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Top Forums Shell Programming and Scripting Extract sequences of bytes from binary for differents blocks Post 302843787 by Ophiuchus on Thursday 15th of August 2013 05:49:25 AM
Old 08-15-2013
Hello ahamed,

The number of bytes are not constant between the start (0x32) and end (0xff 0x33)

The requested data is only inside each block:

I'm interested in:
1- The sequence in color inmediately after the beginning of each block, I mean after each 0x32 marked in red in image attached. These sequences always happens only once in each block.

2- Some of the sequences after the FF 34 in each block, these sequences not always happens but if happens only do once in each block. For example, in the sample file, the sequences after FF 34 only appear in block #2.

But maybe for now you can help with the sequences of item "1" and after that
I'll try to replicate the logic you use for sequences of item "2" or ask in order to be able to complete the 2nd item.

Thanks in advance for any help.

Regards
Extract sequences of bytes from binary for differents blocks-binary-sequencesjpg
 

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Pod::Abstract::BuildNode(3pm)				User Contributed Perl Documentation			     Pod::Abstract::BuildNode(3pm)

NAME
Pod::Abstract::BuildNode - Build new nodes for use in Pod::Abstract. SYNOPSIS
use Pod::Abstract::BuildNode qw(node nodes); # shorthand my $root_doc = node->root; for(my $i = 1; $i < 10; $i ++) { $root_doc->push(node->head1("Heading number $i")); } print $root_doc->pod; DESCRIPTION
For building a new Pod::Abstract document, or adding nodes to an existing one. This provides easy methods to generate correctly set nodes for most common Pod::Abstract elements. NOTES
Pod::Abstract::BuildNode can export two functions, "node" and "nodes". These are constant functions to provide a shorthand so instead of writing: use Pod::Abstract::BuildNode; # ... my @nodes = Pod::Abstract::BuildNode->from_pod( $pod ); You can instead write: use Pod::Abstract::BuildNode qw(node nodes); # ... my @nodes = nodes->from_pod($pod); Which is more readable, and less typing. "node" and "nodes" are both synonyms of "Pod::Abstract::BuildNode". This shorthand form is shown in all the method examples below. All methods operate on the class. METHODS
from_pod my @nodes = nodes->from_pod($pod_text); Given some literal Pod text, generate a full subtree of nodes. The returned array is all of the top level nodes. The full document tree will be populated under the returned nodes. root my $root = node->root; Generate a root node. A root node generates no output, and is used to hold a document tree. Use this to make a new document. begin my $begin_block = node->begin($command); Generates a begin/end block. Nodes nested inside the begin node will appear between the begin/end. Note that there is no corresponding "end" method - the end command belongs to it's corresponding begin. for my $for = node->for('overlay from <class>'); Create a =for node. The argument is the literal body of the for node, no parsing will be performed. paragraph my $para = node->paragraph('Pod text'); Generates a Pod paragraph, possibly containing interior sequences. The argument will be parsed as Pod, and will generate text and sequence nodes inside the paragraph. verbatim my $v = node->verbatim($text); Add the given text as a verbatim node to the document. All lines in the fiven $text will be indented by one space to ensure they are treated as verbatim. heading my $head2 = node->heading(2, $heading); Generate a heading node at the given level. Nodes that "belong" in the heading's section should be nested in the heading node. The $heading text will be parsed for interior sequences. head1 node->head1($heading); head2 node->head2($heading); head3 node->head3($heading); head4 node->head4($heading); over my $list = node->over([$num]); Generates an over/back block, to contain list items. The optional parameter $num specifies the number of spaces to indent by. Note that the back node is part of the over, there is no separate back method. item my $item = node->item('*'); Generates an item with the specified label. To fill in the text of the item, nest paragraphs into the item. Items should be contained in over nodes. text my $text = node->text('Literal text'); Generates a literal text node. You generally do not want this, you probably want a paragraph. Use this if you want to, for example, append a word at the end of a paragraph. pod my $n = node->pod; Generates an "=pod" command. Can be useful to force pod mode at the end of cut nodes. Do not confuse with "from_pod"! my $cut = node->cut; Generates an explicit "=cut" command. AUTHOR
Ben Lilburne <bnej@mac.com> COPYRIGHT AND LICENSE
Copyright (C) 2009 Ben Lilburne This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-01-03 Pod::Abstract::BuildNode(3pm)
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