No gba save format

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No$GBA SRAM save file format:

  • HEADER:
addr size description
00-1E 31 ID string = 'NocashGbaBackupMediaSavDataFile'
1F 1 Always 0x1A
20-23 4 Unknown (may be for No$GBA internal use)
24 1 Day of the last time No$GBA saved (1-31)
25 1 Month of the last time No$GBA saved (1-12)
26-27 2 Year of the last time No$GBA saved (eg. 2012)
28 1 Hour of the last time No$GBA saved (0-23)
29 1 Minute of the last time No$GBA saved (0-59)
2A-2B 2 Unknown (may be for No$GBA internal use)
2C-2F 4 Unknown (may be for No$GBA internal use)
30-3F 16 Always 0x00
40-43 4 Always 'SRAM'
44-47 4 Compression method:
  • 0 - Uncompressed;
  • 1 - Compressed
48-4B 4 If method = 0 then
size of unpacked data
else
size of packed data
4C-4F 4 If method = 0 then
start address of data
else
size of unpacked data
  • unpack:

All data splited on blocks.

xx yy xx > 0x80 then yy repeat xx-0x80 times;
xx yy zz zz xx == 0x80 then yy repeat zzzz times;
xx yy...zz xx < 0x80 then data read next xx values
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