Implement decoding High Sierra path table.

DiscImageChef.Filesystems/ISO9660/PathTable.cs

@@ -35,5 +35,39 @@ namespace DiscImageChef.Filesystems.ISO9660
 
             return table.ToArray();
         }
+
+        PathTableEntryInternal[] DecodeHighSierraPathTable(byte[] data)
+        {
+            if(data is null) return null;
+
+            List<PathTableEntryInternal> table = new List<PathTableEntryInternal>();
+
+            int off = 0;
+            while(off < data.Length)
+            {
+                HighSierraPathTableEntry entry =
+                    Marshal.ByteArrayToStructureBigEndian<HighSierraPathTableEntry>(data, off,
+                                                                                    Marshal
+                                                                                       .SizeOf<HighSierraPathTableEntry
+                                                                                        >());
+
+                if(entry.name_len == 0) break;
+
+                off += Marshal.SizeOf<HighSierraPathTableEntry>();
+
+                string name = Encoding.GetString(data, off, entry.name_len);
+
+                table.Add(new PathTableEntryInternal
+                {
+                    Extent = entry.start_lbn, Name = name, Parent = entry.parent_dirno
+                });
+
+                off += entry.name_len;
+
+                if(entry.name_len % 2 != 0) off++;
+            }
+
+            return table.ToArray();
+        }
     }
 }