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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <random>
#include <span>
#include "common/common_types.h"
#include "common/swap.h"
#include "common/uuid.h"
#include "core/hle/service/mii/mii_types.h"
namespace Service::Mii {
class MiiUtil {
public:
static u16 CalculateCrc16(const void* data, std::size_t size) {
s32 crc{};
for (std::size_t i = 0; i < size; i++) {
crc ^= static_cast<const u8*>(data)[i] << 8;
for (std::size_t j = 0; j < 8; j++) {
crc <<= 1;
if ((crc & 0x10000) != 0) {
crc = (crc ^ 0x1021) & 0xFFFF;
}
}
}
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();
}
static Common::UUID GetDeviceId() {
// This should be nn::settings::detail::GetMiiAuthorId()
return Common::UUID::MakeDefault();
}
template <typename T>
static T GetRandomValue(T min, T max) {
std::random_device device;
std::mt19937 gen(device());
std::uniform_int_distribution<u64> distribution(static_cast<u64>(min),
static_cast<u64>(max));
return static_cast<T>(distribution(gen));
}
template <typename T>
static T GetRandomValue(T max) {
return GetRandomValue<T>({}, max);
}
static bool IsFontRegionValid(FontRegion font, std::span<const char16_t> text) {
// TODO: This function needs to check against the font tables
return true;
}
};
} // namespace Service::Mii
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