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-rw-r--r--src/core/hle/service/mii/mii_util.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/core/hle/service/mii/mii_util.h b/src/core/hle/service/mii/mii_util.h
index ddb544c23..3534fa31d 100644
--- a/src/core/hle/service/mii/mii_util.h
+++ b/src/core/hle/service/mii/mii_util.h
@@ -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();
}