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- // Copyright (c) 2012 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.
- #include "net/base/platform_mime_util.h"
- #include <string>
- #include "base/strings/utf_string_conversions.h"
- #include "base/win/registry.h"
- #include <windows.h>
- namespace net {
- bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
- const base::FilePath::StringType& ext, std::string* result) const {
- // check windows registry for file extension's mime type (registry key
- // names are not case-sensitive).
- base::FilePath::StringType value, key = FILE_PATH_LITERAL(".") + ext;
- base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ)
- .ReadValue(L"Content Type", &value);
- if (!value.empty()) {
- *result = base::WideToUTF8(value);
- return true;
- }
- return false;
- }
- bool PlatformMimeUtil::GetPlatformPreferredExtensionForMimeType(
- const std::string& mime_type,
- base::FilePath::StringType* ext) const {
- base::FilePath::StringType key =
- L"MIME\\Database\\Content Type\\" + base::UTF8ToWide(mime_type);
- if (base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ)
- .ReadValue(L"Extension", ext) != ERROR_SUCCESS) {
- return false;
- }
- // Strip off the leading dot, this should always be the case.
- if (!ext->empty() && ext->front() == '.')
- ext->erase(ext->begin());
- return true;
- }
- void PlatformMimeUtil::GetPlatformExtensionsForMimeType(
- const std::string& mime_type,
- std::unordered_set<base::FilePath::StringType>* extensions) const {
- // Multiple extensions could have the given mime type specified as their types
- // in their 'HKCR\.<extension>\Content Type' keys. Iterating all the HKCR
- // entries, though, is wildly impractical. Cheat by returning just the
- // preferred extension.
- base::FilePath::StringType ext;
- if (GetPlatformPreferredExtensionForMimeType(mime_type, &ext))
- extensions->insert(ext);
- }
- } // namespace net
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