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<h1 class="title">std/endians</h1>
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<summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
<ul class="simple simple-toc-section">
<ul class="simple nested-toc-section">bigEndian16
<li><a class="reference" href="#bigEndian16%2Cpointer%2Cpointer" title="bigEndian16(outp, inp: pointer)">bigEndian16(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">bigEndian32
<li><a class="reference" href="#bigEndian32%2Cpointer%2Cpointer" title="bigEndian32(outp, inp: pointer)">bigEndian32(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">bigEndian64
<li><a class="reference" href="#bigEndian64%2Cpointer%2Cpointer" title="bigEndian64(outp, inp: pointer)">bigEndian64(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">littleEndian16
<li><a class="reference" href="#littleEndian16%2Cpointer%2Cpointer" title="littleEndian16(outp, inp: pointer)">littleEndian16(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">littleEndian32
<li><a class="reference" href="#littleEndian32%2Cpointer%2Cpointer" title="littleEndian32(outp, inp: pointer)">littleEndian32(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">littleEndian64
<li><a class="reference" href="#littleEndian64%2Cpointer%2Cpointer" title="littleEndian64(outp, inp: pointer)">littleEndian64(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">swapEndian16
<li><a class="reference" href="#swapEndian16%2Cpointer%2Cpointer" title="swapEndian16(outp, inp: pointer)">swapEndian16(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">swapEndian32
<li><a class="reference" href="#swapEndian32%2Cpointer%2Cpointer" title="swapEndian32(outp, inp: pointer)">swapEndian32(outp, inp: pointer)</a></li>
</ul>
<ul class="simple nested-toc-section">swapEndian64
<li><a class="reference" href="#swapEndian64%2Cpointer%2Cpointer" title="swapEndian64(outp, inp: pointer)">swapEndian64(outp, inp: pointer)</a></li>
</ul>
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<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
<div id="tocRoot"></div>
<p class="module-desc"><p>This module contains helpers that deal with different byte orders (<span id="endian_1">endian</span>).</p>
<p>Endianness is the order of bytes of a value in memory. Big-endian means that the most significant byte is stored at the smallest memory address, while little endian means that the least-significant byte is stored at the smallest address. See also <a class="reference external" href="https://en.wikipedia.org/wiki/Endianness">https://en.wikipedia.org/wiki/Endianness</a>.</p>
<p>Unstable API.</p>
</p>
<div class="section" id="12">
<h1><a class="toc-backref" href="#12">Procs</a></h1>
<dl class="item">
<div id="bigEndian16-procs-all">
<div id="bigEndian16,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#bigEndian16%2Cpointer%2Cpointer"><span class="Identifier">bigEndian16</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 16-bit big-endian order. Both buffers are supposed to contain at least 2 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L146" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L146" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="bigEndian32-procs-all">
<div id="bigEndian32,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#bigEndian32%2Cpointer%2Cpointer"><span class="Identifier">bigEndian32</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 32-bit big-endian order. Both buffers are supposed to contain at least 4 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L143" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L143" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="bigEndian64-procs-all">
<div id="bigEndian64,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#bigEndian64%2Cpointer%2Cpointer"><span class="Identifier">bigEndian64</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 64-bit big-endian order. Both buffers are supposed to contain at least 8 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L140" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L140" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="littleEndian16-procs-all">
<div id="littleEndian16,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#littleEndian16%2Cpointer%2Cpointer"><span class="Identifier">littleEndian16</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 16-bit little-endian order. Both buffers are supposed to contain at least 2 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L137" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L137" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="littleEndian32-procs-all">
<div id="littleEndian32,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#littleEndian32%2Cpointer%2Cpointer"><span class="Identifier">littleEndian32</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 32-bit little-endian order. Both buffers are supposed to contain at least 4 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L134" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L134" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="littleEndian64-procs-all">
<div id="littleEndian64,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#littleEndian64%2Cpointer%2Cpointer"><span class="Identifier">littleEndian64</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, storing it in 64-bit little-endian order. Both buffers are supposed to contain at least 8 bytes.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L131" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L131" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="swapEndian16-procs-all">
<div id="swapEndian16,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#swapEndian16%2Cpointer%2Cpointer"><span class="Identifier">swapEndian16</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span class="Identifier">noSideEffect</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, reversing the byte order. Both buffers are supposed to contain at least 2 bytes.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">1'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">]</span>
<span class="Keyword">var</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Identifier">array</span><span class="Punctuation">[</span><span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="Identifier">uint8</span><span class="Punctuation">]</span>
<span class="Identifier">swapEndian16</span><span class="Punctuation">(</span><span class="Keyword">addr</span> <span class="Identifier">b</span><span class="Punctuation">,</span> <span class="Keyword">addr</span> <span class="Identifier">a</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">b</span> <span class="Operator">==</span> <span class="Punctuation">[</span><span class="DecNumber">2'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">1</span><span class="Punctuation">]</span></pre>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L85" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L85" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="swapEndian32-procs-all">
<div id="swapEndian32,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#swapEndian32%2Cpointer%2Cpointer"><span class="Identifier">swapEndian32</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span class="Identifier">noSideEffect</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, reversing the byte order. Both buffers are supposed to contain at least 4 bytes.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">1'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">]</span>
<span class="Keyword">var</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Identifier">array</span><span class="Punctuation">[</span><span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="Identifier">uint8</span><span class="Punctuation">]</span>
<span class="Identifier">swapEndian32</span><span class="Punctuation">(</span><span class="Keyword">addr</span> <span class="Identifier">b</span><span class="Punctuation">,</span> <span class="Keyword">addr</span> <span class="Identifier">a</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">b</span> <span class="Operator">==</span> <span class="Punctuation">[</span><span class="DecNumber">4'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">1</span><span class="Punctuation">]</span></pre>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L74" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L74" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="swapEndian64-procs-all">
<div id="swapEndian64,pointer,pointer">
<dt><pre><span class="Keyword">proc</span> <a href="#swapEndian64%2Cpointer%2Cpointer"><span class="Identifier">swapEndian64</span></a><span class="Other">(</span><span class="Identifier">outp</span><span class="Other">,</span> <span class="Identifier">inp</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span class="Identifier">noSideEffect</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Copies <tt class="docutils literal"><span class="pre"><span class="Identifier">inp</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">outp</span></span></tt>, reversing the byte order. Both buffers are supposed to contain at least 8 bytes.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">1'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">6</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">8</span><span class="Punctuation">]</span>
<span class="Keyword">var</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Identifier">array</span><span class="Punctuation">[</span><span class="DecNumber">8</span><span class="Punctuation">,</span> <span class="Identifier">uint8</span><span class="Punctuation">]</span>
<span class="Identifier">swapEndian64</span><span class="Punctuation">(</span><span class="Keyword">addr</span> <span class="Identifier">b</span><span class="Punctuation">,</span> <span class="Keyword">addr</span> <span class="Identifier">a</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">b</span> <span class="Operator">==</span> <span class="Punctuation">[</span><span class="DecNumber">8'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">6</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">1</span><span class="Punctuation">]</span></pre>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/endians.nim#L63" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/endians.nim#L63" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
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