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