#include
using namespace std;
const static class CConvert{
public:
static void _enBase64Help(unsigned char chasc[3],unsigned char chuue[4]);
static void _deBase64Help(unsigned char chuue[4],unsigned char chasc[3]);
static string enBase64( const char* inbuf, size_t inbufLen );
static string enBase64( const string &inbuf);
static int deBase64( string src, char* outbuf );
static string deBase64( string src);
};
#include "stdafx.h"
#include "Convert.h"
void CConvert::_enBase64Help(unsigned char chasc[3],unsigned char chuue[4])
{
int i, k=2;
unsigned char t = 0;
for(i=0; i<3; i++)
{
*(chuue+i) = *(chasc+i)>>k;
*(chuue+i) |= t;
t = *(chasc+i)<<(8-k);
t >>= 2;
k += 2;
}
*(chuue+3) = *(chasc+2)&63;
for ( i=0; i<4; i++ ) {
if ( (*(chuue+i)<=128) && (*(chuue+i)<=25) ) {
*(chuue+i) += 65; // 'A'-'Z'
} else if ( (*(chuue+i)>=26) && (*(chuue+i)<=51) ) {
*(chuue+i) += 71; // 'a'-'z'
} else if ( (*(chuue+i)>=52) && (*(chuue+i)<=61) ) {
*(chuue+i) -= 4; // 0-9
} else if ( *(chuue+i)==62 ) {
*(chuue+i) = 43; // +
} else if ( *(chuue+i)==63 ) {
*(chuue+i) = 47; // /
}
}
}
void CConvert::_deBase64Help(unsigned char chuue[4],unsigned char chasc[3]) {
int i,k=2;
unsigned char t=0;
for( i=0; i<4; i++) {
if ( (*(chuue+i)>=65) && (*(chuue+i)<=90))
*(chuue+i) -= 65; // 'A'-'Z' -> 0-25
else if ( (*(chuue+i)>=97)&&(*(chuue+i)<=122) )
*(chuue+i) -= 71; // 'a'-'z' -> 26-51
else if ( (*(chuue+i)>=48)&&(*(chuue+i)<=57) )
*(chuue+i) += 4; // '0'-'9' -> 52-61
else if ( *(chuue+i)==43 )
*(chuue+i) = 62; // + -> 62
else if ( *(chuue+i)==47 )
*(chuue+i) = 63; // / -> 63
else if ( *(chuue+i)==61 )
*(chuue+i) = 0; // = -> 0 Note: 'A'和'='都对应了0
}
for ( i=0; i<3; i++ ) {
*(chasc+i) = *(chuue+i) << k;
k += 2;
t = *(chuue+i+1) >> (8-k);
*(chasc+i) |= t;
}
}
string CConvert::enBase64( const char* inbuf, size_t inbufLen ) {
string outStr;
unsigned char in[8];
unsigned char out[8];
out[4] = 0;
size_t blocks = inbufLen / 3;
for ( size_t i=0; i in[0] = inbuf[i*3]; in[1] = inbuf[i*3+1]; in[2] = inbuf[i*3+2]; _enBase64Help(in,out); outStr += out[0]; outStr += out[1]; outStr += out[2]; outStr += out[3]; } if ( inbufLen % 3 == 1 ) { in[0] = inbuf[inbufLen-1]; in[1] = 0; in[2] = 0; _enBase64Help(in,out); outStr += out[0]; outStr += out[1]; outStr += '='; outStr += '='; } else if ( inbufLen % 3 == 2 ) { in[0] = inbuf[inbufLen-2]; in[1] = inbuf[inbufLen-1]; in[2] = 0; _enBase64Help(in,out); outStr += out[0]; outStr += out[1]; outStr += out[2]; outStr += '='; } return string(outStr); } string CConvert::enBase64( const string &inbuf) { return CConvert::enBase64( inbuf.c_str(), inbuf.size() ); } int CConvert::deBase64( string src, char* outbuf ) { // Break when the incoming base64 coding is wrong if((src.size() % 4 )!= 0 ) { return 0; } unsigned char in[4]; unsigned char out[3]; size_t blocks = src.size()/4; for ( size_t i=0; i in[0] = src[i*4]; in[1] = src[i*4+1]; in[2] = src[i*4+2]; in[3] = src[i*4+3]; _deBase64Help(in,out); outbuf[i*3] = out[0]; outbuf[i*3+1] = out[1]; outbuf[i*3+2] = out[2]; } int length = src.size() / 4 * 3; if ( src[src.size()-1] == '=' ) { length--; if ( src[src.size()-2] == '=' ) { length--; } } return length; } string CConvert::deBase64( s