Bug #4360: Zlib::GzipReader#unused raises "called on hidden object" error when called

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 1.9.3dev (2011-02-01 trunk 30751) [x86_64-darwin10.6.0]

[drbrain (Eric Hodel)]

=begin
When reading concatenated gzip streams #unused is provided for accessing the data that has been read from the IO but not consumed by libz. Unfortunately calling this method raises an exception:

$ ruby19 -v t.rb
ruby 1.9.3dev (2011-02-01 trunk 30751) [x86_64-darwin10.6.0]
aaaa
t.rb:21:in <main>': method method_missing' called on hidden T_STRING object (0x0000010090ee20 flags=0x6105 klass=0x0) (NotImplementedError)

Zlib::GzipReader#unused returns the internal buffer directly but dups it. Copying the input string's contents duplicates fixes the problem. A stupid patch is attached.

This occurs on 1.8.7, 1.9.1 and 1.9.2 as well.
=end

[drbrain (Eric Hodel)]

=begin
See also [ruby-talk:377703]
=end

[naruse (Yui NARUSE)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

=begin
This issue was solved with changeset r30772.
Eric, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• ext/zlib/zlib.c (gzfile_reader_get_unused): use rb_str_new_shared
  because gz->z.input is hidden string. [ruby-core:35057]
  =end