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89 lines
2.3 KiB
89 lines
2.3 KiB
/* |
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* Copyright (C) 2008 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include <stdint.h> |
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#include <errno.h> |
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#include <poll.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <sys/cdefs.h> |
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#include <sys/types.h> |
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#include <linux/input.h> |
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#include <cutils/log.h> |
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#include "InputEventReader.h" |
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/*****************************************************************************/ |
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struct input_event; |
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InputEventCircularReader::InputEventCircularReader(size_t numEvents) |
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: mBuffer(new input_event[numEvents * 2]), |
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mBufferEnd(mBuffer + numEvents), |
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mHead(mBuffer), |
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mCurr(mBuffer), |
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mFreeSpace(numEvents) |
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{ |
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} |
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InputEventCircularReader::~InputEventCircularReader() |
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{ |
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delete [] mBuffer; |
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} |
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ssize_t InputEventCircularReader::fill(int fd) |
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{ |
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size_t numEventsRead = 0; |
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if (mFreeSpace) { |
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const ssize_t nread = read(fd, mHead, mFreeSpace * sizeof(input_event)); |
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if (nread<0 || nread % sizeof(input_event)) { |
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// we got a partial event!! |
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return nread<0 ? -errno : -EINVAL; |
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} |
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numEventsRead = nread / sizeof(input_event); |
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if (numEventsRead) { |
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mHead += numEventsRead; |
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mFreeSpace -= numEventsRead; |
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if (mHead > mBufferEnd) { |
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size_t s = mHead - mBufferEnd; |
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memcpy(mBuffer, mBufferEnd, s * sizeof(input_event)); |
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mHead = mBuffer + s; |
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} |
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} |
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} |
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return numEventsRead; |
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} |
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ssize_t InputEventCircularReader::readEvent(input_event const** events) |
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{ |
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*events = mCurr; |
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ssize_t available = (mBufferEnd - mBuffer) - mFreeSpace; |
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return available ? 1 : 0; |
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} |
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void InputEventCircularReader::next() |
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{ |
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mCurr++; |
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mFreeSpace++; |
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if (mCurr >= mBufferEnd) { |
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mCurr = mBuffer; |
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} |
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}
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