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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Base64</span>
<a name="line-4"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>encode</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decode</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encodeURL</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decodeURL</span>
<a name="line-8"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>unless</span><span class='hs-layout'>)</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Base64</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B64</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Base64</span><span class='hs-varop'>.</span><span class='hs-conid'>URL</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B64U</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span>
<a name="line-19"></a>
<a name="line-20"></a><a name="encode"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Conduit</span> <span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ByteString</span>
<a name="line-21"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codeWith</span> <span class='hs-num'>3</span> <span class='hs-conid'>B64</span><span class='hs-varop'>.</span><span class='hs-varid'>encode</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="decode"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Conduit</span> <span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ByteString</span>
<a name="line-24"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codeWith</span> <span class='hs-num'>4</span> <span class='hs-conid'>B64</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeLenient</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="encodeURL"></a><span class='hs-definition'>encodeURL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Conduit</span> <span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ByteString</span>
<a name="line-27"></a><span class='hs-definition'>encodeURL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codeWith</span> <span class='hs-num'>3</span> <span class='hs-conid'>B64U</span><span class='hs-varop'>.</span><span class='hs-varid'>encode</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="decodeURL"></a><span class='hs-definition'>decodeURL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Conduit</span> <span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ByteString</span>
<a name="line-30"></a><span class='hs-definition'>decodeURL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codeWith</span> <span class='hs-num'>4</span> <span class='hs-conid'>B64U</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeLenient</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="codeWith"></a><span class='hs-definition'>codeWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ByteString</span>
<a name="line-33"></a><span class='hs-definition'>codeWith</span> <span class='hs-varid'>size</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-34"></a> <span class='hs-varid'>loop</span>
<a name="line-35"></a> <span class='hs-keyword'>where</span>
<a name="line-36"></a> <span class='hs-varid'>loop</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>await</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>push</span>
<a name="line-37"></a>
<a name="line-38"></a> <span class='hs-varid'>loopWith</span> <span class='hs-varid'>bs</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>await</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>yield</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>pushWith</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-43"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>size</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>bs</span>
<a name="line-44"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>yield</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-45"></a> <span class='hs-varid'>loopWith</span> <span class='hs-varid'>y</span>
<a name="line-46"></a> <span class='hs-keyword'>where</span>
<a name="line-47"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-varid'>pushWith</span> <span class='hs-varid'>bs1</span> <span class='hs-varid'>bs2</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs1</span> <span class='hs-varop'>+</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs2</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loopWith</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>append</span> <span class='hs-varid'>bs1</span> <span class='hs-varid'>bs2</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-varid'>pushWith</span> <span class='hs-varid'>bs1</span> <span class='hs-varid'>bs2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>assertion1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>assertion2</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-51"></a> <span class='hs-varid'>yield</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs1'</span>
<a name="line-52"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>y</span>
<a name="line-53"></a> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs1</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>size</span>
<a name="line-55"></a> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>size</span> <span class='hs-comment'>-</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>bs2</span>
<a name="line-56"></a> <span class='hs-varid'>bs1'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>append</span> <span class='hs-varid'>bs1</span> <span class='hs-varid'>x</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-varid'>assertion1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>assert</span> <span class='hs-varop'>$</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs1</span> <span class='hs-varop'><</span> <span class='hs-varid'>size</span>
<a name="line-59"></a> <span class='hs-varid'>assertion2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>assert</span> <span class='hs-varop'>$</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bs1'</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>size</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
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