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<li class="navelem"><a class="el" href="dir_8d855866ba5d436d839c7fc557836cd9.html">libavutil</a></li> </ul>
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<div class="title">hash.h File Reference</div> </div>
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<div class="textblock"><code>#include <stdint.h></code><br/>
</div>
<p><a href="hash_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:aff5173f8837eb3afbd20b52528833d72"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#aff5173f8837eb3afbd20b52528833d72">AV_HASH_MAX_SIZE</a>   64</td></tr>
<tr class="memdesc:aff5173f8837eb3afbd20b52528833d72"><td class="mdescLeft"> </td><td class="mdescRight">Maximum value that av_hash_get_size will currently return. <a href="#aff5173f8837eb3afbd20b52528833d72">More...</a><br/></td></tr>
<tr class="separator:aff5173f8837eb3afbd20b52528833d72"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ad1e018687f3a0e9baf3fb6d3af0dd10b"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#ad1e018687f3a0e9baf3fb6d3af0dd10b">av_hash_alloc</a> (struct AVHashContext **ctx, const char *name)</td></tr>
<tr class="memdesc:ad1e018687f3a0e9baf3fb6d3af0dd10b"><td class="mdescLeft"> </td><td class="mdescRight">Allocate a hash context for the algorithm specified by name. <a href="#ad1e018687f3a0e9baf3fb6d3af0dd10b">More...</a><br/></td></tr>
<tr class="separator:ad1e018687f3a0e9baf3fb6d3af0dd10b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a62537bbcf4cae67bbb33f3fa4f4329bf"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a62537bbcf4cae67bbb33f3fa4f4329bf">av_hash_names</a> (int i)</td></tr>
<tr class="memdesc:a62537bbcf4cae67bbb33f3fa4f4329bf"><td class="mdescLeft"> </td><td class="mdescRight">Get the names of available hash algorithms. <a href="#a62537bbcf4cae67bbb33f3fa4f4329bf">More...</a><br/></td></tr>
<tr class="separator:a62537bbcf4cae67bbb33f3fa4f4329bf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5952d21d5503ac307fbaa5d05a3d93ca"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a5952d21d5503ac307fbaa5d05a3d93ca">av_hash_get_name</a> (const struct AVHashContext *ctx)</td></tr>
<tr class="memdesc:a5952d21d5503ac307fbaa5d05a3d93ca"><td class="mdescLeft"> </td><td class="mdescRight">Get the name of the algorithm corresponding to the given hash context. <a href="#a5952d21d5503ac307fbaa5d05a3d93ca">More...</a><br/></td></tr>
<tr class="separator:a5952d21d5503ac307fbaa5d05a3d93ca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8bf8f94e3ebf73f838d017f83352d880"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a8bf8f94e3ebf73f838d017f83352d880">av_hash_get_size</a> (const struct AVHashContext *ctx)</td></tr>
<tr class="memdesc:a8bf8f94e3ebf73f838d017f83352d880"><td class="mdescLeft"> </td><td class="mdescRight">Get the size of the resulting hash value in bytes. <a href="#a8bf8f94e3ebf73f838d017f83352d880">More...</a><br/></td></tr>
<tr class="separator:a8bf8f94e3ebf73f838d017f83352d880"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a84ef872a731eb5c2637ddcd0f0976bca"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a84ef872a731eb5c2637ddcd0f0976bca">av_hash_init</a> (struct AVHashContext *ctx)</td></tr>
<tr class="memdesc:a84ef872a731eb5c2637ddcd0f0976bca"><td class="mdescLeft"> </td><td class="mdescRight">Initialize or reset a hash context. <a href="#a84ef872a731eb5c2637ddcd0f0976bca">More...</a><br/></td></tr>
<tr class="separator:a84ef872a731eb5c2637ddcd0f0976bca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac6a467ff60cb5080b56e818e7b8adb4a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#ac6a467ff60cb5080b56e818e7b8adb4a">av_hash_update</a> (struct AVHashContext *ctx, const uint8_t *src, int len)</td></tr>
<tr class="memdesc:ac6a467ff60cb5080b56e818e7b8adb4a"><td class="mdescLeft"> </td><td class="mdescRight">Update a hash context with additional data. <a href="#ac6a467ff60cb5080b56e818e7b8adb4a">More...</a><br/></td></tr>
<tr class="separator:ac6a467ff60cb5080b56e818e7b8adb4a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aeff9a69f576f8f94e33a0b43a08baa70"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#aeff9a69f576f8f94e33a0b43a08baa70">av_hash_final</a> (struct AVHashContext *ctx, uint8_t *dst)</td></tr>
<tr class="memdesc:aeff9a69f576f8f94e33a0b43a08baa70"><td class="mdescLeft"> </td><td class="mdescRight">Finalize a hash context and compute the actual hash value. <a href="#aeff9a69f576f8f94e33a0b43a08baa70">More...</a><br/></td></tr>
<tr class="separator:aeff9a69f576f8f94e33a0b43a08baa70"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a65e1a59bf9c2076eda5884e89249af12"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a65e1a59bf9c2076eda5884e89249af12">av_hash_final_bin</a> (struct AVHashContext *ctx, uint8_t *dst, int size)</td></tr>
<tr class="memdesc:a65e1a59bf9c2076eda5884e89249af12"><td class="mdescLeft"> </td><td class="mdescRight">Finalize a hash context and compute the actual hash value. <a href="#a65e1a59bf9c2076eda5884e89249af12">More...</a><br/></td></tr>
<tr class="separator:a65e1a59bf9c2076eda5884e89249af12"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8316ebcbe11caebc88b4c4afc0eef16c"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a8316ebcbe11caebc88b4c4afc0eef16c">av_hash_final_hex</a> (struct AVHashContext *ctx, uint8_t *dst, int size)</td></tr>
<tr class="memdesc:a8316ebcbe11caebc88b4c4afc0eef16c"><td class="mdescLeft"> </td><td class="mdescRight">Finalize a hash context and compute the actual hash value as a hex string. <a href="#a8316ebcbe11caebc88b4c4afc0eef16c">More...</a><br/></td></tr>
<tr class="separator:a8316ebcbe11caebc88b4c4afc0eef16c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2300a29e15fd439bcac2f9bc35b730ca"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a2300a29e15fd439bcac2f9bc35b730ca">av_hash_final_b64</a> (struct AVHashContext *ctx, uint8_t *dst, int size)</td></tr>
<tr class="memdesc:a2300a29e15fd439bcac2f9bc35b730ca"><td class="mdescLeft"> </td><td class="mdescRight">Finalize a hash context and compute the actual hash value as a base64 string. <a href="#a2300a29e15fd439bcac2f9bc35b730ca">More...</a><br/></td></tr>
<tr class="separator:a2300a29e15fd439bcac2f9bc35b730ca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1e8bac529966e9af25f3608d3a1515ab"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hash_8h.html#a1e8bac529966e9af25f3608d3a1515ab">av_hash_freep</a> (struct AVHashContext **ctx)</td></tr>
<tr class="memdesc:a1e8bac529966e9af25f3608d3a1515ab"><td class="mdescLeft"> </td><td class="mdescRight">Free hash context. <a href="#a1e8bac529966e9af25f3608d3a1515ab">More...</a><br/></td></tr>
<tr class="separator:a1e8bac529966e9af25f3608d3a1515ab"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="aff5173f8837eb3afbd20b52528833d72"></a>
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<td class="memname">#define AV_HASH_MAX_SIZE   64</td>
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<p>Maximum value that av_hash_get_size will currently return. </p>
<p>You can use this if you absolutely want or need to use static allocation and are fine with not supporting hashes newly added to libavutil without recompilation. Note that you still need to check against av_hash_get_size, adding new hashes with larger sizes will not be considered an ABI change and should not cause your code to overflow a buffer. </p>
<p>Definition at line <a class="el" href="hash_8h_source.html#l00061">61</a> of file <a class="el" href="hash_8h_source.html">hash.h</a>.</p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ad1e018687f3a0e9baf3fb6d3af0dd10b"></a>
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<td class="memname">int av_hash_alloc </td>
<td>(</td>
<td class="paramtype">struct AVHashContext ** </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Allocate a hash context for the algorithm specified by name. </p>
<dl class="section return"><dt>Returns</dt><dd>>= 0 for success, a negative error code for failure </dd></dl>
<dl class="section note"><dt>Note</dt><dd>The context is not initialized, you must call <a class="el" href="hash_8h.html#a84ef872a731eb5c2637ddcd0f0976bca" title="Initialize or reset a hash context. ">av_hash_init()</a>. </dd></dl>
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<td class="memname">const char* av_hash_names </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>i</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get the names of available hash algorithms. </p>
<p>This function can be used to enumerate the algorithms.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">i</td><td>index of the hash algorithm, starting from 0 </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>a pointer to a static string or NULL if i is out of range </dd></dl>
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<td class="memname">const char* av_hash_get_name </td>
<td>(</td>
<td class="paramtype">const struct AVHashContext * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get the name of the algorithm corresponding to the given hash context. </p>
</div>
</div>
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<td class="memname">int av_hash_get_size </td>
<td>(</td>
<td class="paramtype">const struct AVHashContext * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get the size of the resulting hash value in bytes. </p>
<p>The pointer passed to av_hash_final have space for at least this many bytes. </p>
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<td class="memname">void av_hash_init </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
<td></td>
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<p>Initialize or reset a hash context. </p>
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</div>
<a class="anchor" id="ac6a467ff60cb5080b56e818e7b8adb4a"></a>
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<td class="memname">void av_hash_update </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>len</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Update a hash context with additional data. </p>
</div>
</div>
<a class="anchor" id="aeff9a69f576f8f94e33a0b43a08baa70"></a>
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<td class="memname">void av_hash_final </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>dst</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Finalize a hash context and compute the actual hash value. </p>
</div>
</div>
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<td class="memname">void av_hash_final_bin </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Finalize a hash context and compute the actual hash value. </p>
<p>If size is smaller than the hash size, the hash is truncated; if size is larger, the buffer is padded with 0. </p>
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<td class="memname">void av_hash_final_hex </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Finalize a hash context and compute the actual hash value as a hex string. </p>
<p>The string is always 0-terminated. If size is smaller than 2 * hash_size + 1, the hex string is truncated. </p>
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<td class="memname">void av_hash_final_b64 </td>
<td>(</td>
<td class="paramtype">struct AVHashContext * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>dst</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
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<td>)</td>
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<p>Finalize a hash context and compute the actual hash value as a base64 string. </p>
<p>The string is always 0-terminated. If size is smaller than <a class="el" href="group__lavu__base64.html#gaa79f39ca3f737b662ae6711d2cbecd20" title="Calculate the output size needed to base64-encode x bytes to a null-terminated string. ">AV_BASE64_SIZE(hash_size)</a>, the base64 string is truncated. </p>
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<td class="memname">void av_hash_freep </td>
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<td class="paramtype">struct AVHashContext ** </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>Free hash context. </p>
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