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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>BUF_MEM_new</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <li><a href="#name">NAME</a></li> <li><a href="#synopsis">SYNOPSIS</a></li> <li><a href="#description">DESCRIPTION</a></li> <li><a href="#return_values">RETURN VALUES</a></li> <li><a href="#see_also">SEE ALSO</a></li> <li><a href="#history">HISTORY</a></li> <li><a href="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow, BUF_MEM_grow_clean, BUF_reverse - simple character array structure</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/buffer.h></pre> <pre> BUF_MEM *BUF_MEM_new(void);</pre> <pre> BUF_MEM *BUF_MEM_new_ex(unsigned long flags);</pre> <pre> void BUF_MEM_free(BUF_MEM *a);</pre> <pre> int BUF_MEM_grow(BUF_MEM *str, int len); size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);</pre> <pre> void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The buffer library handles simple character arrays. Buffers are used for various purposes in the library, most notably memory BIOs.</p> <p><code>BUF_MEM_new()</code> allocates a new buffer of zero size.</p> <p><code>BUF_MEM_new_ex()</code> allocates a buffer with the specified flags. The flag <strong>BUF_MEM_FLAG_SECURE</strong> specifies that the <strong>data</strong> pointer should be allocated on the secure heap; see <em>CRYPTO_secure_malloc(3)</em>.</p> <p><code>BUF_MEM_free()</code> frees up an already existing buffer. The data is zeroed before freeing up in case the buffer contains sensitive data.</p> <p><code>BUF_MEM_grow()</code> changes the size of an already existing buffer to <strong>len</strong>. Any data already in the buffer is preserved if it increases in size.</p> <p><code>BUF_MEM_grow_clean()</code> is similar to <code>BUF_MEM_grow()</code> but it sets any free'd or additionally-allocated memory to zero.</p> <p><code>BUF_reverse()</code> reverses <strong>size</strong> bytes at <strong>in</strong> into <strong>out</strong>. If <strong>in</strong> is NULL, the array is reversed in-place.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>BUF_MEM_new()</code> returns the buffer or NULL on error.</p> <p><code>BUF_MEM_free()</code> has no return value.</p> <p><code>BUF_MEM_grow()</code> and <code>BUF_MEM_grow_clean()</code> return zero on error or the new size (i.e., <strong>len</strong>).</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>bio(7)</em>, <em>CRYPTO_secure_malloc(3)</em>.</p> <p> </p> <hr /> <h1><a name="history">HISTORY</a></h1> <p>The <code>BUF_MEM_new_ex()</code> function was added in OpenSSL 1.1.0.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>