net/base/platform_mime_util_linux.cc

   1 // Copyright (c) 2012 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/platform_mime_util.h"
   6
   7 #include <string>
   8
   9 #include "base/logging.h"
  10 #include "build/build_config.h"
  11
  12 #if defined(OS_ANDROID)
  13 #include "net/android/network_library.h"
  14 #else
  15 #include "base/nix/mime_util_xdg.h"
  16 #endif
  17
  18 namespace net {
  19
  20 #if defined(OS_ANDROID)
  21 bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
  22     const base::FilePath::StringType& ext, std::string* result) const {
  23   return android::GetMimeTypeFromExtension(ext, result);
  24 }
  25 #else
  26 bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
  27     const base::FilePath::StringType& ext, std::string* result) const {
  28   // TODO(thestig): This is a temporary hack until we can fix this
  29   // properly in test shell / webkit.
  30   // We have to play dumb and not return application/x-perl here
  31   // to make the reload-subframe-object layout test happy.
  32   if (ext == "pl")
  33     return false;
  34
  35   base::FilePath dummy_path("foo." + ext);
  36   std::string out = base::nix::GetFileMimeType(dummy_path);
  37
  38   // GetFileMimeType likes to return application/octet-stream
  39   // for everything it doesn't know - ignore that.
  40   if (out == "application/octet-stream" || out.empty())
  41     return false;
  42
  43   // GetFileMimeType returns image/x-ico because that's what's in the XDG
  44   // mime database. That database is the merger of the Gnome and KDE mime
  45   // databases. Apparently someone working on KDE in 2001 decided .ico
  46   // resolves to image/x-ico, whereas the rest of the world uses image/x-icon.
  47   // FWIW, image/vnd.microsoft.icon is the official IANA assignment.
  48   if (out == "image/x-ico")
  49     out = "image/x-icon";
  50
  51   *result = out;
  52   return true;
  53 }
  54
  55 #endif  // defined(OS_ANDROID)
  56
  57 struct MimeToExt {
  58   const char* mime_type;
  59   const char* ext;
  60 };
  61
  62 const struct MimeToExt mime_type_ext_map[] = {
  63   {"application/pdf", "pdf"},
  64   {"application/x-tar", "tar"},
  65   {"application/zip", "zip"},
  66   {"audio/mpeg", "mp3"},
  67   {"image/gif", "gif"},
  68   {"image/jpeg", "jpg"},
  69   {"image/png", "png"},
  70   {"text/html", "html"},
  71   {"video/mp4", "mp4"},
  72   {"video/mpeg", "mpg"},
  73   {"text/plain", "txt"},
  74   {"text/x-sh", "sh"},
  75 };
  76
  77 bool PlatformMimeUtil::GetPreferredExtensionForMimeType(
  78     const std::string& mime_type, base::FilePath::StringType* ext) const {
  79
  80   for (size_t x = 0;
  81        x < (sizeof(mime_type_ext_map) / sizeof(MimeToExt));
  82        x++) {
  83     if (mime_type_ext_map[x].mime_type == mime_type) {
  84       *ext = mime_type_ext_map[x].ext;
  85       return true;
  86     }
  87   }
  88
  89   // TODO(dhg): Fix this the right way by implementing what's said below.
  90   // Unlike GetPlatformMimeTypeFromExtension, this method doesn't have a
  91   // default list that it uses, but for now we are also returning false since
  92   // this doesn't really matter as much under Linux.
  93   //
  94   // If we wanted to do this properly, we would read the mime.cache file which
  95   // has a section where they assign a glob (*.gif) to a mimetype
  96   // (image/gif). We look up the "heaviest" glob for a certain mime type and
  97   // then then try to chop off "*.".
  98
  99   return false;
 100 }
 101
 102 void PlatformMimeUtil::GetPlatformExtensionsForMimeType(
 103     const std::string& mime_type,
 104     base::hash_set<base::FilePath::StringType>* extensions) const {
 105   base::FilePath::StringType ext;
 106   if (GetPreferredExtensionForMimeType(mime_type, &ext))
 107     extensions->insert(ext);
 108 }
 109
 110 }  // namespace net