base64编解码

#ifndef _BASE64_INCLUDE__H__#define _BASE64_INCLUDE__H__#include <string.h>//***************************************************************************** ********// 定义Base64编码命名空间：//***************************************************************************** ********namespace stringcoding{static const char_B64_[64]={ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H','I', 'J', 'K', 'L', 'M', 'N', 'O', 'P','Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X','Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f','g', 'h', 'i', 'j', 'k', 'l', 'm', 'n','o', 'p', 'q', 'r', 's', 't', 'u', 'v','w', 'x', 'y', 'z', '0', '1', '2', '3','4', '5', '6', '7', '8', '9', '+', '/'};//--------------------------------------------------//Encodeing://--------------------------------------------------inline void encodetribyte(unsigned char * in,unsigned char * out,intlen){if(len==0) return;inti;unsigned char inbuf[3];memset(inbuf,0,sizeof(unsigned char)*3);for(i=0;i<len;i++){inbuf[i]=in[i];}out[0]=_B64_[ inbuf[0]>>2 ];out[1]=_B64_[ ((inbuf[0]&0x03)<<4)|((inbuf[1]&0xf0)>>4) ];//if(len>1) means len=={2,3}//else means len==1, out[2]='=';out[2]=(len>1?_B64_[ ((inbuf[1]&0x0f)<<2)|((inbuf[2]&0xc0)>>6) ]:'=');//if(len>2) menaslen==3//else means len=={1,2} out[3]='=';out[3]=(len>2?_B64_[ inbuf[2]&0x3f ]:'=');}//--------------------------------------------------//Decoding://--------------------------------------------------inline intdecodetribyte(unsigned char * in, unsigned char * out){inti,j,len;char dec[4];memset(dec,0,sizeof(char)*4);len=3;//Get effective original text char count:if(in[3]=='=') len--;if(in[2]=='=') len--;//Find code according to input charactors:for(i=0;i<64;i++){for(j=0;j<4;j++){if(in[j]==_B64_[i]) dec[j]=i;}}//Re-compose original text code:out[0]=(dec[0]<<2|dec[1]>>4);if(len==1) return 1;out[1]=(dec[1]<<4|dec[2]>>2);if(len==2) return 2;out[2]=(((dec[2]<<6)&0xc0)|dec[3]);return 3;}//Encode input byte stream, please ensure lenghth of out//buffer big enough to hold all codes.//The b64 code array size is 4*(tri-byte blocks in original text).inline int Base64Encode(unsigned char * b64,const unsigned char * input,ULONGstringlen=0) {if(!b64||!input||stringlen<0) return 0;ULONG slen,imax;register unsigned inti,idin,idout;intrd,re,len;slen=(stringlen)?stringlen:strlen((char *)input);if(slen==0) return 0;rd=slen%3;rd=(rd==0)?3:rd;//Maximun tri-byte blocks:imax=(slen+(3-rd))/3-1;for(i=0;i<=imax;i++){idin =i*3;idout=i*4;len=(i==imax)?rd:3;encodetribyte((unsigned char *)&input[idin],&b64[idout],len);}re=(imax+1)*4;b64[re]='\0';return re;}//Decode input byte stream, please ensure lenghth of out//buffer big enough to hold all codes.//The b64 code array size is about 3*(quad-byte blocks in b64 code).inline int Base64Decode(unsigned char * output,const unsigned char * b64,ULONG codelen=0) {if(!output||!b64||codelen<0) return 0;ULONG slen,imax;register unsigned inti,idin,idout;intrd,re,len;slen=(codelen)?codelen:strlen((char *)b64);if(slen<4) return 0;rd=slen%4;if(rd!=0) return 0; //Code error!.imax=slen/4-1;for(i=0;i<=imax;i++){idin =i*4;idout=i*3;len=decodetribyte((unsigned char *)&b64[idin],&output[idout]);}re=(imax*3)+len;output[re]='\0';return re;}//-----------------------------------------------------------------------------------------//--------------------------------------------------// Convert CString to char * string// Return string length://--------------------------------------------------inline unsigned char * CString2Char(constCString&str,int& converted){UINT len;DWORD error;unsigned char * buf=0;if(str==L"") return 0;len=str.GetLength()*sizeof(TCHAR)/sizeof(unsigned char)+1;buf=new unsigned char[len];memset(buf,0,sizeof(unsigned char)*len);converted=WideCharToMultiByte(CP_ACP,0,str,str.GetLength(),(char *)buf,len,0,0);if(converted==0){error=GetLastError();}return buf;}//----------------------------------------// 对CString字符串进行base64编码，// 编码后字符串变长大约1/3：//----------------------------------------inline CStringStringBase64Encode(CString& text){CStringdest;unsigned char * bufchar=0,* buf64=0;UINT sz,bytes;//............................................// Convert text (Unicode) to UTF-8://............................................//A. Get buffer size when converted to UTF-8.// Remember to add one byte to hold '\0':bytes=WideCharToMultiByte(CP_UTF8,0,text.GetBuffer(),text.GetLength(),NULL,0,0,0); //B. Convert string to UTF-8 format:sz=bytes+1;bufchar=new unsigned char[sz];memset(bufchar,0,sizeof(unsigned char)*sz);WideCharToMultiByte(CP_UTF8,0,text.GetBuffer(),text.GetLength(),(char*)bufchar,bytes,0,0);//............................................// Convert UTF-8 to base64 code://............................................sz=(bytes+(3-bytes%3))/3*4+1;buf64=new unsigned char[sz]; //Multiply 2 to avoid memory overflow.memset(buf64,0,sizeof(unsigned char)*sz);Base64Encode(buf64,bufchar);//Convert to Base64 code.dest=buf64; //Get base64 code//............................................// Delete pointers and return://............................................if(bufchar)delete [] bufchar;if(buf64)delete [] buf64;return dest;}//----------------------------------------// 对CString字符串进行base64解码：// 解码后字符串变短大约1/4：//----------------------------------------inline CString StringBase64Decode(CString& base64code){CStringdest;unsigned char * buf64=0, * bufu8=0;wchar_t * bufchar=0;UINT sz;int u8len;//............................................//Convert base64 code from Unicode to char://............................................buf64=CString2Char(base64code,(int&)u8len);if(buf64==0){delete [] buf64;return L"";}//............................................//Decode base64 code, we obtain string in// UTF-8 format://............................................bufu8=new unsigned char[u8len*2]; //When decoding, string size will decrease, //therefore size of bufu8 is the same as//that of buf64.memset(bufu8,0,sizeof(unsigned char)*u8len*2);Base64Decode(bufu8,buf64,u8len);//............................................// Convert UTF-8 to original text (Unicode)://............................................//A. Get buffer size when converted to text:sz=MultiByteToWideChar(CP_UTF8,0,(char *)bufu8,u8len,NULL,0);//B. Decode string to original text:bufchar=new wchar_t[sz];memset(bufchar,0,sizeof(wchar_t)*sz);MultiByteToWideChar(CP_UTF8,0,(char *)bufu8,u8len,bufchar,sz);dest=bufchar;//Get original textif(buf64)delete [] buf64;if(bufu8)delete [] bufu8;if(bufchar)delete [] bufchar;return dest;}//***************************************************************************** ********// Base64编码命名空间结束//***************************************************************************** ********};#endif // #ifndef _BASE64_INCLUDE__H__#include <string>using namespace std;class ZBase64{public:/*编码DataByte[in]输入的数据长度,以字节为单位*/string Encode(const unsigned char* Data,intDataByte);/*解码DataByte[in]输入的数据长度,以字节为单位OutByte[out]输出的数据长度,以字节为单位,请不要通过返回值计算输出数据的长度*/string Decode(const char* Data,intDataByte,int&OutByte);};#include "stdAfx.h"#include "ZBase64.h"string ZBase64::Encode(const unsigned char* Data,intDataByte){//编码表const char EncodeTable[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//返回值string strEncode;unsigned char Tmp[4]={0};intLineLength=0;for(inti=0;i<(int)(DataByte / 3);i++){Tmp[1] = *Data++;Tmp[2] = *Data++;Tmp[3] = *Data++;strEncode+= EncodeTable[Tmp[1] >> 2];strEncode+= EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F];strEncode+= EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F];strEncode+= EncodeTable[Tmp[3] & 0x3F];if(LineLength+=4,LineLength==76) {strEncode+="\r\n";LineLength=0;} }//对剩余数据进行编码int Mod=DataByte % 3;if(Mod==1){Tmp[1] = *Data++;strEncode+= EncodeTable[(Tmp[1] & 0xFC) >> 2];strEncode+= EncodeTable[((Tmp[1] & 0x03) << 4)];strEncode+= "==";}else if(Mod==2){Tmp[1] = *Data++;Tmp[2] = *Data++;strEncode+= EncodeTable[(Tmp[1] & 0xFC) >> 2];strEncode+= EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)]; strEncode+= EncodeTable[((Tmp[2] & 0x0F) << 2)];strEncode+= "=";}return strEncode;}string ZBase64::Decode(const char* Data,intDataByte,int&OutByte){//解码表const char DecodeTable[] ={, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,, // '+', 0, 0,, // '/', 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9', 0, 0, 0, 0, 0, 0,, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 'A'-'Z', 0, 0, 0, 0, 0,, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // 'a'-'z'};//返回值string strDecode;intnValue;inti= 0;while (i<DataByte){if (*Data != '\r' && *Data!='\n'){nValue = DecodeTable[*Data++] << 18;nValue += DecodeTable[*Data++] << 12;strDecode+=(nValue& 0x00FF0000) >> 16;OutByte++;if (*Data != '='){nValue += DecodeTable[*Data++] << 6;strDecode+=(nValue& 0x0000FF00) >> 8;OutByte++;if (*Data != '='){nValue += DecodeTable[*Data++];strDecode+=nValue& 0x000000FF;OutByte++;}}i += 4;}else// 回车换行,跳过{Data++;i++;}}return strDecode;}CStringCScanDlg::EncodeImage(){//对图片进行Base64编码ZBase64 zBase;//图片编码CxImage image; // 定义一个CxImage对象image.Load(this->m_strImgPath, CXIMAGE_FORMAT_JPG); //先装载jpg文件,需要指定文件类型long size=0;//得到图像大小BYTE* buffer=0;//存储图像数据的缓冲image.Encode(buffer,size,CXIMAGE_FORMAT_JPG);//把image对象中的图像以type类型数据copy到bufferstring strTmpResult=zBase.Encode(buffer,size);CString result;result = strTmpResult.c_str();return result;}void CScanDlg::DecodeImageData(CStringstrData){//对Base64编码过的数据解码并显示原图片ZBase64 zBase;intOutByte=0;string strTmpResult=zBase.Decode(strData,strData.GetLength(),OutByte);inti,len = strTmpResult.length();BYTE *buffer = new BYTE[len];for (i=0;i<len;++i){buffer[i] = strTmpResult[i];}CxImage image(buffer,len,CXIMAGE_FORMAT_JPG);//把内存缓冲buffer中的数据构造成Image 对象delete [] buffer;CDC* hdc = m_picture.GetDC();m_bitmap = image.MakeBitmap(hdc->m_hDC);HBITMAP h0ldBmp = m_picture.SetBitmap(m_bitmap);if(h0ldBmp) DeleteObject(h0ldBmp);if(hdc->m_hDC) m_picture.ReleaseDC(hdc);if(m_bitmap) DeleteObject(m_bitmap);}#ifndef ___BASE64_H___#define ___BASE64_H___#include <string>using namespace std;class CBase64{public:CBase64();~CBase64();bool static Encode(const unsigned char *pIn, unsigned long uInLen, string&strOut);bool static Encode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen);bool static Decode(const string&strIn, unsigned char *pOut, unsigned long *uOutLen) ;bool static Decode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen) ;};#endif // ___BASE64_H___#include "StdAfx.h"#include "CBase64.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 overflowpOut[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;}// BASE64.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "CBase64.h"#include <iostream>using namespace std;int main(intargc, char* argv[]){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;elsecout<<"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; }elsecout<<"解密失败"<<endl;cout<<len<<endl;return 0;}。