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#include "base64.h" |
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#include <iostream> |
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static const std::string base64_chars = |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"abcdefghijklmnopqrstuvwxyz" |
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"0123456789+/"; |
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static inline bool is_base64(unsigned char c) |
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{ |
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return (isalnum(c) || (c == '+') || (c == '/')); |
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} |
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std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) |
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{ |
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std::string ret; |
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int i = 0; |
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int j = 0; |
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unsigned char char_array_3[3]; |
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unsigned char char_array_4[4]; |
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while (in_len--) { |
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char_array_3[i++] = *(bytes_to_encode++); |
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if (i == 3) { |
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char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; |
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char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); |
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char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); |
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char_array_4[3] = char_array_3[2] & 0x3f; |
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for(i = 0; (i <4) ; i++) |
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ret += base64_chars[char_array_4[i]]; |
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i = 0; |
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} |
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} |
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if (i) { |
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for(j = i; j < 3; j++) |
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char_array_3[j] = '\0'; |
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char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; |
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char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); |
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char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); |
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char_array_4[3] = char_array_3[2] & 0x3f; |
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for (j = 0; (j < i + 1); j++) |
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ret += base64_chars[char_array_4[j]]; |
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while((i++ < 3)) |
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ret += '='; |
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} |
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return ret; |
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} |
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std::string base64_decode(std::string const& encoded_string) |
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{ |
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int in_len = encoded_string.size(); |
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int i = 0; |
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int j = 0; |
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int in_ = 0; |
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unsigned char char_array_4[4], char_array_3[3]; |
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std::string ret; |
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while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) { |
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char_array_4[i++] = encoded_string[in_]; |
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in_++; |
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if (i ==4) { |
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for (i = 0; i <4; i++) |
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char_array_4[i] = base64_chars.find(char_array_4[i]); |
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char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); |
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); |
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char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; |
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for (i = 0; (i < 3); i++) |
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ret += char_array_3[i]; |
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i = 0; |
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} |
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} |
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if (i) { |
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for (j = i; j <4; j++) |
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char_array_4[j] = 0; |
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for (j = 0; j <4; j++) |
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char_array_4[j] = base64_chars.find(char_array_4[j]); |
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char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); |
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); |
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char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; |
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for (j = 0; (j < i - 1); j++) ret += char_array_3[j]; |
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} |
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return ret; |
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} |
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