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unicodertf.cpp

/******************************************************************************
 *
 * unicodertf - SWFilter decendant to convert a double byte unicode file
 *                               to RTF tags
 */


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

UnicodeRTF::UnicodeRTF() {
}


char UnicodeRTF::ProcessText(char *text, int maxlen, const SWKey *key, const SWModule *module)
{
        unsigned char *to, *from, *maxto;
        int len;
        char digit[10];
        short ch;       // must be signed per unicode spec (negative is ok for big numbers > 32768)

        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;
        maxto =(unsigned char*)text + maxlen;

        // -------------------------------
        bool lastUni = false;
        for (to = (unsigned char*)text; *from && (to <= maxto); from++) {
                ch = 0;
                if ((*from & 128) != 128) {
//                      if ((*from == ' ') && (lastUni))
//                              *to++ = ' ';
                        *to++ = *from;
                        lastUni = false;
                        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++ = 'u';
                sprintf(digit, "%d", ch);
                for (char *dig = digit; *dig; dig++)
                        *to++ = *dig;
                *to++ = '?';
                lastUni = true;
        }
           
        if (to != maxto) {
                *to++ = 0;
        }
        *to = 0;
        return 0;
}

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