reserveAndWriteUtf8Seq() — netty Function Reference

Source Code

buffer/src/main/java/io/netty/buffer/ByteBufUtil.java lines 881–901

    private static int reserveAndWriteUtf8Seq(ByteBuf buf, CharSequence seq, int start, int end, int reserveBytes) {
        for (;;) {
            if (buf instanceof WrappedCompositeByteBuf) {
                // WrappedCompositeByteBuf is a sub-class of AbstractByteBuf so it needs special handling.
                buf = buf.unwrap();
            } else if (buf instanceof AbstractByteBuf) {
                AbstractByteBuf byteBuf = (AbstractByteBuf) buf;
                byteBuf.ensureWritable0(reserveBytes);
                int written = writeUtf8(byteBuf, byteBuf.writerIndex, reserveBytes, seq, start, end);
                byteBuf.writerIndex += written;
                return written;
            } else if (buf instanceof WrappedByteBuf) {
                // Unwrap as the wrapped buffer may be an AbstractByteBuf and so we can use fast-path.
                buf = buf.unwrap();
            } else {
                byte[] bytes = seq.subSequence(start, end).toString().getBytes(CharsetUtil.UTF_8);
                buf.writeBytes(bytes);
                return bytes.length;
            }
        }
    }