157 lines
4.9 KiB
Java
157 lines
4.9 KiB
Java
/*
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* Copyright 2019 Hippo Seven
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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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package com.hippo.ehviewer.gallery;
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import androidx.annotation.NonNull;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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class Pipe {
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private final int capacity;
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private final byte[] buffer;
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private int head = 0;
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private int tail = 0;
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private boolean full = false;
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private boolean inClosed = false;
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private boolean outClosed = false;
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private final InputStream inputStream = new InputStream() {
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@Override
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public int read() throws IOException {
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synchronized (Pipe.this) {
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byte[] bytes = new byte[1];
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if (read(bytes, 0, 1) != -1) {
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return bytes[0];
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} else {
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return -1;
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}
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}
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}
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@Override
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public int read(@NonNull byte[] b, int off, int len) throws IOException {
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synchronized (Pipe.this) {
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for (; ; ) {
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if (inClosed) {
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throw new IOException("The InputStream is closed");
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}
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if (len == 0) {
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return 0;
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}
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if (head == tail && !full) {
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if (outClosed) {
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// No bytes available and the OutputStream is closed. So it's the end.
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return -1;
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} else {
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// Wait for OutputStream write bytes
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try {
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Pipe.this.wait();
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} catch (InterruptedException e) {
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throw new IOException("The thread interrupted", e);
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}
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}
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} else {
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int read = Math.min(len, (head < tail ? tail : capacity) - head);
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System.arraycopy(buffer, head, b, off, read);
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head += read;
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if (head == capacity) {
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head = 0;
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}
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full = false;
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Pipe.this.notifyAll();
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return read;
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}
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}
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}
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}
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@Override
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public void close() {
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synchronized (Pipe.this) {
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inClosed = true;
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Pipe.this.notifyAll();
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}
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}
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};
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private final OutputStream outputStream = new OutputStream() {
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@Override
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public void write(int b) throws IOException {
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synchronized (Pipe.this) {
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byte[] bytes = new byte[]{(byte) b};
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write(bytes, 0, 1);
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}
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}
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@Override
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public void write(@NonNull byte[] b, int off, int len) throws IOException {
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synchronized (Pipe.this) {
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while (len != 0) {
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if (head == tail && full) {
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// The buffer is full, wait for InputStream read bytes
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try {
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Pipe.this.wait();
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} catch (InterruptedException e) {
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throw new IOException("The thread interrupted", e);
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}
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} else {
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int write = Math.min(len, (head <= tail ? capacity : head) - tail);
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System.arraycopy(b, off, buffer, tail, write);
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off += write;
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len -= write;
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tail += write;
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if (tail == capacity) {
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tail = 0;
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}
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if (head == tail) {
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full = true;
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}
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Pipe.this.notifyAll();
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}
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}
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}
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}
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@Override
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public void close() {
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synchronized (Pipe.this) {
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outClosed = true;
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Pipe.this.notifyAll();
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}
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}
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};
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Pipe(int capacity) {
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this.capacity = capacity;
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this.buffer = new byte[capacity];
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}
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InputStream getInputStream() {
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return inputStream;
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}
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OutputStream getOutputStream() {
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return outputStream;
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}
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}
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