www.pudn.com > TestSMailer.zip > Base64Helper.cpp

//////////////////////////////////////////////////////////////////////////////// 
// General utilities : Base64 encode/decode helper class 
// 
// Copyright (c) 2003 by Morning 
// http://morningspace.51.net 
// mailto:moyingzz@etang.com 
// 
// Permission to use, copy, modify, distribute and sell this program for any  
// purpose is hereby granted without fee, provided that the above copyright  
// notice appear in all copies and that both that copyright notice and this  
// permission notice appear in supporting documentation. 
// 
// It is provided "as is" without express or implied warranty. 
//////////////////////////////////////////////////////////////////////////////// 
 
#include "Base64Helper.h" 
// 
namespace MUtils { 
 
const std::string Base64Helper::_base64_encode_chars =  
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 
 
const char Base64Helper::_base64_decode_chars[] =  
{ 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, 
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, 
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 
}; 
 
std::string Base64Helper::encode(const std::string in_str) 
{ 
    std::string out_str; 
    unsigned char c1, c2, c3; 
    int i = 0; 
    int len = in_str.length(); 
 
    while ( i>2 ]; 
            out_str += _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ]; 
            out_str += _base64_encode_chars[ (c2&0xF)<<2 ]; 
            out_str += "="; 
            break; 
        } 
 
        // read the third byte 
        c3 = in_str[i++]; 
        // convert into four bytes string 
        out_str += _base64_encode_chars[ c1>>2 ]; 
        out_str += _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ]; 
        out_str += _base64_encode_chars[ ((c2&0xF)<<2) | ((c3&0xC0)>>6) ]; 
        out_str += _base64_encode_chars[ c3&0x3F ]; 
    } 
 
    return out_str; 
} 
 
std::string Base64Helper::decode(const std::string in_str) 
{ 
    std::string out_str; 
    char c1, c2, c3, c4; 
    int i = 0; 
    int len = in_str.length(); 
 
    while ( i>4) ); 
 
        // read the third byte 
        do { 
            c3 = in_str[i++]; 
            if ( c3==61 )       // meet with "=", break 
                return out_str; 
            c3 = _base64_decode_chars[ c3 ]; 
        } while ( i>2) ); 
 
        // read the fourth byte 
        do { 
            c4 = in_str[i++]; 
            if ( c4==61 )       // meet with "=", break 
                return out_str; 
            c4 = _base64_decode_chars[ c4 ]; 
        } while ( i