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Top Forums Shell Programming and Scripting Find and increment value in string of hex Post 303009739 by securegooner on Tuesday 19th of December 2017 09:58:53 AM
Old 12-19-2017
Sorry first poster trying to explain... Smilie

So I have a file containing one long line of hex (converted from BER ASN.1), i.e.

Code:
30820170a15c80070400020205010d8119877532221275e5727de311be4e938334297fb650ff00ff00ff82024e4ca31fa01580083033313035343030a2098107831341090000018102689582024e4c840100a70b80045940f1598103058390880102a282010ea4820...

I want to find all occurrences between the hex pairs 84 and a7 and replace these values by (length)(value) where length = 02 if value > 127dec, otherwise 01. And value should be incremented (beginning at 0) for each occurrence.

value will be equal to 2 bytes (4 places) where length = 02.
 

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asn1_get_length_ber(3)						     libtasn1						    asn1_get_length_ber(3)

NAME
asn1_get_length_ber - API function SYNOPSIS
#include <libtasn1.h> signed long asn1_get_length_ber(const unsigned char * ber, int ber_len, int * len); ARGUMENTS
const unsigned char * ber BER data to decode. int ber_len Length of BER data to decode. int * len Output variable containing the length of the BER length field. DESCRIPTION
Extract a length field from BER data. The difference to asn1_get_length_der() is that this function will return a length even if the value has indefinite encoding. RETURN VALUE
Return the decoded length value, or negative value when the value was too big. SINCE
2.0 COPYRIGHT
Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. SEE ALSO
The full documentation for libtasn1 is maintained as a Texinfo manual. If the info and libtasn1 programs are properly installed at your site, the command info libtasn1 should give you access to the complete manual. libtasn1 2.2 asn1_get_length_ber(3)
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