Base64编解码(C++版)
#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,int DataByte); /*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,int DataByte,int& OutByte); };
#include "stdAfx.h" #include "ZBase64.h" string ZBase64::Encode(const unsigned char* Data,int DataByte) { //编码表 const char EncodeTable[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; //返回值 string strEncode; unsigned char Tmp[4]={0}; int LineLength=0; for(int i=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,int DataByte,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, 62, // '+' 0, 0, 0, 63, // '/' 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9' 0, 0, 0, 0, 0, 0, 0, 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, // 'A'-'Z' 0, 0, 0, 0, 0, 0, 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, // 'a'-'z' }; //返回值 string strDecode; int nValue; int i= 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; }
CString CScanDlg::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buffer string strTmpResult=zBase.Encode(buffer,size); CString result; result = strTmpResult.c_str(); return result; }
void CScanDlg::DecodeImageData(CString strData) {//对Base64编码过的数据解码并显示原图片 ZBase64 zBase; int OutByte=0; string strTmpResult=zBase.Decode(strData,strData.GetLength(),OutByte); int i,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); }