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diff --git a/pjlib-util/include/pjlib-util/string.h b/pjlib-util/include/pjlib-util/string.h
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+++ b/pjlib-util/include/pjlib-util/string.h
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+/* $Id: string.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJLIB_UTIL_STRING_H__
+#define __PJLIB_UTIL_STRING_H__
+
+/**
+ * @file string.h
+ * @brief More string functions.
+ */
+
+#include <pj/types.h>
+#include <pjlib-util/scanner.h>
+
+/**
+ * @defgroup PJLIB_UTIL_STRING String Escaping Utilities
+ * @ingroup PJLIB_TEXT
+ * @{
+ */
+
+PJ_BEGIN_DECL
+
+/**
+ * Unescape string. If source string does not contain any escaped
+ * characters, the function would simply return the original string.
+ * Otherwise a new string will be allocated.
+ *
+ * @param pool	    Pool to allocate the string.
+ * @param src	    Source string to unescape.
+ *
+ * @return	    String with no escaped characters.
+ */
+PJ_DECL(pj_str_t) pj_str_unescape( pj_pool_t *pool, const pj_str_t *src);
+
+/**
+ * Unescape string to destination.
+ *
+ * @param dst	    Target string.
+ * @param src	    Source string.
+ *
+ * @return	    Target string.
+ */
+PJ_DECL(pj_str_t*) pj_strcpy_unescape(pj_str_t *dst, const pj_str_t *src);
+
+/**
+ * Copy string to destination while escaping reserved characters, up to
+ * the specified maximum length.
+ *
+ * @param dst	    Target string.
+ * @param src	    Source string.
+ * @param max	    Maximum length to copy to target string.
+ * @param unres	    Unreserved characters, which are allowed to appear 
+ *		    unescaped.
+ *
+ * @return	    The target string if all characters have been copied 
+ *		    successfully, or NULL if there's not enough buffer to
+ *		    escape the strings.
+ */
+PJ_DECL(pj_str_t*) pj_strncpy_escape(pj_str_t *dst, const pj_str_t *src,
+				     pj_ssize_t max, const pj_cis_t *unres);
+
+
+/**
+ * Copy string to destination while escaping reserved characters, up to
+ * the specified maximum length.
+ *
+ * @param dst	    Target string.
+ * @param src	    Source string.
+ * @param max	    Maximum length to copy to target string.
+ * @param unres	    Unreserved characters, which are allowed to appear 
+ *		    unescaped.
+ *
+ * @return	    The length of the destination, or -1 if there's not
+ *		    enough buffer.
+ */
+PJ_DECL(pj_ssize_t) pj_strncpy2_escape(char *dst, const pj_str_t *src,
+				       pj_ssize_t max, const pj_cis_t *unres);
+
+PJ_END_DECL
+
+
+/**
+ * @}
+ */
+
+#endif	/* __PJLIB_UTIL_STRING_H__ */