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/*
* Copyright (C) 2012 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.
*/
/*
* Store data bytes in a variable-size queue.
*/
#pragma once
#include "NfcJniUtil.h"
#include "gki.h"
#include "Mutex.h"
#include <list>
class DataQueue
{
public:
/*******************************************************************************
**
** Function: DataQueue
**
** Description: Initialize member variables.
**
** Returns: None.
**
*******************************************************************************/
DataQueue ();
/*******************************************************************************
**
** Function: ~DataQueue
**
** Description: Release all resources.
**
** Returns: None.
**
*******************************************************************************/
~DataQueue ();
/*******************************************************************************
**
** Function: enqueue
**
** Description: Append data to the queue.
** data: array of bytes
** dataLen: length of the data.
**
** Returns: True if ok.
**
*******************************************************************************/
bool enqueue (UINT8* data, UINT16 dataLen);
/*******************************************************************************
**
** Function: dequeue
**
** Description: Retrieve and remove data from the front of the queue.
** buffer: array to store the data.
** bufferMaxLen: maximum size of the buffer.
** actualLen: actual length of the data.
**
** Returns: True if ok.
**
*******************************************************************************/
bool dequeue (UINT8* buffer, UINT16 bufferMaxLen, UINT16& actualLen);
/*******************************************************************************
**
** Function: isEmpty
**
** Description: Whether the queue is empty.
**
** Returns: True if empty.
**
*******************************************************************************/
bool isEmpty();
private:
struct tHeader
{
UINT16 mDataLen; //number of octets of data
UINT16 mOffset; //offset of the first octet of data
};
typedef std::list<tHeader*> Queue;
Queue mQueue;
Mutex mMutex;
};
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