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comparison Framework/Orthanc/Resources/ThirdParty/base64/base64.cpp @ 1:2dbe613f6c93

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add orthanc core
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 14 Oct 2016 15:39:01 +0200
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0:351ab0da0150 1:2dbe613f6c93
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 std::string& stringToEncode)
42 {
43 const unsigned char* bytes_to_encode = reinterpret_cast<const unsigned char*>
44 (stringToEncode.size() > 0 ? &stringToEncode[0] : NULL);
45 unsigned int in_len = stringToEncode.size();
46
47 std::string ret;
48 int i = 0;
49 int j = 0;
50 unsigned char char_array_3[3];
51 unsigned char char_array_4[4];
52
53 while (in_len--) {
54 char_array_3[i++] = *(bytes_to_encode++);
55 if (i == 3) {
56 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
57 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
58 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
59 char_array_4[3] = char_array_3[2] & 0x3f;
60
61 for(i = 0; (i <4) ; i++)
62 ret += base64_chars[char_array_4[i]];
63 i = 0;
64 }
65 }
66
67 if (i)
68 {
69 for(j = i; j < 3; j++)
70 char_array_3[j] = '\0';
71
72 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
73 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
74 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
75 char_array_4[3] = char_array_3[2] & 0x3f;
76
77 for (j = 0; (j < i + 1); j++)
78 ret += base64_chars[char_array_4[j]];
79
80 while((i++ < 3))
81 ret += '=';
82
83 }
84
85 return ret;
86 }
87
88
89 std::string base64_decode(const std::string& encoded_string) {
90 int in_len = encoded_string.size();
91 int i = 0;
92 int j = 0;
93 int in_ = 0;
94 unsigned char char_array_4[4], char_array_3[3];
95 std::string ret;
96
97 while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
98 char_array_4[i++] = encoded_string[in_]; in_++;
99 if (i ==4) {
100 for (i = 0; i <4; i++)
101 char_array_4[i] = base64_chars.find(char_array_4[i]);
102
103 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
104 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
105 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
106
107 for (i = 0; (i < 3); i++)
108 ret += char_array_3[i];
109 i = 0;
110 }
111 }
112
113 if (i) {
114 for (j = i; j <4; j++)
115 char_array_4[j] = 0;
116
117 for (j = 0; j <4; j++)
118 char_array_4[j] = base64_chars.find(char_array_4[j]);
119
120 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
121 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
122 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
123
124 for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
125 }
126
127 return ret;
128 }