/*
??Copyright?（c）?2005-2009?by?Jakob?Schroeter?
??This?file?is?part?of?the?gloox?library.?http://camaya.net/gloox

??This?software?is?distributed?under?a?license.?The?full?license
??agreement?can?be?found?in?the?file?LICENSE?in?this?distribution.
??This?software?may?not?be?copied?modified?sold?or?distributed
??other?than?expressed?in?the?named?license?agreement.

??This?software?is?distributed?without?any?warranty.
*/
#include?“stdafx.h“
#include?“base64.h“

namespace?gloox
{

??namespace?base64
??{

????static?const?std::string?alphabet64（?“ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/“?）;
????static?const?char?pad?=?‘=‘;
????static?const?char?np??=?（char）std::string::npos;
????static?char?table64vals[]?=
????{
??????62?np?np?np?63?52?53?54?55?56?57?58?59?60?61?np?np?np?np?np
??????np?np??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?np?np?np?np?np?np?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
????};

????inline?char?table64（?unsigned?char?c?）
????{
??????return?（?c??122?）???np?:?table64vals[c-43];
????}

????const?std::string?encode64（?const?std::string&?input?）
????{
??????std::string?encoded;
??????char?c;
??????const?std::string::size_type?length?=?input.length（）;

??????encoded.reserve（?length?*?2?）;

??????for（?std::string::size_type?i?=?0;?i???????{
????????c?=?static_cast（?（?input[i]?>>?2?）?&?0x3f?）;
????????encoded?+=?alphabet64[c];

????????c?=?static_cast（?（?input[i]?<????????if（?++i???????????c?=?static_cast（?c?|?static_cast（?（?input[i]?>>?4?）?&?0x0f?）?）;
????????encoded?+=?alphabet64[c];

????????if（?i?????????{
??????????c?=?static_cast（?（?input[i]?<??????????if（?++i?????????????c?=?static_cast（?c?|?static_cast（?（?input[i]?>>?6?）?&?0x03?）?）;
??????????encoded?+=?alphabet64[c];
????????}
????????else
????????{
??????????++i;
??????????encoded?+=?pad;
????????}

????????if（?i?????????{
??????????c?=?static_cast（?input[i]?&?0x3f?）;
??????????encoded?+=?alphabet64[c];
????????}
????????else
????????{
??????????encoded?+=?pad;
????????}
??????}

??????return?encoded;
????}

????const?std::string?decode64（?const?std::string&?input?）
????{
??????char?c?d;
??????const?std::string::size_type?length?=?input.length（）;
??????std::string?decoded;

??????decoded.reserve（?length?）;

??????for（?std::string::size_type?i?=?0;?i???????{
????????c?=?table64（input[i]）;
????????++i;
????????d?=?table64（input[i]）;
????????c?=?static_cast（?（?c?<>?4?）?&?0x3?）?）;
????????decoded?+=?c;
????????if（?++i?????????{
??????????c?=?input[i];
??????????if（?pad?==?c?）
????????????break;

??????????c?=?table64（input[i]）;
??????????d?=?static_cast（?（?（?d?<