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59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/base/platform_mime_util.h"
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#include <string>
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#include "base/strings/utf_string_conversions.h"
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#include "base/win/registry.h"
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#include <windows.h>
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namespace net {
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bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
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const base::FilePath::StringType& ext, std::string* result) const {
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// check windows registry for file extension's mime type (registry key
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// names are not case-sensitive).
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std::wstring value, key = L"." + ext;
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base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ).ReadValue(
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L"Content Type", &value);
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if (!value.empty()) {
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*result = base::WideToUTF8(value);
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return true;
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}
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return false;
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}
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bool PlatformMimeUtil::GetPlatformPreferredExtensionForMimeType(
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const std::string& mime_type,
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base::FilePath::StringType* ext) const {
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std::wstring key(
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L"MIME\\Database\\Content Type\\" + base::UTF8ToWide(mime_type));
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if (base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ).ReadValue(
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L"Extension", ext) != ERROR_SUCCESS) {
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return false;
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}
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// Strip off the leading dot, this should always be the case.
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if (!ext->empty() && ext->at(0) == L'.')
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ext->erase(ext->begin());
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return true;
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}
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void PlatformMimeUtil::GetPlatformExtensionsForMimeType(
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const std::string& mime_type,
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std::unordered_set<base::FilePath::StringType>* extensions) const {
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// Multiple extensions could have the given mime type specified as their types
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// in their 'HKCR\.<extension>\Content Type' keys. Iterating all the HKCR
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// entries, though, is wildly impractical. Cheat by returning just the
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// preferred extension.
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base::FilePath::StringType ext;
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if (GetPlatformPreferredExtensionForMimeType(mime_type, &ext))
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extensions->insert(ext);
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}
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} // namespace net
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