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diff --git a/lib/prstreams/prstrms.h b/lib/prstreams/prstrms.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+ * Robin J. Maxwell 11-22-96
+ * Fredrik Roubert <roubert@google.com> 2010-07-23
+ * Matt Austern <austern@google.com> 2010-07-23
+ */
+
+#ifndef _PRSTRMS_H
+#define _PRSTRMS_H
+
+#include <cstddef>
+#include <istream>
+#include <ostream>
+#include <streambuf>
+
+#include "prio.h"
+
+#ifdef _MSC_VER
+// http://support.microsoft.com/kb/q168958/
+class PR_IMPLEMENT(std::_Mutex);
+class PR_IMPLEMENT(std::ios_base);
+#endif
+
+
+class PR_IMPLEMENT(PRfilebuf): public std::streambuf
+{
+public:
+    PRfilebuf();
+    PRfilebuf(PRFileDesc *fd);
+    PRfilebuf(PRFileDesc *fd, char_type *ptr, std::streamsize len);
+    virtual ~PRfilebuf();
+
+    bool is_open() const { return _fd != NULL; }
+
+    PRfilebuf *open(
+                  const char *name,
+                  std::ios_base::openmode flags,
+                  PRIntn mode);
+    PRfilebuf *attach(PRFileDesc *fd);
+    PRfilebuf *close();
+
+protected:
+    virtual std::streambuf *setbuf(char_type *ptr, std::streamsize len);
+    virtual pos_type seekoff(
+                         off_type offset,
+                         std::ios_base::seekdir dir,
+                         std::ios_base::openmode flags);
+    virtual pos_type seekpos(
+                         pos_type pos,
+                         std::ios_base::openmode flags) {
+        return seekoff(pos, std::ios_base::beg, flags);
+    }
+    virtual int sync();
+    virtual int_type underflow();
+    virtual int_type overflow(int_type c = traits_type::eof());
+
+    // TODO: Override pbackfail(), showmanyc(), uflow(), xsgetn(), and xsputn().
+
+private:
+    bool allocate();
+    void setb(char_type *buf_base, char_type *buf_end, bool user_buf);
+
+    PRFileDesc *_fd;
+    bool _opened;
+    bool _allocated;
+    bool _unbuffered;
+    bool _user_buf;
+    char_type *_buf_base;
+    char_type *_buf_end;
+};
+
+
+class PR_IMPLEMENT(PRifstream): public std::istream
+{
+public:
+    PRifstream();
+    PRifstream(PRFileDesc *fd);
+    PRifstream(PRFileDesc *fd, char_type *ptr, std::streamsize len);
+    PRifstream(const char *name, openmode flags = in, PRIntn mode = 0);
+    virtual ~PRifstream();
+
+    PRfilebuf *rdbuf() const { return &_filebuf; }
+    bool is_open() const { return _filebuf.is_open(); }
+
+    void open(const char *name, openmode flags = in, PRIntn mode = 0);
+    void attach(PRFileDesc *fd);
+    void close();
+
+private:
+    mutable PRfilebuf _filebuf;
+};
+
+
+class PR_IMPLEMENT(PRofstream): public std::ostream
+{
+public:
+    PRofstream();
+    PRofstream(PRFileDesc *fd);
+    PRofstream(PRFileDesc *fd, char_type *ptr, std::streamsize len);
+    PRofstream(const char *name, openmode flags = out, PRIntn mode = 0);
+    virtual ~PRofstream();
+
+    PRfilebuf *rdbuf() const { return &_filebuf; }
+    bool is_open() const { return _filebuf.is_open(); }
+
+    void open(const char *name, openmode flags = out, PRIntn mode = 0);
+    void attach(PRFileDesc *fd);
+    void close();
+
+private:
+    mutable PRfilebuf _filebuf;
+};
+
+
+class PR_IMPLEMENT(PRfstream): public std::iostream
+{
+public:
+    PRfstream();
+    PRfstream(PRFileDesc *fd);
+    PRfstream(PRFileDesc *fd, char_type *ptr, std::streamsize len);
+    PRfstream(const char *name, openmode flags = in | out, PRIntn mode = 0);
+    virtual ~PRfstream();
+
+    PRfilebuf *rdbuf() const { return &_filebuf; }
+    bool is_open() const { return _filebuf.is_open(); }
+
+    void open(const char *name, openmode flags = in | out, PRIntn mode = 0);
+    void attach(PRFileDesc *fd);
+    void close();
+
+private:
+    mutable PRfilebuf _filebuf;
+};
+
+
+#endif /* _PRSTRMS_H */