| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.impl.io; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.hc.core5.http.StreamClosedException; |
| import org.apache.hc.core5.http.io.SessionOutputBuffer; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Output stream that cuts off after a defined number of bytes. This class |
| * is used to send content of HTTP messages where the end of the content entity |
| * is determined by the value of the {@code Content-Length header}. |
| * Entities transferred using this stream can be maximum {@link Long#MAX_VALUE} |
| * long. |
| * <p> |
| * Note that this class NEVER closes the underlying stream, even when close |
| * gets called. Instead, the stream will be marked as closed and no further |
| * output will be permitted. |
| * |
| * @since 4.0 |
| */ |
| public class ContentLengthOutputStream extends OutputStream { |
| |
| private final SessionOutputBuffer buffer; |
| private final OutputStream outputStream; |
| |
| /** |
| * The maximum number of bytes that can be written the stream. Subsequent |
| * write operations will be ignored. |
| */ |
| private final long contentLength; |
| |
| /** Total bytes written */ |
| private long total; |
| |
| /** True if the stream is closed. */ |
| private boolean closed; |
| |
| /** |
| * Default constructor. |
| * |
| * @param buffer Session output buffer |
| * @param outputStream Output stream |
| * @param contentLength The maximum number of bytes that can be written to |
| * the stream. Subsequent write operations will be ignored. |
| * |
| * @since 4.0 |
| */ |
| public ContentLengthOutputStream(final SessionOutputBuffer buffer, final OutputStream outputStream, final long contentLength) { |
| super(); |
| this.buffer = Args.notNull(buffer, "Session output buffer"); |
| this.outputStream = Args.notNull(outputStream, "Output stream"); |
| this.contentLength = Args.notNegative(contentLength, "Content length"); |
| } |
| |
| /** |
| * <p>Does not close the underlying socket output.</p> |
| * |
| * @throws IOException If an I/O problem occurs. |
| */ |
| @Override |
| public void close() throws IOException { |
| if (!this.closed) { |
| this.closed = true; |
| this.buffer.flush(this.outputStream); |
| } |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| this.buffer.flush(this.outputStream); |
| } |
| |
| @Override |
| public void write(final byte[] b, final int off, final int len) throws IOException { |
| if (this.closed) { |
| throw new StreamClosedException(); |
| } |
| if (this.total < this.contentLength) { |
| final long max = this.contentLength - this.total; |
| int chunk = len; |
| if (chunk > max) { |
| chunk = (int) max; |
| } |
| this.buffer.write(b, off, chunk, this.outputStream); |
| this.total += chunk; |
| } |
| } |
| |
| @Override |
| public void write(final byte[] b) throws IOException { |
| write(b, 0, b.length); |
| } |
| |
| @Override |
| public void write(final int b) throws IOException { |
| if (this.closed) { |
| throw new StreamClosedException(); |
| } |
| if (this.total < this.contentLength) { |
| this.buffer.write(b, this.outputStream); |
| this.total++; |
| } |
| } |
| |
| } |