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// Copyright (c) 2011 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 "chrome/installer/util/set_reg_value_work_item.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "base/win/registry.h"
#include "chrome/installer/util/logging_installer.h"
SetRegValueWorkItem::~SetRegValueWorkItem() {
}
SetRegValueWorkItem::SetRegValueWorkItem(HKEY predefined_root,
const std::wstring& key_path,
const std::wstring& value_name,
const std::wstring& value_data,
bool overwrite)
: predefined_root_(predefined_root),
key_path_(key_path),
value_name_(value_name),
overwrite_(overwrite),
status_(SET_VALUE),
type_(REG_SZ),
previous_type_(0) {
const uint8* data = reinterpret_cast<const uint8*>(value_data.c_str());
value_.assign(data, data + (value_data.length() + 1) * sizeof(wchar_t));
}
SetRegValueWorkItem::SetRegValueWorkItem(HKEY predefined_root,
const std::wstring& key_path,
const std::wstring& value_name,
DWORD value_data,
bool overwrite)
: predefined_root_(predefined_root),
key_path_(key_path),
value_name_(value_name),
overwrite_(overwrite),
status_(SET_VALUE),
type_(REG_DWORD),
previous_type_(0) {
const uint8* data = reinterpret_cast<const uint8*>(&value_data);
value_.assign(data, data + sizeof(value_data));
}
SetRegValueWorkItem::SetRegValueWorkItem(HKEY predefined_root,
const std::wstring& key_path,
const std::wstring& value_name,
int64 value_data,
bool overwrite)
: predefined_root_(predefined_root),
key_path_(key_path),
value_name_(value_name),
overwrite_(overwrite),
status_(SET_VALUE),
type_(REG_QWORD),
previous_type_(0) {
const uint8* data = reinterpret_cast<const uint8*>(&value_data);
value_.assign(data, data + sizeof(value_data));
}
bool SetRegValueWorkItem::Do() {
LONG result = ERROR_SUCCESS;
base::win::RegKey key;
if (status_ != SET_VALUE) {
// we already did something.
VLOG(1) << "multiple calls to Do()";
result = ERROR_CANTWRITE;
return ignore_failure_;
}
status_ = VALUE_UNCHANGED;
result = key.Open(predefined_root_, key_path_.c_str(),
KEY_READ | KEY_SET_VALUE);
if (result != ERROR_SUCCESS) {
VLOG(1) << "can not open " << key_path_ << " error: " << result;
return ignore_failure_;
}
DWORD type = 0;
DWORD size = 0;
result = key.ReadValue(value_name_.c_str(), NULL, &size, &type);
// If the value exists but we don't want to overwrite then there's
// nothing more to do.
if ((result != ERROR_FILE_NOT_FOUND) && !overwrite_) {
return true;
}
// If there's something to be saved, save it.
if (result == ERROR_SUCCESS) {
if (!size) {
previous_type_ = type;
} else {
previous_value_.resize(size);
result = key.ReadValue(value_name_.c_str(), &previous_value_[0], &size,
&previous_type_);
if (result != ERROR_SUCCESS) {
previous_value_.clear();
VLOG(1) << "Failed to save original value. Error: " << result;
}
}
}
result = key.WriteValue(value_name_.c_str(), &value_[0],
static_cast<DWORD>(value_.size()), type_);
if (result != ERROR_SUCCESS) {
VLOG(1) << "Failed to write value " << key_path_ << " error: " << result;
return ignore_failure_;
}
status_ = previous_type_ ? VALUE_OVERWRITTEN : NEW_VALUE_CREATED;
return true;
}
void SetRegValueWorkItem::Rollback() {
if (ignore_failure_)
return;
if (status_ == SET_VALUE || status_ == VALUE_ROLL_BACK)
return;
if (status_ == VALUE_UNCHANGED) {
status_ = VALUE_ROLL_BACK;
VLOG(1) << "rollback: setting unchanged, nothing to do";
return;
}
base::win::RegKey key;
LONG result = key.Open(predefined_root_, key_path_.c_str(), KEY_SET_VALUE);
if (result != ERROR_SUCCESS) {
VLOG(1) << "rollback: can not open " << key_path_ << " error: " << result;
return;
}
if (status_ == NEW_VALUE_CREATED) {
result = key.DeleteValue(value_name_.c_str());
VLOG(1) << "rollback: deleting " << value_name_ << " error: " << result;
} else if (status_ == VALUE_OVERWRITTEN) {
const unsigned char* previous_value =
previous_value_.empty() ? NULL : &previous_value_[0];
result = key.WriteValue(value_name_.c_str(), previous_value,
static_cast<DWORD>(previous_value_.size()),
previous_type_);
VLOG(1) << "rollback: restoring " << value_name_ << " error: " << result;
} else {
NOTREACHED();
}
status_ = VALUE_ROLL_BACK;
}
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