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comparison java/src/com/aurellem/gb/Gb.java @ 76:d7c38ce83421

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working on disk-backup for save-states
author Robert McIntyre <rlm@mit.edu>
date Thu, 08 Mar 2012 19:48:54 -0600
parents 4699c7bab77d
children ad6ebe886a21
comparison
equal deleted inserted replaced
75:eb7d4efe0f34 76:d7c38ce83421
30 30
31 public static native void step(int keymask); 31 public static native void step(int keymask);
32 32
33 public static native void shutdown(); 33 public static native void shutdown();
34 34
35 public static native void saveState(ByteBuffer buffer, int size); 35 public static native long saveState(ByteBuffer buffer, int size);
36 36
37 public static native void loadState(ByteBuffer buffer, int size); 37 public static native void loadState(ByteBuffer buffer, int size);
38 38
39 public static final int SAVE_SIZE = 90000; 39 public static final int MAX_SAVE_SIZE = 90000;
40 40
41 public static ByteBuffer saveState(){ 41 public static ByteBuffer createDirectByteBuffer(int capacity){
42 byte[] zeros = new byte[capacity];
42 ByteBuffer buf = 43 ByteBuffer buf =
43 ByteBuffer.allocateDirect(SAVE_SIZE) 44 ByteBuffer.allocateDirect(capacity)
44 .order(ByteOrder.nativeOrder()); 45 .order(ByteOrder.nativeOrder());
46 buf.put(zeros);
45 buf.clear(); 47 buf.clear();
46 saveState(buf, SAVE_SIZE);
47 buf.flip();
48 return buf; 48 return buf;
49 } 49 }
50 50
51 public static ByteBuffer saveBuffer(){
52 return createDirectByteBuffer(MAX_SAVE_SIZE);
53 }
54
55 public static ByteBuffer saveState(){
56 ByteBuffer buf = saveBuffer();
57
58 saveState(buf, buf.capacity());
59
60 // determine the extent of the saved data
61 int position = buf.capacity() - 1;
62 for (int i = position; i > 0; i--){
63 if (0 != buf.get(i)){
64 position = i;
65 break;
66 }}
67 System.out.println("Position: " + position);
68 byte[] saveArray = new byte[position];
69 ByteBuffer save = createDirectByteBuffer(position);
70 buf.get(saveArray, 0 , position);
71 save.put(saveArray);
72 save.rewind();
73 return save;
74 }
75
51 public static void loadState(ByteBuffer saveState){ 76 public static void loadState(ByteBuffer saveState){
52 loadState(saveState, SAVE_SIZE); 77 loadState(saveState, MAX_SAVE_SIZE);
53 } 78 }
54 79
55 public static native int getROMSize(); 80 public static native int getROMSize();
56 public static native int getRAMSize(); 81 public static native int getRAMSize();
57 82