The default decompress method works for me...

$ irb -r zlib
irb(main):001:0> File.stat('threehundred.gz').size / (1024**2)
=> 81
irb(main):002:0> Zlib::GzipReader.open('threehundred.gz') { |r|
File.open('threehundred', 'wb') { |f| f.write r.read } }
=> 314835846
irb(main):003:0> File.stat('threehundred').size / (1024**2)
=> 300

What version of ruby are you using?

On Mar 14, 2:42 am, "greg" <eeg... / gmail.com> wrote:
> I am trying to decompress a 80MB file (decompresses to 300MB), but I
> keep getting a buffer error.  I thought I had a workaround using
> chunks, but it fails with 20M left to go.  Any help or suggestions are
> greatly appreciated.
>
> in `read': buffer error (Zlib::BufError)
>
> class Zlib::GzipReader
>   def each_chunk(chunk_size=1024)
>     yield read(chunk_size) until eof
>   end
> end
>
> gz = Zlib::GzipReader.open(zip_file)
>
> File.open( non_zip_file, 'wb' ) do |f|
>   gz.each_chunk {|chunk| f.write(chunk)}
> end