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ronitsinha
2023-07-22 00:07:04 -04:00
parent 1e3c66e272
commit caebbddd18
12 changed files with 118 additions and 127 deletions
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20
util.cpp
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@@ -71,4 +71,24 @@ uint32_t round_to_multiple (uint32_t n, uint32_t multiple) {
if (remainder == 0) return n;
return n + multiple - remainder;
}
// https://github.com/pleonex/Ninokuni/blob/master/Programs/NinoPatcher/NinoPatcher/Crc16.cs
// https://web.archive.org/web/20110718184246/http://nocash.emubase.de/gbatek.htm#biosmiscfunctions
// https://github.com/Zetten/hachoir/blob/master/hachoir-parser/hachoir_parser/program/nds.py
uint16_t compute_crc16 (uint8_t *bytes, int size) {
uint16_t val[8] = {0xC0C1,0xC181,0xC301,0xC601,0xCC01,0xD801,0xF001,0xA001};
uint16_t crc = 0xFFFF;
for (int i = 0; i < size; i++) {
crc ^= bytes[i];
for (int j = 0; j < 8; j++) {
if (crc & 1) crc = (crc >> 1) ^ 0xA001;
else crc >>= 1;
// crc = (crc & 1) ? (crc >> 1) ^ (val[j] << (7-j)) : (crc >> 1);
}
}
return crc;
}