H-RAR Recovery v1.4 (压缩文档恢复修复工具 支持碎片)
这个是企业版 支持碎片支持修复 扫描速度慢
这个是个人版 不支持碎片 修复 扫描速度快
参考资料
RAR file format
RAR version 3.93 – Technical information
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
THE ARCHIVE FORMAT DESCRIBED BELOW IS ONLY VALID FOR VERSIONS SINCE 1.50
==========================================================================
RAR archive file format
==========================================================================
Archive file consists of variable length blocks. The order of these
blocks may vary, but the first block must be a marker block followed by
an archive header block.
Each block begins with the following fields:
HEAD_CRC 2 bytes CRC of total block or block part
HEAD_TYPE 1 byte Block type
HEAD_FLAGS 2 bytes Block flags
HEAD_SIZE 2 bytes Block size
ADD_SIZE 4 bytes Optional field – added block size
Field ADD_SIZE present only if (HEAD_FLAGS & 0×8000) != 0
Total block size is HEAD_SIZE if (HEAD_FLAGS & 0×8000) == 0
and HEAD_SIZE+ADD_SIZE if the field ADD_SIZE is present – when
(HEAD_FLAGS & 0×8000) != 0.
In each block the followings bits in HEAD_FLAGS have the same meaning:
0×4000 – if set, older RAR versions will ignore the block
and remove it when the archive is updated.
if clear, the block is copied to the new archive
file when the archive is updated;
0×8000 – if set, ADD_SIZE field is present and the full block
size is HEAD_SIZE+ADD_SIZE.
Declared block types:
HEAD_TYPE=0×72 marker block
HEAD_TYPE=0×73 archive header
HEAD_TYPE=0×74 file header
HEAD_TYPE=0×75 old style comment header
HEAD_TYPE=0×76 old style authenticity information
HEAD_TYPE=0×77 old style subblock
HEAD_TYPE=0×78 old style recovery record
HEAD_TYPE=0×79 old style authenticity information
HEAD_TYPE=0x7a subblock
Comment block is actually used only within other blocks and doesn’t
exist separately.
Archive processing is made in the following manner:
1. Read and check marker block
2. Read archive header
3. Read or skip HEAD_SIZE-sizeof(MAIN_HEAD) bytes
4. If end of archive encountered then terminate archive processing,
else read 7 bytes into fields HEAD_CRC, HEAD_TYPE, HEAD_FLAGS,
HEAD_SIZE.
5. Check HEAD_TYPE.
if HEAD_TYPE==0×74
read file header ( first 7 bytes already read )
read or skip HEAD_SIZE-sizeof(FILE_HEAD) bytes
if (HEAD_FLAGS & 0×100)
read or skip HIGH_PACK_SIZE*0×100000000+PACK_SIZE bytes
else
read or skip PACK_SIZE bytes
else
read corresponding HEAD_TYPE block:
read HEAD_SIZE-7 bytes
if (HEAD_FLAGS & 0×8000)
read ADD_SIZE bytes
6. go to 4.
==========================================================================
Block Formats
==========================================================================
Marker block ( MARK_HEAD )
HEAD_CRC Always 0×6152
2 bytes
HEAD_TYPE Header type: 0×72
1 byte
HEAD_FLAGS Always 0x1a21
2 bytes
HEAD_SIZE Block size = 0×0007
2 bytes
The marker block is actually considered as a fixed byte
sequence: 0×52 0×61 0×72 0×21 0x1a 0×07 0×00
Archive header ( MAIN_HEAD )
HEAD_CRC CRC of fields HEAD_TYPE to RESERVED2
2 bytes
HEAD_TYPE Header type: 0×73
1 byte
HEAD_FLAGS Bit flags:
2 bytes
0×0001– Volume attribute (archive volume)
0×0002– Archive comment present
RAR 3.x uses the separate comment block
and does not set this flag.
0×0004– Archive lock attribute
0×0008– Solid attribute (solid archive)
0×0010– New volume naming scheme (‘volname.partN.rar’)
0×0020– Authenticity information present
RAR 3.x does not set this flag.
0×0040– Recovery record present
0×0080– Block headers are encrypted
0×0100– 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: 0×74
1 byte
HEAD_FLAGS Bit flags:
2 bytes
0×01 – file continued from previous volume
0×02 – file continued in next volume
0×04 – file encrypted with password
0×08 – file comment present
RAR 3.x uses the separate comment block
and does not set this flag.
0×10 – information from previous files is used (solid flag)
(for RAR 2.0 and later)
bits 7 6 5 (for RAR 2.0 and later)
0 0 0 – dictionary size 64 KB
0 0 1 – dictionary size128 KB
0 1 0 – dictionary size256 KB
0 1 1 – dictionary size512 KB
1 0 0 – dictionary size 1024 KB
1 0 1 – dictionary size 2048 KB
1 1 0 – dictionary size 4096 KB
1 1 1 – file is directory
0×100 – HIGH_PACK_SIZE and HIGH_UNP_SIZE fields
are present. These fields are used to archive
only very large files (larger than 2Gb),
for smaller files these fields are absent.
0×200 – FILE_NAME contains both usual and encoded
Unicode name separated by zero. In this case
NAME_SIZE field is equal to the length
of usual name plus encoded Unicode name plus 1.
If this flag is present, but FILE_NAME does not
contain zero bytes, it means that file name
is encoded using UTF-8.
0×400 – the header contains additional 8 bytes
after the file name, which are required to
increase encryption security (so called ‘salt’).
0×800 – Version flag. It is an old file version,
a version number is appended to file name as ‘;n’.
0×1000 – Extended time field present.
0×8000 – this bit always is set, so the complete
block size is HEAD_SIZE + PACK_SIZE
(and plus HIGH_PACK_SIZE, if bit 0×100 is set)
HEAD_SIZE File header full size including file name and comments
2 bytes
PACK_SIZE Compressed file size
4 bytes
UNP_SIZE Uncompressed file size
4 bytes
HOST_OS Operating system used for archiving
1 byte 0 – MS DOS
1 – OS/2
2 – Win32
3 – Unix
4 – Mac OS
5 – BeOS
FILE_CRC File CRC
4 bytes
FTIME Date and time in standard MS DOS format
4 bytes
UNP_VER RAR version needed to extract file
1 byte
Version number is encoded as
10 * Major version + minor version.
METHOD Packing method
1 byte
0×30 – storing
0×31 – fastest compression
0×32 – fast compression
0×33 – normal compression
0×34 – good compression
0×35 – best compression
NAME_SIZE File name size
2 bytes
ATTR File attributes
4 bytes
HIGH_PACK_SIZEHigh 4 bytes of 64 bit value of compressed file size.
4 bytes Optional value, presents only if bit 0×100 in HEAD_FLAGS
is set.
HIGH_UNP_SIZE High 4 bytes of 64 bit value of uncompressed file size.
4 bytes Optional value, presents only if bit 0×100 in HEAD_FLAGS
is set.
FILE_NAME File name – string of NAME_SIZE bytes size
SALT present if (HEAD_FLAGS & 0×400) != 0
8 bytes
EXT_TIME present if (HEAD_FLAGS & 0×1000) != 0
variable size
other new fields may appear here.
==========================================================================
Application notes
==========================================================================
1. To process an SFX archive you need to skip the SFX module searching
for the marker block in the archive. There is no marker block sequence (0×52
0×61 0×72 0×21 0x1a 0×07 0×00) in the SFX module itself.
2. The CRC is calculated using the standard polynomial 0xEDB88320. In
case the size of the CRC is less than 4 bytes, only the low order bytes
are used.
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