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<title>src/Codec/Binary/Base16.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module : Codec.Binary.Base16</span>
<a name="line-3"></a><span class='hs-comment'>-- Copyright : (c) 2007 Magnus Therning</span>
<a name="line-4"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- Implemented as specified in RFC 4648 (<<a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/html/rfc4648</a>>).</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Further documentation and information can be found at</span>
<a name="line-9"></a><span class='hs-comment'>-- <<a href="http://www.haskell.org/haskellwiki/Library/Data_encoding">http://www.haskell.org/haskellwiki/Library/Data_encoding</a>>.</span>
<a name="line-10"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Codec</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>Base16</span>
<a name="line-11"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>EncIncData</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>EncIncRes</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encodeInc</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encode</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DecIncData</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DecIncRes</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decodeInc</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decode</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>chop</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unchop</span>
<a name="line-21"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Codec</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span>
<a name="line-30"></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'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-comment'>-- {{{1 enc/dec map</span>
<a name="line-33"></a><span class='hs-sel'>_encMap</span> <span class='hs-keyglyph'>=</span>
<a name="line-34"></a> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-chr'>'0'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-chr'>'1'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span><span class='hs-layout'>,</span> <span class='hs-chr'>'2'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>3</span><span class='hs-layout'>,</span> <span class='hs-chr'>'3'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>4</span><span class='hs-layout'>,</span> <span class='hs-chr'>'4'</span><span class='hs-layout'>)</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>5</span><span class='hs-layout'>,</span> <span class='hs-chr'>'5'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>6</span><span class='hs-layout'>,</span> <span class='hs-chr'>'6'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>7</span><span class='hs-layout'>,</span> <span class='hs-chr'>'7'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>8</span><span class='hs-layout'>,</span> <span class='hs-chr'>'8'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>9</span><span class='hs-layout'>,</span> <span class='hs-chr'>'9'</span><span class='hs-layout'>)</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>10</span><span class='hs-layout'>,</span> <span class='hs-chr'>'A'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>11</span><span class='hs-layout'>,</span> <span class='hs-chr'>'B'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>12</span><span class='hs-layout'>,</span> <span class='hs-chr'>'C'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>13</span><span class='hs-layout'>,</span> <span class='hs-chr'>'D'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>14</span><span class='hs-layout'>,</span> <span class='hs-chr'>'E'</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>15</span><span class='hs-layout'>,</span> <span class='hs-chr'>'F'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="encodeArray"></a><span class='hs-comment'>-- {{{1 encodeArray</span>
<a name="line-40"></a><span class='hs-definition'>encodeArray</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Array</span> <span class='hs-conid'>Word8</span> <span class='hs-conid'>Char</span>
<a name="line-41"></a><span class='hs-definition'>encodeArray</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>array</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-num'>64</span><span class='hs-layout'>)</span> <span class='hs-sel'>_encMap</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="decodeMap"></a><span class='hs-comment'>-- {{{1 decodeMap</span>
<a name="line-44"></a><span class='hs-definition'>decodeMap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Char</span> <span class='hs-conid'>Word8</span>
<a name="line-45"></a><span class='hs-definition'>decodeMap</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>snd</span> <span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-sel'>_encMap</span><span class='hs-keyglyph'>]</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="encodeInc"></a><span class='hs-comment'>-- {{{1 encode</span>
<a name="line-48"></a><span class='hs-comment'>-- | Incremental encoder function.</span>
<a name="line-49"></a><span class='hs-definition'>encodeInc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EncIncData</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EncIncRes</span> <span class='hs-conid'>String</span>
<a name="line-50"></a><span class='hs-definition'>encodeInc</span> <span class='hs-conid'>EDone</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EFinal</span> <span class='hs-conid'>[]</span>
<a name="line-51"></a><span class='hs-definition'>encodeInc</span> <span class='hs-layout'>(</span><span class='hs-conid'>EChunk</span> <span class='hs-varid'>os</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EPart</span> <span class='hs-layout'>(</span><span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>toHex</span> <span class='hs-varid'>os</span><span class='hs-layout'>)</span> <span class='hs-varid'>encodeInc</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="encode"></a><span class='hs-comment'>-- | Encode data.</span>
<a name="line-54"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-55"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>encoder</span> <span class='hs-varid'>encodeInc</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="decodeInc"></a><span class='hs-comment'>-- {{{1 decode</span>
<a name="line-58"></a><span class='hs-comment'>-- | Incremental decoder function.</span>
<a name="line-59"></a><span class='hs-definition'>decodeInc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecIncData</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecIncRes</span> <span class='hs-conid'>String</span>
<a name="line-60"></a><span class='hs-definition'>decodeInc</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dI</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>d</span>
<a name="line-61"></a> <span class='hs-keyword'>where</span>
<a name="line-62"></a> <span class='hs-varid'>dec2</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-63"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>decodeMap</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span>
<a name="line-64"></a> <span class='hs-varid'>es</span><span class='hs-keyglyph'>@</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>e1</span><span class='hs-layout'>,</span> <span class='hs-varid'>e2</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fromJust</span> <span class='hs-varid'>ds</span>
<a name="line-65"></a> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e1</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>4</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>e2</span>
<a name="line-66"></a> <span class='hs-varid'>allJust</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>and</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>isJust</span>
<a name="line-67"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>allJust</span> <span class='hs-varid'>ds</span>
<a name="line-68"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>o</span>
<a name="line-69"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Nothing</span>
<a name="line-70"></a>
<a name="line-71"></a> <span class='hs-varid'>dI</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>DDone</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DFinal</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span>
<a name="line-72"></a> <span class='hs-varid'>dI</span> <span class='hs-varid'>lo</span> <span class='hs-conid'>DDone</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DFail</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>lo</span>
<a name="line-73"></a> <span class='hs-varid'>dI</span> <span class='hs-varid'>lo</span> <span class='hs-layout'>(</span><span class='hs-conid'>DChunk</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>doDec</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>lo</span> <span class='hs-varop'>++</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span>
<a name="line-75"></a> <span class='hs-varid'>doDec</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s'</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>c1</span><span class='hs-conop'>:</span><span class='hs-varid'>c2</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span>
<a name="line-76"></a> <span class='hs-layout'>(</span><span class='hs-conid'>DFail</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>doDec</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-layout'>(</span><span class='hs-varid'>dec2</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c1</span><span class='hs-layout'>,</span> <span class='hs-varid'>c2</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-79"></a> <span class='hs-varid'>doDec</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DPart</span> <span class='hs-varid'>acc</span> <span class='hs-layout'>(</span><span class='hs-varid'>dI</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="decode"></a><span class='hs-comment'>-- | Decode data.</span>
<a name="line-82"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span>
<a name="line-83"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decoder</span> <span class='hs-varid'>decodeInc</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="chop"></a><span class='hs-comment'>-- {{{1 chop</span>
<a name="line-86"></a><span class='hs-comment'>-- | Chop up a string in parts.</span>
<a name="line-87"></a><span class='hs-comment'>--</span>
<a name="line-88"></a><span class='hs-comment'>-- The length given is rounded down to the nearest multiple of 2.</span>
<a name="line-89"></a><span class='hs-definition'>chop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ length of individual lines</span>
<a name="line-90"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-91"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-92"></a><span class='hs-definition'>chop</span> <span class='hs-varid'>n</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-93"></a><span class='hs-definition'>chop</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-94"></a> <span class='hs-varid'>enc_len</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>2</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-num'>2</span>
<a name="line-96"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>take</span> <span class='hs-varid'>enc_len</span> <span class='hs-varid'>s</span> <span class='hs-conop'>:</span> <span class='hs-varid'>chop</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>drop</span> <span class='hs-varid'>enc_len</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-97"></a>
<a name="line-98"></a><a name="unchop"></a><span class='hs-comment'>-- {{{1 unchop</span>
<a name="line-99"></a><span class='hs-comment'>-- | Concatenate the strings into one long string.</span>
<a name="line-100"></a><span class='hs-definition'>unchop</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-101"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-102"></a><span class='hs-definition'>unchop</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span>
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