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Aaru/Aaru.Images/D88/Read.cs

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// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename : Read.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Reads Quasi88 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 © 2011-2021 Natalia Portillo
// ****************************************************************************/
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Console;
using Aaru.Decoders.Floppy;
using Aaru.Helpers;
namespace Aaru.DiscImages
{
public sealed partial class D88
{
/// <inheritdoc />
public ErrorNumber Open(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
// Even if disk name is supposedly ASCII, I'm pretty sure most emulators allow Shift-JIS to be used :p
var shiftjis = Encoding.GetEncoding("shift_jis");
if(stream.Length < Marshal.SizeOf<Header>())
return ErrorNumber.InvalidArgument;
byte[] hdrB = new byte[Marshal.SizeOf<Header>()];
stream.Read(hdrB, 0, hdrB.Length);
Header hdr = Marshal.ByteArrayToStructureLittleEndian<Header>(hdrB);
AaruConsole.DebugWriteLine("D88 plugin", "d88hdr.name = \"{0}\"",
StringHandlers.CToString(hdr.name, shiftjis));
AaruConsole.DebugWriteLine("D88 plugin", "d88hdr.reserved is empty? = {0}",
hdr.reserved.SequenceEqual(_reservedEmpty));
AaruConsole.DebugWriteLine("D88 plugin", "d88hdr.write_protect = 0x{0:X2}", hdr.write_protect);
AaruConsole.DebugWriteLine("D88 plugin", "d88hdr.disk_type = {0} ({1})", hdr.disk_type,
(byte)hdr.disk_type);
AaruConsole.DebugWriteLine("D88 plugin", "d88hdr.disk_size = {0}", hdr.disk_size);
if(hdr.disk_size != stream.Length)
return ErrorNumber.InvalidArgument;
if(hdr.disk_type != DiskType.D2 &&
hdr.disk_type != DiskType.Dd2 &&
hdr.disk_type != DiskType.Hd2)
return ErrorNumber.InvalidArgument;
if(!hdr.reserved.SequenceEqual(_reservedEmpty))
return ErrorNumber.InvalidArgument;
int trkCounter = 0;
foreach(int t in hdr.track_table)
{
if(t > 0)
trkCounter++;
if(t < 0 ||
t > stream.Length)
return ErrorNumber.InvalidArgument;
}
AaruConsole.DebugWriteLine("D88 plugin", "{0} tracks", trkCounter);
if(trkCounter == 0)
return ErrorNumber.InvalidArgument;
hdrB = new byte[Marshal.SizeOf<SectorHeader>()];
stream.Seek(hdr.track_table[0], SeekOrigin.Begin);
stream.Read(hdrB, 0, hdrB.Length);
SectorHeader sechdr = Marshal.ByteArrayToStructureLittleEndian<SectorHeader>(hdrB);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.c = {0}", sechdr.c);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.h = {0}", sechdr.h);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.r = {0}", sechdr.r);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.n = {0}", sechdr.n);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.spt = {0}", sechdr.spt);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.density = {0}", sechdr.density);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.deleted_mark = {0}", sechdr.deleted_mark);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.status = {0}", sechdr.status);
AaruConsole.DebugWriteLine("D88 plugin", "sechdr.size_of_data = {0}", sechdr.size_of_data);
short spt = sechdr.spt;
IBMSectorSizeCode bps = sechdr.n;
bool allEqual = true;
_sectorsData = new List<byte[]>();
for(int i = 0; i < trkCounter; i++)
{
stream.Seek(hdr.track_table[i], SeekOrigin.Begin);
stream.Read(hdrB, 0, hdrB.Length);
SortedDictionary<byte, byte[]> sectors = new();
sechdr = Marshal.ByteArrayToStructureLittleEndian<SectorHeader>(hdrB);
if(sechdr.spt != spt ||
sechdr.n != bps)
{
AaruConsole.DebugWriteLine("D88 plugin",
"Disk tracks are not same size. spt = {0} (expected {1}), bps = {2} (expected {3}) at track {4} sector {5}",
sechdr.spt, spt, sechdr.n, bps, i, 0);
allEqual = false;
}
short maxJ = sechdr.spt;
byte[] secB;
for(short j = 1; j < maxJ; j++)
{
secB = new byte[sechdr.size_of_data];
stream.Read(secB, 0, secB.Length);
sectors.Add(sechdr.r, secB);
stream.Read(hdrB, 0, hdrB.Length);
sechdr = Marshal.ByteArrayToStructureLittleEndian<SectorHeader>(hdrB);
if(sechdr.spt == spt &&
sechdr.n == bps)
continue;
AaruConsole.DebugWriteLine("D88 plugin",
"Disk tracks are not same size. spt = {0} (expected {1}), bps = {2} (expected {3}) at track {4} sector {5}",
sechdr.spt, spt, sechdr.n, bps, i, j, sechdr.deleted_mark);
allEqual = false;
}
secB = new byte[sechdr.size_of_data];
stream.Read(secB, 0, secB.Length);
sectors.Add(sechdr.r, secB);
foreach(KeyValuePair<byte, byte[]> kvp in sectors)
_sectorsData.Add(kvp.Value);
}
AaruConsole.DebugWriteLine("D88 plugin", "{0} sectors", _sectorsData.Count);
_imageInfo.MediaType = MediaType.Unknown;
if(allEqual)
if(trkCounter == 154 &&
spt == 26 &&
bps == IBMSectorSizeCode.EighthKilo)
_imageInfo.MediaType = MediaType.NEC_8_SD;
else if(bps == IBMSectorSizeCode.QuarterKilo)
switch(trkCounter)
{
case 35 when spt == 16:
_imageInfo.MediaType = MediaType.MetaFloppy_Mod_I;
break;
case 77 when spt == 16:
_imageInfo.MediaType = MediaType.MetaFloppy_Mod_II;
break;
case 80 when spt == 16:
_imageInfo.MediaType = MediaType.NEC_525_SS;
break;
case 154 when spt == 26:
_imageInfo.MediaType = MediaType.NEC_8_DD;
break;
case 160 when spt == 16:
_imageInfo.MediaType = MediaType.NEC_525_DS;
break;
}
else if(trkCounter == 154 &&
spt == 8 &&
bps == IBMSectorSizeCode.Kilo)
_imageInfo.MediaType = MediaType.NEC_525_HD;
else if(bps == IBMSectorSizeCode.HalfKilo)
switch(hdr.track_table.Length)
{
case 40:
{
switch(spt)
{
case 8:
_imageInfo.MediaType = MediaType.DOS_525_SS_DD_8;
break;
case 9:
_imageInfo.MediaType = MediaType.DOS_525_SS_DD_9;
break;
}
}
break;
case 80:
{
switch(spt)
{
case 8:
_imageInfo.MediaType = MediaType.DOS_525_DS_DD_8;
break;
case 9:
_imageInfo.MediaType = MediaType.DOS_525_DS_DD_9;
break;
}
}
break;
case 160:
{
switch(spt)
{
case 15:
_imageInfo.MediaType = MediaType.NEC_35_HD_15;
break;
case 9:
_imageInfo.MediaType = MediaType.DOS_35_DS_DD_9;
break;
case 18:
_imageInfo.MediaType = MediaType.DOS_35_HD;
break;
case 36:
_imageInfo.MediaType = MediaType.DOS_35_ED;
break;
}
}
break;
case 480:
if(spt == 38)
_imageInfo.MediaType = MediaType.NEC_35_TD;
break;
}
AaruConsole.DebugWriteLine("D88 plugin", "MediaType: {0}", _imageInfo.MediaType);
_imageInfo.ImageSize = (ulong)hdr.disk_size;
_imageInfo.CreationTime = imageFilter.CreationTime;
_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
_imageInfo.Sectors = (ulong)_sectorsData.Count;
_imageInfo.Comments = StringHandlers.CToString(hdr.name, shiftjis);
_imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
_imageInfo.SectorSize = (uint)(128 << (int)bps);
switch(_imageInfo.MediaType)
{
case MediaType.NEC_525_SS:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 16;
break;
case MediaType.NEC_8_SD:
case MediaType.NEC_8_DD:
_imageInfo.Cylinders = 77;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 26;
break;
case MediaType.NEC_525_DS:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 16;
break;
case MediaType.NEC_525_HD:
_imageInfo.Cylinders = 77;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 8;
break;
case MediaType.DOS_525_SS_DD_8:
_imageInfo.Cylinders = 40;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 8;
break;
case MediaType.DOS_525_SS_DD_9:
_imageInfo.Cylinders = 40;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 9;
break;
case MediaType.DOS_525_DS_DD_8:
_imageInfo.Cylinders = 40;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 8;
break;
case MediaType.DOS_525_DS_DD_9:
_imageInfo.Cylinders = 40;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 9;
break;
case MediaType.NEC_35_HD_15:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 15;
break;
case MediaType.DOS_35_DS_DD_9:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 9;
break;
case MediaType.DOS_35_HD:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 18;
break;
case MediaType.DOS_35_ED:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 36;
break;
case MediaType.NEC_35_TD:
_imageInfo.Cylinders = 240;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 38;
break;
case MediaType.MetaFloppy_Mod_I:
_imageInfo.Cylinders = 35;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 16;
break;
case MediaType.MetaFloppy_Mod_II:
_imageInfo.Cylinders = 77;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 16;
break;
}
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer) =>
ReadSectors(sectorAddress, 1, out buffer);
/// <inheritdoc />
public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
{
buffer = null;
if(sectorAddress > _imageInfo.Sectors - 1)
return ErrorNumber.OutOfRange;
if(sectorAddress + length > _imageInfo.Sectors)
return ErrorNumber.OutOfRange;
var ms = new MemoryStream();
for(int i = 0; i < length; i++)
ms.Write(_sectorsData[(int)sectorAddress + i], 0, _sectorsData[(int)sectorAddress + i].Length);
buffer = ms.ToArray();
return ErrorNumber.NoError;
}
}
}
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