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/******************************************************************************
*
* unicodertf - SWFilter decendant to convert a double byte unicode file
* to RTF tags
*/
#include <stdlib.h>
#include <stdio.h>
#include <unicodertf.h>
SWORD_NAMESPACE_START
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;
}
SWORD_NAMESPACE_END
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