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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "components/payments/content/android/utility/fingerprint_parser.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/numerics/safe_conversions.h" | |
9 | |
10 namespace payments { | |
11 namespace { | |
12 | |
13 bool IsUpperCaseHexDigit(char c) { | |
14 return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F'); | |
15 } | |
16 | |
17 uint8_t HexDigitToByte(char c) { | |
18 DCHECK(IsUpperCaseHexDigit(c)); | |
19 return base::checked_cast<uint8_t>(c >= '0' && c <= '9' ? c - '0' | |
20 : c - 'A' + 10); | |
21 } | |
22 | |
23 } // namespace | |
24 | |
25 std::vector<uint8_t> FingerprintStringToByteArray(const std::string& input) { | |
26 std::vector<uint8_t> output; | |
27 if (input.size() != 32 * 3 - 1) | |
28 return output; | |
29 | |
30 for (size_t i = 0; i < input.size(); i += 3) { | |
31 if (i < input.size() - 2 && input[i + 2] != ':') { | |
32 output.clear(); | |
33 return output; | |
34 } | |
35 | |
36 char big_end = input[i]; | |
37 char little_end = input[i + 1]; | |
38 if (!IsUpperCaseHexDigit(big_end) || !IsUpperCaseHexDigit(little_end)) { | |
39 output.clear(); | |
40 return output; | |
41 } | |
42 | |
43 output.push_back(HexDigitToByte(big_end) * static_cast<uint8_t>(16) + | |
44 HexDigitToByte(little_end)); | |
45 } | |
46 | |
47 return output; | |
48 } | |
49 | |
50 } // namespace payments | |
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