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PORuby and Null-Terminated Strings
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  1. PORuby and Null-Terminated Strings
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    copied!<p>I'm working with the Source Engine protocol currently, writing/porting a library over to use with a future Rails project.</p> <p>My question is...in this reference material, it talks about strings being null-terminated (which, I always thought was '\0').</p> <p>When I go to test this library I wrote (relevant segment attached), it's not working, because in IRB, it's converting my null termination to \u0000 (unicode). How do I fix this to work with the data that's going to be coming in UDP packets? I assume the problem is encoding-related.</p> <pre><code># Get a null ('/0') terminated string from the buffer. def get_string zero_byte = @buffer.index('\0',@position) if zero_byte === nil string = '' else string = get(zero_byte-@position) @position+=1 end string end </code></pre> <p>Basically, it's supposed to find a "null" character, and then take that chunk of data and return it as a string, then move the 'position' in the buffer to the null character so it can be read further.</p> <p>When I run this in ERB, the following happens:</p> <pre><code>2.0.0-p247 :001 &gt; load 'source_buffer.rb' =&gt; true 2.0.0-p247 :002 &gt; b = SourceBuffer.new =&gt; #&lt;SourceBuffer:0x000000023d56d8&gt; 2.0.0-p247 :003 &gt; b.set("Source Engine Query\0") =&gt; 0 2.0.0-p247 :004 &gt; b.get_string =&gt; "" 2.0.0-p247 :005 &gt; b.buffer =&gt; "Source Engine Query\u0000" </code></pre> <p>As you can see, the '\0' I've put in the buffer is being converted to Unicode, and that's breaking my IRB testing.</p> <p>This is going to be used with the following protocol when all is said and done, not sure if that's immediately relevant at this time: </p> <p><a href="https://developer.valvesoftware.com/wiki/Server_queries" rel="nofollow">https://developer.valvesoftware.com/wiki/Server_queries</a></p> <p>Anyway, any help would be greatly appreciated. Thanks a lot, to all who read this.</p>
 

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