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Aaru.Server/DiscImageChef.Decoders/Floppy.cs

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/***************************************************************************
The Disc Image Chef
----------------------------------------------------------------------------
Filename : BD.cs
Version : 1.0
Author(s) : Natalia Portillo
Component : Decoders.
Revision : $Revision$
Last change by : $Author$
Date : $Date$
--[ Description ] ----------------------------------------------------------
Decodes DVD structures.
--[ License ] --------------------------------------------------------------
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
----------------------------------------------------------------------------
Copyright (C) 2011-2014 Claunia.com
****************************************************************************/
//$Id$
using System;
using System.Runtime.InteropServices;
namespace DiscImageChef.Decoders
{
// Information from:
// National Semiconductor PC87332VLJ datasheet
// SMsC FDC37C78 datasheet
// Intel 82078 datasheet
// Intel 82077AA datasheet
// Toshiba TC8566AF datasheet
// Fujitsu MB8876A datasheet
// Inside Macintosh, Volume II, ISBN 0-201-17732-3
// ECMA-147
// ECMA-100
public static class Floppy
{
#region Public enumerations
/// <summary>
/// In-sector code for sector size
/// </summary>
public enum IBMSectorSizeCode : byte
{
/// <summary>
/// 128 bytes/sector
/// </summary>
EighthKilo = 0,
/// <summary>
/// 256 bytes/sector
/// </summary>
QuarterKilo = 1,
/// <summary>
/// 512 bytes/sector
/// </summary>
HalfKilo = 2,
/// <summary>
/// 1024 bytes/sector
/// </summary>
Kilo = 3,
/// <summary>
/// 2048 bytes/sector
/// </summary>
TwiceKilo = 4,
/// <summary>
/// 4096 bytes/sector
/// </summary>
FriceKilo = 5,
/// <summary>
/// 8192 bytes/sector
/// </summary>
TwiceFriceKilo = 6,
/// <summary>
/// 16384 bytes/sector
/// </summary>
FricelyFriceKilo = 7
}
public enum IBMIdType : byte
{
IndexMark = 0xFC,
AddressMark = 0xFE,
DataMark = 0xFB,
DeletedDataMark = 0xF8
}
public enum AppleEncodedFormat : byte
{
/// <summary>
/// Disk is an Apple II 3.5" disk
/// </summary>
AppleII = 0x96,
/// <summary>
/// Disk is an Apple Lisa 3.5" disk
/// </summary>
Lisa = 0x97,
/// <summary>
/// Disk is an Apple Macintosh single-sided 3.5" disk
/// </summary>
MacSingleSide = 0x9A,
/// <summary>
/// Disk is an Apple Macintosh double-sided 3.5" disk
/// </summary>
MacDoubleSide = 0xD9
}
#endregion Public enumerations
#region Public structures
#region IBM System 3740 floppy
/// <summary>
/// Track format for IBM System 3740 floppy
/// </summary>
public struct IBMFMTrack
{
/// <summary>
/// Start of track
/// </summary>
public IBMFMTrackPreamble trackStart;
/// <summary>
/// Track sectors
/// </summary>
public IBMFMSector[] sectors;
/// <summary>
/// Undefined size
/// </summary>
public byte[] gap;
}
/// <summary>
/// Start of IBM PC FM floppy track
/// </summary>
public struct IBMFMTrackPreamble
{
/// <summary>
/// Gap from index pulse, 80 bytes set to 0xFF
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 40)]
public byte[] gap;
/// <summary>
/// 6 bytes set to 0x00
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
public byte[] zero;
/// <summary>
/// Set to <see cref="IBMIdType.IndexMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// Gap until first sector, 26 bytes to 0xFF
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 26)]
public byte[] gap1;
}
/// <summary>
/// Raw demodulated format for IBM System 3740 floppies
/// </summary>
public struct IBMFMSector
{
/// <summary>
/// Sector address mark
/// </summary>
public IBMFMSectorAddressMark addressMark;
/// <summary>
/// 11 bytes set to 0xFF
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
public byte[] innerGap;
/// <summary>
/// Sector data block
/// </summary>
public IBMFMSectorAddressMark dataBlock;
/// <summary>
/// Variable bytes set to 0xFF
/// </summary>
public byte[] outerGap;
}
/// <summary>
/// Sector address mark for IBM System 3740 floppies, contains sync word
/// </summary>
public struct IBMFMSectorAddressMark
{
/// <summary>
/// 6 bytes set to 0
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
public byte[] zero;
/// <summary>
/// Set to <see cref="IBMIdType.AddressMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// Track number
/// </summary>
public byte track;
/// <summary>
/// Side number
/// </summary>
public byte side;
/// <summary>
/// Sector number
/// </summary>
public byte sector;
/// <summary>
/// <see cref="IBMSectorSizeCode"/>
/// </summary>
public IBMSectorSizeCode sectorSize;
/// <summary>
/// CRC16 from <see cref="type"/> to end of <see cref="sectorSize"/>
/// </summary>
public UInt16 crc;
}
/// <summary>
/// Sector data block for IBM System 3740 floppies
/// </summary>
public struct IBMFMSectorDataBlock
{
/// <summary>
/// 12 bytes set to 0
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
public byte[] zero;
/// <summary>
/// Set to <see cref="IBMIdType.DataMark"/> or to <see cref="IBMIdType.DeletedDataMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// User data
/// </summary>
public byte[] data;
/// <summary>
/// CRC16 from <see cref="type"/> to end of <see cref="data"/>
/// </summary>
public UInt16 crc;
}
#endregion IBM System 3740 floppy
#region IBM System 34 floppy
/// <summary>
/// Track format for IBM System 34 floppy
/// Used by IBM PC, Apple Macintosh (high-density only), and a lot others
/// </summary>
public struct IBMMFMTrack
{
/// <summary>
/// Start of track
/// </summary>
public IBMMFMTrackPreamble trackStart;
/// <summary>
/// Track sectors
/// </summary>
public IBMMFMSector[] sectors;
/// <summary>
/// Undefined size
/// </summary>
public byte[] gap;
}
/// <summary>
/// Start of IBM PC MFM floppy track
/// Used by IBM PC, Apple Macintosh (high-density only), and a lot others
/// </summary>
public struct IBMMFMTrackPreamble
{
/// <summary>
/// Gap from index pulse, 80 bytes set to 0x4E
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 80)]
public byte[] gap;
/// <summary>
/// 12 bytes set to 0x00
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
public byte[] zero;
/// <summary>
/// 3 bytes set to 0xC2
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] ctwo;
/// <summary>
/// Set to <see cref="IBMIdType.IndexMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// Gap until first sector, 50 bytes to 0x4E
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public byte[] gap1;
}
/// <summary>
/// Raw demodulated format for IBM System 34 floppies
/// </summary>
public struct IBMMFMSector
{
/// <summary>
/// Sector address mark
/// </summary>
public IBMMFMSectorAddressMark addressMark;
/// <summary>
/// 22 bytes set to 0x4E, set to 0x22 on Commodore 1581
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 22)]
public byte[] innerGap;
/// <summary>
/// Sector data block
/// </summary>
public IBMMFMSectorAddressMark dataBlock;
/// <summary>
/// Variable bytes set to 0x4E, ECMA defines 54
/// </summary>
public byte[] outerGap;
}
/// <summary>
/// Sector address mark for IBM System 34 floppies, contains sync word
/// </summary>
public struct IBMMFMSectorAddressMark
{
/// <summary>
/// 12 bytes set to 0
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
public byte[] zero;
/// <summary>
/// 3 bytes set to 0xA1
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] aone;
/// <summary>
/// Set to <see cref="IBMIdType.AddressMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// Track number
/// </summary>
public byte track;
/// <summary>
/// Side number
/// </summary>
public byte side;
/// <summary>
/// Sector number
/// </summary>
public byte sector;
/// <summary>
/// <see cref="IBMSectorSizeCode"/>
/// </summary>
public IBMSectorSizeCode sectorSize;
/// <summary>
/// CRC16 from <see cref="IBMMFMSectorAddressMark.aone"/> to end of <see cref="sectorSize"/>
/// </summary>
public UInt16 crc;
}
/// <summary>
/// Sector data block for IBM System 34 floppies
/// </summary>
public struct IBMMFMSectorDataBlock
{
/// <summary>
/// 12 bytes set to 0
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
public byte[] zero;
/// <summary>
/// 3 bytes set to 0xA1
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] aone;
/// <summary>
/// Set to <see cref="IBMIdType.DataMark"/> or to <see cref="IBMIdType.DeletedDataMark"/>
/// </summary>
public IBMIdType type;
/// <summary>
/// User data
/// </summary>
public byte[] data;
/// <summary>
/// CRC16 from <see cref="aone"/> to end of <see cref="data"/>
/// </summary>
public UInt16 crc;
}
#endregion IBM System 34 floppy
#region Perpendicular MFM floppy
/// <summary>
/// Perpendicular floppy track
/// </summary>
public struct PerpendicularFloppyTrack
{
/// <summary>
/// Start of track
/// </summary>
public IBMMFMTrackPreamble trackStart;
/// <summary>
/// Track sectors
/// </summary>
public PerpendicularFloppySector[] sectors;
/// <summary>
/// Undefined size
/// </summary>
public byte[] gap;
}
/// <summary>
/// Raw demodulated format for perpendicular floppies
/// </summary>
public struct PerpendicularFloppySector
{
/// <summary>
/// Sector address mark
/// </summary>
public IBMMFMSectorAddressMark addressMark;
/// <summary>
/// 41 bytes set to 0x4E
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 41)]
public byte[] innerGap;
/// <summary>
/// Sector data block
/// </summary>
public IBMMFMSectorDataBlock dataBlock;
/// <summary>
/// Variable-sized inter-sector gap, ECMA defines 83 bytes
/// </summary>
public byte[] outerGap;
}
#endregion Perpendicular MFM floppy
#region ISO floppy
/// <summary>
/// ISO floppy track, also used by Atari ST and others
/// </summary>
public struct ISOFloppyTrack
{
/// <summary>
/// Start of track, 32 bytes set to 0x4E
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
public byte[] innerGap;
/// <summary>
/// Track sectors
/// </summary>
public IBMMFMSector[] sectors;
/// <summary>
/// Undefined size
/// </summary>
public byte[] gap;
}
#endregion ISO floppy
#region Apple ][ GCR floppy
/// <summary>
/// GCR-encoded Apple ][ GCR floppy track
/// </summary>
public struct AppleOldGCRRawSectorRawTrack
{
/// <summary>
/// Track preamble, set to self-sync 0xFF, between 40 and 95 bytes
/// </summary>
public byte[] gap;
public AppleOldGCRRawSector[] sectors;
}
/// <summary>
/// GCR-encoded Apple ][ GCR floppy sector
/// </summary>
public struct AppleOldGCRRawSector
{
/// <summary>
/// Address field
/// </summary>
public AppleOldGCRRawAddressField addressField;
/// <summary>
/// Track preamble, set to self-sync 0xFF, between 5 and 10 bytes
/// </summary>
public byte[] innerGap;
/// <summary>
/// Data field
/// </summary>
public AppleOldGCRRawDataField dataField;
/// <summary>
/// Track preamble, set to self-sync 0xFF, between 14 and 24 bytes
/// </summary>
public byte[] gap;
}
/// <summary>
/// GCR-encoded Apple ][ GCR floppy sector address field
/// </summary>
public struct AppleOldGCRRawAddressField
{
/// <summary>
/// Always 0xD5, 0xAA, 0x96
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] prologue;
/// <summary>
/// Volume number encoded as:
/// volume[0] = (decodedVolume >> 1) | 0xAA
/// volume[1] = decodedVolume | 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] volume;
/// <summary>
/// Track number encoded as:
/// track[0] = (decodedTrack >> 1) | 0xAA
/// track[1] = decodedTrack | 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] track;
/// <summary>
/// Sector number encoded as:
/// sector[0] = (decodedSector >> 1) | 0xAA
/// sector[1] = decodedSector | 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] sector;
/// <summary>
/// decodedChecksum = decodedVolume ^ decodedTrack ^ decodedSector
/// checksum[0] = (decodedChecksum >> 1) | 0xAA
/// checksum[1] = decodedChecksum | 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] checksum;
/// <summary>
/// Always 0xDE, 0xAA, 0xEB
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] epilogue;
}
/// <summary>
/// GCR-encoded Apple ][ GCR floppy sector data field
/// </summary>
public struct AppleOldGCRRawDataField
{
/// <summary>
/// Always 0xD5, 0xAA, 0xAD
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] prologue;
/// <summary>
/// Encoded data bytes.
/// 410 bytes for 5to3 (aka DOS 3.2) format
/// 342 bytes for 6to2 (aka DOS 3.3) format
/// </summary>
public byte[] data;
public byte checksum;
/// <summary>
/// Always 0xDE, 0xAA, 0xEB
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] epilogue;
}
#endregion Apple ][ GCR floppy
#region Apple Sony GCR floppy
/// <summary>
/// GCR-encoded Apple Sony GCR floppy track
/// </summary>
public struct AppleSonyGCRRawSectorRawTrack
{
/// <summary>
/// Track preamble, set to self-sync 0xFF, 36 bytes
/// </summary>
public byte[] gap;
public AppleOldGCRRawSector[] sectors;
}
/// <summary>
/// GCR-encoded Apple Sony GCR floppy sector
/// </summary>
public struct AppleSonyGCRRawSector
{
/// <summary>
/// Address field
/// </summary>
public AppleSonyGCRRawAddressField addressField;
/// <summary>
/// Track preamble, set to self-sync 0xFF, 6 bytes
/// </summary>
public byte[] innerGap;
/// <summary>
/// Data field
/// </summary>
public AppleSonyGCRRawDataField dataField;
/// <summary>
/// Track preamble, set to self-sync 0xFF, unknown size
/// </summary>
public byte[] gap;
}
/// <summary>
/// GCR-encoded Apple Sony GCR floppy sector address field
/// </summary>
public struct AppleSonyGCRRawAddressField
{
/// <summary>
/// Always 0xD5, 0xAA, 0x96
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] prologue;
/// <summary>
/// Encoded (decodedTrack & 0x3F)
/// </summary>
public byte track;
/// <summary>
/// Encoded sector number
/// </summary>
public byte sector;
/// <summary>
/// Encoded side number
/// </summary>
public byte side;
/// <summary>
/// Disk format
/// </summary>
public AppleEncodedFormat format;
/// <summary>
/// Checksum
/// </summary>
public byte checksum;
/// <summary>
/// Always 0xDE, 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] epilogue;
}
/// <summary>
/// GCR-encoded Apple ][ GCR floppy sector data field
/// </summary>
public struct AppleSonyGCRRawDataField
{
/// <summary>
/// Always 0xD5, 0xAA, 0xAD
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] prologue;
/// <summary>
/// Spare, usually <see cref="AppleSonyGCRRawAddressField.sector"/>
/// </summary>
public byte spare;
/// <summary>
/// Encoded data bytes.
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 698)]
public byte[] data;
/// <summary>
/// Checksum
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] checksum;
/// <summary>
/// Always 0xDE, 0xAA
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] epilogue;
}
#endregion Apple Sony GCR floppy
#region Commodore GCR decoded
/// <summary>
/// Decoded Commodore GCR sector header
/// </summary>
public struct CommodoreSectorHeader
{
/// <summary>
/// Always 0x08
/// </summary>
public byte id;
/// <summary>
/// XOR of following fields
/// </summary>
public byte checksum;
/// <summary>
/// Sector number
/// </summary>
public byte sector;
/// <summary>
/// Track number
/// </summary>
public byte track;
/// <summary>
/// Format ID, unknown meaning
/// </summary>
public UInt16 format;
/// <summary>
/// Filled with 0x0F
/// </summary>
public UInt16 fill;
}
/// <summary>
/// Decoded Commodore GCR sector data
/// </summary>
public struct CommodoreSectorData
{
/// <summary>
/// Always 0x07
/// </summary>
public byte id;
/// <summary>
/// User data
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
public byte data;
/// <summary>
/// XOR of <see cref="data"/>
/// </summary>
public byte checksum;
/// <summary>
/// Filled with 0x0F
/// </summary>
public UInt16 fill;
}
#endregion Commodore GCR decoded
#region Commodore Amiga
public struct CommodoreAmigaSector
{
/// <summary>
/// Set to 0x00
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] zero;
/// <summary>
/// Set to 0xA1
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] sync;
/// <summary>
/// Set to 0xFF
/// </summary>
public byte amiga;
/// <summary>
/// Track number
/// </summary>
public byte track;
/// <summary>
/// Sector number
/// </summary>
public byte sector;
/// <summary>
/// Remaining sectors til end of writing
/// </summary>
public byte remaining;
/// <summary>
/// OS dependent tag
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public byte[] label;
/// <summary>
/// Checksum from <see cref="amiga"/> to <see cref="label"/>
/// </summary>
public UInt32 headerChecksum;
/// <summary>
/// Checksum from <see cref="data"/>
/// </summary>
public UInt32 dataChecksum;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)]
public byte[] data;
}
#endregion Commodore Amiga
#endregion Public structures
}
}
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