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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /*
     18  *  Store data bytes in a variable-size queue.
     19  */
     20 
     21 #pragma once
     22 #include "NfcJniUtil.h"
     23 #include "gki.h"
     24 #include "Mutex.h"
     25 #include <list>
     26 
     27 
     28 class DataQueue
     29 {
     30 public:
     31     /*******************************************************************************
     32     **
     33     ** Function:        DataQueue
     34     **
     35     ** Description:     Initialize member variables.
     36     **
     37     ** Returns:         None.
     38     **
     39     *******************************************************************************/
     40     DataQueue ();
     41 
     42 
     43     /*******************************************************************************
     44     **
     45     ** Function:        ~DataQueue
     46     **
     47     ** Description:      Release all resources.
     48     **
     49     ** Returns:         None.
     50     **
     51     *******************************************************************************/
     52     ~DataQueue ();
     53 
     54 
     55     /*******************************************************************************
     56     **
     57     ** Function:        enqueue
     58     **
     59     ** Description:     Append data to the queue.
     60     **                  data: array of bytes
     61     **                  dataLen: length of the data.
     62     **
     63     ** Returns:         True if ok.
     64     **
     65     *******************************************************************************/
     66     bool enqueue (UINT8* data, UINT16 dataLen);
     67 
     68 
     69     /*******************************************************************************
     70     **
     71     ** Function:        dequeue
     72     **
     73     ** Description:     Retrieve and remove data from the front of the queue.
     74     **                  buffer: array to store the data.
     75     **                  bufferMaxLen: maximum size of the buffer.
     76     **                  actualLen: actual length of the data.
     77     **
     78     ** Returns:         True if ok.
     79     **
     80     *******************************************************************************/
     81     bool dequeue (UINT8* buffer, UINT16 bufferMaxLen, UINT16& actualLen);
     82 
     83 
     84     /*******************************************************************************
     85     **
     86     ** Function:        isEmpty
     87     **
     88     ** Description:     Whether the queue is empty.
     89     **
     90     ** Returns:         True if empty.
     91     **
     92     *******************************************************************************/
     93     bool isEmpty();
     94 
     95 private:
     96     struct tHeader
     97     {
     98         UINT16 mDataLen; //number of octets of data
     99         UINT16 mOffset; //offset of the first octet of data
    100     };
    101     typedef std::list<tHeader*> Queue;
    102 
    103     Queue mQueue;
    104     Mutex mMutex;
    105 };
    106 
    107