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/* Pango
* utils.c:
*
* Copyright (C) 1999 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "utils.h"
#include <iconv.h>
#include <errno.h>
#include <unicode.h>
gboolean
_pango_utf8_iterate (const char *cur, const char **next, GUChar4 *wc_out)
{
const guchar *p = (guchar *)cur;
guchar c = *p;
GUChar4 wc;
gint length;
if ((c & 0x80) == 0)
{
length = 1;
wc = c;
}
else if ((c & 0xc0) == 0x80)
{
return FALSE;
}
else if ((c & 0xe0) == 0xc0)
{
length = 2;
wc = c & 0x1f;
}
else if ((c & 0xf0) == 0xe0)
{
length = 3;
wc = c & 0x0f;
}
else
return FALSE;
p++;
while (--length > 0)
{
if (*p == 0) /* Incomplete character */
{
if (next)
*next = cur;
if (wc_out)
*wc_out = 0;
return TRUE;
}
if ((*p & 0xc0) != 0x80)
return FALSE;
wc <<= 6;
wc |= (*p) & 0x3f;
p++;
}
if (wc_out)
*wc_out = wc;
if (next)
*next = (const char *)p;
return TRUE;
}
int
_pango_utf8_len (const char *str, int limit)
{
const char *cur = str;
const char *next;
int len = 0;
while (*cur)
{
if (!_pango_utf8_iterate (cur, &next, NULL))
return -1;
if (cur == next)
break;
if (limit >= 0 && (next - str) > limit)
return len;
cur = next;
len++;
}
return len;
}
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define UCS2_CHARSET "UNICODELITTLE"
#else
#define UCS2_CHARSET "UNICODE"
#endif
GUChar2 *
_pango_utf8_to_ucs2 (const char *str, int len)
{
iconv_t cd;
char *outbuf, *result;
const char *inbuf;
size_t inbytesleft;
size_t outbytesleft;
gint outlen;
gint count;
cd = iconv_open (UCS2_CHARSET, "UTF-8");
if (cd == (iconv_t)-1)
g_error ("No converter from UTF-8 to " UCS2_CHARSET);
if (len < 0)
len = strlen (str);
outlen = unicode_strlen (str, len) * sizeof(GUChar2);
result = g_malloc (outlen);
inbuf = str;
inbytesleft = len;
outbuf = result;
outbytesleft = outlen;
count = iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
if (count < 0 && (errno != E2BIG))
{
g_free (result);
result = NULL;
}
iconv_close (cd);
return (GUChar2 *)result;
}
/**
* _pango_guchar4_to_utf8:
* @ch: a ISO10646 character code
* @out: output buffer, must have at least 6 bytes of space.
*
* Convert a single character to utf8
*
* Return value: number of bytes written
**/
int
_pango_guchar4_to_utf8 (GUChar4 c, char *outbuf)
{
size_t len = 0;
int first;
int i;
if (c < 0x80)
{
first = 0;
len = 1;
}
else if (c < 0x800)
{
first = 0xc0;
len = 2;
}
else if (c < 0x10000)
{
first = 0xe0;
len = 3;
}
else if (c < 0x200000)
{
first = 0xf0;
len = 4;
}
else if (c < 0x4000000)
{
first = 0xf8;
len = 5;
}
else
{
first = 0xfc;
len = 6;
}
for (i = len - 1; i > 0; --i)
{
outbuf[i] = (c & 0x3f) | 0x80;
c >>= 6;
}
outbuf[0] = c | first;
return len;
}
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