Separated floppy decoders by type.

2025-12-16 19:24:25 +00:00 · 2015-10-19 02:04:38 +01:00
parent d46a5ab437
commit aab90287f9
12 changed files with 1219 additions and 809 deletions
--- a/DiscImageChef.Decoders/Floppy/Apple2.cs
+++ b/DiscImageChef.Decoders/Floppy/Apple2.cs
@@ -0,0 +1,152 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Apple2.cs
+// Version        : 1.0
+// Author(s)      : Natalia Portillo
+//
+// Component      : Apple ][ floppy decoder
+//
+// Revision       : $Revision$
+// Last change by : $Author$
+// Date           : $Date$
+//
+// --[ Description ] ----------------------------------------------------------
+//
+// Methods and structures for Apple ][ 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
+{
+    /// <summary>
+    /// Methods and structures for Apple ][ floppy decoding
+    /// </summary>
+    public static class Apple2
+    {
+        /// <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;
+        }
+    }
+}
+