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Re: Locating sequence of bytes within binary file [message #71408 is a reply to message #71334]

Wed, 16 June 2010 10:46

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

It is not the prettiest solution, but you could turn your byte array
into an array of strings of the byte values. That is, a print-like
conversion, instead of byte to string conversion. Something like

scontent=strjoin(string(int(fcontent),format='(I3.3)')))

Then search for a similarly stringified version of your byte pattern

spattern=strjoin(string(int(sequence_searched),format='(I3.3 )')))

if stregex(scontent,spattern,/boolean) then ...

I did not test it, but I think it should work, at the cost of using 3
bytes for each byte in the original content (3 ASCII digits for each
value). This also avoids the other problem with your initial solution,
which would happen if the string from your byte pattern happened to
have any special characters, which would be interpreted non-literally
in a regex.

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[Message index]

		Locating sequence of bytes within binary file By: medd on Tue, 15 June 2010 04:30
		Re: Locating sequence of bytes within binary file By: JDS on Thu, 17 June 2010 10:48
		Re: Locating sequence of bytes within binary file By: Axel Martínez on Fri, 18 June 2010 09:47
		Re: Locating sequence of bytes within binary file By: medd on Thu, 17 June 2010 01:03
		Re: Locating sequence of bytes within binary file By: penteado on Wed, 16 June 2010 10:46
		Re: Locating sequence of bytes within binary file By: David Fanning on Fri, 18 June 2010 15:21
		Re: Locating sequence of bytes within binary file By: kamal on Thu, 24 June 2010 01:42
		Re: Locating sequence of bytes within binary file By: JDS on Fri, 18 June 2010 15:12

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