mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-21 01:42:12 +00:00
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <stratosphere.hpp>
|
|
#include "cal_crc_utils.hpp"
|
|
|
|
namespace ams::cal::impl {
|
|
|
|
namespace {
|
|
|
|
constexpr inline const u16 CrcTable[0x10] = {
|
|
0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
|
|
0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
|
|
};
|
|
|
|
}
|
|
|
|
u16 CalculateCrc16(const void *data, size_t size) {
|
|
AMS_ASSERT(data != nullptr);
|
|
|
|
u16 crc = 0x55AA;
|
|
const u8 *data_u8 = static_cast<const u8 *>(data);
|
|
for (size_t i = 0; i < size; ++i) {
|
|
crc = (crc >> 4) ^ (CrcTable[crc & 0xF]) ^ (CrcTable[(data_u8[i] >> 0) & 0xF]);
|
|
crc = (crc >> 4) ^ (CrcTable[crc & 0xF]) ^ (CrcTable[(data_u8[i] >> 4) & 0xF]);
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
Result ValidateCalibrationCrc(const void *data, size_t size) {
|
|
AMS_ASSERT(data != nullptr);
|
|
AMS_ASSERT(size >= sizeof(u16));
|
|
|
|
const u16 crc = *reinterpret_cast<const u16 *>(reinterpret_cast<uintptr_t>(data) + size - sizeof(u16));
|
|
R_UNLESS(CalculateCrc16(data, size - sizeof(u16)) == crc, cal::ResultCalibrationDataCrcError());
|
|
|
|
return ResultSuccess();
|
|
}
|
|
|
|
}
|