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 DEBIAN

buffer_get

buffer_get(3)						     Library Functions Manual						     buffer_get(3)

NAME

       buffer_get - read binary data from buffer

SYNTAX

       #include <buffer.h>

       ssize_t buffer_get(buffer* b,char* x,size_t len);

DESCRIPTION

       Normally buffer_get copies data to x[0], x[1], ..., x[len-1] from the beginning of a string stored in preallocated space; removes these len
       bytes from the string; and returns len.

       If, however, the string has fewer than len (but more than 0) bytes, buffer_get copies only that many bytes, and returns that number.

       If the string is empty, buffer_get first uses a read operation to feed data into the string. The read operation may indicate end of  input,
       in which case buffer_get returns 0; or a read error, in which case buffer_get returns -1, setting errno approporiately.

       The preallocated space and the read operation are specified by b. You must initialize b using buffer_init before calling buffer_get (or use
       the pre-initialized buffer_0).

SEE ALSO

       buffer_init(3), buffer_feed(3), buffer_peek(3), buffer_seek(3), buffer(3)

																     buffer_get(3)