forked from jbagg/QtZeroConf
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/* This file is based on the GLIB utf8 validation functions. The
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* original license text follows. */
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/* gutf8.c - Operations on UTF-8 strings.
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*
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* Copyright (C) 1999 Tom Tromey
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* Copyright (C) 2000 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include "utf8.h"
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#define UNICODE_VALID(Char) \
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((Char) < 0x110000 && \
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(((Char) & 0xFFFFF800) != 0xD800) && \
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((Char) < 0xFDD0 || (Char) > 0xFDEF) && \
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((Char) & 0xFFFE) != 0xFFFE)
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#define CONTINUATION_CHAR \
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do { \
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if ((*(const unsigned char *)p & 0xc0) != 0x80) /* 10xxxxxx */ \
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goto error; \
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val <<= 6; \
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val |= (*(const unsigned char *)p) & 0x3f; \
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} while(0)
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const char *
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avahi_utf8_valid (const char *str)
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{
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unsigned val = 0;
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unsigned min = 0;
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const char *p;
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for (p = str; *p; p++)
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{
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if (*(const unsigned char *)p < 128)
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/* done */;
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else
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{
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if ((*(const unsigned char *)p & 0xe0) == 0xc0) /* 110xxxxx */
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{
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if ( ((*(const unsigned char *)p & 0x1e) == 0))
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goto error;
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p++;
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if ( ((*(const unsigned char *)p & 0xc0) != 0x80)) /* 10xxxxxx */
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goto error;
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}
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else
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{
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if ((*(const unsigned char *)p & 0xf0) == 0xe0) /* 1110xxxx */
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{
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min = (1 << 11);
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val = *(const unsigned char *)p & 0x0f;
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goto TWO_REMAINING;
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}
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else if ((*(const unsigned char *)p & 0xf8) == 0xf0) /* 11110xxx */
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{
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min = (1 << 16);
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val = *(const unsigned char *)p & 0x07;
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}
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else
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goto error;
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p++;
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CONTINUATION_CHAR;
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TWO_REMAINING:
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p++;
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CONTINUATION_CHAR;
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p++;
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CONTINUATION_CHAR;
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if ( (val < min))
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goto error;
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if ( (!UNICODE_VALID(val)))
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goto error;
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}
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continue;
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error:
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return NULL;
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}
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}
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return str;
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}
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