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-rw-r--r--avahi-common/utf8.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/avahi-common/utf8.c b/avahi-common/utf8.c
new file mode 100644
index 0000000..f52ce55
--- /dev/null
+++ b/avahi-common/utf8.c
@@ -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 *
+avahi_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;
+}