//
//??base64.m
//
//??Version?1.1
//
//??Created?by?Nick?Lockwood?on?12/01/2012.
//??Copyright?（C）?2012?Charcoal?Design
//
//??Distributed?under?the?permissive?zlib?License
//??Get?the?latest?version?from?here:
//
//??https://github.com/nicklockwood/base64
//
//??This?software?is?provided?‘as-is‘?without?any?express?or?implied
//??warranty.??In?no?event?will?the?authors?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?software?must?not?be?misrepresented;?you?must?not
//??claim?that?you?wrote?the?original?software.?If?you?use?this?software
//??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?software.
//
//??3.?This?notice?may?not?be?removed?or?altered?from?any?source?distribution.
//

#import?“base64.h“


#import?
#if?!__has_feature（objc_arc）
#error?This?library?requires?automatic?reference?counting
#endif


@implementation?NSData?（base64）

+?（NSData?*）dataWithbase64EncodedString:（NSString?*）string
{
????const?char?lookup[]?=
????{
????????99?99?99?99?99?99?99?99?99?99?99?99?99?99?99?99?
????????99?99?99?99?99?99?99?99?99?99?99?99?99?99?99?99?
????????99?99?99?99?99?99?99?99?99?99?99?62?99?99?99?63?
????????52?53?54?55?56?57?58?59?60?61?99?99?99?99?99?99?
????????99??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?99?99?99?99?99?
????????99?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?99?99?99?99?99
????};
????
????NSData?*inputData?=?[string?dataUsingEncoding:NSASCIIStringEncoding?allowLossyConversion:YES];
????long?long?inputLength?=?[inputData?length];
????const?unsigned?char?*inputBytes?=?[inputData?bytes];
????
????long?long?maxOutputLength?=?（inputLength?/?4?+?1）?*?3;
????NSMutableData?*outputData?=?[NSMutableData?dataWithLength:maxOutputLength];
????unsigned?char?*outputBytes?=?（unsigned?char?*）[outputData?mutableBytes];

????int?accumulator?=?0;
????long?long?outputLength?=?0;
????unsigned?char?accumulated[]?=?{0?0?0?0};
????for?（long?long?i?=?0;?i?????{
????????unsigned?char?decoded?=?lookup[inputBytes[i]?&?0x7F];
????????if?（decoded?!=?99）
????????{
????????????accumulated[accumulator]?=?decoded;
????????????if?（accumulator?==?3）
????????????{
????????????????outputBytes[outputLength++]?=?（accumulated[0]?<>?4）;??
????????????????outputBytes[outputLength++]?=?（accumulated[1]?<>?2）;??
????????????????outputBytes[output

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-02-27?15:14??IOS-RSA\
?????文件????????6148??2014-02-27?15:14??IOS-RSA\.DS_Store
?????目錄???????????0??2014-02-28?13:47??__MACOSX\
?????目錄???????????0??2014-02-28?13:47??__MACOSX\IOS-RSA\
?????文件?????????120??2014-02-27?15:14??__MACOSX\IOS-RSA\._.DS_Store
?????目錄???????????0??2014-02-27?15:10??IOS-RSA\base64\
?????文件????????1641??2013-06-05?14:08??IOS-RSA\base64\base64.h
?????目錄???????????0??2014-02-28?13:47??__MACOSX\IOS-RSA\base64\
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\base64\._base64.h
?????文件????????7010??2013-06-05?14:08??IOS-RSA\base64\base64.m
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\base64\._base64.m
?????目錄???????????0??2014-02-27?15:14??IOS-RSA\RSA\
?????文件????????6148??2014-02-27?15:14??IOS-RSA\RSA\.DS_Store
?????目錄???????????0??2014-02-28?13:47??__MACOSX\IOS-RSA\RSA\
?????文件?????????120??2014-02-27?15:14??__MACOSX\IOS-RSA\RSA\._.DS_Store
?????文件?????????706??2013-06-14?11:50??IOS-RSA\RSA\CRSA.h
?????文件?????????212??2013-06-14?11:50??__MACOSX\IOS-RSA\RSA\._CRSA.h
?????文件????????3548??2013-06-14?11:50??IOS-RSA\RSA\CRSA.m
?????文件?????????212??2013-06-14?11:50??__MACOSX\IOS-RSA\RSA\._CRSA.m
?????目錄???????????0??2013-06-14?11:50??IOS-RSA\RSA\include\
?????文件????????6279??2013-06-05?14:08??IOS-RSA\RSA\include\LICENSE
?????目錄???????????0??2014-02-28?13:47??__MACOSX\IOS-RSA\RSA\include\
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\RSA\include\._LICENSE
?????目錄???????????0??2013-06-14?11:50??IOS-RSA\RSA\include\openssl\
?????文件????????5507??2013-06-05?14:08??IOS-RSA\RSA\include\openssl\aes.h
?????目錄???????????0??2014-02-28?13:47??__MACOSX\IOS-RSA\RSA\include\openssl\
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\RSA\include\openssl\._aes.h
?????文件???????52190??2013-06-05?14:08??IOS-RSA\RSA\include\openssl\asn1.h
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\RSA\include\openssl\._asn1.h
?????文件???????19143??2013-06-05?14:08??IOS-RSA\RSA\include\openssl\asn1_mac.h
?????文件?????????212??2013-06-05?14:08??__MACOSX\IOS-RSA\RSA\include\openssl\._asn1_mac.h
............此處省略155個文件信息