nobu	2014-04-18 20:46:02 +0900 (Fri, 18 Apr 2014)

  New Revision: 45625

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=45625

  Log:
    zlib.c: return unshared string
    
    * ext/zlib/zlib.c (zstream_shift_buffer): create new copied string
      since it cannot be shared ever.

  Modified files:
    trunk/ext/zlib/zlib.c
Index: ext/zlib/zlib.c
===================================================================
--- ext/zlib/zlib.c	(revision 45624)
+++ ext/zlib/zlib.c	(revision 45625)
@@ -814,8 +814,7 @@ zstream_shift_buffer(struct zstream *z, https://github.com/ruby/ruby/blob/trunk/ext/zlib/zlib.c#L814
 	return zstream_detach_buffer(z);
     }
 
-    dst = rb_str_subseq(z->buf, 0, len);
-    rb_obj_reveal(dst, rb_cString);
+    dst = rb_str_new(RSTRING_PTR(z->buf), len);
     z->buf_filled -= len;
     memmove(RSTRING_PTR(z->buf), RSTRING_PTR(z->buf) + len,
 	    z->buf_filled);

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