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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef EVENT_LOG_LIST_BUILDER_H_
#define EVENT_LOG_LIST_BUILDER_H_
#include <cstdint>
#include <memory>
#include <android-base/macros.h>
// EventLogListBuilder provides a mechanism to build an EventLog list
// consisting of int and string EventLog values.
//
// NOTE: This class does not provide the ability to append an embedded list,
// i.e., a list containing a list.
class EventLogListBuilder {
public:
EventLogListBuilder();
// Append a single value of a specified type.
bool Append(int value);
bool Append(const std::string& value);
// Finalizes construction of the EventLog list and releases the data
// to the caller. Caller takes ownership of the payload. No further calls
// to append* may be made once the payload is acquired by the caller.
void Release(std::unique_ptr<uint8_t[]>* log, size_t* size);
private:
// Appends |data| of the given |size| to the payload.
void AppendData(const void* data, size_t size);
// Appends a single byte to the payload.
void AppendByte(uint8_t byte);
// Returns true iff the remaining capacity in |payload_| is large enough to
// accommodate |value_size| bytes. The space required to log the event type
// is included in the internal calculation so must not be passed in to
// |value_size|.
bool IsSpaceAvailable(size_t value_size);
// The number of items in the EventLog list.
size_t payload_count_;
// The size of the data stored in |payload_|. Used to track where to insert
// new data.
size_t payload_size_;
// The payload constructed by calls to log*. The payload may only contain
// MAX_EVENT_PAYLOAD (512) bytes.
std::unique_ptr<uint8_t[]> payload_;
DISALLOW_COPY_AND_ASSIGN(EventLogListBuilder);
};
#endif // EVENT_LOG_LIST_BUILDER_H_
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