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/******************************************************************************
*
* unicodertf - SWFilter descendant to convert a double byte unicode file
* to RTF tags
*/
#include <stdlib.h>
#include <stdio.h>
#include <unicodertf.h>
#include <swbuf.h>
SWORD_NAMESPACE_START
UnicodeRTF::UnicodeRTF() {
}
char UnicodeRTF::processText(SWBuf &text, const SWKey *key, const SWModule *module)
{
const unsigned char *from;
char digit[10];
unsigned long ch;
signed short utf16;
unsigned char from2[7];
SWBuf orig = text;
from = (const unsigned char *)orig.c_str();
// -------------------------------
for (text = ""; *from; from++) {
ch = 0;
//case: ANSI
if ((*from & 128) != 128) {
text += *from;
continue;
}
//case: Invalid UTF-8 (illegal continuing byte in initial position)
if ((*from & 128) && ((*from & 64) != 64)) {
continue;
}
//case: 2+ byte codepoint
from2[0] = *from;
from2[0] <<= 1;
int subsequent;
for (subsequent = 1; (from2[0] & 128) && (subsequent < 7); subsequent++) {
from2[0] <<= 1;
from2[subsequent] = from[subsequent];
from2[subsequent] &= 63;
ch <<= 6;
ch |= from2[subsequent];
}
subsequent--;
from2[0] <<= 1;
char significantFirstBits = 8 - (2+subsequent);
ch |= (((short)from2[0]) << (((6*subsequent)+significantFirstBits)-8));
from += subsequent;
if (ch < 0x10000) {
utf16 = (signed short)ch;
text += '\\';
text += 'u';
sprintf(digit, "%d", utf16);
text += digit;
text += '?';
}
else {
utf16 = (signed short)((ch - 0x10000) / 0x400 + 0xD800);
text += '\\';
text += 'u';
sprintf(digit, "%d", utf16);
text += digit;
text += '?';
utf16 = (signed short)((ch - 0x10000) % 0x400 + 0xDC00);
text += '\\';
text += 'u';
sprintf(digit, "%d", utf16);
text += digit;
text += '?';
}
}
return 0;
}
SWORD_NAMESPACE_END
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