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      1 /*
      2  * Copyright (C) 2008 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 #ifndef ANDROID_INPUT_EVENT_READER_H
     18 #define ANDROID_INPUT_EVENT_READER_H
     19 
     20 #include <stdint.h>
     21 #include <errno.h>
     22 #include <sys/cdefs.h>
     23 #include <sys/types.h>
     24 
     25 /*****************************************************************************/
     26 
     27 struct input_event;
     28 
     29 class InputEventCircularReader
     30 {
     31     struct input_event* const mBuffer;
     32     struct input_event* const mBufferEnd;
     33     struct input_event* mHead;
     34     struct input_event* mCurr;
     35     ssize_t mFreeSpace;
     36 
     37 public:
     38     InputEventCircularReader(size_t numEvents);
     39     ~InputEventCircularReader();
     40     ssize_t fill(int fd);
     41     ssize_t readEvent(input_event const** events);
     42     void next();
     43 };
     44 
     45 /*****************************************************************************/
     46 
     47 #endif  // ANDROID_INPUT_EVENT_READER_H
     48