From 5c5f7eb7feb16ba2632ad4701d7ef283a3371fec Mon Sep 17 00:00:00 2001
From: dongheng <dongheng@espressif.com>
Date: Fri, 23 Sep 2016 14:53:19 +0800
Subject: [PATCH] components/openssl: add openssl stack object function

---
 .../openssl/include/internal/ssl_stack.h      | 33 +++++++++
 components/openssl/library/ssl_stack.c        | 70 +++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 components/openssl/include/internal/ssl_stack.h
 create mode 100644 components/openssl/library/ssl_stack.c

diff --git a/components/openssl/include/internal/ssl_stack.h b/components/openssl/include/internal/ssl_stack.h
new file mode 100644
index 0000000000..b97015bd95
--- /dev/null
+++ b/components/openssl/include/internal/ssl_stack.h
@@ -0,0 +1,33 @@
+#ifndef _SSL_STACK_H_
+#define _SSL_STACK_H_
+
+#include "ssl_types.h"
+
+/**
+ * @brief create a openssl stack object
+ *
+ * @param c - stack function
+ *
+ * @return openssl stack object point
+ */
+OPENSSL_STACK* OPENSSL_sk_new(OPENSSL_sk_compfunc c);
+
+/**
+ * @brief create a NULL function openssl stack object
+ *
+ * @param none
+ *
+ * @return openssl stack object point
+ */
+OPENSSL_STACK *OPENSSL_sk_new_null(void);
+
+/**
+ * @brief free openssl stack object
+ *
+ * @param openssl stack object point
+ *
+ * @return none
+ */
+void OPENSSL_sk_free(OPENSSL_STACK *stack);
+
+#endif
diff --git a/components/openssl/library/ssl_stack.c b/components/openssl/library/ssl_stack.c
new file mode 100644
index 0000000000..46e6f7efd8
--- /dev/null
+++ b/components/openssl/library/ssl_stack.c
@@ -0,0 +1,70 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "ssl_stack.h"
+#include "ssl_dbg.h"
+#include "ssl_port.h"
+
+#ifndef CONFIG_MIN_NODES
+    #define MIN_NODES 4
+#else
+    #define MIN_NODES CONFIG_MIN_NODES
+#endif
+
+/**
+ * @brief create a openssl stack object
+ */
+OPENSSL_STACK* OPENSSL_sk_new(OPENSSL_sk_compfunc c)
+{
+    OPENSSL_STACK *stack;
+    char **data;
+
+    stack = ssl_malloc(sizeof(OPENSSL_STACK));
+    if (!stack)
+        SSL_RET(failed1);
+
+    data = ssl_malloc(sizeof(*data) * MIN_NODES);
+    if (!data)
+        SSL_RET(failed2);
+
+    stack->data = data;
+    stack->num_alloc = MIN_NODES;
+    stack->c = c;
+
+    return stack;
+
+failed2:
+    ssl_free(stack);
+failed1:
+    return NULL;
+}
+
+/**
+ * @brief create a NULL function openssl stack object
+ */
+OPENSSL_STACK *OPENSSL_sk_new_null(void)
+{
+    return OPENSSL_sk_new((OPENSSL_sk_compfunc)NULL);
+}
+
+/**
+ * @brief free openssl stack object
+ */
+void OPENSSL_sk_free(OPENSSL_STACK *stack)
+{
+    SSL_ASSERT(stack);
+
+    ssl_free(stack->data);
+    ssl_free(stack);
+}