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service: mii: Add device crc16

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This commit is contained in:
german77 2023-09-17 10:45:24 -06:00
parent 2f22b53732
commit bd409c3416
1 changed files with 26 additions and 0 deletions
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26
src/core/hle/service/mii/mii_util.h
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@ -28,6 +28,32 @@ public:
return Common::swap16(static_cast<u16>(crc));
}
static u16 CalculateDeviceCrc16(const Common::UUID& uuid, std::size_t data_size) {
constexpr u16 magic{0x1021};
s32 crc{};
for (std::size_t i = 0; i < uuid.uuid.size(); i++) {
for (std::size_t j = 0; j < 8; j++) {
crc <<= 1;
if ((crc & 0x10000) != 0) {
crc = crc ^ magic;
}
}
crc ^= uuid.uuid[i];
}
// As much as this looks wrong this is what N's does
for (std::size_t i = 0; i < data_size * 8; i++) {
crc <<= 1;
if ((crc & 0x10000) != 0) {
crc = crc ^ magic;
}
}
return Common::swap16(static_cast<u16>(crc));
}
static Common::UUID MakeCreateId() {
return Common::UUID::MakeRandomRFC4122V4();
}