base64.cpp

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DATE: Dec. 4, 2013, 11:56 a.m.

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  1. /*
  2. base64.cpp and base64.h
  4. Copyright (C) 2004-2008 René Nyffenegger
  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.
  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:
  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.
  19. 2. Altered source versions must be plainly marked as such, and must not be
  20. misrepresented as being the original source code.
  22. 3. This notice may not be removed or altered from any source distribution.
  24. René Nyffenegger rene.nyffenegger@adp-gmbh.ch
  26. */
  28. #include "base64.h"
  29. #include <iostream>
  31. static const std::string base64_chars =
  32. "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  33. "abcdefghijklmnopqrstuvwxyz"
  34. "0123456789+/";
  37. static inline bool is_base64(unsigned char c) {
  38. return (isalnum(c) || (c == '+') || (c == '/'));
  39. }
  41. std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
  42. std::string ret;
  43. int i = 0;
  44. int j = 0;
  45. unsigned char char_array_3[3];
  46. unsigned char char_array_4[4];
  48. while (in_len--) {
  49. char_array_3[i++] = *(bytes_to_encode++);
  50. if (i == 3) {
  51. char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
  52. char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
  53. char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
  54. char_array_4[3] = char_array_3[2] & 0x3f;
  56. for(i = 0; (i <4) ; i++)
  57. ret += base64_chars[char_array_4[i]];
  58. i = 0;
  59. }
  60. }
  62. if (i)
  63. {
  64. for(j = i; j < 3; j++)
  65. char_array_3[j] = '\0';
  67. char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
  68. char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
  69. char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
  70. char_array_4[3] = char_array_3[2] & 0x3f;
  72. for (j = 0; (j < i + 1); j++)
  73. ret += base64_chars[char_array_4[j]];
  75. while((i++ < 3))
  76. ret += '=';
  78. }
  80. return ret;
  82. }
  84. std::string base64_decode(std::string const& encoded_string) {
  85. int in_len = encoded_string.size();
  86. int i = 0;
  87. int j = 0;
  88. int in_ = 0;
  89. unsigned char char_array_4[4], char_array_3[3];
  90. std::string ret;
  92. while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
  93. char_array_4[i++] = encoded_string[in_]; in_++;
  94. if (i ==4) {
  95. for (i = 0; i <4; i++)
  96. char_array_4[i] = base64_chars.find(char_array_4[i]);
  98. char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
  99. char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
  100. char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
  102. for (i = 0; (i < 3); i++)
  103. ret += char_array_3[i];
  104. i = 0;
  105. }
  106. }
  108. if (i) {
  109. for (j = i; j <4; j++)
  110. char_array_4[j] = 0;
  112. for (j = 0; j <4; j++)
  113. char_array_4[j] = base64_chars.find(char_array_4[j]);
  115. char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
  116. char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
  117. char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
  119. for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
  120. }
  122. return ret;
  123. }
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