dap4/d4core/src/main/java/dap4/core/util/DapUtil.java
static public byte[] extract(ByteBuffer buf)
    {
        int len = buf.limit();
        byte[] bytes = new byte[len];
        buf.rewind();
        buf.get(bytes);
        return bytes;
    }
static public byte[] extract(ByteBuffer buf)
    {
        int len = buf.limit();
        byte[] bytes = new byte[len];
        buf.rewind();
        buf.get(bytes);
        return bytes;
    }
Properly extract the byte contents of a ByteBuffer

@param buf The buffer whose content is to be extracted
as defined by the buffer limit.
@return The byte array contents of the buffer