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+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * 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 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 OR CONTRIBUTORS 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
+ *
+ * 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. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#ifndef OPENSSL_HEADER_EX_DATA_H
+#define OPENSSL_HEADER_EX_DATA_H
+
+#include <openssl/base.h>
+
+#include <openssl/stack.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// ex_data is a mechanism for associating arbitrary extra data with objects.
+// For each type of object that supports ex_data, different users can be
+// assigned indexes in which to store their data. Each index has callback
+// functions that are called when an object of that type is freed or
+// duplicated.
+
+
+typedef struct crypto_ex_data_st CRYPTO_EX_DATA;
+
+
+// Type-specific functions.
+//
+// Each type that supports ex_data provides three functions:
+
+#if 0 // Sample
+
+// TYPE_get_ex_new_index allocates a new index for |TYPE|. An optional
+// |free_func| argument may be provided which is called when the owning object
+// is destroyed. See |CRYPTO_EX_free| for details. The |argl| and |argp|
+// arguments are opaque values that are passed to the callback. It returns the
+// new index or a negative number on error.
+OPENSSL_EXPORT int TYPE_get_ex_new_index(long argl, void *argp,
+ CRYPTO_EX_unused *unused,
+ CRYPTO_EX_dup *dup_unused,
+ CRYPTO_EX_free *free_func);
+
+// TYPE_set_ex_data sets an extra data pointer on |t|. The |index| argument
+// should have been returned from a previous call to |TYPE_get_ex_new_index|.
+OPENSSL_EXPORT int TYPE_set_ex_data(TYPE *t, int index, void *arg);
+
+// TYPE_get_ex_data returns an extra data pointer for |t|, or NULL if no such
+// pointer exists. The |index| argument should have been returned from a
+// previous call to |TYPE_get_ex_new_index|.
+OPENSSL_EXPORT void *TYPE_get_ex_data(const TYPE *t, int index);
+
+#endif // Sample
+
+
+// Callback types.
+
+// CRYPTO_EX_free is a callback function that is called when an object of the
+// class with extra data pointers is being destroyed. For example, if this
+// callback has been passed to |SSL_get_ex_new_index| then it may be called each
+// time an |SSL*| is destroyed.
+//
+// The callback is passed the new object (i.e. the |SSL*|) in |parent|. The
+// arguments |argl| and |argp| contain opaque values that were given to
+// |CRYPTO_get_ex_new_index|. The callback should return one on success, but
+// the value is ignored.
+//
+// This callback may be called with a NULL value for |ptr| if |parent| has no
+// value set for this index. However, the callbacks may also be skipped entirely
+// if no extra data pointers are set on |parent| at all.
+typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
+ int index, long argl, void *argp);
+
+
+// Deprecated functions.
+
+// CRYPTO_cleanup_all_ex_data does nothing.
+OPENSSL_EXPORT void CRYPTO_cleanup_all_ex_data(void);
+
+// CRYPTO_EX_dup is a legacy callback function type which is ignored.
+typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,
+ void **from_d, int index, long argl, void *argp);
+
+
+// Private structures.
+
+// CRYPTO_EX_unused is a placeholder for an unused callback. It is aliased to
+// int to ensure non-NULL callers fail to compile rather than fail silently.
+typedef int CRYPTO_EX_unused;
+
+struct crypto_ex_data_st {
+ STACK_OF(void) *sk;
+};
+
+
+#if defined(__cplusplus)
+} // extern C
+#endif
+
+#endif // OPENSSL_HEADER_EX_DATA_H
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