/*?
???base64.cpp?and?base64.h

???Copyright?（C）?2004-2008?René?Nyffenegger

???This?source?code?is?provided?‘as-is‘?without?any?express?or?implied
???warranty.?In?no?event?will?the?author?be?held?liable?for?any?damages
???arising?from?the?use?of?this?software.

???Permission?is?granted?to?anyone?to?use?this?software?for?any?purpose
???including?commercial?applications?and?to?alter?it?and?redistribute?it
???freely?subject?to?the?following?restrictions:

???1.?The?origin?of?this?source?code?must?not?be?misrepresented;?you?must?not
??????claim?that?you?wrote?the?original?source?code.?If?you?use?this?source?code
??????in?a?product?an?acknowledgment?in?the?product?documentation?would?be
??????appreciated?but?is?not?required.

???2.?Altered?source?versions?must?be?plainly?marked?as?such?and?must?not?be
??????misrepresented?as?being?the?original?source?code.

???3.?This?notice?may?not?be?removed?or?altered?from?any?source?distribution.

???René?Nyffenegger?rene.nyffenegger@adp-gmbh.ch

*/
#include?“StdAfx.h“
#include?“base64.h“
#include?

static?const?std::string?base64_chars?=?
?????????????“ABCDEFGHIJKLMNOPQRSTUVWXYZ“
?????????????“abcdefghijklmnopqrstuvwxyz“
?????????????“0123456789+/“;


static?inline?bool?is_base64（unsigned?char?c）?{
??return?（isalnum（c）?||?（c?==?‘+‘）?||?（c?==?‘/‘））;
}

std::string?base64_encode（unsigned?char?const*?bytes_to_encode?unsigned?int?in_len）?{
??std::string?ret;
??int?i?=?0;
??int?j?=?0;
??unsigned?char?char_array_3[3];
??unsigned?char?char_array_4[4];

??while?（in_len--）?{
????char_array_3[i++]?=?*（bytes_to_encode++）;
????if?（i?==?3）?{
??????char_array_4[0]?=?（char_array_3[0]?&?0xfc）?>>?2;
??????char_array_4[1]?=?（（char_array_3[0]?&?0x03）?<>?4）;
??????char_array_4[2]?=?（（char_array_3[1]?&?0x0f）?<>?6）;
??????char_array_4[3]?=?char_array_3[2]?&?0x3f;

??????for（i?=?0;?（i?<4）?;?i++）
????????ret?+=?base64_chars[char_array_4[i]];
??????i?=?0;
????}
??}

??if?（i）
??{
????for（j?=?i;?j???????char_array_3[j]?=?‘\0‘;

????char_array_4[0]?=?（char_array_3[0]?&?0xfc）?>>?2;
????char_array_4[1]?=?（（char_array_3[0]?&?0x03）?<>?4）;
????char_array_4[2]?=?（（char_array_3[1]?&?0x0f）?<>?6）;
????char_array_4[3]?=?char_array_3[2]?&?0x3f;

????for?（j?=?0;?（j???????ret?+=?base64_chars[char_array_4[j]];

????while（（i++???????ret?+=?‘=‘;

??}

??return?ret;

}

std::string?base64_decode（std::string?const&?encoded_string）?{
??size_t?in_len?=?encoded_string.size（）;
??int?i?=?0;
??int?j?=?0;
??int?in_?=?0;
??unsigned?char?char_array_4[4]?char_array_3[3];
??std::string?ret;

??while?（in_len--?&&?（?encoded_string[in_]?!=?‘=‘）?&&?is_base64（encoded_string[in_]））?{
????char_array_4[i++]?=?encoded_string[in_];?in_++;
????if?（i?==4）?{
??????for?（i?=?0;?i?<4;?i++）
????????char_array_4[i]?=?base64_chars.find（char_array_4[i]）;

??????char_array_3[0]?=?（char_array_4[0]?<