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+/*
+ * Copyright 2014 Chris Young <chris@unsatisfactorysoftware.co.uk>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf 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; version 2 of the License.
+ *
+ * NetSurf 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file
+ * NetSurf international domain name handling (interface).
+ */
+
+#ifndef _NETSURF_UTILS_IDNA_H_
+#define _NETSURF_UTILS_IDNA_H_
+
+/**
+ * Convert a hostname to an ACE version suitable for DNS lookup
+ *
+ * \param host String containing host
+ * \param len Length of host string
+ * \param ace_host Pointer to update with the output
+ * \param ace_len Pointer to update with length of ace_host
+ * \return NSERROR_OK on success, appropriate error otherwise
+ *
+ * If return value != NSERROR_OK, output will be left untouched.
+ */
+nserror idna_encode(const char *host, size_t len, char **ace_host, size_t *ace_len);
+
+
+/**
+ * Convert a hostname from ACE to UTF-8 suitable for display
+ *
+ * \param ace_host String containing host
+ * \param ace_len Length of host string
+ * \param host Pointer to update with the output
+ * \param host_len Pointer to update with length of host
+ * \return NSERROR_OK on success, appropriate error otherwise
+ *
+ * If return value != NSERROR_OK, output will be left untouched.
+ */
+nserror idna_decode(const char *ace_host, size_t ace_len, char **host, size_t *host_len);
+
+#endif
+