com.fireflysource.net.websocket.common.extension.compress.DeflateFrameExtension Maven / Gradle / Ivy

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package com.fireflysource.net.websocket.common.extension.compress;

import com.fireflysource.net.websocket.common.exception.BadPayloadException;
import com.fireflysource.net.websocket.common.frame.Frame;

import java.util.zip.DataFormatException;

/**
 * Implementation of the
 * deflate-frame
 * extension seen out in the wild.
 */
public class DeflateFrameExtension extends CompressExtension {
    @Override
    public String getName() {
        return "deflate-frame";
    }

    @Override
    int getRsvUseMode() {
        return RSV_USE_ALWAYS;
    }

    @Override
    int getTailDropMode() {
        return TAIL_DROP_ALWAYS;
    }

    @Override
    public void incomingFrame(Frame frame) {
        // Incoming frames are always non concurrent because
        // they are read and parsed with a single thread, and
        // therefore there is no need for synchronization.

        if (frame.getType().isControl() || !frame.isRsv1() || !frame.hasPayload()) {
            nextIncomingFrame(frame);
            return;
        }

        try {
            ByteAccumulator accumulator = newByteAccumulator();
            decompress(accumulator, frame.getPayload());
            decompress(accumulator, TAIL_BYTES_BUF.slice());
            forwardIncoming(frame, accumulator);
        } catch (DataFormatException e) {
            throw new BadPayloadException(e);
        }
    }

}