Mercurial > hg > orthanc

annotate Resources/ThirdParty/base64/base64.cpp @ 3407:b7728227a852

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
C++ wrappers: compatibility mode if missing OrthancPluginRegisterMultipartRestCallback()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 08 Jun 2019 11:57:46 +0200
parents 79178122842c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
1 /*
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
2 base64.cpp and base64.h
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
3
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
4 Copyright (C) 2004-2008 René Nyffenegger
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
5
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
6 This source code is provided 'as-is', without any express or implied
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
7 warranty. In no event will the author be held liable for any damages
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
8 arising from the use of this software.
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
9
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
10 Permission is granted to anyone to use this software for any purpose,
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
11 including commercial applications, and to alter it and redistribute it
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
12 freely, subject to the following restrictions:
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
13
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
14 1. The origin of this source code must not be misrepresented; you must not
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
15 claim that you wrote the original source code. If you use this source code
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
16 in a product, an acknowledgment in the product documentation would be
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
17 appreciated but is not required.
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
18
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
19 2. Altered source versions must be plainly marked as such, and must not be
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
20 misrepresented as being the original source code.
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
21
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
22 3. This notice may not be removed or altered from any source distribution.
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
23
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
24 René Nyffenegger rene.nyffenegger@adp-gmbh.ch
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
25
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
26 ------------------------------
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
27 This version has been modified (changed the interface + use another decoding algorithm
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
28 inspired from https://stackoverflow.com/a/34571089 which was faster)
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
29 */
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
30
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
31 #include "base64.h"
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
32 #include <string.h>
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
33 #include <vector>
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
34
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
35 static const std::string base64_chars =
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
36 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
37 "abcdefghijklmnopqrstuvwxyz"
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
38 "0123456789+/";
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
39
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
40 static inline bool is_base64(unsigned char c) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
41 return (isalnum(c) || (c == '+') || (c == '/'));
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
42 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
43
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
44 void base64_encode(std::string& result, const std::string& stringToEncode)
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
45 {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
46 const unsigned char* bytes_to_encode = reinterpret_cast<const unsigned char*>
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
47 (stringToEncode.size() > 0 ? &stringToEncode[0] : NULL);
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
48 size_t in_len = stringToEncode.size();
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
49
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
50 result.reserve(result.size() + in_len * 4 / 3 + 10);
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
51
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
52 int i = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
53 int j = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
54 unsigned char char_array_3[3];
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
55 unsigned char char_array_4[4];
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
56
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
57 while (in_len--) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
58 char_array_3[i++] = *(bytes_to_encode++);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
59 if (i == 3) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
60 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
61 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
62 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
63 char_array_4[3] = char_array_3[2] & 0x3f;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
64
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
65 for(i = 0; (i <4) ; i++)
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
66 result += base64_chars[char_array_4[i]];
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
67 i = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
68 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
69 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
70
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
71 if (i)
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
72 {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
73 for(j = i; j < 3; j++)
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
74 char_array_3[j] = '\0';
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
75
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
76 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
77 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
78 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
79 char_array_4[3] = char_array_3[2] & 0x3f;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
80
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
81 for (j = 0; (j < i + 1); j++)
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
82 result += base64_chars[char_array_4[j]];
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
83
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
84 while((i++ < 3))
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
85 result += '=';
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
86
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
87 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
88 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
89
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
90 // old code from René Nyffenegger. This code is slower
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
91 void base64_decode_old(std::string& result, const std::string& encoded_string) {
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
92 size_t in_len = encoded_string.size();
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
93 int i = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
94 int j = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
95 int in_ = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
96 unsigned char char_array_4[4], char_array_3[3];
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
97
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
98 result.reserve(result.size() + in_len * 3 / 4 + 10);
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
99
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
100 while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
101 char_array_4[i++] = encoded_string[in_]; in_++;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
102 if (i ==4) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
103 for (i = 0; i <4; i++)
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
104 char_array_4[i] = base64_chars.find(char_array_4[i]);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
105
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
106 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
107 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
108 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
109
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
110 for (i = 0; (i < 3); i++)
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
111 result += char_array_3[i];
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
112 i = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
113 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
114 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
115
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
116 if (i) {
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
117 for (j = i; j <4; j++)
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
118 char_array_4[j] = 0;
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
119
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
120 for (j = 0; j <4; j++)
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
121 char_array_4[j] = base64_chars.find(char_array_4[j]);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
122
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
123 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
124 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
125 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
126
3325
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
127 for (j = 0; (j < i - 1); j++)
2e7c5c15ba25 reserve size for base64 decoding + avoid copy. In a test in WASM, encoding 3MB took 110ms instead of 1400ms previously
Alain Mazy <alain@mazy.be>
parents: 2102
diff changeset
128 result += char_array_3[j];
2102
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
129 }
f0544ab9396b fix line endings for msvc
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 950
diff changeset
130 }
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
131
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
132
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
133 // new code from https://stackoverflow.com/a/34571089
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
134 // note that the encoding algorithm from this page was slower (and bugged !)
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
135 // this code is not using std::vector::find
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
136
3329
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
137 // static init equivalent to:
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
138 // decode_indexes.assign(256, -1);
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
139 // for (int i=0; i<64; ++i)
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
140 // decode_indexes[base64_chars[i]] = i;
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
141
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
142 static const int decode_indexes[] = {
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
143 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
144 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
145 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
146 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
147 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
148 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
149 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
150 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
151 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
152 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
153 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
154 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
155 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
156 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
157 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
158 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
98cd69135999 fix base64 static init
Alain Mazy <alain@mazy.be>
parents: 3326
diff changeset
159 };
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
160
3332
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
161
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
162 void base64_decode(std::string& result, const std::string &stringToDecode) {
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
163
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
164 result.reserve(result.size() + stringToDecode.size() * 3 / 4 + 10);
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
165
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
166 int val=0, valb=-8;
3332
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
167 for (std::string::const_iterator c = stringToDecode.begin(); c != stringToDecode.end(); ++c)
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
168 {
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
169 size_t index = static_cast<size_t>(*c);
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
170 if (decode_indexes[index] == -1)
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
171 break;
3332
79178122842c fix warnings
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 3329
diff changeset
172 val = (val<<6) + decode_indexes[index];
3326
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
173 valb += 6;
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
174 if (valb>=0) {
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
175 result.push_back(char((val>>valb)&0xFF));
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
176 valb-=8;
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
177 }
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
178 }
b21d4cc8e5d1 speed up base64 decoding + added tests
Alain Mazy <alain@mazy.be>
parents: 3325
diff changeset
179 }