Base64 codec code (cximage class processing)

# Include <string> <br/> using namespace STD; <br/> class zbase64 <br/>{< br/> public: <br/> // encoding <br/> // databyte <br/> // [in] the length of the input data, in bytes <br/> // <br/> string encode (const unsigned char * data, int databyte ); <br/> // decoding <br/> // databyte <br/> // [in] the length of the input data, in bytes <br/> // outbyte <br/> // [out] the length of the output data, in bytes, do not calculate the length of the output data using the return value <br/> string decode (const char * data, int databyte, Int & outbyte); <Br/>}; <br/> # include "stdafx. H "<br/> # include" zbase64.h "<br/> string zbase64: encode (const unsigned char * data, int databyte) <br/> {<br/> // encoding table <br/> const char encodetable [] = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789 + /"; <br/> // return value <br/> string strencode; <br/> unsigned char TMP [4] = {0}; <br/> int linelength = 0; <br/> for (INT I = 0; I <(INT) (databyte/3); I ++) <br/>{< br/> TM P [1] = * Data ++; <br/> TMP [2] = * Data ++; <br/> TMP [3] = * Data ++; <br/> strencode + = encodetable [TMP [1]> 2]; <br/> strencode + = encodetable [(TMP [1] <4) | (TMP [2]> 4) & 0x3f]; <br/> strencode + = encodetable [(TMP [2] <2) | (TMP [3]> 6) & 0x3f]; <br/> strencode + = encodetable [TMP [3] & 0x3f]; <br/> If (linelength + = 4, linelength = 76) {strencode + = "/R/N"; linelength = 0 ;} <br/>}< br/> // encode the remaining data <br/> Int mod = databyte % 3; <br/> If (mod = 1) <br/>{< br/> TMP [1] = * Data ++; <br/> strencode + = encodetable [(TMP [1] & 0xfc)> 2]; <br/> strencode + = encodetable [(TMP [1] & 0x03) <4)]; <br/> strencode + = "= "; <br/>}< br/> else if (mod = 2) <br/>{< br/> TMP [1] = * Data ++; <br/> TMP [2] = * Data ++; <br/> strencode + = encodetable [(TMP [1] & 0xfc)> 2]; <br/> strencode + = encodetable [(TMP [1] & 0x03) <4) | (( TMP [2] & 0xf0)> 4)]; <br/> strencode + = encodetable [(TMP [2] & 0x0f) <2)]; <br/> strencode + = "="; <br/>}</P> <p> return strencode; <br/>}< br/> string zbase64 :: decode (const char * data, int databyte, Int & outbyte) <br/> {<br/> // decoding table <br/> const char decodetable [] = <br/> {<br/> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br/> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br/> 62, // '+' <br/> 0, 0, 0, <br/> 63, // '/' <br/> 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9' <br/> 0, 0, 0, 0, 0, 0, <br/> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, <br/> 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 'a'-'Z' <br/> 0, 0, 0, 0, 0, 0, <br/> 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, <br/> 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // 'a'-'Z' <br/>}; <br/> // return value <br/> string strdecode; <br/> int nvalue; <br/> int I = 0; <br/> while (I <databyte) <br/>{< br/> If (* Data! = '/R' & * Data! = '/N') <br/>{< br/> nvalue = decodetable [* Data ++] <18; <br/> nvalue + = decodetable [* Data ++] <12; <br/> strdecode + = (nvalue & 0x00ff0000)> 16; <br/> outbyte ++; <br/> If (* Data! = ') <Br/>{< br/> nvalue + = decodetable [* Data ++] <6; <br/> strdecode + = (nvalue & 0x0000ff00)> 8; <br/> outbyte ++; <br/> If (* Data! = ') <Br/>{< br/> nvalue + = decodetable [* Data ++]; <br/> strdecode + = nvalue & 0x000000ff; <br/> outbyte ++; <br/>}< br/> I + = 4; <br/>}< br/> else // press enter to wrap the line. <br/>{< br/> data ++; <br/> I ++; <br/>}< br/> return strdecode; <br/>}< br/> example (combined with the cximage Library ): <br/> cstring cscandlg: encodeimage () <br/> {// base64-encoded image <br/> zbase64 zbase; <br/> // image encoding <br/> cximage image; // define a cximage object <br/> image. load (this-> m_strimgpath, cximage_format_jpg); // first load the JPG file and specify the file type. <br/> long size = 0; // obtain the image size <br/> byte * buffer = 0; // buffer for storing image data <br/> image. encode (buffer, size, cximage_format_jpg); // copy the image in the image object to buffer as type data <br/> string strtmpresult = zbase. encode (buffer, size); <br/> cstring result; <br/> result = strtmpresult. c_str (); <br/> return result; <br/>}< br/> void cscandlg: decodeimagedata (cstring strdata) <br/> {// decodes base64 encoded data and displays the original image. <br/> zbase64 zbase; <br/> int outbyte = 0; <br/> string strtmpresult = zbase. decode (strdata, strdata. getlength (), outbyte); <br/> int I, Len = strtmpresult. length (); <br/> byte * buffer = new byte [Len]; <br/> for (I = 0; I <Len; ++ I) <br/>{< br/> buffer [I] = strtmpresult [I]; <br/>}< br/> cximage image (buffer, Len, cximage_format_jpg ); // construct the data in the memory buffer into an image object <br/> Delete [] buffer; <br/> CDC * HDC = m_picture.getdc (); <br/> m_bitmap = image. makebitmap (HDC-> m_hdc); <br/> hbitmap h0ldbmp = m_picture.setbitmap (m_bitmap); <br/> If (h0ldbmp) deleteobject (h0ldbmp ); <br/> If (HDC-> m_hdc) m_picture.releasedc (HDC); <br/> If (m_bitmap) deleteobject (m_bitmap); <br/>}