  RES SIZE FILE
  32K  32K ddtest

whole file
status: 0
RES SIZE FILE
 0B  32K ddtest

offset: 8192
status: 0
RES SIZE FILE
 8K  32K ddtest

length: 16384
status: 0
  RES SIZE FILE
  16K  32K ddtest

offset: 8192, length: 16384 fd: 42
status: 0
  RES SIZE FILE
  16K  32K ddtest

