mirror of
https://github.com/openjdk/jdk.git
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275 lines
8.7 KiB
Java
275 lines
8.7 KiB
Java
/*
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* Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.channels.IllegalBlockingModeException;
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import java.nio.channels.ReadableByteChannel;
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import java.nio.channels.SeekableByteChannel;
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import java.nio.channels.SelectableChannel;
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import java.nio.channels.WritableByteChannel;
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import java.util.Arrays;
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import java.util.Objects;
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import jdk.internal.util.ArraysSupport;
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/**
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* This class is defined here rather than in java.nio.channels.Channels
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* so that code can be shared with SocketAdaptor.
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*
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* @author Mike McCloskey
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* @author Mark Reinhold
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* @since 1.4
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*/
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public class ChannelInputStream
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extends InputStream
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{
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private static final int DEFAULT_BUFFER_SIZE = 8192;
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public static int read(ReadableByteChannel ch, ByteBuffer bb,
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boolean block)
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throws IOException
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{
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if (ch instanceof SelectableChannel sc) {
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synchronized (sc.blockingLock()) {
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boolean bm = sc.isBlocking();
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if (!bm)
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throw new IllegalBlockingModeException();
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if (bm != block)
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sc.configureBlocking(block);
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int n = ch.read(bb);
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if (bm != block)
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sc.configureBlocking(bm);
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return n;
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}
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} else {
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return ch.read(bb);
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}
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}
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protected final ReadableByteChannel ch;
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private ByteBuffer bb = null;
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private byte[] bs = null; // Invoker's previous array
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private byte[] b1 = null;
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public ChannelInputStream(ReadableByteChannel ch) {
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this.ch = ch;
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}
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public synchronized int read() throws IOException {
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if (b1 == null)
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b1 = new byte[1];
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int n = this.read(b1);
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if (n == 1)
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return b1[0] & 0xff;
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return -1;
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}
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public synchronized int read(byte[] bs, int off, int len)
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throws IOException
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{
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Objects.checkFromIndexSize(off, len, bs.length);
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if (len == 0)
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return 0;
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ByteBuffer bb = ((this.bs == bs)
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? this.bb
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: ByteBuffer.wrap(bs));
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bb.limit(Math.min(off + len, bb.capacity()));
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bb.position(off);
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this.bb = bb;
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this.bs = bs;
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return read(bb);
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}
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protected int read(ByteBuffer bb)
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throws IOException
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{
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return ChannelInputStream.read(ch, bb, true);
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}
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@Override
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public byte[] readAllBytes() throws IOException {
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if (!(ch instanceof SeekableByteChannel sbc))
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return super.readAllBytes();
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long length = sbc.size();
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long position = sbc.position();
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long size = length - position;
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if (length <= 0 || size <= 0)
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return super.readAllBytes();
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if (size > (long) Integer.MAX_VALUE) {
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String msg =
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String.format("Required array size too large: %d = %d - %d",
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size, length, position);
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throw new OutOfMemoryError(msg);
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}
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int capacity = (int)size;
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byte[] buf = new byte[capacity];
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int nread = 0;
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int n;
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for (;;) {
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// read to EOF which may read more or less than initial size, e.g.,
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// file is truncated while we are reading
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while ((n = read(buf, nread, capacity - nread)) > 0)
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nread += n;
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// if last call to read() returned -1, we are done; otherwise,
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// try to read one more byte and if that fails we're done too
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if (n < 0 || (n = read()) < 0)
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break;
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// one more byte was read; need to allocate a larger buffer
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capacity = Math.max(ArraysSupport.newLength(capacity,
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1, // min growth
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capacity), // pref growth
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DEFAULT_BUFFER_SIZE);
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buf = Arrays.copyOf(buf, capacity);
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buf[nread++] = (byte)n;
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}
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return (capacity == nread) ? buf : Arrays.copyOf(buf, nread);
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}
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@Override
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public byte[] readNBytes(int len) throws IOException {
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if (len < 0)
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throw new IllegalArgumentException("len < 0");
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if (len == 0)
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return new byte[0];
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if (!(ch instanceof SeekableByteChannel sbc))
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return super.readNBytes(len);
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long length = sbc.size();
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long position = sbc.position();
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long size = length - position;
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if (length <= 0 || size <= 0)
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return super.readNBytes(len);
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int capacity = (int)Math.min(len, size);
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byte[] buf = new byte[capacity];
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int remaining = capacity;
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int nread = 0;
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int n;
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do {
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n = read(buf, nread, remaining);
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if (n > 0) {
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nread += n;
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remaining -= n;
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} else if (n == 0) {
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// Block until a byte is read or EOF is detected
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byte b = (byte)read();
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if (b == -1 )
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break;
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buf[nread++] = b;
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remaining--;
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}
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} while (n >= 0 && remaining > 0);
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return (capacity == nread) ? buf : Arrays.copyOf(buf, nread);
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}
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public int available() throws IOException {
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// special case where the channel is to a file
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if (ch instanceof SeekableByteChannel sbc) {
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long rem = Math.max(0, sbc.size() - sbc.position());
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return (rem > Integer.MAX_VALUE) ? Integer.MAX_VALUE : (int)rem;
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}
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return 0;
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}
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public synchronized long skip(long n) throws IOException {
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// special case where the channel is to a file
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if (ch instanceof SeekableByteChannel sbc) {
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long pos = sbc.position();
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long newPos;
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if (n > 0) {
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newPos = pos + n;
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long size = sbc.size();
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if (newPos < 0 || newPos > size) {
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newPos = size;
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}
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} else {
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newPos = Long.max(pos + n, 0);
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}
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sbc.position(newPos);
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return newPos - pos;
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}
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return super.skip(n);
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}
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public void close() throws IOException {
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ch.close();
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}
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@Override
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public long transferTo(OutputStream out) throws IOException {
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Objects.requireNonNull(out, "out");
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if (out instanceof ChannelOutputStream cos
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&& ch instanceof FileChannel fc) {
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WritableByteChannel wbc = cos.channel();
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if (wbc instanceof FileChannel dst) {
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return transfer(fc, dst);
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}
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if (wbc instanceof SelectableChannel sc) {
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synchronized (sc.blockingLock()) {
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if (!sc.isBlocking())
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throw new IllegalBlockingModeException();
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return transfer(fc, wbc);
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}
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}
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return transfer(fc, wbc);
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}
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return super.transferTo(out);
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}
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private static long transfer(FileChannel src, WritableByteChannel dst) throws IOException {
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long initialPos = src.position();
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long pos = initialPos;
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try {
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while (pos < src.size()) {
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pos += src.transferTo(pos, Long.MAX_VALUE, dst);
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}
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} finally {
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src.position(pos);
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}
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return pos - initialPos;
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}
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}
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