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/* $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 <inttypes.h>
#include "utf8.h"
static inline int is_unicode_valid(uint32_t ch) {
if (ch >= 0x110000) /* End of unicode space */
return 0;
if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */
return 0;
if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */
return 0;
if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */
return 0;
return 1;
}
static inline int is_continuation_char(uint8_t ch) {
if ((ch & 0xc0) != 0x80) /* 10xxxxxx */
return 0;
return 1;
}
static inline void merge_continuation_char(uint32_t *u_ch, uint8_t ch) {
*u_ch <<= 6;
*u_ch |= ch & 0x3f;
}
const char* pa_utf8_valid (const char *str) {
uint32_t val = 0;
uint32_t min = 0;
const uint8_t *p, *last;
for (p = (uint8_t*)str; *p; p++) {
if (*p < 128)
/* done */;
else {
last = p;
if ((*p & 0xe0) == 0xc0) { /* 110xxxxx two-char seq. */
min = 128;
val = *p & 0x1e;
goto ONE_REMAINING;
} else if ((*p & 0xf0) == 0xe0) { /* 1110xxxx three-char seq.*/
min = (1 << 11);
val = *p & 0x0f;
goto TWO_REMAINING;
} else if ((*p & 0xf8) == 0xf0) { /* 11110xxx four-char seq */
min = (1 << 16);
val = *p & 0x07;
} else
goto error;
p++;
if (!is_continuation_char(*p))
goto error;
merge_continuation_char(&val, *p);
TWO_REMAINING:
p++;
if (!is_continuation_char(*p))
goto error;
merge_continuation_char(&val, *p);
ONE_REMAINING:
p++;
if (!is_continuation_char(*p))
goto error;
merge_continuation_char(&val, *p);
if (val < min)
goto error;
if (!is_unicode_valid(val))
goto error;
}
}
return str;
error:
return NULL;
}
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