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parsing of 8bit binary data bitwise Posted by dharshana.ve (dharshana.ve), 9 November 2006 Hi all,I wanted to know how to parse a 8bit binary data bitwise? I have my input in hex and i convert it into binary form using the following logic: %h2b = (0 => "0000", 1 => "0001", 2 => "0010", 3 => "0011", 4 => "0100", 5 => "0101", 6 => "0110", 7 => "0111", 8 => "1000", 9 => "1001", a => "1010", b => "1011", c => "1100", d => "1101", e => "1110", f => "1111", ); $hex = "43"; ($binary = $hex) =~ s/(.)/$h2b{lc $1}/g; print $binary, "\n"; Now the output for the above prg is 01000011 Now i have to display this binary data as shown below: 0=> abc 100=> def 0011=> lmn How to go about this? Posted by admin (Graham Ellis), 9 November 2006 Hi - does this question replace the one you posted an hour or two back, or is it a different one? Does our binary data handler help answer both or either? ... that demostrates conversions to and from binary (0 and 1) strings which I think is what you're lookig at.Posted by dharshana.ve (dharshana.ve), 9 November 2006 The previous problem i solved using the code which i have specified in the second mail. This problem is a fresh one. Let me explain it better I get data in hex bytes from a log file. I have to parse them or analyze them according to some predefined rules or values. For eg: a hex byte of 0xa4 is converted to binary as 10100100 Now, i have a file in which the values are predefined. It looks like 0xa4 => 10100100 in that MSB 1 stands for some abc then the following bits 01 stands for cdf then the remaining bits 00100 stands for xyz (0/1) | 2 bits | 5 bits abc | System name | Other details System name Other Details 00 ujj 00000 01 cdf 00001 etc.... 10 bbg 11 gtt In the above example, the text is just an eg and not the actual text. I get those 8 bits as a whole as hex byte which i need to parse and diplay them bitwise. Hope this explains better. Posted by admin (Graham Ellis), 9 November 2006 Is this the conversion you need:Code:
Posted by dharshana.ve (dharshana.ve), 10 November 2006 Thanks for your response. I sincerely appreciate it.I got the conversion what i needed.... It is something like the following. use strict; use warnings; my $hex = "ab"; my $binary = unpack 'B*', pack 'H*', $hex; print "$binary\n\n"; my @fields = unpack 'A1A3A4', $binary; my $i; printf "%-4s => %s\n", $fields[$i++], $_ foreach qw/abc def lmn/; **OUTPUT** 10101011 1 abc 010 def 1011 lmn Thanks once again Graham!!!! This page is a thread posted to the opentalk forum
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