@Override
protected void decode(ChannelHandlerContext ctx, WebSocketFrame msg, List<Object> out) throws Exception {
if (decoder == null) {
if (!(msg instanceof TextWebSocketFrame) && !(msg instanceof BinaryWebSocketFrame)) {
throw new CodecException("unexpected initial frame type: " + msg.getClass().getName());
}
decoder = new EmbeddedChannel(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.NONE));
}
decoder.writeInbound(msg.content().retain());
if (appendFrameTail(msg)) {
decoder.writeInbound(Unpooled.wrappedBuffer(FRAME_TAIL));
}
CompositeByteBuf compositeUncompressedContent = ctx.alloc().compositeBuffer();
for (;;) {
ByteBuf partUncompressedContent = decoder.readInbound();
if (partUncompressedContent == null) {
break;
}
if (!partUncompressedContent.isReadable()) {
partUncompressedContent.release();
continue;
}
compositeUncompressedContent.addComponent(partUncompressedContent);
compositeUncompressedContent.writerIndex(compositeUncompressedContent.writerIndex() +
partUncompressedContent.readableBytes());
}
if (compositeUncompressedContent.numComponents() <= 0) {
compositeUncompressedContent.release();
throw new CodecException("cannot read uncompressed buffer");
}
if (msg.isFinalFragment() && noContext) {
cleanup();
}
WebSocketFrame outMsg;
if (msg instanceof TextWebSocketFrame) {
outMsg = new TextWebSocketFrame(msg.isFinalFragment(), newRsv(msg), compositeUncompressedContent);
} else if (msg instanceof BinaryWebSocketFrame) {
outMsg = new BinaryWebSocketFrame(msg.isFinalFragment(), newRsv(msg), compositeUncompressedContent);
} else if (msg instanceof ContinuationWebSocketFrame) {
outMsg = new ContinuationWebSocketFrame(msg.isFinalFragment(), newRsv(msg),
compositeUncompressedContent);
} else {
throw new CodecException("unexpected frame type: " + msg.getClass().getName());
}
out.add(outMsg);
}