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/******************************************************************************
*
* UTF16UTF8 - SWFilter descendant to convert UTF-16 to UTF-8
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <utf16utf8.h>
SWORD_NAMESPACE_START
UTF16UTF8::UTF16UTF8() {
}
char UTF16UTF8::processText(SWBuf &text, const SWKey *key, const SWModule *module)
{
unsigned short *from;
int len;
unsigned long uchar;
unsigned short schar;
if ((unsigned long)key < 2) // hack, we're en(1)/de(0)ciphering
return -1;
len = 0;
from = (unsigned short*) text.c_str();
while (*from) {
len += 2;
from++;
}
SWBuf orig = text;
from = (unsigned short*)orig.c_str();
// -------------------------------
for (text = ""; *from; from++) {
uchar = 0;
if (*from < 0xD800 || *from > 0xDFFF) {
uchar = *from;
}
else if (*from >= 0xD800 && *from <= 0xDBFF) {
uchar = *from;
schar = *(from+1);
if (uchar < 0xDC00 || uchar > 0xDFFF) {
//error, do nothing
continue;
}
uchar &= 0x03ff;
schar &= 0x03ff;
uchar <<= 10;
uchar |= schar;
uchar += 0x10000;
from++;
}
else {
//error, do nothing
continue;
}
if (uchar < 0x80) {
text += uchar;
}
else if (uchar < 0x800) {
text += 0xc0 | (uchar >> 6);
text += 0x80 | (uchar & 0x3f);
}
else if (uchar < 0x10000) {
text += 0xe0 | (uchar >> 12);
text += 0x80 | (uchar >> 6) & 0x3f;
text += 0x80 | uchar & 0x3f;
}
else if (uchar < 0x200000) {
text += 0xF0 | (uchar >> 18);
text += 0x80 | (uchar >> 12) & 0x3F;
text += 0x80 | (uchar >> 6) & 0x3F;
text += 0x80 | uchar & 0x3F;
}
}
return 0;
}
SWORD_NAMESPACE_END
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