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comparison C++/Base64.h @ 243:73e5381d7baf

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Base64: return output #291
author David Demelier <markand@malikania.fr>
date Sat, 13 Sep 2014 10:27:41 +0200
parents a9883eeb9757
children
comparison
equal deleted inserted replaced
242:a9883eeb9757 243:73e5381d7baf
52 * InputIt must be InputIterator 52 * InputIt must be InputIterator
53 * OutputIt must be OutputIterator 53 * OutputIt must be OutputIterator
54 * 54 *
55 * @param input the beginning 55 * @param input the beginning
56 * @param end the end of the data 56 * @param end the end of the data
57 * @output the output destination 57 * @param output the output destination
58 * @return output
58 */ 59 */
59 template <typename InputIt, typename OutputIt> 60 template <typename InputIt, typename OutputIt>
60 static void encode(InputIt input, InputIt end, OutputIt output) 61 static OutputIt encode(InputIt input, InputIt end, OutputIt output)
61 { 62 {
62 while (input != end) { 63 while (input != end) {
63 char inputbuf[3] = { 0, 0, 0 }; 64 char inputbuf[3] = { 0, 0, 0 };
64 int count; 65 int count;
65 66
69 *output++ = lookup(inputbuf[0] >> 2 & 0x3f); 70 *output++ = lookup(inputbuf[0] >> 2 & 0x3f);
70 *output++ = lookup((inputbuf[0] << 4 & 0x3f) | (inputbuf[1] >> 4 & 0x0f)); 71 *output++ = lookup((inputbuf[0] << 4 & 0x3f) | (inputbuf[1] >> 4 & 0x0f));
71 *output++ = (count < 2) ? '=' : lookup((inputbuf[1] << 2 & 0x3c) | (inputbuf[2] >> 6 & 0x03)); 72 *output++ = (count < 2) ? '=' : lookup((inputbuf[1] << 2 & 0x3c) | (inputbuf[2] >> 6 & 0x03));
72 *output++ = (count < 3) ? '=' : lookup(inputbuf[2] & 0x3f); 73 *output++ = (count < 3) ? '=' : lookup(inputbuf[2] & 0x3f);
73 } 74 }
75
76 return output;
74 } 77 }
75 78
76 /** 79 /**
77 * Decode the input to the output. Requirements: 80 * Decode the input to the output. Requirements:
78 * InputIt must be InputIterator 81 * InputIt must be InputIterator
79 * OutputIt must be OutputIterator 82 * OutputIt must be OutputIterator
80 * 83 *
81 * @param input the beginning 84 * @param input the beginning
82 * @param end the end of the data 85 * @param end the end of the data
83 * @output the output destination 86 * @param output the output destination
87 * @return output
84 * @throw std::invalid_argument on bad base64 string 88 * @throw std::invalid_argument on bad base64 string
85 */ 89 */
86 template <typename InputIt, typename OutputIt> 90 template <typename InputIt, typename OutputIt>
87 static void decode(InputIt input, InputIt end, OutputIt output) 91 static OutputIt decode(InputIt input, InputIt end, OutputIt output)
88 { 92 {
89 while (input != end) { 93 while (input != end) {
90 char inputbuf[4] = { 0, 0, 0, 0 }; 94 char inputbuf[4] = { 0, 0, 0, 0 };
91 int count; 95 int count;
92 96
103 if (inputbuf[2] != '=') 107 if (inputbuf[2] != '=')
104 *output++ = (inputbuf[1] << 4 & 0xf0) | (inputbuf[2] >> 2 & 0x0f); 108 *output++ = (inputbuf[1] << 4 & 0xf0) | (inputbuf[2] >> 2 & 0x0f);
105 if (inputbuf[3] != '=') 109 if (inputbuf[3] != '=')
106 *output++ = (inputbuf[2] << 6 & 0xc0) | (inputbuf[3] & 0x3f); 110 *output++ = (inputbuf[2] << 6 & 0xc0) | (inputbuf[3] & 0x3f);
107 } 111 }
112
113 return output;
108 } 114 }
109 115
110 /** 116 /**
111 * Encode a string. 117 * Encode a string.
112 * 118 *