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

//?靜態成員初始化7-bit?字母表.
CString?Cbase64::m_sbase64Alphabet?=?
_T（?“ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/“?）;

Cbase64::Cbase64（void）
{
}


Cbase64::~Cbase64（void）
{
}

//---------------------------------------------------------------------------
CString?Cbase64::Encode（LPCTSTR?szEncodingint?nSize）
{
	CString?sOutput?=?_T（?““?）;
	int?nNumBits;
	UINT?nDigit;
	int?lp?=?0;

	if（?szEncoding?==?NULL?）
		return?sOutput;

	m_szInput?=?szEncoding;
	m_nInputSize?=?nSize;

	m_nBitsRemaining?=?0;
	nDigit?=?ReadBits（&nNumBits?lp?）;
	while（?nNumBits?>?0?）
	{
		sOutput?+=?m_sbase64Alphabet[?（int）nDigit?];
		nDigit?=?ReadBits（&nNumBits?lp?）;
	}

	while（?sOutput.GetLength（）?%?4?!=?0?）
	{
		sOutput?+=?‘=‘;
	}
	return?sOutput;
}

//---------------------------------------------------------------------------
//?輸出緩沖區大小不小于?3/4?輸入緩沖區大小.?為了簡便它們的大小取為一致.
int?Cbase64::Decode（LPCTSTR?szDecoding?LPTSTR?szOutput）
{
????int?c?lp?=0;
	int?i;
	int?nDigit;
????int?nDecode[?256?];

	ASSERT（?szDecoding?!=?NULL?）;
	ASSERT（?szOutput?!=?NULL?）;
	if（?szOutput?==?NULL?）??	
		return?0;
	
	if（?szDecoding?==?NULL?）
		return?0;

	CString?sInput?=?szDecoding;
	if（?sInput.GetLength（）?==?0?）
		return?0;

	//?建立解碼表.
	for（?int?i?=?0;?i?		nDecode[i]?=?-2;?//?非法數字.
	for（i=0;?i?	{
		nDecode[?m_sbase64Alphabet[?i?]?]?=?i;
		nDecode[?m_sbase64Alphabet[?i?]?|?0x80?]?=?i;?//?忽略8th?bit.
		nDecode[?‘=‘?]?=?-1;?
		nDecode[?‘=‘?|?0x80?]?=?-1;?
????}

	//?清除輸出緩沖區.
	memset（?szOutput?0?sInput.GetLength（）?+?1?）;

	//?對輸入數據進行解碼.
	for（?lp?=?0?i?=?0;?lp?	{
		c?=?sInput[?lp?];
		nDigit?=?nDecode[?c?&?0x7F?];
		if（?nDigit?		{
			return?0;
		}?
		else?if（?nDigit?>=?0?）?
			WriteBits（?nDigit?&?0x3F?szOutput?i?）;
????}	
	return?i;
}

//---------------------------------------------------------------------------
UINT?Cbase64::ReadBits（int?*?pBitsRead?int&?lp）
{
????ULONG?lScratch;
????while（?（?m_nBitsRemaining?		???（?lp?	{
		int?c?=?m_szInput[?lp++?];
????????m_lBitStorage?<<=?8;
????????m_lBitStorage?|=?（c?&?0xff）;
		m_nBitsRemaining?+=?8;
????}

????if（?m_nBitsRemaining?	{
		lScratch?=?m_lBitStorage?<		*pBitsRead?=?m_nBitsRemaining;
		m_nBitsRemaining?=?0;
????}?
	else?
	{
		lScratch?=?m_lBitStorage?>>?（?m_nBitsRemaining?-?6?）;
		*pBitsRead?=?6;
		m_nBitsRemaining?-=?6;
????}

????return?（UINT）lScratch?&?0x3F;
}

//---------------------------------------------------------------------------
void?Cbase64::WriteBits（UINT?nBits?LPTSTR?szOutput?int&?i）
{
	UINT?nScratch;

	m_lBitStorage?=?（m_lBitStorage?<	m_nBitsRemaining?+=?6;
	while（?m_nBitsRemaining?>?7?）?
	{
		nScratch?=?m_lBitStorage?>>?（m_nBitsRemaining?-?8）;
		szOutput[?i++?]?=?nScratch?&?0xFF;
		m_nBitsRemaining?-=?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-10-25?10:50??MailClient\
?????目錄???????????0??2013-10-25?10:50??MailClient\Debug\
?????文件??????219136??2013-10-24?19:46??MailClient\Debug\MailClient.exe
?????文件?????1763972??2013-10-24?19:46??MailClient\Debug\MailClient.ilk
?????文件?????5409792??2013-10-24?19:46??MailClient\Debug\MailClient.pdb
?????目錄???????????0??2013-10-25?10:50??MailClient\MailClient\
?????文件????????3076??2013-10-22?10:05??MailClient\MailClient\base64.cpp
?????文件?????????517??2013-10-22?09:56??MailClient\MailClient\base64.h
?????目錄???????????0??2013-10-25?10:50??MailClient\MailClient\Debug\
?????文件???????20176??2013-10-24?19:33??MailClient\MailClient\Debug\base64.obj
?????文件???????78528??2013-10-24?19:46??MailClient\MailClient\Debug\CL.read.1.tlog
?????文件???????23168??2013-10-24?19:46??MailClient\MailClient\Debug\CL.write.1.tlog
?????文件???????22062??2013-10-14?20:26??MailClient\MailClient\Debug\DAO_ACCESSDlg.obj
?????文件???????73834??2013-10-24?19:33??MailClient\MailClient\Debug\LoginDlg.obj
?????文件?????????667??2013-10-11?13:28??MailClient\MailClient\Debug\MailClient.exe.embed.manifest
?????文件?????????732??2013-10-11?13:28??MailClient\MailClient\Debug\MailClient.exe.embed.manifest.res
?????文件?????????381??2013-10-24?19:46??MailClient\MailClient\Debug\MailClient.exe.intermediate.manifest
?????文件??????????64??2013-10-24?20:04??MailClient\MailClient\Debug\MailClient.lastbuildstate
?????文件????????1047??2013-10-24?20:04??MailClient\MailClient\Debug\MailClient.log
?????文件???????29793??2013-10-24?19:33??MailClient\MailClient\Debug\MailClient.obj
?????文件????34406400??2013-10-24?19:33??MailClient\MailClient\Debug\MailClient.pch
?????文件???????73048??2013-10-24?19:33??MailClient\MailClient\Debug\MailClient.res
?????文件?????????707??2013-10-11?13:27??MailClient\MailClient\Debug\MailClient.vcxprojResolveAssemblyReference1.cache
?????文件???????????0??2013-10-11?13:27??MailClient\MailClient\Debug\MailClient.write.1.tlog
?????文件??????101824??2013-10-24?19:46??MailClient\MailClient\Debug\MailClientDlg.obj
?????文件?????????210??2013-10-11?13:28??MailClient\MailClient\Debug\MailClient_manifest.rc
?????文件???????19843??2013-10-14?21:21??MailClient\MailClient\Debug\MailSmtp.obj
?????文件???????29385??2013-10-24?19:33??MailClient\MailClient\Debug\Pop3.obj
?????文件???????20605??2013-10-24?19:33??MailClient\MailClient\Debug\Smtp.obj
?????文件???????12599??2013-10-24?19:33??MailClient\MailClient\Debug\WSocket.obj
?????文件???????89843??2013-10-24?19:33??MailClient\MailClient\Debug\WriteDlg.obj
............此處省略128個文件信息