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utf8html.cpp

/******************************************************************************
 *
 * utf8html -   SWFilter decendant to convert a UTF-8 stream to HTML escapes
 *
 */


#include <stdlib.h>
#include <stdio.h>
#include <utf8html.h>

UTF8HTML::UTF8HTML() {
}


char UTF8HTML::ProcessText(char *text, int maxlen, const SWKey *key, const SWModule *module)
{
        unsigned char *to, *from;
        int len;
        char digit[10];
        unsigned long ch;

        len = strlenw(text) + 2;                                                // shift string to right of buffer
        if (len < maxlen) {
                memmove(&text[maxlen - len], text, len);
                from = (unsigned char*)&text[maxlen - len];
        }
        else    from = (unsigned char*)text;
        // -------------------------------
        for (to = (unsigned char*)text; *from; from++) {
          ch = 0;
          if ((*from & 128) != 128) {
//              if (*from != ' ')
               *to++ = *from;
               continue;
          }
          if ((*from & 128) && ((*from & 64) != 64)) {
            // error
               *from = 'x';
               continue;
          }
          *from <<= 1;
          int subsequent;
          for (subsequent = 1; (*from & 128); subsequent++) {
                *from <<= 1;
               from[subsequent] &= 63;
               ch <<= 6;
               ch |= from[subsequent];
          }
          subsequent--;
          *from <<=1;
          char significantFirstBits = 8 - (2+subsequent);
          
          ch |= (((short)*from) << (((6*subsequent)+significantFirstBits)-8));
          from += subsequent;
          *to++ = '&';
          *to++ = '#';
          sprintf(digit, "%d", ch);
                for (char *dig = digit; *dig; dig++)
                        *to++ = *dig;
                *to++ = ';';
        }
        *to++ = 0;
        *to = 0;
        return 0;
}

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