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  <div class="headertitle"><div class="title">data.h File Reference</div></div>
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<p>On-disk layout structures for data-bearing and geometry blocks.  
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;stdint.h&gt;</code><br />
</div>
<p><a href="data_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-nested-classes" class="groupheader"><a id="nested-classes" name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:BlockHeader" id="r_BlockHeader"><td class="memItemLeft">struct &#160;</td><td class="memItemRight"><a class="el" href="structBlockHeader.html">BlockHeader</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Header preceding the compressed data payload of a data block (BlockType::DataBlock).  <a href="structBlockHeader.html#details">More...</a><br /></td></tr>
<tr class="memitem:GeometryBlockHeader" id="r_GeometryBlockHeader"><td class="memItemLeft">struct &#160;</td><td class="memItemRight"><a class="el" href="structGeometryBlockHeader.html">GeometryBlockHeader</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Legacy CHS style logical geometry metadata (BlockType::GeometryBlock).  <a href="structGeometryBlockHeader.html#details">More...</a><br /></td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:a1ca609714b5efe0b8571c14c51fd4609" id="r_a1ca609714b5efe0b8571c14c51fd4609"><td class="memItemLeft">typedef struct BlockHeader&#160;</td><td class="memItemRight"><a class="el" href="#a1ca609714b5efe0b8571c14c51fd4609">BlockHeader</a></td></tr>
<tr class="memitem:ac4dce55b0edbc0bfdef3fcc84c63a78d" id="r_ac4dce55b0edbc0bfdef3fcc84c63a78d"><td class="memItemLeft">typedef struct GeometryBlockHeader&#160;</td><td class="memItemRight"><a class="el" href="#ac4dce55b0edbc0bfdef3fcc84c63a78d">GeometryBlockHeader</a></td></tr>
</table>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>On-disk layout structures for data-bearing and geometry blocks. </p>
<p>These packed structures describe the headers that precede variable-length payloads inside blocks whose identifiers are enumerated in <a class="el" href="enums_8h.html#a54420623f26ab6bb61042b41cccf37a3" title="BlockType">BlockType</a>. All integer fields are stored little-endian on disk. The library currently assumes a little-endian host; if ported to a big-endian architecture explicit byte swapping will be required.</p>
<p>Layout of a data block (BlockType::DataBlock): <a class="el" href="structBlockHeader.html" title="Header preceding the compressed data payload of a data block (BlockType::DataBlock).">BlockHeader</a> (sizeof(BlockHeader) bytes) Compressed payload (cmpLength bytes)</p>
<p>Payload decoding:</p><ul>
<li>Apply the algorithm indicated by <a class="el" href="structBlockHeader.html#ad68963422fd2a5f6d0e0be751cbef559" title="BlockHeader::compression">BlockHeader::compression</a> (<a class="el" href="enums_8h.html#affec749ed88365143745313ae9168263" title="CompressionType">CompressionType</a>) to the cmpLength bytes following the header to obtain exactly <a class="el" href="structBlockHeader.html#a1f9f3204a10090709b28d0df4bb547e5" title="BlockHeader::length">BlockHeader::length</a> bytes.</li>
<li>The uncompressed data MUST be an integer multiple of <a class="el" href="structBlockHeader.html#a5bd50f95c8c1f91e5013a1a154690beb" title="BlockHeader::sectorSize">BlockHeader::sectorSize</a>.</li>
<li>A CRC64-ECMA is provided for both compressed (cmpCrc64) and uncompressed (crc64) forms to allow validation at either stage of the pipeline.</li>
</ul>
<p>Geometry block (BlockType::GeometryBlock) has a <a class="el" href="structGeometryBlockHeader.html" title="GeometryBlockHeader">GeometryBlockHeader</a> followed by no additional fixed payload in the current format version; it conveys legacy CHS-style logical geometry metadata.</p>
<dl class="section warning"><dt>Warning</dt><dd>These structs are packed; do not take their address and assume natural alignment. </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="enums_8h.html#a54420623f26ab6bb61042b41cccf37a3" title="List of known block types contained in an Aaru image.">BlockType</a> </dd>
<dd>
<a class="el" href="enums_8h.html#ad8ed01ff3ff33333d8e19db4d2818bb6" title="List of known data types stored within an Aaru image.">DataType</a> </dd>
<dd>
<a class="el" href="enums_8h.html#affec749ed88365143745313ae9168263" title="List of known compression types.">CompressionType</a> </dd></dl>

<p class="definition">Definition in file <a class="el" href="data_8h_source.html">data.h</a>.</p>
</div><a name="doc-typedef-members" id="doc-typedef-members"></a><h2 id="header-doc-typedef-members" class="groupheader">Typedef Documentation</h2>
<a id="a1ca609714b5efe0b8571c14c51fd4609" name="a1ca609714b5efe0b8571c14c51fd4609"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1ca609714b5efe0b8571c14c51fd4609">&#9670;&#160;</a></span>BlockHeader</h2>

<div class="memitem">
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          <td class="memname">typedef struct BlockHeader BlockHeader</td>
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<a id="ac4dce55b0edbc0bfdef3fcc84c63a78d" name="ac4dce55b0edbc0bfdef3fcc84c63a78d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac4dce55b0edbc0bfdef3fcc84c63a78d">&#9670;&#160;</a></span>GeometryBlockHeader</h2>

<div class="memitem">
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          <td class="memname">typedef struct GeometryBlockHeader GeometryBlockHeader</td>
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