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mc.mitm: add templated crc8 computation and move utilities to their own source directory

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ndeadly 2024-07-09 23:48:36 +02:00
parent 581ae0d9e8
commit 8cddf8fbeb
5 changed files with 83 additions and 37 deletions
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30
mc_mitm/source/controllers/emulated_switch_controller.cpp
View file

@ -14,6 +14,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "emulated_switch_controller.hpp"
#include "../utils.hpp"
#include "../mcmitm_config.hpp"
namespace ams::controller {
@ -87,33 +88,8 @@ namespace ams::controller {
}
// CRC-8 with polynomial 0x7 for NFC/IR packets
constinit const u8 Crc8Lookup[] = {
0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};
u8 ComputeCrc8(const void *data, size_t size) {
auto *bytes = reinterpret_cast<const u8 *>(data);
u8 crc = 0x00;
for (size_t i = 0; i < size; ++i) {
crc = Crc8Lookup[crc ^ bytes[i]];
}
return crc;
constexpr u8 ComputeCrc8(const void *data, size_t size) {
return utils::Crc8<7>::Calculate(data, size);
}
}

11
mc_mitm/source/utils.hpp
View file

@ -13,12 +13,5 @@
* 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 "bluetooth_mitm/bluetooth/bluetooth_types.hpp"
namespace ams::utils {
bool BluetoothAddressCompare(const bluetooth::Address *addr1, const bluetooth::Address *addr2);
Result BluetoothAddressToString(const bluetooth::Address *address, char *out, size_t out_size);
}
#include "utils/utils_bluetooth_address.hpp"
#include "utils/utils_crc8.hpp"

2
mc_mitm/source/utils.cpp → mc_mitm/source/utils/utils_bluetooth_address.cpp
View file

@ -13,7 +13,7 @@
* 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 "utils.hpp"
#include "utils_bluetooth_address.hpp"
namespace ams::utils {

24
mc_mitm/source/utils/utils_bluetooth_address.hpp Normal file
View file

@ -0,0 +1,24 @@
/*
* Copyright (c) 2020-2024 ndeadly
*
* 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 "../bluetooth_mitm/bluetooth/bluetooth_types.hpp"
namespace ams::utils {
bool BluetoothAddressCompare(const bluetooth::Address *addr1, const bluetooth::Address *addr2);
Result BluetoothAddressToString(const bluetooth::Address *address, char *out, size_t out_size);
}

53
mc_mitm/source/utils/utils_crc8.hpp Normal file
View file

@ -0,0 +1,53 @@
/*
* Copyright (c) 2020-2024 ndeadly
*
* 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>
namespace ams::utils {
template <u8 Polynomial>
class Crc8 {
public:
static constexpr u8 Calculate(const void *data, size_t size, u8 seed = 0x00) {
auto *bytes = reinterpret_cast<const u8 *>(data);
u8 crc = seed;
for (size_t i = 0; i < size; ++i) {
crc = CrcLookup[crc ^ bytes[i]];
}
return crc;
}
private:
static constexpr std::array<u8, UINT8_MAX> CrcLookup = []() {
std::array<u8, UINT8_MAX> table {};
for (size_t i = 0; i < UINT8_MAX; ++i) {
u8 crc = i;
for (int b = 8; b > 0; --b) {
if (crc & BIT(7)) {
crc = (crc << 1) ^ Polynomial;
} else {
crc <<= 1;
}
}
table[i] = crc;
}
return table;
}();
};
}