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add utf8 validity checking API

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@861 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-05-14 16:02:09 +00:00
parent b10f2dc0ae
commit bf52fb93b4
3 changed files with 145 additions and 1 deletions
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115
src/polypcore/utf8.c Normal file
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@ -0,0 +1,115 @@
/* $Id */
/* This file is based on the GLIB utf8 validation functions. The
* original license text follows. */
/* gutf8.c - Operations on UTF-8 strings.
*
* Copyright (C) 1999 Tom Tromey
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include "utf8.h"
#define UNICODE_VALID(Char) \
((Char) < 0x110000 && \
(((Char) & 0xFFFFF800) != 0xD800) && \
((Char) < 0xFDD0 || (Char) > 0xFDEF) && \
((Char) & 0xFFFE) != 0xFFFE)
#define CONTINUATION_CHAR \
do { \
if ((*(const unsigned char *)p & 0xc0) != 0x80) /* 10xxxxxx */ \
goto error; \
val <<= 6; \
val |= (*(const unsigned char *)p) & 0x3f; \
} while(0)
const char *
pa_utf8_valid (const char *str)
{
unsigned val = 0;
unsigned min = 0;
const char *p;
for (p = str; *p; p++)
{
if (*(const unsigned char *)p < 128)
/* done */;
else
{
const char *last;
last = p;
if ((*(const unsigned char *)p & 0xe0) == 0xc0) /* 110xxxxx */
{
if ( ((*(const unsigned char *)p & 0x1e) == 0))
goto error;
p++;
if ( ((*(const unsigned char *)p & 0xc0) != 0x80)) /* 10xxxxxx */
goto error;
}
else
{
if ((*(const unsigned char *)p & 0xf0) == 0xe0) /* 1110xxxx */
{
min = (1 << 11);
val = *(const unsigned char *)p & 0x0f;
goto TWO_REMAINING;
}
else if ((*(const unsigned char *)p & 0xf8) == 0xf0) /* 11110xxx */
{
min = (1 << 16);
val = *(const unsigned char *)p & 0x07;
}
else
goto error;
p++;
CONTINUATION_CHAR;
TWO_REMAINING:
p++;
CONTINUATION_CHAR;
p++;
CONTINUATION_CHAR;
if ( (val < min))
goto error;
if ( (!UNICODE_VALID(val)))
goto error;
}
continue;
error:
return NULL;
}
}
return str;
}