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copied!<p><strong>edit</strong> Checkers has reduced my C solution to <a href="https://stackoverflow.com/questions/795027/code-golf-hex-to-raw-binary-conversion/795944#795944">46 bytes</a>, which was then reduced to 44 bytes thanks to a tip from BillyONeal plus a bugfix on my part (no more infinite loop on bad input, now it just terminates the loop). Please give credit to Checkers for reducing this from 77 to 46 bytes:</p> <pre><code>main(i){while(scanf("%2x",&i)>0)putchar(i);} </code></pre> <p>And I have a much better Ruby solution than my last, in <del>42</del> <em>38</em> bytes (thanks to Joshua Swank for the regexp suggestion):</p> <pre><code>STDIN.read.scan(/\S\S/){|x|putc x.hex} </code></pre> <p><strong>original solutions</strong></p> <p>C, in 77 bytes, or two lines of code (would be 1 if you could put the <code>#include</code> on the same line). Note that this has an infinite loop on bad input; the 44 byte solution with the help of Checkers and BillyONeal fixes the bug, and simply stops on bad input.</p> <pre><code>#include <stdio.h> int main(){char c;while(scanf("%2x",&c)!=EOF)putchar(c);} </code></pre> <p>It's even just 6 lines if you format it normally:</p> <pre><code>#include <stdio.h> int main() { char c; while (scanf("%2x",&c) != EOF) putchar(c); } </code></pre> <p>Ruby, 79 bytes (I'm sure this can be improved): </p> <pre><code>STDOUT.write STDIN.read.scan(/[^\s]\s*[^\s]\s*/).map{|x|x.to_i(16)}.pack("c*") </code></pre> <p>These both take input from STDIN and write to STDOUT</p>

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