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diff --git a/googleurl/src/url_canon_stdstring.h b/googleurl/src/url_canon_stdstring.h
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+// Copyright 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This header file defines a canonicalizer output method class for STL
+// strings. Because the canonicalizer tries not to be dependent on the STL,
+// we have segregated it here.
+
+#ifndef GOOGLEURL_SRC_URL_CANON_STRING_H__
+#define GOOGLEURL_SRC_URL_CANON_STRING_H__
+
+#include <string>
+#include "googleurl/src/url_canon.h"
+
+namespace url_canon {
+
+// Write into a std::string given in the constructor. This object odes not own
+// the string itself, and the user must ensure that the string stays alive
+// throughout the lifetime of this object.
+//
+// The given string will be appended to; any existing data in the string will
+// be preserved. The caller should reserve() the amount of data in the string
+// they expect to be written. We will resize if necessary, but that's slow.
+//
+// Note that when canonicalization is complete, the string will likely have
+// unused space at the end because we make the string very big to start out
+// with (by |initial_size|). This ends up being important because resize
+// operations are slow, and because the base class needs to write directly
+// into the buffer.
+//
+// Therefore, the user should call Complete() before using the string that
+// this class wrote into.
+class StdStringCanonOutput : public CanonOutput {
+ public:
+  StdStringCanonOutput(std::string* str)
+      : CanonOutput(),
+        str_(str) {
+    cur_len_ = static_cast<int>(str_->size());  // Append to existing data.
+    str_->resize(str_->capacity());
+    buffer_ = &(*str_)[0];
+    buffer_len_ = static_cast<int>(str_->size());
+  }
+  virtual ~StdStringCanonOutput() {
+    // Nothing to do, we don't own the string.
+  }
+
+  // Must be called after writing has completed but before the string is used.
+  void Complete() {
+    str_->resize(cur_len_);
+    buffer_len_ = cur_len_;
+  }
+
+  virtual void Resize(int sz) {
+    str_->resize(sz);
+    buffer_ = &(*str_)[0];
+    buffer_len_ = sz;
+  }
+
+ protected:
+   std::string* str_;
+};
+
+// An extension of the Replacements class that allows the setters to use
+// standard strings.
+//
+// The strings passed as arguments are not copied and must remain valid until
+// this class goes out of scope.
+template<typename STR>
+class StdStringReplacements :
+    public url_canon::Replacements<typename STR::value_type> {
+ public:
+  void SetSchemeStr(const STR& s) {
+    this->SetScheme(s.data(),
+                    url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetUsernameStr(const STR& s) {
+    this->SetUsername(s.data(),
+                      url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetPasswordStr(const STR& s) {
+    this->SetPassword(s.data(),
+                      url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetHostStr(const STR& s) {
+    this->SetHost(s.data(),
+                  url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetPortStr(const STR& s) {
+    this->SetPort(s.data(),
+                  url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetPathStr(const STR& s) {
+    this->SetPath(s.data(),
+                  url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetQueryStr(const STR& s) {
+    this->SetQuery(s.data(),
+                   url_parse::Component(0, static_cast<int>(s.length())));
+  }
+  void SetRefStr(const STR& s) {
+    this->SetRef(s.data(),
+                 url_parse::Component(0, static_cast<int>(s.length())));
+  }
+};
+
+}  // namespace url_canon
+
+#endif  // GOOGLEURL_SRC_URL_CANON_STRING_H__