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diff --git a/libxsd/xsd/cxx/zc-istream.hxx b/libxsd/xsd/cxx/zc-istream.hxx
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+++ b/libxsd/xsd/cxx/zc-istream.hxx
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+// file      : xsd/cxx/zc-istream.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2009 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef XSD_CXX_ZC_ISTREAM_HXX
+#define XSD_CXX_ZC_ISTREAM_HXX
+
+#include <string>
+#include <istream>
+
+#include <xsd/cxx/ro-string.hxx>
+
+namespace xsd
+{
+  namespace cxx
+  {
+    // Input streambuffer that does not copy the underlying
+    // buffer (zero copy).
+    //
+    template <typename C>
+    class zc_streambuf: public std::basic_streambuf<C>
+    {
+    public:
+      typedef typename std::basic_streambuf<C>::int_type int_type;
+      typedef typename std::basic_streambuf<C>::traits_type traits_type;
+
+    public:
+      zc_streambuf (const ro_string<C>&);
+      zc_streambuf (const std::basic_string<C>&);
+
+    protected:
+      virtual std::streamsize
+      showmanyc ();
+
+      virtual int_type
+      underflow ();
+
+    private:
+      void
+      init ();
+
+    private:
+      zc_streambuf (const zc_streambuf&);
+
+      zc_streambuf&
+      operator= (const zc_streambuf&);
+
+    private:
+      ro_string<C> str_;
+    };
+
+
+    // Input string stream that does not copy the underlying string.
+    //
+    template <typename C>
+    class zc_istream_base
+    {
+    protected:
+      zc_istream_base (const ro_string<C>&);
+      zc_istream_base (const std::basic_string<C>&);
+
+    protected:
+      zc_streambuf<C> buf_;
+    };
+
+    template <typename C>
+    class zc_istream: protected zc_istream_base<C>,
+                      public std::basic_istream<C>
+    {
+    public:
+      zc_istream (const ro_string<C>&);
+      zc_istream (const std::basic_string<C>&);
+
+      bool
+      exhausted ()
+      {
+        return this->get () == std::basic_istream<C>::traits_type::eof ();
+      }
+
+    private:
+      zc_istream (const zc_istream&);
+
+      zc_istream&
+      operator= (const zc_istream&);
+    };
+  }
+}
+
+#include <xsd/cxx/zc-istream.txx>
+
+#endif  // XSD_CXX_ZC_ISTREAM_HXX