Reads a tx buf at the specified offset
Buffer object from where the blockExtend will be read
Number of bytes to skip before starting to read
Size of the serialized data
the bytes size of a serialized blockExtend
Writes data to buf at the specified offset
BlockExtend data to be written to buffer
Buffer object where the blockExtend will be written
Number of bytes to skip before starting to write.
Offset plus the number of bytes that has been written
Class to handle the protocol BlockExtend type