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+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef UTIL_H
+#define UTIL_H
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <stdint.h>
+
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#endif /* HAVE_ARPA_INET_H */
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif /* HAVE_NETINET_IN_H */
+
+#ifdef HAVE_ENDIAN_H
+# include <endian.h>
+#endif /* HAVE_ENDIAN_H */
+
+#ifdef HAVE_SYS_ENDIAN_H
+# include <sys/endian.h>
+#endif /* HAVE_SYS_ENDIAN_H */
+
+namespace nghttp3 {
+
+#if defined HAVE_BE64TOH || HAVE_DECL_BE64TOH
+# define nghttp3_ntohl64(N) be64toh(N)
+# define nghttp3_htonl64(N) htobe64(N)
+#else /* !HAVE_BE64TOH */
+# define nghttp3_bswap64(N) \
+ ((uint64_t)(ntohl((uint32_t)(N))) << 32 | ntohl((uint32_t)((N) >> 32)))
+# define nghttp3_ntohl64(N) nghttp3_bswap64(N)
+# define nghttp3_htonl64(N) nghttp3_bswap64(N)
+#endif /* !HAVE_BE64TOH */
+
+} // namespace nghttp3
+
+#endif // UTIL_H