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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<p>Passing data to and from liblzma.
<a href="structlzma__stream.html#details">More...</a></p>
<p><code>#include <base.h></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:a72fdc738c793f07a5c29715aa57802cf"><td class="memItemLeft" align="right" valign="top">const uint8_t * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a72fdc738c793f07a5c29715aa57802cf">next_in</a></td></tr>
<tr class="separator:a72fdc738c793f07a5c29715aa57802cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abb680ecea31910cbda1d7a6ad4f191c0"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#abb680ecea31910cbda1d7a6ad4f191c0">avail_in</a></td></tr>
<tr class="separator:abb680ecea31910cbda1d7a6ad4f191c0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1a411e1755d6185756caefabc3932c7b"><td class="memItemLeft" align="right" valign="top">uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a1a411e1755d6185756caefabc3932c7b">total_in</a></td></tr>
<tr class="separator:a1a411e1755d6185756caefabc3932c7b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a14ee64ed636ddcb775edf87e2b9f42ec"><td class="memItemLeft" align="right" valign="top">uint8_t * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a14ee64ed636ddcb775edf87e2b9f42ec">next_out</a></td></tr>
<tr class="separator:a14ee64ed636ddcb775edf87e2b9f42ec"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5ff28ea4e39148723c19f59811627904"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a5ff28ea4e39148723c19f59811627904">avail_out</a></td></tr>
<tr class="separator:a5ff28ea4e39148723c19f59811627904"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a80d703ffdfd7661e344fe7b61ff737fa"><td class="memItemLeft" align="right" valign="top">uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a80d703ffdfd7661e344fe7b61ff737fa">total_out</a></td></tr>
<tr class="separator:a80d703ffdfd7661e344fe7b61ff737fa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4eb2f3e87e32cc4bea613898b0bd353f"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structlzma__allocator.html">lzma_allocator</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a4eb2f3e87e32cc4bea613898b0bd353f">allocator</a></td></tr>
<tr class="memdesc:a4eb2f3e87e32cc4bea613898b0bd353f"><td class="mdescLeft"> </td><td class="mdescRight">Custom memory allocation functions. <br /></td></tr>
<tr class="separator:a4eb2f3e87e32cc4bea613898b0bd353f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a209da54c2fb5dea40ad011c8408300d0"><td class="memItemLeft" align="right" valign="top"><a class="el" href="base_8h.html#ab1a60127c640135687a5bcc232cec906">lzma_internal</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#a209da54c2fb5dea40ad011c8408300d0">internal</a></td></tr>
<tr class="separator:a209da54c2fb5dea40ad011c8408300d0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af7c43a61f3dfeb0b9c8487b7f275054e"><td class="memItemLeft" align="right" valign="top">uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlzma__stream.html#af7c43a61f3dfeb0b9c8487b7f275054e">seek_pos</a></td></tr>
<tr class="memdesc:af7c43a61f3dfeb0b9c8487b7f275054e"><td class="mdescLeft"> </td><td class="mdescRight">New seek input position for LZMA_SEEK_NEEDED. <br /></td></tr>
<tr class="separator:af7c43a61f3dfeb0b9c8487b7f275054e"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Passing data to and from liblzma. </p>
<p>The <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> structure is used for</p><ul>
<li>passing pointers to input and output buffers to liblzma;</li>
<li>defining custom memory handler functions; and</li>
<li>holding a pointer to coder-specific internal data structures.</li>
</ul>
<p>Typical usage:</p>
<ul>
<li>After allocating <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> (on stack or with malloc()), it must be initialized to LZMA_STREAM_INIT (see LZMA_STREAM_INIT for details).</li>
<li>Initialize a coder to the <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a>, for example by using <a class="el" href="container_8h.html#acbdad999c544872f0f5d242f0d1a4ed4" title="Initialize .xz Stream encoder using a preset number.">lzma_easy_encoder()</a> or <a class="el" href="container_8h.html#a21cbebf2771617bb1e956385cfb353e3" title="Decode .xz, .lzma, and .lz (lzip) files with autodetection.">lzma_auto_decoder()</a>. Some notes:<ul>
<li>In contrast to zlib, strm->next_in and strm->next_out are ignored by all initialization functions, thus it is safe to not initialize them yet.</li>
<li>The initialization functions always set strm->total_in and strm->total_out to zero.</li>
<li>If the initialization function fails, no memory is left allocated that would require freeing with <a class="el" href="base_8h.html#a854ff37464ae1225febf14db1af43308" title="Free memory allocated for the coder data structures.">lzma_end()</a> even if some memory was associated with the <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> structure when the initialization function was called.</li>
</ul>
</li>
<li>Use <a class="el" href="base_8h.html#a28cc09bc422d5ba1e0187c9f2af5d957" title="Encode or decode data.">lzma_code()</a> to do the actual work.</li>
<li>Once the coding has been finished, the existing <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> can be reused. It is OK to reuse <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> with different initialization function without calling <a class="el" href="base_8h.html#a854ff37464ae1225febf14db1af43308" title="Free memory allocated for the coder data structures.">lzma_end()</a> first. Old allocations are automatically freed.</li>
<li>Finally, use <a class="el" href="base_8h.html#a854ff37464ae1225febf14db1af43308" title="Free memory allocated for the coder data structures.">lzma_end()</a> to free the allocated memory. <a class="el" href="base_8h.html#a854ff37464ae1225febf14db1af43308" title="Free memory allocated for the coder data structures.">lzma_end()</a> never frees the <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> structure itself.</li>
</ul>
<p>Application may modify the values of total_in and total_out as it wants. They are updated by liblzma to match the amount of data read and written but aren't used for anything else except as a possible return values from <a class="el" href="base_8h.html#ab6447cd68eeecbd6b88f21daeb8ce751" title="Get progress information.">lzma_get_progress()</a>. </p>
</div><h2 class="groupheader">Field Documentation</h2>
<a id="a72fdc738c793f07a5c29715aa57802cf" name="a72fdc738c793f07a5c29715aa57802cf"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a72fdc738c793f07a5c29715aa57802cf">◆ </a></span>next_in</h2>
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<td class="memname">const uint8_t* lzma_stream::next_in</td>
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<p>Pointer to the next input byte. </p>
</div>
</div>
<a id="abb680ecea31910cbda1d7a6ad4f191c0" name="abb680ecea31910cbda1d7a6ad4f191c0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abb680ecea31910cbda1d7a6ad4f191c0">◆ </a></span>avail_in</h2>
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<td class="memname">size_t lzma_stream::avail_in</td>
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<p>Number of available input bytes in next_in. </p>
</div>
</div>
<a id="a1a411e1755d6185756caefabc3932c7b" name="a1a411e1755d6185756caefabc3932c7b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1a411e1755d6185756caefabc3932c7b">◆ </a></span>total_in</h2>
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<td class="memname">uint64_t lzma_stream::total_in</td>
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<p>Total number of bytes read by liblzma. </p>
</div>
</div>
<a id="a14ee64ed636ddcb775edf87e2b9f42ec" name="a14ee64ed636ddcb775edf87e2b9f42ec"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a14ee64ed636ddcb775edf87e2b9f42ec">◆ </a></span>next_out</h2>
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<td class="memname">uint8_t* lzma_stream::next_out</td>
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<p>Pointer to the next output position. </p>
</div>
</div>
<a id="a5ff28ea4e39148723c19f59811627904" name="a5ff28ea4e39148723c19f59811627904"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5ff28ea4e39148723c19f59811627904">◆ </a></span>avail_out</h2>
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<td class="memname">size_t lzma_stream::avail_out</td>
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<p>Amount of free space in next_out. </p>
</div>
</div>
<a id="a80d703ffdfd7661e344fe7b61ff737fa" name="a80d703ffdfd7661e344fe7b61ff737fa"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a80d703ffdfd7661e344fe7b61ff737fa">◆ </a></span>total_out</h2>
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<td class="memname">uint64_t lzma_stream::total_out</td>
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<p>Total number of bytes written by liblzma. </p>
</div>
</div>
<a id="a4eb2f3e87e32cc4bea613898b0bd353f" name="a4eb2f3e87e32cc4bea613898b0bd353f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4eb2f3e87e32cc4bea613898b0bd353f">◆ </a></span>allocator</h2>
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<td class="memname">const <a class="el" href="structlzma__allocator.html">lzma_allocator</a>* lzma_stream::allocator</td>
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<p>Custom memory allocation functions. </p>
<p>In most cases this is NULL which makes liblzma use the standard malloc() and free().</p>
<dl class="section note"><dt>Note</dt><dd>In 5.0.x this is not a const pointer. </dd></dl>
</div>
</div>
<a id="a209da54c2fb5dea40ad011c8408300d0" name="a209da54c2fb5dea40ad011c8408300d0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a209da54c2fb5dea40ad011c8408300d0">◆ </a></span>internal</h2>
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<td class="memname"><a class="el" href="base_8h.html#ab1a60127c640135687a5bcc232cec906">lzma_internal</a>* lzma_stream::internal</td>
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<p>Internal state is not visible to applications. </p>
</div>
</div>
<a id="af7c43a61f3dfeb0b9c8487b7f275054e" name="af7c43a61f3dfeb0b9c8487b7f275054e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af7c43a61f3dfeb0b9c8487b7f275054e">◆ </a></span>seek_pos</h2>
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<td class="memname">uint64_t lzma_stream::seek_pos</td>
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<p>New seek input position for LZMA_SEEK_NEEDED. </p>
<p>When <a class="el" href="base_8h.html#a28cc09bc422d5ba1e0187c9f2af5d957" title="Encode or decode data.">lzma_code()</a> returns LZMA_SEEK_NEEDED, the new input position needed by liblzma will be available seek_pos. The value is guaranteed to not exceed the file size that was specified when this <a class="el" href="structlzma__stream.html" title="Passing data to and from liblzma.">lzma_stream</a> was initialized.</p>
<p>In all other situations the value of this variable is undefined. </p>
</div>
</div>
<hr/>The documentation for this struct was generated from the following file:<ul>
<li>lzma/<a class="el" href="base_8h.html">base.h</a></li>
</ul>
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