.Cylinders; cyl++)
|
|
{
|
|
for(ushort head = 0; head < _imageInfo.Heads; head++)
|
|
if(spts[cyl][head] < spt)
|
|
spt = spts[cyl][head];
|
|
}
|
|
|
|
_imageInfo.SectorsPerTrack = spt;
|
|
|
|
AaruLogging.Debug(MODULE_NAME, Localization.Found_a_minimum_of_0_sectors_per_track, _imageInfo.SectorsPerTrack);
|
|
|
|
_imageInfo.MediaType = Geometry.GetMediaType(((ushort)_imageInfo.Cylinders, (byte)_imageInfo.Heads,
|
|
(ushort)_imageInfo.SectorsPerTrack, 512, MediaEncoding.MFM,
|
|
false));
|
|
|
|
_imageInfo.ImageSize = (ulong)stream.Length - headerSizes;
|
|
_imageInfo.CreationTime = imageFilter.CreationTime;
|
|
_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
|
|
_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
|
|
_imageInfo.Sectors = _imageInfo.Cylinders * _imageInfo.Heads * _imageInfo.SectorsPerTrack;
|
|
_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSector(ulong sectorAddress, bool negative, out byte[] buffer, out SectorStatus sectorStatus)
|
|
{
|
|
buffer = null;
|
|
(ushort cylinder, byte head, byte sector) = LbaToChs(sectorAddress);
|
|
sectorStatus = SectorStatus.NotDumped;
|
|
|
|
if(negative) return ErrorNumber.NotSupported;
|
|
|
|
if(cylinder >= _sectorsData.Length ||
|
|
head >= _sectorsData[cylinder].Length ||
|
|
sector > _sectorsData[cylinder][head].Length)
|
|
return ErrorNumber.SectorNotFound;
|
|
|
|
buffer = _sectorsData[cylinder][head][sector];
|
|
sectorStatus = SectorStatus.Dumped;
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <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 singleSectorStatus);
|
|
|
|
sectorStatus[i] = singleSectorStatus;
|
|
|
|
if(errno != ErrorNumber.NoError) return errno;
|
|
|
|
ms.Write(sector, 0, sector.Length);
|
|
}
|
|
|
|
buffer = ms.ToArray();
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
#endregion
|
|
} |