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APS (GBA)

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Boris Timofeev edited this page Jan 9, 2017 · 2 revisions

APS file format (GBA)

Main format

Header
Record
...
Record

Header

Magic string "APS1" - 4 bytes  
Original file size - 4 bytes  
Modified file size - 4 bytes

Record

Offset in file - 4 bytes  
CRC16 of 64kb block from original file - 2 bytes  
CRC16 of 64kb block from modified file - 2 bytes  
Bytes to patch (original data block XOR modified data block) - 64 KB
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