109 lines
3.9 KiB
Java
109 lines
3.9 KiB
Java
// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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// Licensed under the MIT License:
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package org.capnproto;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.ReadableByteChannel;
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public final class BufferedInputStreamWrapper implements BufferedInputStream {
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private final ReadableByteChannel inner;
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private final ByteBuffer buf;
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public BufferedInputStreamWrapper(ReadableByteChannel chan) {
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this.inner = chan;
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this.buf = ByteBuffer.allocate(8192);
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this.buf.limit(0);
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}
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public final int read(ByteBuffer dst) throws IOException {
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int numBytes = dst.remaining();
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if (numBytes < this.buf.remaining()) {
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//# Serve from the current buffer.
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ByteBuffer slice = this.buf.slice();
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slice.limit(numBytes);
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dst.put(slice);
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this.buf.position(this.buf.position() + numBytes);
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return numBytes;
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} else {
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//# Copy current available into destination.
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int fromFirstBuffer = this.buf.remaining();
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{
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ByteBuffer slice = this.buf.slice();
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slice.limit(fromFirstBuffer);
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dst.put(slice);
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}
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numBytes -= fromFirstBuffer;
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if (numBytes <= this.buf.capacity()) {
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//# Read the next buffer-full.
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this.buf.clear();
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int n = readAtLeast(this.inner, this.buf, numBytes);
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this.buf.rewind();
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ByteBuffer slice = this.buf.slice();
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slice.limit(numBytes);
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dst.put(slice);
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this.buf.limit(n);
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this.buf.position(numBytes);
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return fromFirstBuffer + numBytes;
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} else {
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//# Forward large read to the underlying stream.
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this.buf.clear();
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this.buf.limit(0);
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return fromFirstBuffer + readAtLeast(this.inner, dst, numBytes);
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}
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}
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}
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public final ByteBuffer getReadBuffer() throws IOException {
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if (this.buf.remaining() == 0) {
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this.buf.clear();
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int n = readAtLeast(this.inner, this.buf, 1);
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this.buf.rewind();
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this.buf.limit(n);
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}
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return this.buf;
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}
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public final void close() throws IOException {
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this.inner.close();
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}
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public final boolean isOpen() {
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return this.inner.isOpen();
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}
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public static int readAtLeast(ReadableByteChannel reader, ByteBuffer buf, int minBytes) throws IOException {
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int numRead = 0;
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while (numRead < minBytes) {
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int res = reader.read(buf);
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if (res < 0) {
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throw new DecodeException("premature EOF");
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}
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numRead += res;
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}
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return numRead;
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}
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}
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