merges r30772,r30773 and r30776 from trunk into ruby_1_9_2.

--
* ext/zlib/zlib.c (gzfile_reader_get_unused): use rb_str_new_shared
  because gz->z.input is hidden string. [ruby-core:35057]
--
e ext/zlib/zlib.c (gzfile_reader_get_unused): use rb_str_resurrect
--
* ext/zlib/zlib.c (gzfile_reader_get_unused): no need to dup
  before rb_str_resurrect.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31204 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 36 insertions, 8 deletions

diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index 6b13cf6026..5432ce2c1a 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -86,7 +86,7 @@ if defined? Zlib
     def test_adler
       z = Zlib::Deflate.new
       z << "foo"
-      s = z.finish
+      z.finish
       assert_equal(0x02820145, z.adler)
     end
 
@@ -95,7 +95,7 @@ if defined? Zlib
       assert_equal(false, z.finished?)
       z << "foo"
       assert_equal(false, z.finished?)
-      s = z.finish
+      z.finish
       assert_equal(true, z.finished?)
       z.close
       assert_raise(Zlib::Error) { z.finished? }
@@ -459,12 +459,40 @@ if defined? Zlib
       t.close
       Zlib::GzipWriter.open(t.path) {|gz| gz.print("foobar") }
 
-      f = Zlib::GzipReader.open(t.path)
-      assert_equal("foo", f.read(3))
-      f.unused
-      assert_equal("bar", f.read)
-      f.unused
-      f.close
+      Zlib::GzipReader.open(t.path) do |f|
+        assert_equal(nil, f.unused)
+        assert_equal("foo", f.read(3))
+        assert_equal(nil, f.unused)
+        assert_equal("bar", f.read)
+        assert_equal(nil, f.unused)
+      end
+    end
+
+    def test_unused2
+      zio = StringIO.new
+
+      io = Zlib::GzipWriter.new zio
+      io.write 'aaaa'
+      io.finish
+
+      io = Zlib::GzipWriter.new zio
+      io.write 'bbbb'
+      io.finish
+
+      zio.rewind
+
+      io = Zlib::GzipReader.new zio
+      assert_equal('aaaa', io.read)
+      unused = io.unused
+      assert_equal(24, unused.bytesize)
+      io.finish
+
+      zio.pos -= unused.length
+
+      io = Zlib::GzipReader.new zio
+      assert_equal('bbbb', io.read)
+      assert_equal(nil, io.unused)
+      io.finish
     end
 
     def test_read