writing savemode to the savegame binary

src/net/torvald/terrarum/tvda/DiskSkimmer.kt

@@ -301,6 +301,11 @@ removefile:
         }
     }
 
+    fun setSaveMode(bits: Int) {
+        fa.seek(49L)
+        fa.writeByte(bits)
+    }
+
     ///////////////////////////////////////////////////////
     // THESE ARE METHODS TO SUPPORT ON-LINE MODIFICATION //
     ///////////////////////////////////////////////////////

src/net/torvald/terrarum/tvda/VirtualDisk.kt

@@ -64,7 +64,10 @@ Version 254 is a customised version of TEVD tailored to be used as a savegame fo
     Int8        0xFE
     Int8        Disk properties flag 1
                 0th bit: readonly
-    Int8[15]    Extra info bytes
+    Int8        Save type
+                0th bit: unset - full save; set - quick save
+                1st bit: set - generated by autosave
+    Int8[14]    Extra info bytes
     Unit8[236]  Rest of the long disk name (268 bytes total)
 
     (Header size: 300 bytes)
@@ -127,6 +130,9 @@ class VirtualDisk(
     var isReadOnly: Boolean
         set(value) { extraInfoBytes[0] = (extraInfoBytes[0] and 0xFE.toByte()) or value.toBit() }
         get() = capacity == 0L || (extraInfoBytes.size > 0 && extraInfoBytes[0].and(1) == 1.toByte())
+    var saveMode: Int
+        set(value) { extraInfoBytes[1] = value.toByte() }
+        get() = extraInfoBytes[1].toUint()
     fun getDiskNameString(charset: Charset) = diskName.toCanonicalString(charset)
     val root: DiskEntry
         get() = entries[0]!!