Mercurial > hg > orthanc
comparison Resources/base64/base64.cpp @ 24:166664f0f860
base64
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 28 Aug 2012 10:42:43 +0200 |
parents | |
children | de8a5329b069 |
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23:62bd05fe4b7c | 24:166664f0f860 |
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1 /* | |
2 base64.cpp and base64.h | |
3 | |
4 Copyright (C) 2004-2008 René Nyffenegger | |
5 | |
6 This source code is provided 'as-is', without any express or implied | |
7 warranty. In no event will the author be held liable for any damages | |
8 arising from the use of this software. | |
9 | |
10 Permission is granted to anyone to use this software for any purpose, | |
11 including commercial applications, and to alter it and redistribute it | |
12 freely, subject to the following restrictions: | |
13 | |
14 1. The origin of this source code must not be misrepresented; you must not | |
15 claim that you wrote the original source code. If you use this source code | |
16 in a product, an acknowledgment in the product documentation would be | |
17 appreciated but is not required. | |
18 | |
19 2. Altered source versions must be plainly marked as such, and must not be | |
20 misrepresented as being the original source code. | |
21 | |
22 3. This notice may not be removed or altered from any source distribution. | |
23 | |
24 René Nyffenegger rene.nyffenegger@adp-gmbh.ch | |
25 | |
26 */ | |
27 | |
28 #include "base64.h" | |
29 #include <string.h> | |
30 | |
31 static const std::string base64_chars = | |
32 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
33 "abcdefghijklmnopqrstuvwxyz" | |
34 "0123456789+/"; | |
35 | |
36 | |
37 static inline bool is_base64(unsigned char c) { | |
38 return (isalnum(c) || (c == '+') || (c == '/')); | |
39 } | |
40 | |
41 std::string base64_encode(const char* stringToEncode) { | |
42 unsigned char const* bytes_to_encode = reinterpret_cast<unsigned char const*>(stringToEncode); | |
43 unsigned int in_len = strlen(stringToEncode); | |
44 | |
45 std::string ret; | |
46 int i = 0; | |
47 int j = 0; | |
48 unsigned char char_array_3[3]; | |
49 unsigned char char_array_4[4]; | |
50 | |
51 while (in_len--) { | |
52 char_array_3[i++] = *(bytes_to_encode++); | |
53 if (i == 3) { | |
54 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; | |
55 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); | |
56 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); | |
57 char_array_4[3] = char_array_3[2] & 0x3f; | |
58 | |
59 for(i = 0; (i <4) ; i++) | |
60 ret += base64_chars[char_array_4[i]]; | |
61 i = 0; | |
62 } | |
63 } | |
64 | |
65 if (i) | |
66 { | |
67 for(j = i; j < 3; j++) | |
68 char_array_3[j] = '\0'; | |
69 | |
70 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; | |
71 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); | |
72 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); | |
73 char_array_4[3] = char_array_3[2] & 0x3f; | |
74 | |
75 for (j = 0; (j < i + 1); j++) | |
76 ret += base64_chars[char_array_4[j]]; | |
77 | |
78 while((i++ < 3)) | |
79 ret += '='; | |
80 | |
81 } | |
82 | |
83 return ret; | |
84 | |
85 } | |
86 | |
87 std::string base64_decode(const std::string& encoded_string) { | |
88 int in_len = encoded_string.size(); | |
89 int i = 0; | |
90 int j = 0; | |
91 int in_ = 0; | |
92 unsigned char char_array_4[4], char_array_3[3]; | |
93 std::string ret; | |
94 | |
95 while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) { | |
96 char_array_4[i++] = encoded_string[in_]; in_++; | |
97 if (i ==4) { | |
98 for (i = 0; i <4; i++) | |
99 char_array_4[i] = base64_chars.find(char_array_4[i]); | |
100 | |
101 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); | |
102 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); | |
103 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; | |
104 | |
105 for (i = 0; (i < 3); i++) | |
106 ret += char_array_3[i]; | |
107 i = 0; | |
108 } | |
109 } | |
110 | |
111 if (i) { | |
112 for (j = i; j <4; j++) | |
113 char_array_4[j] = 0; | |
114 | |
115 for (j = 0; j <4; j++) | |
116 char_array_4[j] = base64_chars.find(char_array_4[j]); | |
117 | |
118 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); | |
119 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); | |
120 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; | |
121 | |
122 for (j = 0; (j < i - 1); j++) ret += char_array_3[j]; | |
123 } | |
124 | |
125 return ret; | |
126 } |