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/*
* Copyright (C) 2021 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 "android-base/hex.h"
#include "android-base/logging.h"
namespace android {
namespace base {
std::string HexString(const void* bytes, size_t len) {
CHECK(bytes != nullptr || len == 0) << bytes << " " << len;
// b/132916539: Doing this the 'C way', std::setfill triggers ubsan implicit conversion
const uint8_t* bytes8 = static_cast<const uint8_t*>(bytes);
const char chars[] = "0123456789abcdef";
std::string result;
result.resize(len * 2);
for (size_t i = 0; i < len; i++) {
result[2 * i] = chars[bytes8[i] >> 4];
result[2 * i + 1] = chars[bytes8[i] & 0xf];
}
return result;
}
} // namespace base
} // namespace android
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