From: Brian Candler <b.candler@...>
Date: 2010-08-18T18:40:25+09:00
Subject: Re: Making File.open work on gzipped files

Robert Klemme wrote:
> On 17.08.2010 20:56, Martin Hansen wrote:
>> Thanks Brian,
>>
>> I did look at ruby's zlib and wondered why there is no method to check
>> if a file is zipped or not - one could perhaps could fix something by
>> rescuing the Zlib exception?
> 
> Exactly, just try to open with GzipReader and if that throws just work
> with the regular file which you have opened already.

Remember to rewind it too.

>> require 'zlib'
=> true
>> io = File.open("/etc/passwd")
=> #<File:/etc/passwd>
>> z = Zlib::GzipReader.new(io)
Zlib::GzipFile::Error: not in gzip format
  from (irb):3:in `initialize'
  from (irb):3:in `new'
  from (irb):3
  from :0
>> io.gets
=> "1:119:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n"
>> io.rewind
=> 0
>> io.gets
=> "root:x:0:0:root:/root:/bin/bash\n"
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