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comparison Resources/base64/base64.cpp @ 24:166664f0f860

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base64
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 28 Aug 2012 10:42:43 +0200
parents
children de8a5329b069
comparison
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23:62bd05fe4b7c 24:166664f0f860
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 }