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diff --git a/googleurl/src/url_canon_mailtourl.cc b/googleurl/src/url_canon_mailtourl.cc
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+// Copyright 2008, 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.
+
+// Functions for canonicalizing "mailto:" URLs.
+
+#include "googleurl/src/url_canon.h"
+#include "googleurl/src/url_canon_internal.h"
+#include "googleurl/src/url_file.h"
+#include "googleurl/src/url_parse_internal.h"
+
+namespace url_canon {
+
+namespace {
+
+
+template<typename CHAR, typename UCHAR>
+bool DoCanonicalizeMailtoURL(const URLComponentSource<CHAR>& source,
+                             const url_parse::Parsed& parsed,
+                             CanonOutput* output,
+                             url_parse::Parsed* new_parsed) {
+
+  // mailto: only uses {scheme, path, query} -- clear the rest.
+  new_parsed->username = url_parse::Component();
+  new_parsed->password = url_parse::Component();
+  new_parsed->host = url_parse::Component();
+  new_parsed->port = url_parse::Component();
+  new_parsed->ref = url_parse::Component();
+
+  // Scheme (known, so we don't bother running it through the more
+  // complicated scheme canonicalizer).
+  new_parsed->scheme.begin = output->length();
+  output->Append("mailto:", 7);
+  new_parsed->scheme.len = 6;
+
+  bool success = true;
+
+  // Path
+  if (parsed.path.is_valid()) {
+    new_parsed->path.begin = output->length();
+
+    // Copy the path using path URL's more lax escaping rules.
+    // We convert to UTF-8 and escape non-ASCII, but leave all
+    // ASCII characters alone.
+    int end = parsed.path.end();
+    for (int i = parsed.path.begin; i < end; ++i) {
+      UCHAR uch = static_cast<UCHAR>(source.path[i]);
+      if (uch < 0x20 || uch >= 0x80)
+        success &= AppendUTF8EscapedChar(source.path, &i, end, output);
+      else
+        output->push_back(static_cast<char>(uch));
+    }
+
+    new_parsed->path.len = output->length() - new_parsed->path.begin;
+  } else {
+    // No path at all
+    new_parsed->path.reset();
+  }
+
+  // Query -- always use the default utf8 charset converter.
+  CanonicalizeQuery(source.query, parsed.query, NULL,
+                    output, &new_parsed->query);
+
+  return success;
+}
+
+} // namespace
+
+bool CanonicalizeMailtoURL(const char* spec,
+                          int spec_len,
+                          const url_parse::Parsed& parsed,
+                          CanonOutput* output,
+                          url_parse::Parsed* new_parsed) {
+  return DoCanonicalizeMailtoURL<char, unsigned char>(
+      URLComponentSource<char>(spec), parsed, output, new_parsed);
+}
+
+bool CanonicalizeMailtoURL(const char16* spec,
+                           int spec_len,
+                           const url_parse::Parsed& parsed,
+                           CanonOutput* output,
+                           url_parse::Parsed* new_parsed) {
+  return DoCanonicalizeMailtoURL<char16, char16>(
+      URLComponentSource<char16>(spec), parsed, output, new_parsed);
+}
+
+bool ReplaceMailtoURL(const char* base,
+                      const url_parse::Parsed& base_parsed,
+                      const Replacements<char>& replacements,
+                      CanonOutput* output,
+                      url_parse::Parsed* new_parsed) {
+  URLComponentSource<char> source(base);
+  url_parse::Parsed parsed(base_parsed);
+  SetupOverrideComponents(base, replacements, &source, &parsed);
+  return DoCanonicalizeMailtoURL<char, unsigned char>(
+      source, parsed, output, new_parsed);
+}
+
+bool ReplaceMailtoURL(const char* base,
+                      const url_parse::Parsed& base_parsed,
+                      const Replacements<char16>& replacements,
+                      CanonOutput* output,
+                      url_parse::Parsed* new_parsed) {
+  RawCanonOutput<1024> utf8;
+  URLComponentSource<char> source(base);
+  url_parse::Parsed parsed(base_parsed);
+  SetupUTF16OverrideComponents(base, replacements, &utf8, &source, &parsed);
+  return DoCanonicalizeMailtoURL<char, unsigned char>(
+      source, parsed, output, new_parsed);
+}
+
+}  // namespace url_canon