Offset Size Name Description
------ -------- ------------ -------------------------------------------------------------
0x00 2 HeadCRC CRC of block header
0x02 1 HeaderType Block type:
RarBlock Marker (0x72)
ArcHeader (0x73)
FileHeader(0x74)
OldStyle Comment Header(0x75)
OldStyle Authenticity Information (0x76)
OldStyle SubBlock (0x77)
OldStyle Recovery Record (0x78)
OldStyle Authenticity Information (0x79)
SubBlock (0x7a)
EndBlock (0x7b)
0x03 2 Flags Block flags:
SKIP_IF_UNKNOWN (0x4000)
LONG_BLOCK (0x8000)
0x05 2 HeadSize Header size