Zlib::GzipReader doesn't work as expected

Hi,
given 2 files:
cat 5lines.txt
5 lines
5 lines
5 lines
5 lines
5 lines

cat more5lines.txt
More 5 lines
More 5 lines
More 5 lines
More 5 lines
More 5 lines

These files are "gzip"ed as follows:
gzip < 5lines.txt > foo.gz
gzip < more5lines.txt >> foo.gz

zcat foo.gz:
5 lines
5 lines
5 lines
5 lines
5 lines
More 5 lines
More 5 lines
More 5 lines
More 5 lines
More 5 lines

This ruby code only reads the first 5 lines:
#!/usr/bin/ruby
require "zlib"
filename = ARGV[0]

Zlib::GzipReader.open(filename) {|gz|
print gz.read
}

../test.rb foo.gz
5 lines
5 lines
5 lines
5 lines
5 lines

How do I force Zlib::GzipReader do read the whole file?

ruby versions: 1.8.7 and 1.9.0

Thanks and regards,
Thomas Wolf
.

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