net/base/net_util_win.cc

   1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/net_util.h"
   6
   7 #include "base/file_path.h"
   8 #include "base/string_piece.h"
   9 #include "base/string_util.h"
  10 #include "base/sys_string_conversions.h"
  11 #include "googleurl/src/gurl.h"
  12 #include "net/base/escape.h"
  13
  14 namespace net {
  15
  16 bool FileURLToFilePath(const GURL& url, FilePath* file_path) {
  17   *file_path = FilePath();
  18   std::wstring& file_path_str = const_cast<std::wstring&>(file_path->value());
  19   file_path_str.clear();
  20
  21   if (!url.is_valid())
  22     return false;
  23
  24   std::string path;
  25   std::string host = url.host();
  26   if (host.empty()) {
  27     // URL contains no host, the path is the filename. In this case, the path
  28     // will probably be preceeded with a slash, as in "/C:/foo.txt", so we
  29     // trim out that here.
  30     path = url.path();
  31     size_t first_non_slash = path.find_first_not_of("/\\");
  32     if (first_non_slash != std::string::npos && first_non_slash > 0)
  33       path.erase(0, first_non_slash);
  34   } else {
  35     // URL contains a host: this means it's UNC. We keep the preceeding slash
  36     // on the path.
  37     path = "\\\\";
  38     path.append(host);
  39     path.append(url.path());
  40   }
  41
  42   if (path.empty())
  43     return false;
  44   std::replace(path.begin(), path.end(), '/', '\\');
  45
  46   // GURL stores strings as percent-encoded UTF-8, this will undo if possible.
  47   path = UnescapeURLComponent(path,
  48       UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
  49
  50   if (!IsStringUTF8(path)) {
  51     // Not UTF-8, assume encoding is native codepage and we're done. We know we
  52     // are giving the conversion function a nonempty string, and it may fail if
  53     // the given string is not in the current encoding and give us an empty
  54     // string back. We detect this and report failure.
  55     file_path_str = base::SysNativeMBToWide(path);
  56     return !file_path_str.empty();
  57   }
  58   file_path_str.assign(UTF8ToWide(path));
  59
  60   // We used to try too hard and see if |path| made up entirely of
  61   // the 1st 256 characters in the Unicode was a zero-extended UTF-16.
  62   // If so, we converted it to 'Latin-1' and checked if the result was UTF-8.
  63   // If the check passed, we converted the result to UTF-8.
  64   // Otherwise, we treated the result as the native OS encoding.
  65   // However, that led to http://crbug.com/4619 and http://crbug.com/14153
  66   return true;
  67 }
  68
  69 }  // namespace net