2012-11-29 09:50:40 +00:00
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/*
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* Base64 Encoding
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*
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* by WangLu
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* 2012.11.29
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*/
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#ifndef BASE64_H__
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#define BASE64_H__
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#include <iostream>
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2012-11-29 10:16:05 +00:00
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namespace pdf2htmlEX {
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2012-11-29 09:50:40 +00:00
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class base64stream
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{
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public:
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base64stream(std::istream & in) : in(&in) { }
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base64stream(std::istream && in) : in(&in) { }
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std::ostream & dumpto(std::ostream & out)
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{
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unsigned char buf[3];
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while(in->read((char*)buf, 3))
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{
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out << base64_encoding[(buf[0] & 0xfc)>>2]
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<< base64_encoding[((buf[0] & 0x03)<<4) | ((buf[1] & 0xf0)>>4)]
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<< base64_encoding[((buf[1] & 0x0f)<<2) | ((buf[2] & 0xc0)>>6)]
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<< base64_encoding[(buf[2] & 0x3f)];
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}
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auto cnt = in->gcount();
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if(cnt > 0)
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{
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for(int i = cnt; i < 3; ++i)
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buf[i] = 0;
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out << base64_encoding[(buf[0] & 0xfc)>>2]
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<< base64_encoding[((buf[0] & 0x03)<<4) | ((buf[1] & 0xf0)>>4)];
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if(cnt > 1)
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{
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out << base64_encoding[(buf[1] & 0x0f)<<2];
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}
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else
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{
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out << '=';
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}
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out << '=';
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}
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return out;
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}
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private:
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std::istream * in;
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static const char * base64_encoding;
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};
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static inline std::ostream & operator << (std::ostream & out, base64stream & bf) { return bf.dumpto(out); }
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static inline std::ostream & operator << (std::ostream & out, base64stream && bf) { return bf.dumpto(out); }
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2012-11-29 10:16:05 +00:00
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} //namespace pdf2htmlEX
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2012-11-29 09:50:40 +00:00
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#endif //BASE64_H__
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