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onnxruntime-extensions/base

base/base64.cc

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1// Copyright (c) Microsoft Corporation. All rights reserved.
2// Licensed under the MIT License.
3#include "base64.h"
4#include <stdexcept>
5
6const static std::string encodeLookup("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
7const static char padCharacter = '=';
8
9bool base64_encode(const std::vector<uint8_t>& input, std::string& encoded) {
10 encoded.clear();
11 encoded.reserve(((input.size() / 3) + (input.size() % 3 > 0)) * 4);
12 uint32_t temp;
13 std::vector<uint8_t>::const_iterator cursor = input.begin();
14 for (size_t idx = 0; idx < input.size() / 3; idx++) {
15 temp = (*cursor++) << 16; //Convert to big endian
16 temp += (*cursor++) << 8;
17 temp += (*cursor++);
18 encoded.append(1, encodeLookup[(temp & 0x00FC0000) >> 18]);
19 encoded.append(1, encodeLookup[(temp & 0x0003F000) >> 12]);
20 encoded.append(1, encodeLookup[(temp & 0x00000FC0) >> 6]);
21 encoded.append(1, encodeLookup[(temp & 0x0000003F)]);
22 }
23 switch (input.size() % 3) {
24 case 1:
25 temp = (*cursor++) << 16;
26 encoded.append(1, encodeLookup[(temp & 0x00FC0000) >> 18]);
27 encoded.append(1, encodeLookup[(temp & 0x0003F000) >> 12]);
28 encoded.append(2, padCharacter);
29 break;
30 case 2:
31 temp = (*cursor++) << 16;
32 temp += (*cursor++) << 8;
33 encoded.append(1, encodeLookup[(temp & 0x00FC0000) >> 18]);
34 encoded.append(1, encodeLookup[(temp & 0x0003F000) >> 12]);
35 encoded.append(1, encodeLookup[(temp & 0x00000FC0) >> 6]);
36 encoded.append(1, padCharacter);
37 break;
38 }
39 encoded = encoded;
40 return true;
41}
42
43bool base64_decode(const std::string& input, std::vector<uint8_t>& decoded) {
44 if (input.length() % 4)
45 return false;
46 size_t padding = 0;
47 if (input.length()) {
48 if (input[input.length() - 1] == padCharacter)
49 padding++;
50 if (input[input.length() - 2] == padCharacter)
51 padding++;
52 }
53
54 decoded.clear();
55 decoded.reserve(((input.length() / 4) * 3) - padding);
56 uint32_t temp = 0;
57 std::string::const_iterator cursor = input.begin();
58 size_t quantumPosition;
59 while (cursor != input.end()) {
60 for (quantumPosition = 0; quantumPosition < 4; ++quantumPosition) {
61 temp <<= 6;
62 if (*cursor >= 0x41 && *cursor <= 0x5A)
63 temp |= *cursor - 0x41;
64 else if (*cursor >= 0x61 && *cursor <= 0x7A)
65 temp |= *cursor - 0x47;
66 else if (*cursor >= 0x30 && *cursor <= 0x39)
67 temp |= *cursor + 0x04;
68 else if (*cursor == 0x2B)
69 temp |= 0x3E;
70 else if (*cursor == 0x2F)
71 temp |= 0x3F;
72 else if (*cursor == padCharacter) {
73 switch (input.end() - cursor) {
74 case 1: //One pad character
75 decoded.push_back((temp >> 16) & 0x000000FF);
76 decoded.push_back((temp >> 8) & 0x000000FF);
77 return true;
78 case 2: //Two pad characters
79 decoded.push_back((temp >> 10) & 0x000000FF);
80 return true;
81 default:
82 return false;
83 }
84 } else
85 return false;
86 ++cursor;
87 }
88 decoded.push_back((temp >> 16) & 0x000000FF);
89 decoded.push_back((temp >> 8) & 0x000000FF);
90 decoded.push_back((temp)&0x000000FF);
91 }
92 return true;
93}
94