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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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