Re: Handling Hex data with Dynamic unpack

This is how I would start, but I'd need more complete spec

#!/usr/bin/perl --
use strict; use warnings;
use Data::Dump;

my $rawAsHex = q'0001000000004f914f1c0b0100425343413030000000050000434
+130303030300000000143413030303134000000024341303030323200000003434130
+3030323400000004434130303032390000000100224e43656c6c30000000020042534
+341303100000005000543413031303031000000064341303130303400000007434130
+31303130000000084341303130313500000009434130313031360000000100224e436
+56c6c30000000030042534341303200000006000a';
my $raw = pack 'H*', $rawAsHex;
my @stack = unpack q{
A2 ### Header Record Id : 1 Byte
A2 ### File Format Version : 1 Byte
A16 ### Timestamp : 8 Bytes
A2 ### No. of BSCs : 1 Byte
   ###     For each BSC ...
A2 ###     BSC Id : 1 Byte
A2 ###     Application Version : 1 Byte
A4 ###     BSC Name : 2 Bytes
A4 ###     Number of Cells : 2 Bytes
   ###         For each Cell ...
A4 ###         Cell Pointer : 2 Bytes
A18 ###         Cell Name : 9 Bytes
A4 ###         Number of Neighbour Cells : 2 Bytes
   ###             For each Neighbour Cell to this BSC ...
A4 ###             Cell Pointer : 2 Bytes
A18 ###             Cell Name : 9 Bytes
}, $rawAsHex;

my $id      = unpack 'C*', pack 'H*', $stack[0];
my $version = unpack 'C*', pack 'H*', $stack[1];
my $time    = unpack 'H*', pack 'H*', $stack[2]; ## WHAT?!

dd [ $id, $version, $time , \@stack ];
__END__
[
  0,
  1,
  "000000004f914f1c",
  [
    "00",
    "01",
    "000000004f914f1c",
    "0b",
    "01",
    "00",
    4253,
    4341,
    3030,
    "000000050000434130",
    3030,
    3030,
    "000000014341303030",
  ],
]
[download]

Comment on Re: Handling Hex data with Dynamic unpack Download Code

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Re^2: Handling Hex data with Dynamic unpack by PerlJedi (Novice) on Jul 05, 2012 at 11:17 UTC
Hey Thanks Anonymous Monk ... It certainly is a good starting point. I appretiate your replies :) Thanks and Regards, PerlJedi	[reply]
Re^2: Handling Hex data with Dynamic unpack by PerlJedi (Novice) on Jul 05, 2012 at 11:28 UTC
Some how perl doesn't allow me to unpack like this (look at H2 H2 H16 H2 A2 ...) : my @stack = unpack q{ H2 ### Header Record Id : 1 Byte H2 ### File Format Version : 1 Byte H16 ### Timestamp : 8 Bytes H2 ### No. of BSCs : 1 Byte ### For each BSC ... A2 ### BSC Id : 1 Byte A2 ### Application Version : 1 Byte A4 ### BSC Name : 2 Bytes A4 ### Number of Cells : 2 Bytes ### For each Cell ... A4 ### Cell Pointer : 2 Bytes A18 ### Cell Name : 9 Bytes A4 ### Number of Neighbour Cells : 2 Bytes ### For each Neighbour Cell to this BSC ... A4 ### Cell Pointer : 2 Bytes A18 ### Cell Name : 9 Bytes }, $rawAsHex; [download] Any idea how this could be done? I get a output like this : `[ 48, 48, "3031303030303030", [ 30, 30, "3031303030303030", 30, "04", "f9", "14f1", "c0b0", 1004, "253434130300000000", 5000, "0434", "130303030300000000", ], ]` [download]	[reply] [d/l] [select]
Re^3: Handling Hex data with Dynamic unpack by Anonymous Monk on Jul 05, 2012 at 11:38 UTC
Some how perl doesn't allow me to unpack like this (look at H2 H2 H16 H2 A2 ...) ... Any idea how this could be done? I showed you how. What you're dealing is a text-strings, so if you want bytes, you have to pack them. First pack them to get bytes ( pack 'H' ) then pack them to get what you're really after ( C An unsigned char (octet) value. ) ..... Commands `perl -le " print unpack q{H}, q{Y} " perl -le " print pack q{H}, q{59} " perl -le " print ord q{Y} perl -le " print pack q{H}, q{59} " perl -le " print unpack q{C}, pack q{H}, q{59} "` [download] Session `$ perl -le " print unpack q{H}, q{Y} " 59 $ perl -le " print pack q{H}, q{59} " Y $ perl -le " print ord q{Y} 89 $ perl -le " print pack q{H}, q{59} " Y $ perl -le " print unpack q{C}, pack q{H*}, q{59} " 89` [download] Y encoded as hex is 59 The numeric value ( ord ) of Y is 89 The C An unsigned char (octet) value, 8-bits, 1-byte of Y is 89	[reply] [d/l] [select]
Re^4: Handling Hex data with Dynamic unpack by PerlJedi (Novice) on Jul 05, 2012 at 11:43 UTC
Okie ... will try :) Thanks once again.	[reply]


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