Move common Apple boot block information and structs to its own class.

2025-12-16 19:24:25 +00:00 · 2020-02-19 00:12:15 +00:00
parent 80a38c860d
commit 7ac5e40965
12 changed files with 309 additions and 228 deletions
--- a/DiscImageChef.Filesystems/AppleCommon/Info.cs
+++ b/DiscImageChef.Filesystems/AppleCommon/Info.cs
@@ -0,0 +1,99 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : AppleHFS.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Apple Hierarchical File System plugin.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Identifies the Apple Hierarchical File System and shows information.
+//
+// --[ 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 © 2011-2020 Natalia Portillo
+// ****************************************************************************/
+
+using System.Text;
+using DiscImageChef.Helpers;
+
+namespace DiscImageChef.Filesystems
+{
+    // Information from Inside Macintosh
+    // https://developer.apple.com/legacy/library/documentation/mac/pdf/Files/File_Manager.pdf
+    internal static partial class AppleCommon
+    {
+        internal static string GetBootBlockInformation(byte[] bbSector, Encoding Encoding)
+        {
+            if(bbSector is null ||
+               bbSector.Length < 0x100)
+                return null;
+
+            BootBlock bb = Marshal.ByteArrayToStructureBigEndian<BootBlock>(bbSector);
+
+            if(bb.bbID != BB_MAGIC)
+                return null;
+
+            var sb = new StringBuilder();
+            sb.AppendLine("Boot Block:");
+
+            if((bb.bbPageFlags & 0x40) == 0x40)
+                sb.AppendLine("Boot block should be executed.");
+
+            if((bb.bbPageFlags & 0x80) == 0x80)
+                sb.AppendLine("Boot block is in new unknown format.");
+            else
+            {
+                if(bb.bbPageFlags > 0)
+                    sb.AppendLine("Allocate secondary sound buffer at boot.");
+                else if(bb.bbPageFlags < 0)
+                    sb.AppendLine("Allocate secondary sound and video buffers at boot.");
+
+                sb.AppendFormat("System filename: {0}", StringHandlers.PascalToString(bb.bbSysName, Encoding)).
+                   AppendLine();
+
+                sb.AppendFormat("Finder filename: {0}", StringHandlers.PascalToString(bb.bbShellName, Encoding)).
+                   AppendLine();
+
+                sb.AppendFormat("Debugger filename: {0}", StringHandlers.PascalToString(bb.bbDbg1Name, Encoding)).
+                   AppendLine();
+
+                sb.AppendFormat("Disassembler filename: {0}", StringHandlers.PascalToString(bb.bbDbg2Name, Encoding)).
+                   AppendLine();
+
+                sb.AppendFormat("Startup screen filename: {0}",
+                                StringHandlers.PascalToString(bb.bbScreenName, Encoding)).AppendLine();
+
+                sb.AppendFormat("First program to execute at boot: {0}",
+                                StringHandlers.PascalToString(bb.bbHelloName, Encoding)).AppendLine();
+
+                sb.AppendFormat("Clipboard filename: {0}", StringHandlers.PascalToString(bb.bbScrapName, Encoding)).
+                   AppendLine();
+
+                sb.AppendFormat("Maximum opened files: {0}", bb.bbCntFCBs * 4).AppendLine();
+                sb.AppendFormat("Event queue size: {0}", bb.bbCntEvts).AppendLine();
+                sb.AppendFormat("Heap size with 128KiB of RAM: {0} bytes", bb.bb128KSHeap).AppendLine();
+                sb.AppendFormat("Heap size with 256KiB of RAM: {0} bytes", bb.bb256KSHeap).AppendLine();
+                sb.AppendFormat("Heap size with 512KiB of RAM or more: {0} bytes", bb.bbSysHeapSize).AppendLine();
+            }
+
+            return sb.ToString();
+        }
+    }
+}