与Web交互可用的图片Base64编码

#ifndef ___BASE64_H___

#define ___BASE64_H___

#include <string>

using namespace std;

class CBase64

{

public:

    CBase64();

    ~CBase64();

    /*********************************************************

    * 函数说明：将输入数据进行base64编码

    * 参数说明：[in]pIn        需要进行编码的数据

                [in]uInLen  输入参数的字节数

                [out]strOut 输出的进行base64编码之后的字符串

    * 返回值  ：true处理成功,false失败

    **********************************************************/

    bool static Encode(const unsigned char *pIn, unsigned long uInLen, string& strOut);

    /*********************************************************

    * 函数说明：将输入数据进行base64编码

    * 参数说明：[in]pIn            需要进行编码的数据

                [in]uInLen        输入参数的字节数

                [out]pOut        输出的进行base64编码之后的字符串

                [out]uOutLen    输出的进行base64编码之后的字符串长度

    * 返回值  ：true处理成功,false失败

    **********************************************************/

    bool static Encode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen);

    /*********************************************************

    * 函数说明：将输入数据进行base64解码

    * 参数说明：[in]strIn        需要进行解码的数据

                [out]pOut        输出解码之后的节数数据

                [out]uOutLen    输出的解码之后的字节数长度

    * 返回值  ：true处理成功,false失败

    **********************************************************/

    bool static Decode(const string& strIn, unsigned char *pOut, unsigned long *uOutLen) ;

    /*********************************************************

    * 函数说明：将输入数据进行base64解码

    * 参数说明：[in]strIn        需要进行解码的数据

                [out]pOut        输出解码之后的节数数据

                [out]uOutLen    输出的解码之后的字节数长度

    * 返回值  ：true处理成功,false失败

    **********************************************************/

    bool static Decode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen) ;

};

#endif // ___BASE64_H___

#include "stdafx.h"

/*

 *

 *Base64?

 *

 *

 *

*/

#include "Base64.h"

static const char *g_pCodes =

    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

static const unsigned char g_pMap[] =

{

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , ,  , , , ,  ,

     ,  ,  ,  ,  ,  ,  ,  ,  ,  , , ,

    , , , , ,   ,   ,   ,   ,   ,   ,   ,

      ,   ,   ,  ,  ,  ,  ,  ,  ,  ,  ,  ,

     ,  ,  ,  ,  ,  ,  , , , , , ,

    ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,

     ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,

     ,  ,  , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , , , , , , , , , , ,

    , , ,

};

CBase64::CBase64()

{

}

CBase64::~CBase64()

{

}

bool CBase64::Encode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen)

{

    unsigned long i, len2, leven;

    unsigned char *p;

    if(pOut == NULL || *uOutLen == )

        return false;

    //ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));

    len2 = ((uInLen + ) / ) << ;

    if((*uOutLen) < (len2 + )) return false;

    p = pOut;

    leven =  * (uInLen / );

    for(i = ; i < leven; i += )

    {

        *p++ = g_pCodes[pIn[] >> ];

        *p++ = g_pCodes[((pIn[] & ) << ) + (pIn[] >> )];

        *p++ = g_pCodes[((pIn[] & 0xf) << ) + (pIn[] >> )];

        *p++ = g_pCodes[pIn[] & 0x3f];

        pIn += ;

    }

    if (i < uInLen)

    {

        unsigned char a = pIn[];

        unsigned char b = ((i + ) < uInLen) ? pIn[] : ;

        unsigned char c = ;

        *p++ = g_pCodes[a >> ];

        *p++ = g_pCodes[((a & ) << ) + (b >> )];

        *p++ = ((i + ) < uInLen) ? g_pCodes[((b & 0xf) << ) + (c >> )] : '=';

        *p++ = '=';

    }

    *p = ; // Append NULL byte

    *uOutLen = p - pOut;

    return true;

}

bool CBase64::Encode(const unsigned char *pIn, unsigned long uInLen, string& strOut)

{

    unsigned long i, len2, leven;

    strOut = "";

    //ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));

    len2 = ((uInLen + ) / ) << ;

    //if((*uOutLen) < (len2 + 1)) return false;

    //p = pOut;

    leven =  * (uInLen / );

    for(i = ; i < leven; i += )

    {

        strOut += g_pCodes[pIn[] >> ];

        strOut += g_pCodes[((pIn[] & ) << ) + (pIn[] >> )];

        strOut += g_pCodes[((pIn[] & 0xf) << ) + (pIn[] >> )];

        strOut += g_pCodes[pIn[] & 0x3f];

        pIn += ;

    }

    if (i < uInLen)

    {

        unsigned char a = pIn[];

        unsigned char b = ((i + ) < uInLen) ? pIn[] : ;

        unsigned char c = ;

        strOut += g_pCodes[a >> ];

        strOut += g_pCodes[((a & ) << ) + (b >> )];

        strOut += ((i + ) < uInLen) ? g_pCodes[((b & 0xf) << ) + (c >> )] : '=';

        strOut += '=';

    }

    //*p = 0; // Append NULL byte

    //*uOutLen = p - pOut;

    return true;

}

bool CBase64::Decode(const string& strIn, unsigned char *pOut, unsigned long *uOutLen)

{

    unsigned long t, x, y, z;

    unsigned char c;

    unsigned long g = ;

    //ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));

    for(x = y = z = t = ; x < strIn.length(); x++)

    {

        c = g_pMap[strIn[x]];

        if(c == ) continue;

        if(c == ) { c = ; g--; }

        t = (t << ) | c;

        if(++y == )

        {

            if((z + g) > *uOutLen) { return false; } // Buffer overflow

            pOut[z++] = (unsigned char)((t>>)&);

            if(g > ) pOut[z++] = (unsigned char)((t>>)&);

            if(g > ) pOut[z++] = (unsigned char)(t&);

            y = t = ;

        }

    }

    *uOutLen = z;

    return true;

}