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Separated floppy decoders by type.

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Natalia Portillo
2015-10-19 02:04:38 +01:00
parent d46a5ab437
commit aab90287f9
12 changed files with 1219 additions and 809 deletions
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204
DiscImageChef.Decoders/Floppy/System34.cs Normal file
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// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename : System34.cs
// Version : 1.0
// Author(s) : Natalia Portillo
//
// Component : IBM System 34 floppy decoder
//
// Revision : $Revision$
// Last change by : $Author$
// Date : $Date$
//
// --[ Description ] ----------------------------------------------------------
//
// Methods and structures for IBM System 34 floppy decoding
//
// --[ 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) 2011-2015 Claunia.com
// ****************************************************************************/
// //$Id$
using System;
namespace DiscImageChef.Decoders.Floppy
{
// Information from:
// National Semiconductor PC87332VLJ datasheet
// SMsC FDC37C78 datasheet
// Intel 82078 datasheet
// Intel 82077AA datasheet
// Toshiba TC8566AF datasheet
// Fujitsu MB8876A datasheet
// ECMA-147
// ECMA-100
/// <summary>
/// Methods and structures for IBM System 34 floppy decoding
/// </summary>
public static class System34
{
/// <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;
}
}
}