/*
* Copyright (c) 2012-2013 Spotify AB
*
* Licensed 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.
*/
package com.spotify.netty4.handler.codec.zmtp;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import static java.lang.Math.min;
/**
* Netty ZMTP decoder.
*/
class ZMTPFramingDecoder extends ByteToMessageDecoder {
private final ZMTPDecoder decoder;
private final ZMTPWireFormat.Header header;
private long remaining;
private boolean headerParsed;
public ZMTPFramingDecoder(final ZMTPWireFormat wireFormat, final ZMTPDecoder decoder) {
this.header = wireFormat.header();
this.decoder = decoder;
}
@Override
protected void handlerRemoved0(final ChannelHandlerContext ctx) {
decoder.close();
}
@Override
protected void decode(final ChannelHandlerContext ctx, final ByteBuf in, final List<Object> out)
throws ZMTPParsingException {
while (in.isReadable()) {
if (!headerParsed) {
final int mark = in.readerIndex();
headerParsed = header.read(in);
if (!headerParsed) {
// Wait for more data
in.readerIndex(mark);
return;
}
decoder.header(ctx, header.length(), header.more(), out);
remaining = header.length();
}
final int writerMark = in.writerIndex();
final int n = (int) min(remaining, in.readableBytes());
final int readerMark = in.readerIndex();
in.writerIndex(readerMark + n);
decoder.content(ctx, in, out);
in.writerIndex(writerMark);
final int read = in.readerIndex() - readerMark;
remaining -= read;
if (remaining > 0) {
// Wait for more data
return;
}
if (!header.more()) {
decoder.finish(ctx, out);
}
headerParsed = false;
}
}
}