uuencode.cpp

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/Util/uuencode.cpp,v $
 * $Date: 2003/05/13 18:42:22 $
 *
 Description:
\*____________________________________________________________________________*/
//$SourceTop:$

#include "uuencode.h"

/************************************************************
 *    uuencode/decode functions
 ************************************************************/

//
//  Taken from NCSA HTTP and wwwlib.
//
//  NOTE: These conform to RFC1113, which is slightly different then the Unix
//        uuencode and uudecode!
//

const int pr2six[256]={
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,62,64,64,64,63,
    52,53,54,55,56,57,58,59,60,61,64,64,64,64,64,64,64,0,1,2,3,4,5,6,7,8,9,
    10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,64,64,64,64,64,64,26,27,
    28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64
};

char six2pr[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','+','/'
};


BOOL uudecode(	const char * bufcoded,
				BYTE * pbuffdecoded,
				DWORD  * pcbDecoded )
{
    int nbytesdecoded;
    const char *bufin = bufcoded;
    unsigned char *bufout;
    int nprbytes;

	if ( !pcbDecoded ) return FALSE;

    /* Strip leading whitespace. */
    while(*bufcoded==' ' || *bufcoded == '\t') bufcoded++;

    bufin = bufcoded;
    while(pr2six[*(bufin++)] <= 63);
    nprbytes = bufin - bufcoded - 1;
    nbytesdecoded = ((nprbytes+3)/4) * 3;

    *pcbDecoded = nbytesdecoded;

    bufout = (unsigned char *)( pbuffdecoded );

    bufin = bufcoded;

    while (nprbytes > 0) {
        *(bufout++) =
            (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
        *(bufout++) =
            (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
        *(bufout++) =
            (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
        bufin += 4;
        nprbytes -= 4;
    }

    if( nprbytes & 03 ) {
        if( pr2six[bufin[-2]] > 63 )
            nbytesdecoded -= 2;
        else
            nbytesdecoded -= 1;
    }

	unsigned char *bufend = pbuffdecoded + nbytesdecoded;
    *bufend = 0;

    return TRUE;
}


BOOL uuencode(	BYTE * bufin,
				DWORD  nbytes,
				char * pbuffEncoded )
{
   char *outptr;
   unsigned int i;

   outptr = pbuffEncoded;

   for (i=0; i<nbytes; i += 3) {
      *(outptr++) = six2pr[*bufin >> 2];            /* c1 */
      *(outptr++) = six2pr[((*bufin << 4) & 060) | ((bufin[1] >> 4) & 017)]; /*c2*/
      *(outptr++) = six2pr[((bufin[1] << 2) & 074) | ((bufin[2] >> 6) & 03)];/*c3*/
      *(outptr++) = six2pr[bufin[2] & 077];         /* c4 */

      bufin += 3;
   }

   /* If nbytes was not a multiple of 3, then we have encoded too
    * many characters.  Adjust appropriately.
    */
   if(i == nbytes+1) {
      /* There were only 2 bytes in that last group */
      outptr[-1] = '=';
   } else if(i == nbytes+2) {
      /* There was only 1 byte in that last group */
      outptr[-1] = '=';
      outptr[-2] = '=';
   }

   *outptr = '\0';

   return TRUE;
}