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/******************************************************************************
*
* UTF8UTF16 - SWFilter decendant to convert UTF-8 to UTF-16
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <utf8utf16.h>
UTF8UTF16::UTF8UTF16() {
}
char UTF8UTF16::ProcessText(char *text, int maxlen, const SWKey *key, const SWModule *module)
{
unsigned char *from;
unsigned short *to;
int len;
unsigned long uchar;
unsigned char significantFirstBits, subsequent;
unsigned short schar;
len = strlen(text) + 1; // 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 short*)text; *from; from++) {
uchar = 0;
if ((*from & 128) != 128) {
// if (*from != ' ')
uchar = *from;
}
else if ((*from & 128) && ((*from & 64) != 64)) {
// error, do nothing
continue;
}
else {
*from <<= 1;
for (subsequent = 1; (*from & 128); subsequent++) {
*from <<= 1;
from[subsequent] &= 63;
uchar <<= 6;
uchar |= from[subsequent];
}
subsequent--;
*from <<=1;
significantFirstBits = 8 - (2+subsequent);
uchar |= (((short)*from) << (((6*subsequent)+significantFirstBits)-8));
from += subsequent;
}
if (uchar < 0x1ffff) {
*to++ = (unsigned short)uchar;
}
else {
uchar -= 0x10000;
schar = 0xD800 | (uchar & 0x03ff);
uchar >>= 10;
uchar |= 0xDC00;
*to++ = (unsigned short)schar;
*to++ = (unsigned short)uchar;
}
}
*to = (unsigned short)0;
return 0;
}
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