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<div class="headertitle"><div class="title">stream_flags.h File Reference</div></div>
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<p>.xz Stream Header and Stream Footer encoder and decoder
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="nested-classes" name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Options for encoding/decoding Stream Header and Stream Footer. <a href="structlzma__stream__flags.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ada7e0a4f5e7146f547962cb9e9ef08ee"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#ada7e0a4f5e7146f547962cb9e9ef08ee">LZMA_STREAM_HEADER_SIZE</a>   12</td></tr>
<tr class="memdesc:ada7e0a4f5e7146f547962cb9e9ef08ee"><td class="mdescLeft"> </td><td class="mdescRight">Size of Stream Header and Stream Footer. <br /></td></tr>
<tr class="separator:ada7e0a4f5e7146f547962cb9e9ef08ee"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae8da8190f1396f66332073946bc45634"><td class="memItemLeft" align="right" valign="top"><a id="ae8da8190f1396f66332073946bc45634" name="ae8da8190f1396f66332073946bc45634"></a>
#define </td><td class="memItemRight" valign="bottom"><b>LZMA_BACKWARD_SIZE_MIN</b>   4</td></tr>
<tr class="memdesc:ae8da8190f1396f66332073946bc45634"><td class="mdescLeft"> </td><td class="mdescRight">Minimum value for <a class="el" href="structlzma__stream__flags.html#aaa65ed7a55a098f829f04dba25d0f212" title="Backward Size.">lzma_stream_flags.backward_size</a>. <br /></td></tr>
<tr class="separator:ae8da8190f1396f66332073946bc45634"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2e5e09010880f8caa6cd6539c7341239"><td class="memItemLeft" align="right" valign="top"><a id="a2e5e09010880f8caa6cd6539c7341239" name="a2e5e09010880f8caa6cd6539c7341239"></a>
#define </td><td class="memItemRight" valign="bottom"><b>LZMA_BACKWARD_SIZE_MAX</b>   (<a class="el" href="vli_8h.html#a2d8bf5322898bfa11945848420585881">LZMA_VLI_C</a>(1) << 34)</td></tr>
<tr class="memdesc:a2e5e09010880f8caa6cd6539c7341239"><td class="mdescLeft"> </td><td class="mdescRight">Maximum value for <a class="el" href="structlzma__stream__flags.html#aaa65ed7a55a098f829f04dba25d0f212" title="Backward Size.">lzma_stream_flags.backward_size</a>. <br /></td></tr>
<tr class="separator:a2e5e09010880f8caa6cd6539c7341239"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a2ebb8d6dff23daeb3de398913b845eff"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#a2ebb8d6dff23daeb3de398913b845eff">lzma_stream_header_encode</a> (const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *options, uint8_t *out) lzma_nothrow lzma_attr_warn_unused_result</td></tr>
<tr class="memdesc:a2ebb8d6dff23daeb3de398913b845eff"><td class="mdescLeft"> </td><td class="mdescRight">Encode Stream Header. <br /></td></tr>
<tr class="separator:a2ebb8d6dff23daeb3de398913b845eff"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a438249a75ea8da952a7474b92bfe7b7a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#a438249a75ea8da952a7474b92bfe7b7a">lzma_stream_footer_encode</a> (const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *options, uint8_t *out) lzma_nothrow lzma_attr_warn_unused_result</td></tr>
<tr class="memdesc:a438249a75ea8da952a7474b92bfe7b7a"><td class="mdescLeft"> </td><td class="mdescRight">Encode Stream Footer. <br /></td></tr>
<tr class="separator:a438249a75ea8da952a7474b92bfe7b7a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae03198e464f0d296e601ff841e100805"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#ae03198e464f0d296e601ff841e100805">lzma_stream_header_decode</a> (<a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *options, const uint8_t *in) lzma_nothrow lzma_attr_warn_unused_result</td></tr>
<tr class="memdesc:ae03198e464f0d296e601ff841e100805"><td class="mdescLeft"> </td><td class="mdescRight">Decode Stream Header. <br /></td></tr>
<tr class="separator:ae03198e464f0d296e601ff841e100805"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa92a383f85753bb79ee23227fa68186c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#aa92a383f85753bb79ee23227fa68186c">lzma_stream_footer_decode</a> (<a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *options, const uint8_t *in) lzma_nothrow lzma_attr_warn_unused_result</td></tr>
<tr class="memdesc:aa92a383f85753bb79ee23227fa68186c"><td class="mdescLeft"> </td><td class="mdescRight">Decode Stream Footer. <br /></td></tr>
<tr class="separator:aa92a383f85753bb79ee23227fa68186c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3e25ca4205021302882a696283d45263"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="stream__flags_8h.html#a3e25ca4205021302882a696283d45263">lzma_stream_flags_compare</a> (const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *a, const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> *b) lzma_nothrow lzma_attr_pure</td></tr>
<tr class="memdesc:a3e25ca4205021302882a696283d45263"><td class="mdescLeft"> </td><td class="mdescRight">Compare two <a class="el" href="structlzma__stream__flags.html" title="Options for encoding/decoding Stream Header and Stream Footer.">lzma_stream_flags</a> structures. <br /></td></tr>
<tr class="separator:a3e25ca4205021302882a696283d45263"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>.xz Stream Header and Stream Footer encoder and decoder </p>
<dl class="section note"><dt>Note</dt><dd>Never include this file directly. Use <<a class="el" href="lzma_8h.html" title="The public API of liblzma data compression library.">lzma.h</a>> instead. </dd></dl>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ada7e0a4f5e7146f547962cb9e9ef08ee" name="ada7e0a4f5e7146f547962cb9e9ef08ee"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ada7e0a4f5e7146f547962cb9e9ef08ee">◆ </a></span>LZMA_STREAM_HEADER_SIZE</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define LZMA_STREAM_HEADER_SIZE   12</td>
</tr>
</table>
</div><div class="memdoc">
<p>Size of Stream Header and Stream Footer. </p>
<p>Stream Header and Stream Footer have the same size and they are not going to change even if a newer version of the .xz file format is developed in future. </p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="a2ebb8d6dff23daeb3de398913b845eff" name="a2ebb8d6dff23daeb3de398913b845eff"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2ebb8d6dff23daeb3de398913b845eff">◆ </a></span>lzma_stream_header_encode()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> lzma_stream_header_encode </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>options</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>out</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Encode Stream Header. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">options</td><td>Stream Header options to be encoded. options->backward_size is ignored and doesn't need to be initialized. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">out</td><td>Beginning of the output buffer of LZMA_STREAM_HEADER_SIZE bytes.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Possible lzma_ret values:<ul>
<li>LZMA_OK: Encoding was successful.</li>
<li>LZMA_OPTIONS_ERROR: options->version is not supported by this liblzma version.</li>
<li>LZMA_PROG_ERROR: Invalid options. </li>
</ul>
</dd></dl>
</div>
</div>
<a id="a438249a75ea8da952a7474b92bfe7b7a" name="a438249a75ea8da952a7474b92bfe7b7a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a438249a75ea8da952a7474b92bfe7b7a">◆ </a></span>lzma_stream_footer_encode()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> lzma_stream_footer_encode </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>options</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>out</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</table>
</div><div class="memdoc">
<p>Encode Stream Footer. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">options</td><td>Stream Footer options to be encoded. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">out</td><td>Beginning of the output buffer of LZMA_STREAM_HEADER_SIZE bytes.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Possible lzma_ret values:<ul>
<li>LZMA_OK: Encoding was successful.</li>
<li>LZMA_OPTIONS_ERROR: options->version is not supported by this liblzma version.</li>
<li>LZMA_PROG_ERROR: Invalid options. </li>
</ul>
</dd></dl>
</div>
</div>
<a id="ae03198e464f0d296e601ff841e100805" name="ae03198e464f0d296e601ff841e100805"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae03198e464f0d296e601ff841e100805">◆ </a></span>lzma_stream_header_decode()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> lzma_stream_header_decode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>options</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>in</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Decode Stream Header. </p>
<p>options->backward_size is always set to LZMA_VLI_UNKNOWN. This is to help comparing Stream Flags from Stream Header and Stream Footer with <a class="el" href="stream__flags_8h.html#a3e25ca4205021302882a696283d45263" title="Compare two lzma_stream_flags structures.">lzma_stream_flags_compare()</a>.</p>
<dl class="section note"><dt>Note</dt><dd>When decoding .xz files that contain multiple Streams, it may make sense to print "file format not recognized" only if decoding of the Stream Header of the <em>first</em> Stream gives LZMA_FORMAT_ERROR. If non-first Stream Header gives LZMA_FORMAT_ERROR, the message used for LZMA_DATA_ERROR is probably more appropriate. For example, the Stream decoder in liblzma uses LZMA_DATA_ERROR if LZMA_FORMAT_ERROR is returned by <a class="el" href="stream__flags_8h.html#ae03198e464f0d296e601ff841e100805" title="Decode Stream Header.">lzma_stream_header_decode()</a> when decoding non-first Stream.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[out]</td><td class="paramname">options</td><td>Target for the decoded Stream Header options. </td></tr>
<tr><td class="paramdir"></td><td class="paramname">in</td><td>Beginning of the input buffer of LZMA_STREAM_HEADER_SIZE bytes.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Possible lzma_ret values:<ul>
<li>LZMA_OK: Decoding was successful.</li>
<li>LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given buffer cannot be Stream Header.</li>
<li>LZMA_DATA_ERROR: CRC32 doesn't match, thus the header is corrupt.</li>
<li>LZMA_OPTIONS_ERROR: Unsupported options are present in the header. </li>
</ul>
</dd></dl>
</div>
</div>
<a id="aa92a383f85753bb79ee23227fa68186c" name="aa92a383f85753bb79ee23227fa68186c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa92a383f85753bb79ee23227fa68186c">◆ </a></span>lzma_stream_footer_decode()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> lzma_stream_footer_decode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>options</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>in</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Decode Stream Footer. </p>
<dl class="section note"><dt>Note</dt><dd>If Stream Header was already decoded successfully, but decoding Stream Footer returns LZMA_FORMAT_ERROR, the application should probably report some other error message than "file format not recognized". The file likely is corrupt (possibly truncated). The Stream decoder in liblzma uses LZMA_DATA_ERROR in this situation.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[out]</td><td class="paramname">options</td><td>Target for the decoded Stream Footer options. </td></tr>
<tr><td class="paramdir"></td><td class="paramname">in</td><td>Beginning of the input buffer of LZMA_STREAM_HEADER_SIZE bytes.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Possible lzma_ret values:<ul>
<li>LZMA_OK: Decoding was successful.</li>
<li>LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given buffer cannot be Stream Footer.</li>
<li>LZMA_DATA_ERROR: CRC32 doesn't match, thus the Stream Footer is corrupt.</li>
<li>LZMA_OPTIONS_ERROR: Unsupported options are present in Stream Footer. </li>
</ul>
</dd></dl>
</div>
</div>
<a id="a3e25ca4205021302882a696283d45263" name="a3e25ca4205021302882a696283d45263"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3e25ca4205021302882a696283d45263">◆ </a></span>lzma_stream_flags_compare()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="base_8h.html#a8494e0457e1463d6d2b6836018d87b6e">lzma_ret</a> lzma_stream_flags_compare </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>a</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structlzma__stream__flags.html">lzma_stream_flags</a> * </td>
<td class="paramname"><em>b</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Compare two <a class="el" href="structlzma__stream__flags.html" title="Options for encoding/decoding Stream Header and Stream Footer.">lzma_stream_flags</a> structures. </p>
<p>backward_size values are compared only if both are not LZMA_VLI_UNKNOWN.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">a</td><td>Pointer to <a class="el" href="structlzma__stream__flags.html" title="Options for encoding/decoding Stream Header and Stream Footer.">lzma_stream_flags</a> structure </td></tr>
<tr><td class="paramname">b</td><td>Pointer to <a class="el" href="structlzma__stream__flags.html" title="Options for encoding/decoding Stream Header and Stream Footer.">lzma_stream_flags</a> structure</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Possible lzma_ret values:<ul>
<li>LZMA_OK: Both are equal. If either had backward_size set to LZMA_VLI_UNKNOWN, backward_size values were not compared or validated.</li>
<li>LZMA_DATA_ERROR: The structures differ.</li>
<li>LZMA_OPTIONS_ERROR: version in either structure is greater than the maximum supported version (currently zero).</li>
<li>LZMA_PROG_ERROR: Invalid value, e.g. invalid check or backward_size. </li>
</ul>
</dd></dl>
</div>
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