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+/*
+ * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef EVENT2_BUFFER_COMPAT_H_INCLUDED_
+#define EVENT2_BUFFER_COMPAT_H_INCLUDED_
+
+#include <event2/visibility.h>
+
+/** @file event2/buffer_compat.h
+
+	Obsolete and deprecated versions of the functions in buffer.h: provided
+	only for backward compatibility.
+ */
+
+
+/**
+   Obsolete alias for evbuffer_readln(buffer, NULL, EVBUFFER_EOL_ANY).
+
+   @deprecated This function is deprecated because its behavior is not correct
+      for almost any protocol, and also because it's wholly subsumed by
+      evbuffer_readln().
+
+   @param buffer the evbuffer to read from
+   @return pointer to a single line, or NULL if an error occurred
+
+*/
+EVENT2_EXPORT_SYMBOL
+char *evbuffer_readline(struct evbuffer *buffer);
+
+/** Type definition for a callback that is invoked whenever data is added or
+    removed from an evbuffer.
+
+    An evbuffer may have one or more callbacks set at a time.  The order
+    in which they are executed is undefined.
+
+    A callback function may add more callbacks, or remove itself from the
+    list of callbacks, or add or remove data from the buffer.  It may not
+    remove another callback from the list.
+
+    If a callback adds or removes data from the buffer or from another
+    buffer, this can cause a recursive invocation of your callback or
+    other callbacks.  If you ask for an infinite loop, you might just get
+    one: watch out!
+
+    @param buffer the buffer whose size has changed
+    @param old_len the previous length of the buffer
+    @param new_len the current length of the buffer
+    @param arg a pointer to user data
+*/
+typedef void (*evbuffer_cb)(struct evbuffer *buffer, size_t old_len, size_t new_len, void *arg);
+
+/**
+  Replace all callbacks on an evbuffer with a single new callback, or
+  remove them.
+
+  Subsequent calls to evbuffer_setcb() replace callbacks set by previous
+  calls.  Setting the callback to NULL removes any previously set callback.
+
+  @deprecated This function is deprecated because it clears all previous
+     callbacks set on the evbuffer, which can cause confusing behavior if
+     multiple parts of the code all want to add their own callbacks on a
+     buffer.  Instead, use evbuffer_add(), evbuffer_del(), and
+     evbuffer_setflags() to manage your own evbuffer callbacks without
+     interfering with callbacks set by others.
+
+  @param buffer the evbuffer to be monitored
+  @param cb the callback function to invoke when the evbuffer is modified,
+	 or NULL to remove all callbacks.
+  @param cbarg an argument to be provided to the callback function
+  @return 0 if successful, or -1 on error
+ */
+EVENT2_EXPORT_SYMBOL
+int evbuffer_setcb(struct evbuffer *buffer, evbuffer_cb cb, void *cbarg);
+
+
+/**
+  Find a string within an evbuffer.
+
+  @param buffer the evbuffer to be searched
+  @param what the string to be searched for
+  @param len the length of the search string
+  @return a pointer to the beginning of the search string, or NULL if the search failed.
+ */
+EVENT2_EXPORT_SYMBOL
+unsigned char *evbuffer_find(struct evbuffer *buffer, const unsigned char *what, size_t len);
+
+/** deprecated in favor of calling the functions directly */
+#define EVBUFFER_LENGTH(x)	evbuffer_get_length(x)
+/** deprecated in favor of calling the functions directly */
+#define EVBUFFER_DATA(x)	evbuffer_pullup((x), -1)
+
+#endif
+