1 files changed, 50 insertions, 0 deletions
diff --git a/resolv/ns_name_compress.c b/resolv/ns_name_compress.c
new file mode 100644
index 0000000000..ade3676cdb
--- /dev/null
+++ b/resolv/ns_name_compress.c
@@ -0,0 +1,50 @@
+/* Compress a DNS domain name in presentation format.
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <arpa/nameser.h>
+#include <shlib-compat.h>
+
+/* Compresses a domain name into wire format, using compression pointers.
+   Returns the number of bytes consumed in DST or -1 (with errno set).
+
+   DNPTRS is an array of pointers to previous compressed names.
+   DNPTRS[0] is a pointer to the beginning of the message.
+
+   The list ends with NULL.  LASTDNPTR is a pointer to the end of the
+   array pointed to by DNPTRS.  Side effect is to update the list of
+   pointers for labels inserted into the message as we compress the
+   name.  If DNPTRS is NULL, we don't try to compress names.  If
+   LASTDNPTR * is NULL, we don't update the list.  */
+int
+___ns_name_compress (const char *src, unsigned char *dst, size_t dstsiz,
+                     const unsigned char **dnptrs,
+                     const unsigned char **lastdnptr)
+{
+  unsigned char tmp[NS_MAXCDNAME];
+
+  if (__ns_name_pton (src, tmp, sizeof tmp) < 0)
+    return -1;
+  return __ns_name_pack (tmp, dst, dstsiz, dnptrs, lastdnptr);
+}
+versioned_symbol (libc, ___ns_name_compress, ns_name_compress, GLIBC_2_34);
+versioned_symbol (libc, ___ns_name_compress, __ns_name_compress,
+                  GLIBC_PRIVATE);
+libc_hidden_ver (___ns_name_compress, __ns_name_compress)
+
+#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
+compat_symbol (libresolv, ___ns_name_compress, ns_name_compress, GLIBC_2_9);
+#endif