Bug #11180: Missing lines with Zlib::GzipReader

• Status: Closed
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: 2.2.2
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
• Tags: ext

[exAspArk (Evgeny Li)]

Hi,

I have a script which is written in Python. It simply appends lines to archive file:

#!/usr/bin/env python

import gzip

gstoragefile = 'test.json.gz'

gf = gzip.open(gstoragefile, 'ab')
print >> gf, "foo"
gf.close

gf = gzip.open(gstoragefile, 'ab')
print >> gf, "bar"
gf.close

Later I can read this lines:

gunzip -c test.json.gz
> foo
> bar

However, reading this archive with Ruby doesn't work. Looks like Ruby can read only lines from first written batch (foo):

require "zlib"

Zlib::GzipReader.new(File.open("test.json.gz")).readlines.size
# => 1

[exAspArk (Evgeny Li)]

Looks like the issue might be similar to https://bugs.ruby-lang.org/issues/9790.

[nagachika (Tomoyuki Chikanaga)]

• Is duplicate of Bug #9790: Zlib::GzipReader only decompressed the first of concatenated files added

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed

matz approved Zlib::GzipReader.zcat, so I merged the pull request into zlib.