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copied!<p>The accepted answer didn't work for me. Here's my modified version. Notice the different usage of <code>gz.unused</code>.</p> <p>Also, you should call <code>finish</code> on the <code>GzipReader</code> instance to avoid memory leaks.</p> <pre><code># gzcat-test.rb require 'zlib' require 'stringio' require 'digest/sha1' # gzip -c /usr/share/dict/web2 /usr/share/dict/web2a > web-cat.gz io = File.open('web-cat.gz') # or, if you don't care about memory usage: # io = StringIO.new File.read 'web-cat.gz' # these will be hashes: {orig_name: 'filename', data_arr: unpacked_lines} entries=[] loop do entries << {data_arr: []} # create a reader starting at io's current position gz = Zlib::GzipReader.new(io) entries.last[:orig_name] = gz.orig_name gz.each {|l| entries.last[:data_arr] << l } unused = gz.unused # save this before calling #finish gz.finish if unused # Unused is not the entire remainder, but only part of it. # We need to back up since we've moved past the start of the next entry. io.pos -= unused.size else break end end io.close # verify the data entries.each do |entry_hash| p entry_hash[:orig_name] puts Digest::SHA1.hexdigest(entry_hash[:data_arr].join) end </code></pre> <p>Run:</p> <pre><code>> ./gzcat-test.rb web2" a62edf8685920f7d5a95113020631cdebd18a185 "web2a" b0870457df2b8cae06a88657a198d9b52f8e2b0a </code></pre> <p>Our unpacked contents match the originals:</p> <pre><code>> shasum /usr/share/dict/web* a62edf8685920f7d5a95113020631cdebd18a185 /usr/share/dict/web2 b0870457df2b8cae06a88657a198d9b52f8e2b0a /usr/share/dict/web2a </code></pre>

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