Base64 Encode/Decode Class C++ SourceCode - Base64编码/解码 类 C++ 源码
Base64 Encode/Decode Class C++ SourceCode - Base64编码/解码 类 C++ 源码
1、Base64.h
// Base64.h: interface for the CBase64 class.
//
//
#if !defined(AFX_BASE64_H__CC47C43F_E786_44DA_828F_5B9F2F1B1160__INCLUDED_)
#define AFX_BASE64_H__CC47C43F_E786_44DA_828F_5B9F2F1B1160__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CBase64
{
public:
CBase64();
virtual ~CBase64();
public:
// 将ANSI字符串转成Base64字符串
static CString encode(const CString in_str);
static void encode(LPSTR pIn, DWORD dwInLen, LPSTR pOut, LPDWORD pdwOutLen);
// 将Base64字符串转成ANSI字符串
static CString decode(const CString in_str);
static void decode(LPSTR pIn, DWORD dwInLen, LPSTR pOut, LPDWORD pdwOutLen);
// 将ANSI格式文件转成Base64格式文件
static BOOL encode(const CString cstrSrc, const CString cstrDes);
static BOOL encodeMemMap(LPCTSTR fIn, LPCTSTR fOut);
// 将Base64格式文件转成ANSI格式文件
static BOOL decode(const CString cstrSrc, const CString cstrDes);
static BOOL decodeMemMap(LPCTSTR fIn, LPCTSTR fOut);
static inline PSTR AllocMemBase64(DWORD dwANSILen);
static inline PSTR AllocMemANSI(DWORD dwBase64Len);
static inline void FreeMemBase64(PSTR pBase64);
static inline void FreeMemANSI(PSTR pANSI);
protected:
static inline DWORD CalcANSItoBase64Len(DWORD dwANSILen);
static inline DWORD CalcBase64toANSILen(DWORD dwBase64Len, const CString strBase64End2 = "");
private:
// encode table(编码表)
const static CString _base64_encode_chars;
// decode table(解码表)
const static char _base64_decode_chars[128];
};
#endif // !defined(AFX_BASE64_H__CC47C43F_E786_44DA_828F_5B9F2F1B1160__INCLUDED_)
// Base64.cpp: implementation of the CBase64 class.
//
//
#include "stdafx.h"
#include "Base64.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
2、Base64.cpp
// Base64.cpp: implementation of the CBase64 class.
//
//
#include "stdafx.h"
#include "Base64.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
// Base64.cpp: implementation of the Base64 class.
//
// 作者：王军建
//
// 用途：Base64的编码与解码
//
// 创建日期：2004-06-08
// 修改日期：2005-06-23
//
#include "Base64.h"
#include
//
// Construction/Destruction
//
CBase64::CBase64()
{
}
CBase64::~CBase64()
{
}
//
// 函数: DWORD CalcANSItoBase64Len()
// 功能: 计算ANSI字符串转成Base64字符串需要多少内存
// 参数: dwANSILen ANSI字符串的长度
// 返回值: DWORD Base64字符串的长度
// 日期: [6/23/2005]
//
inline DWORD CBase64::CalcANSItoBase64Len(DWORD dwANSILen)
{
return (dwANSILen%3) ? (dwANSILen+3)/3*4 : dwANSILen/3*4;
}
//
// 函数: DWORD CalcBase64toANSILen()
// 功能: 计算Base64字符串转成ANSI字符串需要多少内存
// 参数: dwANSILen Base64字符串的长度
// strBase64End2 Base64字符串结尾的二个字符串
// 返回值: DWORD ANSI字符串的长度
// 日期: [6/23/2005]
//
inline DWORD CBase64::CalcBase64toANSILen(DWORD dwBase64Len, const CString strBase64End2)
{
//计算'='出现的次数，
int count = 0;
for (int i=0; i>2 ];
out_str += _base64_encode_chars[ (c1&0x3)<<4 ];
out_str += "==";
break;
}
// read the second byte
c2 = in_str[i++];
if ( i==len ) // pad with "="
{
out_str += _base64_encode_chars[ c1>>2 ];
out_str += _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ];
out_str += _base64_encode_chars[ (c2&0xF)<<2 ];
out_str += "=";
break;
}
// read the third byte
c3 = in_str[i++];
// convert into four bytes string
out_str += _base64_encode_chars[ c1>>2 ];
out_str += _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ];
out_str += _base64_encode_chars[ ((c2&0xF)<<2) | ((c3&0xC0)>>6) ];
out_str += _base64_encode_chars[ c3&0x3F ];
}
return out_str;
}
//
// 函数: CString decode()
// 功能: 将Base64字符串转成ANSI字符串
// 参数: in_str Base64字符串
// 返回值: CString ANSI字符串
// 日期: [6/23/2005]
//
CString CBase64::decode(const CString in_str)
{
CString out_str;
char c1, c2, c3, c4;
int i = 0;
int len = in_str.GetLength();
while ( i>4) );
// read the third byte
do {
c3 = in_str[i++];
if ( c3==61 ) // meet with "=", break
return out_str;
c3 = _base64_decode_chars[ c3 ];
} while ( i>2) );
// read the fourth byte
do {
c4 = in_str[i++];
if ( c4==61 ) // meet with "=", break
return out_str;
c4 = _base64_decode_chars[ c4 ];
} while ( i>2 ];
pOut[n++] = _base64_encode_chars[ (c1&0x3)<<4 ];
pOut[n++] = '=';
pOut[n++] = '=';
break;
}
// read the second byte
c2 = pIn[i++];
if ( i==len ) // pad with "="
{
pOut[n++] = _base64_encode_chars[ c1>>2 ];
pOut[n++] = _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ];
pOut[n++] = _base64_encode_chars[ (c2&0xF)<<2 ];
pOut[n++] = '=';
break;
}
// read the third byte
c3 = pIn[i++];
// convert into four bytes string
pOut[n++] = _base64_encode_chars[ c1>>2 ];
pOut[n++] = _base64_encode_chars[ ((c1&0x3)<<4) | ((c2&0xF0)>>4) ];
pOut[n++] = _base64_encode_chars[ ((c2&0xF)<<2) | ((c3&0xC0)>>6) ];
pOut[n++] = _base64_encode_chars[ c3&0x3F ];
}
*pdwOutLen = n;
}
//
// 函数: void decode()
// 功能: 将Base64字符串转成ANSI字符串
// 参数: pIn Base64字符串
// dwInLen Base64字符串的长度
// pOut 放ANSI字符串的内存
// pdwOutLen ANSI字符串的长度
// 返回值: void
// 日期: [6/24/2005]
//
void CBase64::decode(LPSTR pIn, DWORD dwInLen, LPSTR pOut, LPDWORD pdwOutLen)
{
char c1, c2, c3, c4;
int i = 0, n = 0;
int len = dwInLen;
while ( i>4) );
// read the third byte
do {
c3 = pIn[i++];
if ( c3==61 ) // meet with "=", break
goto end; //return;
c3 = _base64_decode_chars[ c3 ];
} while ( i>2) );
// read the fourth byte
do {
c4 = pIn[i++];
if ( c4==61 ) // meet with "=", break
goto end; //return;
c4 = _base64_decode_chars[ c4 ];
} while ( i= 2)
{
SetFilePointer(hIn, -2, NULL, FILE_END);
DWORD result;
ReadFile(hIn, szBuf, 2, &result, NULL);
dwOutLow = CalcBase64toANSILen(dwInLow, szBuf);
}
hInMap = CreateFileMapping(hIn, NULL, PAGE_READONLY,
0, 0, NULL);
pInFile = (LPSTR)MapViewOfFile(hInMap, FILE_MAP_READ, 0, 0, 0);
hOut = CreateFile(fOut, GENERIC_READ|GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
hOutMap = CreateFileMapping(hOut, NULL, PAGE_READWRITE,
0, dwOutLow, NULL);
pOutFile = (LPSTR)MapViewOfFile(hOutMap, FILE_MAP_WRITE, 0, 0, dwOutLow);
//转换
pIn = pInFile;
pOut = pOutFile;
decode(pIn, dwInLow, pOut, &dwOutLen);
UnmapViewOfFile(pOutFile); UnmapViewOfFile(pInFile);
CloseHandle(hOutMap); CloseHandle(hInMap);
CloseHandle(hOut); CloseHandle(hIn);
return TRUE;
}
//
// 函数: BOOL encode()
// 功能: 将ANSI格式文件转成Base64格式文件
// 参数: cstrSrc ANSI格式的文件名
// cstrDes Base64格式的文件名
// 返回值: BOOL TRUE(成功) FALSE(失败)
// 日期: [6/24/2005]
//
BOOL CBase64::encode(const CString cstrSrc, const CString cstrDes)
{
try
{
CFile file(cstrSrc, CFile::modeRead);
CFile desFile(cstrDes, CFile::modeWrite | CFile::modeCreate);
int length = file.GetLength();
while (length>0)
{
int size = 4095; //必须是3的倍数，不然就被'='所烦。解码只要以四的倍数即可
PSTR buffer=NULL;
buffer = new TCHAR[size];
UINT nBytesRead = file.Read(buffer, size);
// 将Base64格式写入文件
PSTR pszBase64 = AllocMemBase64(nBytesRead);
DWORD dwBase64 = 0;
encode(buffer, nBytesRead, pszBase64, &dwBase64);
desFile.Write(pszBase64, dwBase64);
FreeMemBase64(pszBase64);
delete[] buffer;
length -= nBytesRead;
}
}
catch(CFileException *e)
{
// MessageBox(NULL, e->ReportError(), "error", MB_OK);
e->Delete();
return FALSE;
}
return TRUE;
}
//
// 函数: BOOL decode()
// 功能: 将Base64格式文件转成ANSI格式文件
// 参数: cstrSrc Base64格式的文件名
// cstrDes ANSI格式的文件名
// 返回值: BOOL TRUE(成功) FALSE(失败)
// 日期: [6/24/2005]
//
BOOL CBase64::decode(const CString cstrSrc, const CString cstrDes)
{
try
{
CFile file(cstrSrc, CFile::modeRead);
CFile desFile(cstrDes, CFile::modeWrite | CFile::modeCreate);
// 读取ANSI文件放入cstrANSI
int length = file.GetLength();
while (length>0)
{
int size = 4096; //必须是4的倍数
PSTR buffer=NULL;
buffer = new TCHAR[size];
UINT nBytesRead = file.Read(buffer, size);
PSTR pszANSI = AllocMemANSI(nBytesRead);
DWORD dwANSI = 0;
decode(buffer, nBytesRead, pszANSI, &dwANSI);
desFile.Write(pszANSI, dwANSI);
FreeMemANSI(pszANSI);
delete[] buffer;
length -= nBytesRead;
}
}
catch(CFileException *e)
{
// MessageBox(NULL, e->ReportError(), "error", MB_OK);
e->Delete();
return FALSE;
}
return TRUE;
}
3、Downlaod URL
http://community.kingdee.com/images/blogs/files/8329/CSDNBlogDownload/Base64EncodeDecodeClass.rar
4、Announce
This Code is found in internet.