From: Nobuyoshi Nakada <nobu@...>
Date: 2007-12-01T11:39:37+09:00
Subject: Re: Running GzipWriter on same input produces different output

Hi,

At Sat, 1 Dec 2007 08:46:09 +0900,
Raymond O'Connor wrote in [ruby-talk:281540]:
> Is it normal that everytime I gzip the same contents, the output is
> different?

Yes.

$ ruby /usr/bin/irb -rstringio -rzlib --prompt xmp
strio = StringIO.new("")
    ==>#<StringIO:0x7ff087e4>
gz = Zlib::GzipWriter.new(strio)
    ==>#<Zlib::GzipWriter:0x7fef390c>
t = Time.now; gz.write("foobar")
    ==>6
gz.close
    ==>#<StringIO:0x7ff087e4>
[t.to_i, strio.string.unpack("x4V")[0]]
    ==>[1196476556, 1196476556]
_[0] == _[1]
    ==>true

-- 
Nobu Nakada