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Full Discussion: Need to convert bytearray into text2pcap format
Top Forums UNIX for Beginners Questions & Answers Need to convert bytearray into text2pcap format Post 303036568 by RudiC on Tuesday 2nd of July 2019 04:11:33 PM
Old 07-02-2019
Quote:
Originally Posted by sand1234
...

%04x pads the first element with 0s to make up 4 digits in hex,
Yes

Quote:
and is assigned to variable counter.
No. It's used as printf's "format string" to be used for variable counter


Quote:
After this, we print the rest of the line as a string.
YES, be aware of the strike through.

[QUOTE]However I cannot understand why we need counter+=NF in this case, as NF should be 16. Can you please explain this logic? [QUOTE]
The counter in fact is a pointer into the file, starting at the zeroth byte, then at the 16th, etc. Thus adding the line length (better: line's byte count) keeps the pointer pointing to the correct file position.

Quote:
Can we use something else to accomplish this (i.e for loop).
What?
This User Gave Thanks to RudiC For This Post:
sand1234
 

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LEARN ABOUT FREEBSD

ppmtopgm

ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and  pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                                   10 April 2000                                                       ppmtopgm(1)
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