| /* |
| * ==================================================================== |
| * 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.nio; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.ReadableByteChannel; |
| |
| import org.apache.hc.core5.http.ConnectionClosedException; |
| import org.apache.hc.core5.http.impl.BasicHttpTransportMetrics; |
| import org.apache.hc.core5.http.nio.FileContentDecoder; |
| import org.apache.hc.core5.http.nio.SessionInputBuffer; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Content decoder that cuts off after a defined number of bytes. This class |
| * is used to receive 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> |
| * This decoder is optimized to transfer data directly from the underlying |
| * I/O session's channel to a {@link FileChannel}, whenever |
| * possible avoiding intermediate buffering in the session buffer. |
| * |
| * @since 4.0 |
| */ |
| public class LengthDelimitedDecoder extends AbstractContentDecoder implements FileContentDecoder { |
| |
| private final long contentLength; |
| |
| private long len; |
| |
| public LengthDelimitedDecoder( |
| final ReadableByteChannel channel, |
| final SessionInputBuffer buffer, |
| final BasicHttpTransportMetrics metrics, |
| final long contentLength) { |
| super(channel, buffer, metrics); |
| Args.notNegative(contentLength, "Content length"); |
| this.contentLength = contentLength; |
| } |
| |
| @Override |
| public int read(final ByteBuffer dst) throws IOException { |
| Args.notNull(dst, "Byte buffer"); |
| if (isCompleted()) { |
| return -1; |
| } |
| final int chunk = (int) Math.min((this.contentLength - this.len), Integer.MAX_VALUE); |
| |
| final int bytesRead; |
| if (this.buffer.hasData()) { |
| final int maxLen = Math.min(chunk, this.buffer.length()); |
| bytesRead = this.buffer.read(dst, maxLen); |
| } else { |
| bytesRead = readFromChannel(dst, chunk); |
| } |
| if (bytesRead == -1) { |
| setCompleted(); |
| if (this.len < this.contentLength) { |
| throw new ConnectionClosedException( |
| "Premature end of Content-Length delimited message body (expected: %d; received: %d)", |
| this.contentLength, this.len); |
| } |
| } |
| this.len += bytesRead; |
| if (this.len >= this.contentLength) { |
| this.completed = true; |
| } |
| if (this.completed && bytesRead == 0) { |
| return -1; |
| } |
| return bytesRead; |
| } |
| |
| @Override |
| public long transfer( |
| final FileChannel dst, |
| final long position, |
| final long count) throws IOException { |
| |
| if (dst == null) { |
| return 0; |
| } |
| if (isCompleted()) { |
| return -1; |
| } |
| |
| final int chunk = (int) Math.min((this.contentLength - this.len), Integer.MAX_VALUE); |
| |
| final long bytesRead; |
| if (this.buffer.hasData()) { |
| final int maxLen = Math.min(chunk, this.buffer.length()); |
| dst.position(position); |
| bytesRead = this.buffer.read(dst, count < maxLen ? (int)count : maxLen); |
| } else { |
| if (this.channel.isOpen()) { |
| if (position > dst.size()) { |
| throw new IOException(String.format("Position past end of file [%d > %d]", |
| position, dst.size())); |
| } |
| bytesRead = dst.transferFrom(this.channel, position, count < chunk ? count : chunk); |
| } else { |
| bytesRead = -1; |
| } |
| if (bytesRead > 0) { |
| this.metrics.incrementBytesTransferred(bytesRead); |
| } |
| } |
| if (bytesRead == -1) { |
| setCompleted(); |
| if (this.len < this.contentLength) { |
| throw new ConnectionClosedException( |
| "Premature end of Content-Length delimited message body (expected: %d; received: %d)", |
| this.contentLength, this.len); |
| } |
| } |
| this.len += bytesRead; |
| if (this.len >= this.contentLength) { |
| this.completed = true; |
| } |
| return bytesRead; |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append("[content length: "); |
| sb.append(this.contentLength); |
| sb.append("; pos: "); |
| sb.append(this.len); |
| sb.append("; completed: "); |
| sb.append(this.completed); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| } |