how to get data from hex file using SED or AWK based on pattern sign Post: 302563551

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Top Forums Shell Programming and Scripting how to get data from hex file using SED or AWK based on pattern sign Post 302563551 by sameucho on Tuesday 11th of October 2011 01:45:04 PM

10-11-2011

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how to get data from hex file using SED or AWK based on pattern sign

I have a binary (hex) file I need to parse to get some data which are encoded this way:

.* b4 . . . 01 12 .* af .* 83 L1 x1 x2 xL 84 L2 y1 y2 yL

By another words there is a stream of hexadecimal bytes (in my example separated by space for better readability). I need to get value stored in x1-xL bytes (where L1 is number of 'x' data bytes) and value stored in y1-yL (where L2 is number of 'y' data bytes).

Desired data can be identified by this sequence of bytes:
.* b4 . . . 01 12 .* af .* 83
where '.*' means any number of data, '. . .' means 3 bytes, 'B4, 01, 12, af, 83' is unique ordered sequence which identifies 83 L1 x1 - xL 84 L2 y1 - yL data container (the 'y' bytes identificator '84' must follow immediately after x1-xL data).

Yeh! ... somehow complicated to explain, but I hope clear enough. Can anybody help with the script output of which will be 'X' and 'Y' value from the file.

Note: there may be multiple occurence required data in the file with the different values of 'X' and 'Y', but each one occurence of 'X' and 'Y' is preceeded by string identificator .* b4 . . . 01 12 .* af .* 83 as stated above

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LEARN ABOUT ULTRIX

disktab

disktab(5)							File Formats Manual							disktab(5)

Name
       disktab - disk description file

Syntax
       #include <disktab.h>

Description
       The file is a simple data base that describes disk geometries and disk partition characteristics.  The format is patterned after the termi-
       nal data base.  Entries in consist of a number of fields separated by colons (:).  The first entry for each disk gives the names  that  are
       known for the disk, separated by vertical bars (|).  The last name given should be a long name fully identifying the disk.

       The following list indicates the normal values stored for each disk entry:
       Name Type Description
       ns   num  Number of sectors per track
       nt   num  Number of tracks per cylinder
       nc   num  Total number of cylinders on the disk
       ba   num  Block size for partition `a' (bytes)
       bd   num  Block size for partition `d' (bytes)
       be   num  Block size for partition `e' (bytes)
       bf   num  Block size for partition `f' (bytes)
       bg   num  Block size for partition `g' (bytes)
       bh   num  Block size for partition `h' (bytes)
       fa   num  Fragment size for partition `a' (bytes)
       fd   num  Fragment size for partition `d' (bytes)
       fe   num  Fragment size for partition `e' (bytes)
       ff   num  Fragment size for partition `f' (bytes)
       fg   num  Fragment size for partition `g' (bytes)
       fh   num  Fragment size for partition `h' (bytes)
       pa   num  Size of partition `a' in sectors
       pb   num  Size of partition `b' in sectors
       pc   num  Size of partition `c' in sectors
       pd   num  Size of partition `d' in sectors
       pe   num  Size of partition `e' in sectors
       pf   num  Size of partition `f' in sectors
       pg   num  Size of partition `g' in sectors
       ph   num  Size of partition `h' in sectors
       se   num  Sector size in bytes
       ty   str  Type of disk (e.g. removable, winchester)

       The entries can be automatically generated with the program.

Files
See Also
       chpt(8), newfs(8)

																	disktab(5)