private synchronized ByteBuf compressHeaderBlock(ByteBuf uncompressed) throws Exception {
if (uncompressed.readableBytes() == 0) {
return Unpooled.EMPTY_BUFFER;
}
ByteBuf compressed = Unpooled.buffer();
synchronized (headerBlockCompressor) {
if (!finished) {
headerBlockCompressor.setInput(uncompressed);
headerBlockCompressor.encode(compressed);
}
}
return compressed;
}
/** Creates a new instance with the specified parameters. */
public SpdyFrameEncoder(int version, int compressionLevel, int windowBits, int memLevel) {
if (version < SpdyConstants.SPDY_MIN_VERSION || version > SpdyConstants.SPDY_MAX_VERSION) {
throw new IllegalArgumentException("unknown version: " + version);
}
this.version = version;
headerBlockCompressor =
SpdyHeaderBlockCompressor.newInstance(version, compressionLevel, windowBits, memLevel);
}