Offset Size Name Description
-------- -------- ------------ ---------------------------------
0x00 2 HeadCRC CRC of block header
0x02 1 HeaderType Block type = 0x7B
0x03 2 Flags Block flags:
EARC_NEXT_VOLUME (0x0001)
EARC_DATACRC (0x0002)
EARC_REVSPACE (0x0004)
EARC_VOLNUMBER (0x0008)
0x05 2 HeadSize Header size
0x07 4 ArcDataCRC CRC32 hash of RAR archive
Optional - only present if EARC_DATACRC flag is set
0x0B 2 VolNumber Volume number
Optional - only present if EARC_VOLNUMBER flag is set
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