NAME
File::BSED - Search/Replace in Binary Files.
VERSION
This document describes File::BSED version 0.66
SYNOPSIS
use File::BSED qw(binary_search_replace binary_file_matches);
# search/replace
my $matches = binary_search_replace({
search => 'ff3cea3f0013',
replace => 'b801000000c3',
infile => '/bin/ls',
outfile => '/tmp/ls.patched'
});
if ($matches == -1) {
my $error_string = File::BSED->errtostr();
die "Error: $error_string\n";
}
print "Replaced $matches time(s)\n";
# search
my $matches = binary_file_matches('ff3cea3f0013', '/bin/ls');
print "Matched $matches time(s)\n";
# replace 'gnu' to 'bsd'
my $hex_gnu = File::BSED::string_to_hexstring('gnu');
my $hex_bsd = File::BSED::string_to_hexstring('bsd');
my $matches = binary_search_replace({
search => $hex_gnu,
replace => $hex_bsd,
infile => '/bin/ls',
outfile => 'ls.bsd',
});
# [...]
DESCRIPTION
This is a perl-binding to "libgbsed", a binary stream editor.
"gbsed" lets you search and replace binary data in binary files by using
hex values in text strings as search patterns. You can also use wildcard
matches with "??", which will match any wide byte.
These are all valid search strings:
search => "0xffc300193ab2f63a";
search => "0xff??00??3ab2f??a";
search => "FF??00??3AB2F??A";
while these are not:
search => "the quick brown fox"; # only hex, no text. you would have to
# convert the text to hex first.
search => "0xff?c33ab3?accc"; # no nybbles only wide bytes. (?? not ?).
SUBROUTINES/METHODS
CLASS METHODS
"binary_search_replace(\%arguments)"
Search and replace in a binary file. Valid arguments are:
search
The pattern to search for. Must be a string with hex digits.
replace
What to replace with. Must be a string with hex digits. (Probably a
very good idea that it is the same length as the search pattern).
infile
The filename of the file to search in.
outfile
The filename of the file to save changes to.
minmatch
Need at least $minmatch matches before any work.
maxmatch
Stop after $maxmatch matches.
"bsed" returns the number of times the search string was found in the
file, or -1 if an error occurred. When an error occurs the error number
can be found with "errno" and you can get a description of the error
with "errtostr".
Example:
my $number_of_matches = binary_search_replace({
search => '0xff',
replace => '0x00',
infile => '/bin/ls',
outfile => '/bin/ls.patched',
});
if ($number_of_matches = -1) {
die sprintf("ERROR: %s\n", File::BSED->errtostr());
}
print "Replaced $number_of_matches time(s).\n";
"gbsed(\%arguments)"
Alias to "binary_search_replace" for backward compatibility.
"binary_file_matches($search_pattern, $input_file)"
Return the number of times $search_pattern is found in binary file.
Search pattern must be a string of hex digits.
Example:
my $number_of_matches = binary_file_matches('0xfeedface', '/bin/ls');
print "Matched $number_of_matches time(s)\n";
"string_to_hexstring($text)"
Convert text to a string of ASCII hex values.
ERROR HANDLING
"errtostr"
This function returns a string describing what happened. if an error has
occurred with either "binary_search_matches" or "binary_file_matches"
(they return -1 on error).
"errno"
This function returns the error number if an error has occurred with
either "binary_search_replace" or "binary_file_matches" (they return -1
on error).
Use "errtostr" instead.
WARNINGS
"warnings()"
Returns an array ref to any warnings raised.
Example:
my @warnings = @{ File::BSED::warnings() };
for my $warning (@warnings) {
warn "Warning: $warning\n";
}
DIAGNOSTICS
CONFIGURATION AND ENVIRONMENT
This module requires no configuration file or environment variables.
DEPENDENCIES
* A working C compiler.
INCOMPATIBILITIES
None known.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests to
"bug-file-bsed@rt.cpan.org", or through the web interface at
<http://rt.cpan.org>.
SEE ALSO
* plbsed
AUTHOR
by Ask Solem, "ask@0x61736b.net".
ACKNOWLEDGEMENTS
Dave Dykstra "dwdbsed@drdykstra.us". for "bsed" the original program,
*0xfeedface* for the wildcards patch.
LICENSE AND COPYRIGHT
Copyright (c), 2007 Ask Solem "ask@0x61736b.net".
SEE
perlartistic perlgpl
All rights reserved.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either Perl version 5.8.6 or, at
your option, any later version of Perl 5 you may have available.
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BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
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NECESSARY SERVICING, REPAIR, OR CORRECTION.
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