| /* |
| * ==================================================================== |
| * 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.WritableByteChannel; |
| import java.util.List; |
| |
| import org.apache.hc.core5.http.FormattedHeader; |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.impl.BasicHttpTransportMetrics; |
| import org.apache.hc.core5.http.message.BasicLineFormatter; |
| import org.apache.hc.core5.http.nio.SessionOutputBuffer; |
| import org.apache.hc.core5.util.CharArrayBuffer; |
| |
| /** |
| * Implements chunked transfer coding. The content is sent in small chunks. |
| * Entities transferred using this decoder can be of unlimited length. |
| * |
| * @since 4.0 |
| */ |
| public class ChunkEncoder extends AbstractContentEncoder { |
| |
| private final int chunkSizeHint; |
| private final CharArrayBuffer lineBuffer; |
| |
| /** |
| * @param channel underlying channel. |
| * @param buffer session buffer. |
| * @param metrics transport metrics. |
| * |
| * @since 5.0 |
| */ |
| public ChunkEncoder( |
| final WritableByteChannel channel, |
| final SessionOutputBuffer buffer, |
| final BasicHttpTransportMetrics metrics, |
| final int chunkSizeHint) { |
| super(channel, buffer, metrics); |
| this.chunkSizeHint = chunkSizeHint > 0 ? chunkSizeHint : 0; |
| this.lineBuffer = new CharArrayBuffer(16); |
| } |
| |
| public ChunkEncoder( |
| final WritableByteChannel channel, |
| final SessionOutputBuffer buffer, |
| final BasicHttpTransportMetrics metrics) { |
| this(channel, buffer, metrics, 0); |
| } |
| |
| @Override |
| public int write(final ByteBuffer src) throws IOException { |
| if (src == null) { |
| return 0; |
| } |
| assertNotCompleted(); |
| |
| int total = 0; |
| while (src.hasRemaining()) { |
| int chunk = src.remaining(); |
| int avail; |
| avail = this.buffer.capacity(); |
| |
| // subtract the length of the longest chunk header |
| // 12345678\r\n |
| // <chunk-data>\r\n |
| avail -= 12; |
| if (avail > 0) { |
| if (avail < chunk) { |
| // write no more than 'avail' bytes |
| chunk = avail; |
| this.lineBuffer.clear(); |
| this.lineBuffer.append(Integer.toHexString(chunk)); |
| this.buffer.writeLine(this.lineBuffer); |
| final int oldlimit = src.limit(); |
| src.limit(src.position() + chunk); |
| this.buffer.write(src); |
| src.limit(oldlimit); |
| } else { |
| // write all |
| this.lineBuffer.clear(); |
| this.lineBuffer.append(Integer.toHexString(chunk)); |
| this.buffer.writeLine(this.lineBuffer); |
| this.buffer.write(src); |
| } |
| this.lineBuffer.clear(); |
| this.buffer.writeLine(this.lineBuffer); |
| total += chunk; |
| } |
| if (this.buffer.length() >= this.chunkSizeHint || src.hasRemaining()) { |
| final int bytesWritten = flushToChannel(); |
| if (bytesWritten == 0) { |
| break; |
| } |
| } |
| } |
| return total; |
| } |
| |
| @Override |
| public void complete(final List<? extends Header> trailers) throws IOException { |
| assertNotCompleted(); |
| this.lineBuffer.clear(); |
| this.lineBuffer.append("0"); |
| this.buffer.writeLine(this.lineBuffer); |
| writeTrailers(trailers); |
| this.lineBuffer.clear(); |
| this.buffer.writeLine(this.lineBuffer); |
| super.complete(trailers); |
| } |
| |
| private void writeTrailers(final List<? extends Header> trailers) throws IOException { |
| if (trailers != null) { |
| for (int i = 0; i < trailers.size(); i++) { |
| final Header header = trailers.get(i); |
| if (header instanceof FormattedHeader) { |
| final CharArrayBuffer chbuffer = ((FormattedHeader) header).getBuffer(); |
| buffer.writeLine(chbuffer); |
| } else { |
| this.lineBuffer.clear(); |
| BasicLineFormatter.INSTANCE.formatHeader(this.lineBuffer, header); |
| buffer.writeLine(this.lineBuffer); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append("[chunk-coded; completed: "); |
| sb.append(isCompleted()); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| } |