#include "base64.h" /// Needed for base64_encode function const std::string Base64::chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /// Helper for base64_decode function inline bool Base64::is_base64(unsigned char c){ return (isalnum(c) || (c == '+') || (c == '/')); } /// Used to base64 encode data. Input is the plaintext as std::string, output is the encoded data as std::string. /// \param input Plaintext data to encode. /// \returns Base64 encoded data. std::string Base64::encode(std::string const input){ std::string ret; unsigned int in_len = input.size(); char quad[4], triple[3]; unsigned int i, x, n = 3; for (x = 0; x < in_len; x = x + 3){ if ((in_len - x) / 3 == 0){ n = (in_len - x) % 3; } for (i = 0; i < 3; i++){ triple[i] = '0'; } for (i = 0; i < n; i++){ triple[i] = input[x + i]; } quad[0] = chars[(triple[0] & 0xFC) >> 2]; // FC = 11111100 quad[1] = chars[((triple[0] & 0x03) << 4) | ((triple[1] & 0xF0) >> 4)]; // 03 = 11 quad[2] = chars[((triple[1] & 0x0F) << 2) | ((triple[2] & 0xC0) >> 6)]; // 0F = 1111, C0=11110 quad[3] = chars[triple[2] & 0x3F]; // 3F = 111111 if (n < 3){ quad[3] = '='; } if (n < 2){ quad[2] = '='; } for (i = 0; i < 4; i++){ ret += quad[i]; } } return ret; } //base64_encode /// Used to base64 decode data. Input is the encoded data as std::string, output is the plaintext data as std::string. /// \param encoded_string Base64 encoded data to decode. /// \returns Plaintext decoded data. std::string Base64::decode(std::string const& encoded_string){ int in_len = encoded_string.size(); int i = 0; int j = 0; int in_ = 0; unsigned char char_array_4[4], char_array_3[3]; std::string ret; while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])){ char_array_4[i++ ] = encoded_string[in_]; in_++; if (i == 4){ for (i = 0; i < 4; i++){ char_array_4[i] = chars.find(char_array_4[i]); } char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; for (i = 0; (i < 3); i++){ ret += char_array_3[i]; } i = 0; } } if (i){ for (j = i; j < 4; j++){ char_array_4[j] = 0; } for (j = 0; j < 4; j++){ char_array_4[j] = chars.find(char_array_4[j]); } char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; for (j = 0; (j < i - 1); j++) ret += char_array_3[j]; } return ret; }