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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_
#define CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_
#include <windows.h>
#include <memory>
// A container for a registry key, its values, and its subkeys. We don't use
// more obvious methods for various reasons:
// - RegCopyTree isn't supported pre-Vista, so we'd have to do something
// different for XP anyway.
// - SHCopyKey can't copy subkeys into a volatile destination, so we'd have to
// worry about polluting the registry.
// We don't persist security attributes since we only delete keys that we own,
// and we don't set custom attributes on them anyway.
class RegistryKeyBackup {
public:
RegistryKeyBackup();
RegistryKeyBackup(const RegistryKeyBackup&) = delete;
RegistryKeyBackup& operator=(const RegistryKeyBackup&) = delete;
~RegistryKeyBackup();
// Recursively reads |key_path| into this instance. Backing up a non-existent
// key is valid. Returns true if the backup was successful; false otherwise,
// in which case the state of this instance is not modified.
bool Initialize(HKEY root, const wchar_t* key_path, REGSAM wow64_acccess);
// Writes the contents of this instance into |key|. The contents of
// |key_path| are not modified If this instance is uninitialized or was
// initialized from a non-existent key.
bool WriteTo(HKEY root, const wchar_t* key_path, REGSAM wow64_acccess) const;
void swap(RegistryKeyBackup& other) { key_data_.swap(other.key_data_); }
private:
class KeyData;
// The values and subkeys of the backed-up key.
std::unique_ptr<KeyData> key_data_;
};
#endif // CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_
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