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diff --git a/url/url_canon_internal_file.h b/url/url_canon_internal_file.h
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef URL_URL_CANON_INTERNAL_FILE_H_
+#define URL_URL_CANON_INTERNAL_FILE_H_
+
+// As with url_canon_internal.h, this file is intended to be included in
+// another C++ file where the template types are defined. This allows the
+// programmer to use this to use these functions for their own strings
+// types, without bloating the code by having inline templates used in
+// every call site.
+//
+// *** This file must be included after url_canon_internal as we depend on some
+// functions in it. ***
+
+
+#include "url/url_file.h"
+#include "url/url_parse_internal.h"
+
+namespace url {
+
+// Given a pointer into the spec, this copies and canonicalizes the drive
+// letter and colon to the output, if one is found. If there is not a drive
+// spec, it won't do anything. The index of the next character in the input
+// spec is returned (after the colon when a drive spec is found, the begin
+// offset if one is not).
+template<typename CHAR>
+static int FileDoDriveSpec(const CHAR* spec, int begin, int end,
+ CanonOutput* output) {
+ // The path could be one of several things: /foo/bar, c:/foo/bar, /c:/foo,
+ // (with backslashes instead of slashes as well).
+ int num_slashes = CountConsecutiveSlashes(spec, begin, end);
+ int after_slashes = begin + num_slashes;
+
+ if (!DoesBeginWindowsDriveSpec(spec, after_slashes, end))
+ return begin; // Haven't consumed any characters
+
+ // DoesBeginWindowsDriveSpec will ensure that the drive letter is valid
+ // and that it is followed by a colon/pipe.
+
+ // Normalize Windows drive letters to uppercase
+ if (spec[after_slashes] >= 'a' && spec[after_slashes] <= 'z')
+ output->push_back(spec[after_slashes] - 'a' + 'A');
+ else
+ output->push_back(static_cast<char>(spec[after_slashes]));
+
+ // Normalize the character following it to a colon rather than pipe.
+ output->push_back(':');
+ output->push_back('/');
+ return after_slashes + 2;
+}
+
+// FileDoDriveSpec will have already added the first backslash, so we need to
+// write everything following the slashes using the path canonicalizer.
+template<typename CHAR, typename UCHAR>
+static void FileDoPath(const CHAR* spec, int begin, int end,
+ CanonOutput* output) {
+ // Normalize the number of slashes after the drive letter. The path
+ // canonicalizer expects the input to begin in a slash already so
+ // doesn't check. We want to handle no-slashes
+ int num_slashes = CountConsecutiveSlashes(spec, begin, end);
+ int after_slashes = begin + num_slashes;
+
+ // Now use the regular path canonicalizer to canonicalize the rest of the
+ // path. We supply it with the path following the slashes. It won't prepend
+ // a slash because it assumes any nonempty path already starts with one.
+ // We explicitly filter out calls with no path here to prevent that case.
+ ParsedComponent sub_path(after_slashes, end - after_slashes);
+ if (sub_path.len > 0) {
+ // Give it a fake output component to write into. DoCanonicalizeFile will
+ // compute the full path component.
+ ParsedComponent fake_output_path;
+ URLCanonInternal<CHAR, UCHAR>::DoPath(
+ spec, sub_path, output, &fake_output_path);
+ }
+}
+
+template<typename CHAR, typename UCHAR>
+static bool DoCanonicalizeFileURL(const URLComponentSource<CHAR>& source,
+ const ParsedURL& parsed,
+ CanonOutput* output,
+ ParsedURL* new_parsed) {
+ // Things we don't set in file: URLs.
+ new_parsed->username = ParsedComponent(0, -1);
+ new_parsed->password = ParsedComponent(0, -1);
+ new_parsed->port = ParsedComponent(0, -1);
+
+ // Scheme (known, so we don't bother running it through the more
+ // complicated scheme canonicalizer).
+ new_parsed->scheme.begin = output->length();
+ output->push_back('f');
+ output->push_back('i');
+ output->push_back('l');
+ output->push_back('e');
+ new_parsed->scheme.len = output->length() - new_parsed->scheme.begin;
+ output->push_back(':');
+
+ // Write the separator for the host.
+ output->push_back('/');
+ output->push_back('/');
+
+ // Append the host. For many file URLs, this will be empty. For UNC, this
+ // will be present.
+ // TODO(brettw) This doesn't do any checking for host name validity. We
+ // should probably handle validity checking of UNC hosts differently than
+ // for regular IP hosts.
+ bool success = URLCanonInternal<CHAR, UCHAR>::DoHost(
+ source.host, parsed.host, output, &new_parsed->host);
+
+ // Write a separator for the start of the path. We'll ignore any slashes
+ // already at the beginning of the path.
+ new_parsed->path.begin = output->length();
+ output->push_back('/');
+
+ // Copies and normalizes the "c:" at the beginning, if present.
+ int after_drive = FileDoDriveSpec(source.path, parsed.path.begin,
+ parsed.path.end(), output);
+
+ // Copies the rest of the path
+ FileDoPath<CHAR, UCHAR>(source.path, after_drive, parsed.path.end(), output);
+ new_parsed->path.len = output->length() - new_parsed->path.begin;
+
+ // Things following the path we can use the standard canonicalizers for.
+ success &= URLCanonInternal<CHAR, UCHAR>::DoQuery(
+ source.query, parsed.query, output, &new_parsed->query);
+ success &= URLCanonInternal<CHAR, UCHAR>::DoRef(
+ source.ref, parsed.ref, output, &new_parsed->ref);
+
+ return success;
+}
+
+} // namespace url
+
+#endif // URL_URL_CANON_INTERNAL_FILE_H_
