  RES SIZE FILE
 512K 512K ddtest

whole file
status: 0
RES SIZE FILE
 0B 512K ddtest

offset: 131072
status: 0
  RES SIZE FILE
 128K 512K ddtest

length: 262144
status: 0
  RES SIZE FILE
 256K 512K ddtest

offset: 131072, length: 262144 fd: 42
status: 0
  RES SIZE FILE
 256K 512K ddtest

