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Friday, 27 September 2013
Sunday, 15 September 2013
2009
Block Formats
==========================================================================
Marker block ( MARK_HEAD )
HEAD_CRC Always 0x6152
2 bytes
HEAD_TYPE Header type: 0x72
1 byte
HEAD_FLAGS Always 0x1a21
2 bytes
HEAD_SIZE Block size = 0x0007
2 bytes
The marker block is actually considered as a fixed byte
sequence: 0x52 0x61 0x72 0x21 0x1a 0x07 0x00
Archive header ( MAIN_HEAD )
HEAD_CRC CRC of fields HEAD_TYPE to RESERVED2
2 bytes
HEAD_TYPE Header type: 0x73
1 byte
HEAD_FLAGS Bit flags:
2 bytes
0x0001 - Volume attribute (archive volume)
0x0002 - Archive comment present
RAR 3.x uses the separate comment block
and does not set this flag.
0x0004 - Archive lock attribute
0x0008 - Solid attribute (solid archive)
0x0010 - New volume naming scheme ('volname.partN.rar')
0x0020 - Authenticity information present
RAR 3.x does not set this flag.
0x0040 - Recovery record present
0x0080 - Block headers are encrypted
0x0100 - First volume (set only by RAR 3.0 and later)
other bits in HEAD_FLAGS are reserved for
internal use
HEAD_SIZE Archive header total size including archive comments
2 bytes
RESERVED1 Reserved
2 bytes
RESERVED2 Reserved
4 bytes
File header (File in archive)
HEAD_CRC CRC of fields from HEAD_TYPE to FILEATTR
2 bytes and file name
HEAD_TYPE Header type: 0x74
1 byte
HEAD_FLAGS Bit flags:
2 bytes
==========================================================================
Marker block ( MARK_HEAD )
HEAD_CRC Always 0x6152
2 bytes
HEAD_TYPE Header type: 0x72
1 byte
HEAD_FLAGS Always 0x1a21
2 bytes
HEAD_SIZE Block size = 0x0007
2 bytes
The marker block is actually considered as a fixed byte
sequence: 0x52 0x61 0x72 0x21 0x1a 0x07 0x00
Archive header ( MAIN_HEAD )
HEAD_CRC CRC of fields HEAD_TYPE to RESERVED2
2 bytes
HEAD_TYPE Header type: 0x73
1 byte
HEAD_FLAGS Bit flags:
2 bytes
0x0001 - Volume attribute (archive volume)
0x0002 - Archive comment present
RAR 3.x uses the separate comment block
and does not set this flag.
0x0004 - Archive lock attribute
0x0008 - Solid attribute (solid archive)
0x0010 - New volume naming scheme ('volname.partN.rar')
0x0020 - Authenticity information present
RAR 3.x does not set this flag.
0x0040 - Recovery record present
0x0080 - Block headers are encrypted
0x0100 - First volume (set only by RAR 3.0 and later)
other bits in HEAD_FLAGS are reserved for
internal use
HEAD_SIZE Archive header total size including archive comments
2 bytes
RESERVED1 Reserved
2 bytes
RESERVED2 Reserved
4 bytes
File header (File in archive)
HEAD_CRC CRC of fields from HEAD_TYPE to FILEATTR
2 bytes and file name
HEAD_TYPE Header type: 0x74
1 byte
HEAD_FLAGS Bit flags:
2 bytes
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