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Aaru/Aaru.Images/TeleDisk/Helpers.cs
Natalia Portillo 828c1e3da0 [Aaru.Images] Introduced constants for module names 
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.
2023-10-03 18:50:20 +01:00

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C#
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// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename : Helpers.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Contains helpers for Sydex TeleDisk 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 © 2011-2023 Natalia Portillo
// ****************************************************************************/
using System;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.Console;
using Aaru.Helpers;
namespace Aaru.DiscImages;
public sealed partial class TeleDisk
{
(ushort cylinder, byte head, byte sector) LbaToChs(ulong lba)
{
ushort cylinder = (ushort)(lba / (_imageInfo.Heads * _imageInfo.SectorsPerTrack));
byte head = (byte)(lba / _imageInfo.SectorsPerTrack % _imageInfo.Heads);
byte sector = (byte)((lba % _imageInfo.SectorsPerTrack) + 1);
return (cylinder, head, sector);
}
static ushort TeleDiskCrc(ushort crc, byte[] buffer)
{
int counter = 0;
while(counter < buffer.Length)
{
crc ^= (ushort)((buffer[counter] & 0xFF) << 8);
for(int i = 0; i < 8; i++)
if((crc & 0x8000) > 0)
crc = (ushort)((crc << 1) ^ TELE_DISK_CRC_POLY);
else
crc = (ushort)(crc << 1);
counter++;
}
return crc;
}
static ErrorNumber DecodeTeleDiskData(byte sectorSize, byte encodingType, byte[] encodedData,
out byte[] decodedData)
{
decodedData = null;
switch(sectorSize)
{
case SECTOR_SIZE_128:
decodedData = new byte[128];
break;
case SECTOR_SIZE_256:
decodedData = new byte[256];
break;
case SECTOR_SIZE_512:
decodedData = new byte[512];
break;
case SECTOR_SIZE_1K:
decodedData = new byte[1024];
break;
case SECTOR_SIZE_2K:
decodedData = new byte[2048];
break;
case SECTOR_SIZE_4K:
decodedData = new byte[4096];
break;
case SECTOR_SIZE_8K:
decodedData = new byte[8192];
break;
default:
AaruConsole.ErrorWriteLine(string.Format(Localization.Sector_size_0_is_incorrect, sectorSize));
return ErrorNumber.InvalidArgument;
}
switch(encodingType)
{
case DATA_BLOCK_COPY:
Array.Copy(encodedData, decodedData, decodedData.Length);
break;
case DATA_BLOCK_PATTERN:
{
int ins = 0;
int outs = 0;
while(ins < encodedData.Length)
{
byte[] repeatValue = new byte[2];
ushort repeatNumber = BitConverter.ToUInt16(encodedData, ins);
Array.Copy(encodedData, ins + 2, repeatValue, 0, 2);
byte[] decodedPiece = new byte[repeatNumber * 2];
ArrayHelpers.ArrayFill(decodedPiece, repeatValue);
Array.Copy(decodedPiece, 0, decodedData, outs, decodedPiece.Length);
ins += 4;
outs += decodedPiece.Length;
}
AaruConsole.DebugWriteLine(MODULE_NAME,
Localization.Block_pattern_decoder_Input_data_size_0_bytes,
encodedData.Length);
AaruConsole.DebugWriteLine(MODULE_NAME,
Localization.Block_pattern_decoder_Processed_input_0_bytes, ins);
AaruConsole.DebugWriteLine(MODULE_NAME,
Localization.Block_pattern_decoder_Output_data_size_0_bytes,
decodedData.Length);
AaruConsole.DebugWriteLine(MODULE_NAME,
Localization.Block_pattern_decoder_Processed_Output_0_bytes, outs);
break;
}
case DATA_BLOCK_RLE:
{
int ins = 0;
int outs = 0;
while(ins < encodedData.Length)
{
byte length;
byte encoding = encodedData[ins];
if(encoding == 0x00)
{
length = encodedData[ins + 1];
Array.Copy(encodedData, ins + 2, decodedData, outs, length);
ins += 2 + length;
outs += length;
}
else
{
length = (byte)(encoding * 2);
byte run = encodedData[ins + 1];
byte[] part = new byte[length];
Array.Copy(encodedData, ins + 2, part, 0, length);
byte[] piece = new byte[length * run];
ArrayHelpers.ArrayFill(piece, part);
Array.Copy(piece, 0, decodedData, outs, piece.Length);
ins += 2 + length;
outs += piece.Length;
}
}
AaruConsole.DebugWriteLine(MODULE_NAME, Localization.RLE_decoder_Input_data_size_0_bytes,
encodedData.Length);
AaruConsole.DebugWriteLine(MODULE_NAME, Localization.RLE_decoder_Processed_input_0_bytes, ins);
AaruConsole.DebugWriteLine(MODULE_NAME, Localization.RLE_decoder_Output_data_size_0_bytes,
decodedData.Length);
AaruConsole.DebugWriteLine(MODULE_NAME, Localization.RLE_decoder_Processed_Output_0_bytes, outs);
break;
}
default:
AaruConsole.ErrorWriteLine(string.Format(Localization.Data_encoding_0_is_incorrect, encodingType));
return ErrorNumber.InvalidArgument;
}
return ErrorNumber.NoError;
}
MediaType DecodeTeleDiskDiskType()
{
switch(_header.DriveType)
{
case DRIVE_TYPE_525_DD:
case DRIVE_TYPE_525_HD_DD_DISK:
case DRIVE_TYPE_525_HD:
{
switch(_totalDiskSize)
{
case 143360: return _imageInfo.SectorSize == 256 ? MediaType.MetaFloppy_Mod_I : MediaType.Unknown;
case 163840:
{
// Acorn disk uses 256 bytes/sector
return _imageInfo.SectorSize == 256 ? MediaType.ACORN_525_SS_DD_40 : MediaType.DOS_525_SS_DD_8;
// DOS disks use 512 bytes/sector
}
case 184320:
{
// Atari disk uses 256 bytes/sector
return _imageInfo.SectorSize == 256 ? MediaType.ATARI_525_DD : MediaType.DOS_525_SS_DD_9;
// DOS disks use 512 bytes/sector
}
case 315392: return _imageInfo.SectorSize == 256 ? MediaType.MetaFloppy_Mod_II : MediaType.Unknown;
case 327680:
{
// Acorn disk uses 256 bytes/sector
return _imageInfo.SectorSize == 256 ? MediaType.ACORN_525_SS_DD_80 : MediaType.DOS_525_DS_DD_8;
// DOS disks use 512 bytes/sector
}
case 368640: return MediaType.DOS_525_DS_DD_9;
case 1228800: return MediaType.DOS_525_HD;
case 102400: return MediaType.ACORN_525_SS_SD_40;
case 204800: return MediaType.ACORN_525_SS_SD_80;
case 655360: return MediaType.ACORN_525_DS_DD;
case 92160: return MediaType.ATARI_525_SD;
case 133120: return MediaType.ATARI_525_ED;
case 1310720: return MediaType.NEC_525_HD;
case 1261568: return MediaType.SHARP_525;
case 839680: return MediaType.FDFORMAT_525_DD;
case 1304320: return MediaType.ECMA_99_8;
case 1223424: return MediaType.ECMA_99_15;
case 1061632: return MediaType.ECMA_99_26;
case 80384: return MediaType.ECMA_66;
case 325632: return MediaType.ECMA_70;
case 653312: return MediaType.ECMA_78;
case 737280: return MediaType.ECMA_78_2;
default:
{
AaruConsole.DebugWriteLine(MODULE_NAME, "Unknown 5,25\" disk with {0} bytes",
_totalDiskSize);
return MediaType.Unknown;
}
}
}
case DRIVE_TYPE_35_DD:
case DRIVE_TYPE_35_ED:
case DRIVE_TYPE_35_HD:
{
switch(_totalDiskSize)
{
case 322560: return MediaType.Apricot_35;
case 327680: return MediaType.DOS_35_SS_DD_8;
case 368640: return MediaType.DOS_35_SS_DD_9;
case 655360: return MediaType.DOS_35_DS_DD_8;
case 737280: return MediaType.DOS_35_DS_DD_9;
case 1474560: return MediaType.DOS_35_HD;
case 2949120: return MediaType.DOS_35_ED;
case 1720320: return MediaType.DMF;
case 1763328: return MediaType.DMF_82;
case 1884160: // Irreal size, seen as BIOS with TSR, 23 sectors/track
case 1860608: // Real data size, sum of all sectors
return MediaType.XDF_35;
case 819200: return MediaType.CBM_35_DD;
case 901120: return MediaType.CBM_AMIGA_35_DD;
case 1802240: return MediaType.CBM_AMIGA_35_HD;
case 1310720: return MediaType.NEC_35_HD_8;
case 1228800: return MediaType.NEC_35_HD_15;
case 1261568: return MediaType.SHARP_35;
default:
{
AaruConsole.DebugWriteLine(MODULE_NAME, "Unknown 3,5\" disk with {0} bytes",
_totalDiskSize);
return MediaType.Unknown;
}
}
}
case DRIVE_TYPE_8_INCH:
{
switch(_totalDiskSize)
{
case 81664: return MediaType.IBM23FD;
case 242944: return MediaType.IBM33FD_128;
case 287488: return MediaType.IBM33FD_256;
case 306432: return MediaType.IBM33FD_512;
case 499200: return MediaType.IBM43FD_128;
case 574976: return MediaType.IBM43FD_256;
case 995072: return MediaType.IBM53FD_256;
case 1146624: return MediaType.IBM53FD_512;
case 1222400: return MediaType.IBM53FD_1024;
case 256256:
// Same size, with same disk geometry, for DEC RX01, NEC and ECMA, return ECMA
return MediaType.ECMA_54;
case 512512:
{
// DEC disk uses 256 bytes/sector
return _imageInfo.SectorSize == 256 ? MediaType.RX02 : MediaType.ECMA_59;
// ECMA disks use 128 bytes/sector
}
case 1261568: return MediaType.NEC_8_DD;
case 1255168: return MediaType.ECMA_69_8;
case 1177344: return MediaType.ECMA_69_15;
case 1021696: return MediaType.ECMA_69_26;
default:
{
AaruConsole.DebugWriteLine(MODULE_NAME, "Unknown 8\" disk with {0} bytes",
_totalDiskSize);
return MediaType.Unknown;
}
}
}
default:
{
AaruConsole.DebugWriteLine(MODULE_NAME, "Unknown drive type {1} with {0} bytes", _totalDiskSize,
_header.DriveType);
return MediaType.Unknown;
}
}
}
}
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