Base-64（2）
2018-01-29 本文已影响0人
bluewind1230
main.cpp:
#include "stdafx.h"
#include "Base64.h"
#include <iostream>
using namespace std;
int main()
{
unsigned long len = 10;
unsigned char pIn[100];
unsigned char pOut[100];
memcpy(pIn, "你好", 5);
string strout;
cout << (char*)pIn << endl;
if (CBase64::Encode(pIn, 4, strout))
cout << strout << endl;
else
cout << "加密失败" << endl;
string stroIn = strout;
cout << stroIn << endl;
memset(pOut, 0, sizeof(pOut));
if (CBase64::Decode(stroIn, pOut, &len))
{
cout << (char *)pOut << endl;
cout << "len=" << strlen((char *)pOut) << endl;
}
else
cout << "解密失败" << endl;
cout << len << endl;
return 0;
}
Base64.cpp:
/*
*
*Base64?
*
*
*
*/
#include "stdafx.h"
#include "Base64.h"
static const char *g_pCodes =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
static const unsigned char g_pMap[256] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 254, 255, 255, 255, 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, 255, 255, 255, 255, 255,
255, 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, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255
};
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 == 0)
return false;
//ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));
len2 = ((uInLen + 2) / 3) << 2;
if ((*uOutLen) < (len2 + 1)) return false;
p = pOut;
leven = 3 * (uInLen / 3);
for (i = 0; i < leven; i += 3)
{
*p++ = g_pCodes[pIn[0] >> 2];
*p++ = g_pCodes[((pIn[0] & 3) << 4) + (pIn[1] >> 4)];
*p++ = g_pCodes[((pIn[1] & 0xf) << 2) + (pIn[2] >> 6)];
*p++ = g_pCodes[pIn[2] & 0x3f];
pIn += 3;
}
if (i < uInLen)
{
unsigned char a = pIn[0];
unsigned char b = ((i + 1) < uInLen) ? pIn[1] : 0;
unsigned char c = 0;
*p++ = g_pCodes[a >> 2];
*p++ = g_pCodes[((a & 3) << 4) + (b >> 4)];
*p++ = ((i + 1) < uInLen) ? g_pCodes[((b & 0xf) << 2) + (c >> 6)] : '=';
*p++ = '=';
}
*p = 0; // 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 + 2) / 3) << 2;
//if((*uOutLen) < (len2 + 1)) return false;
//p = pOut;
leven = 3 * (uInLen / 3);
for (i = 0; i < leven; i += 3)
{
strOut += g_pCodes[pIn[0] >> 2];
strOut += g_pCodes[((pIn[0] & 3) << 4) + (pIn[1] >> 4)];
strOut += g_pCodes[((pIn[1] & 0xf) << 2) + (pIn[2] >> 6)];
strOut += g_pCodes[pIn[2] & 0x3f];
pIn += 3;
}
if (i < uInLen)
{
unsigned char a = pIn[0];
unsigned char b = ((i + 1) < uInLen) ? pIn[1] : 0;
unsigned char c = 0;
strOut += g_pCodes[a >> 2];
strOut += g_pCodes[((a & 3) << 4) + (b >> 4)];
strOut += ((i + 1) < uInLen) ? g_pCodes[((b & 0xf) << 2) + (c >> 6)] : '=';
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 = 3;
//ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));
for (x = y = z = t = 0; x < strIn.length(); x++)
{
c = g_pMap[strIn[x]];
if (c == 255) continue;
if (c == 254) { c = 0; g--; }
t = (t << 6) | c;
if (++y == 4)
{
if ((z + g) > *uOutLen) { return false; } // Buffer overflow
pOut[z++] = (unsigned char)((t >> 16) & 255);
if (g > 1) pOut[z++] = (unsigned char)((t >> 8) & 255);
if (g > 2) pOut[z++] = (unsigned char)(t & 255);
y = t = 0;
}
}
*uOutLen = z;
return true;
}
Base.h:
#pragma once
/**
* (C) Copyright 2009, asiainfo
* @version v1.0
* @author chenli
* @brief base64编码和解码
*
* history:
* <p>chenli 2009-02-17 1.0 build this moudle</p>
*/
#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
* 作 者 ：ChenLi
* 编写时间：2009-02-17
**********************************************************/
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
* 作 者 ：ChenLi
* 编写时间：2009-02-17
**********************************************************/
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
* 作 者 ：ChenLi
* 编写时间：2009-02-17
**********************************************************/
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
* 作 者 ：ChenLi
* 编写时间：2009-02-17
**********************************************************/
bool static Decode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen);
};
#endif // ___BASE64_H___
