From b6d5ce7975667cc32d7d86a992d5206627e5ff73 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 8 Mar 2015 13:52:51 +0000
Subject: [PATCH] * ext/zlib/zlib.c (rb_gzfile_close): Don't raise on double  
 close for consistent to IO#close.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49893 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog              |  5 +++++
 ext/zlib/zlib.c        |  6 +++++-
 test/zlib/test_zlib.rb | 22 ++++++++++++++++++++++
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 5e7790783a..d45f02545c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Mar  8 22:50:57 2015  Tanaka Akira  <akr@fsij.org>
+
+	* ext/zlib/zlib.c (rb_gzfile_close): Don't raise on double
+	  close for consistent to IO#close.
+
 Sun Mar  8 16:57:35 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (glob_helper): match patterns against legacy short names
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index 8f24b77d8f..9c2b7b624f 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -3297,9 +3297,13 @@ rb_gzfile_set_comment(VALUE obj, VALUE str)
 static VALUE
 rb_gzfile_close(VALUE obj)
 {
-    struct gzfile *gz = get_gzfile(obj);
+    struct gzfile *gz;
     VALUE io;
 
+    TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz);
+    if (!ZSTREAM_IS_READY(&gz->z)) {
+        return Qnil;
+    }
     io = gz->io;
     gzfile_close(gz, 1);
     return io;
diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index 3a2fe9274d..63bbd27cc6 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -962,6 +962,19 @@ if defined? Zlib
         assert_equal(content, read_size)
       }
     end
+
+    def test_double_close
+      Tempfile.create("test_zlib_gzip_reader_close") {|t|
+        t.binmode
+        content = "foo"
+        Zlib::GzipWriter.wrap(t) {|gz| gz.print(content) }
+        r = Zlib::GzipReader.open(t.path)
+        assert_equal(content, r.read)
+        assert_nothing_raised { r.close }
+        assert_nothing_raised { r.close }
+      }
+    end
+
   end
 
   class TestZlibGzipWriter < Test::Unit::TestCase
@@ -1022,6 +1035,15 @@ if defined? Zlib
         assert_equal("foo", Zlib::GzipReader.open(t.path) {|gz| gz.read })
       }
     end
+
+    def test_double_close
+      Tempfile.create("test_zlib_gzip_reader_close") {|t|
+        t.binmode
+        w = Zlib::GzipWriter.wrap(t)
+        assert_nothing_raised { w.close }
+        assert_nothing_raised { w.close }
+      }
+    end
   end
 
   class TestZlib < Test::Unit::TestCase