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#include "ghostxps.h"
/*
* http://tools.ietf.org/html/rfc3629
*/
int xps_utf8_to_ucs(int *p, const char *ss, int n)
{
unsigned char *s = (unsigned char *)ss;
if (s == NULL)
goto bad;
if ((s[0] & 0x80) == 0)
{
*p = (s[0] & 0x7f);
return 1;
}
if ((s[0] & 0xe0) == 0xc0)
{
if (n < 2 || s[1] < 0x80)
goto bad;
*p = (s[0] & 0x1f) << 6;
*p |= (s[1] & 0x3f);
return 2;
}
if ((s[0] & 0xf0) == 0xe0)
{
if (n < 3 || s[1] < 0x80 || s[2] < 0x80)
goto bad;
*p = (s[0] & 0x0f) << 12;
*p |= (s[1] & 0x3f) << 6;
*p |= (s[2] & 0x3f);
return 3;
}
if ((s[0] & 0xf8) == 0xf0)
{
if (n < 4 || s[1] < 0x80 || s[2] < 0x80 || s[3] < 0x80)
goto bad;
*p = (s[0] & 0x07) << 18;
*p |= (s[1] & 0x3f) << 12;
*p |= (s[2] & 0x3f) << 6;
*p |= (s[3] & 0x3f);
return 4;
}
bad:
*p = 0x80;
return 1;
}
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