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