171 lines
4.4 KiB
Java
171 lines
4.4 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.net5.buffer;
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import static java.util.Objects.requireNonNull;
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import io.net5.util.CharsetUtil;
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import java.io.DataOutput;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* An {@link OutputStream} which writes data to a {@link ByteBuf}.
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* <p>
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* A write operation against this stream will occur at the {@code writerIndex}
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* of its underlying buffer and the {@code writerIndex} will increase during
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* the write operation.
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* <p>
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* This stream implements {@link DataOutput} for your convenience.
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* The endianness of the stream is not always big endian but depends on
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* the endianness of the underlying buffer.
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*
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* @see ByteBufInputStream
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*/
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public class ByteBufOutputStream extends OutputStream implements DataOutput {
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private final ByteBuf buffer;
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private final int startIndex;
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private DataOutputStream utf8out; // lazily-instantiated
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private boolean closed;
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/**
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* Creates a new stream which writes data to the specified {@code buffer}.
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*/
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public ByteBufOutputStream(ByteBuf buffer) {
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requireNonNull(buffer, "buffer");
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this.buffer = buffer;
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startIndex = buffer.writerIndex();
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}
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/**
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* Returns the number of written bytes by this stream so far.
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*/
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public int writtenBytes() {
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return buffer.writerIndex() - startIndex;
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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if (len == 0) {
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return;
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}
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buffer.writeBytes(b, off, len);
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}
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@Override
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public void write(byte[] b) throws IOException {
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buffer.writeBytes(b);
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}
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@Override
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public void write(int b) throws IOException {
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buffer.writeByte(b);
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}
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@Override
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public void writeBoolean(boolean v) throws IOException {
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buffer.writeBoolean(v);
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}
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@Override
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public void writeByte(int v) throws IOException {
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buffer.writeByte(v);
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}
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@Override
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public void writeBytes(String s) throws IOException {
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buffer.writeCharSequence(s, CharsetUtil.US_ASCII);
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}
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@Override
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public void writeChar(int v) throws IOException {
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buffer.writeChar(v);
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}
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@Override
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public void writeChars(String s) throws IOException {
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int len = s.length();
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for (int i = 0 ; i < len ; i ++) {
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buffer.writeChar(s.charAt(i));
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}
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}
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@Override
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public void writeDouble(double v) throws IOException {
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buffer.writeDouble(v);
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}
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@Override
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public void writeFloat(float v) throws IOException {
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buffer.writeFloat(v);
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}
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@Override
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public void writeInt(int v) throws IOException {
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buffer.writeInt(v);
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}
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@Override
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public void writeLong(long v) throws IOException {
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buffer.writeLong(v);
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}
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@Override
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public void writeShort(int v) throws IOException {
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buffer.writeShort((short) v);
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}
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@Override
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public void writeUTF(String s) throws IOException {
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DataOutputStream out = utf8out;
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if (out == null) {
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if (closed) {
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throw new IOException("The stream is closed");
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}
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// Suppress a warning since the stream is closed in the close() method
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utf8out = out = new DataOutputStream(this); // lgtm[java/output-resource-leak]
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}
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out.writeUTF(s);
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}
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/**
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* Returns the buffer where this stream is writing data.
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*/
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public ByteBuf buffer() {
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return buffer;
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}
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@Override
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public void close() throws IOException {
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if (closed) {
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return;
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}
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closed = true;
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try {
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super.close();
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} finally {
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if (utf8out != null) {
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utf8out.close();
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}
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}
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}
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}
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