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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#include <android-base/logging.h>
#include <net/if.h>
namespace android::nl {
unsigned int nametoindex(const std::string& ifname) {
const auto ifidx = if_nametoindex(ifname.c_str());
if (ifidx != 0) return ifidx;
if (errno != ENODEV) {
PLOG(ERROR) << "if_nametoindex(" << ifname << ") failed";
}
return 0;
}
std::string printableOnly(std::string str) {
const auto isInvalid = [](char c) { return !isprint(c); };
std::replace_if(str.begin(), str.end(), isInvalid, '?');
return str;
}
uint16_t crc16(const Buffer<uint8_t> data, uint16_t crc) {
for (const auto byte : data.getRaw()) {
crc ^= byte;
for (unsigned i = 0; i < 8; i++) {
if (crc & 1) {
crc = (crc >> 1) ^ 0xA001;
} else {
crc >>= 1;
}
}
}
return crc;
}
} // namespace android::nl
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