pdf2htmlEX/src/base64stream.cc

#include "base64stream.h"

namespace pdf2htmlEX {

using std::ostream;

ostream & base64stream::dumpto(ostream & out)
{
    unsigned char buf[3];
    while(in->read((char*)buf, 3))
    {
        out << base64_encoding[(buf[0] & 0xfc)>>2]
            << base64_encoding[((buf[0] & 0x03)<<4) | ((buf[1] & 0xf0)>>4)]
            << base64_encoding[((buf[1] & 0x0f)<<2) | ((buf[2] & 0xc0)>>6)]
            << base64_encoding[(buf[2] & 0x3f)];
    } 
    auto cnt = in->gcount();
    if(cnt > 0)
    {
        for(int i = cnt; i < 3; ++i)
            buf[i] = 0;

        out << base64_encoding[(buf[0] & 0xfc)>>2]
            << base64_encoding[((buf[0] & 0x03)<<4) | ((buf[1] & 0xf0)>>4)];

        if(cnt > 1)
        {
            out << base64_encoding[(buf[1] & 0x0f)<<2];
        }
        else
        {
            out <<  '=';
        }
        out << '=';
    }

    return out;
}

const char * base64stream::base64_encoding = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

ostream & operator << (ostream & out, base64stream bf) { return bf.dumpto(out); }

} //namespace pdf2htmlEX