1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "Utils.h"
18
19 #include <string.h>
20
21 namespace android {
22
zeroMemory(uint8_t * data,size_t size)23 void zeroMemory(uint8_t* data, size_t size) {
24 memset(data, 0, size);
25 }
26
HexString(const void * bytes,size_t len)27 std::string HexString(const void* bytes, size_t len) {
28 LOG_ALWAYS_FATAL_IF(len > 0 && bytes == nullptr, "%p %zu", bytes, len);
29
30 // b/132916539: Doing this the 'C way', std::setfill triggers ubsan implicit conversion
31 const uint8_t* bytes8 = static_cast<const uint8_t*>(bytes);
32 const char chars[] = "0123456789abcdef";
33 std::string result;
34 result.resize(len * 2);
35
36 for (size_t i = 0; i < len; i++) {
37 const auto c = bytes8[i];
38 result[2 * i] = chars[c >> 4];
39 result[2 * i + 1] = chars[c & 0xf];
40 }
41
42 return result;
43 }
44
45 } // namespace android
46