Hi Greg,
This list is all but dead – it may be that you and me are the only people
receiving mail from it.
Much better, IMO, to post these types of questions to perlmonks.
Anyway ... this might help:
#################################
use strict;
use warnings;
my $str = "\x1F\x8B\x08";
print "String contains: $str\n";
open WR, '>', 'file.bin' or die $!;
binmode WR;
print WR $str;
close WR or die $!;
undef $/;
open RD, '<', 'file.bin' or die $!;
binmode RD;
my $contents = <RD>;
close RD or die $!;
if($contents =~ /$str/){print "ok 1\n"}
# To safeguard against presence of
# metacharacters in $str:
if($contents =~ /\Q$str\E/){print "ok 2\n"}
######################################
Cheers,
Rob
From: Greg VisionInfosoft
Sent: Saturday, February 15, 2014 9:41 AM
To: Perl-Win32-Users@listserv.ActiveState.com
Subject: trouble doing regex in file containing both ascii and binary content
i cant figure out what im doing wrong here.
i ran wireshark to monitor a small http client/server query/response.
point of exercise is to see exactly what an ajax response looks like (as im
trying to learn ajax).
unfortunately, the ajax response is sent from server in 'gzip' format (not
plain text).
so wireshark shows two standard http headers and at the end of the stream is
the binary 'gzipped' small stream.
ive saved this wireshark tcp 'stream' to a file. viewing the file in hex mode,
i see clearly the first three binary bytes of the gzipped stream are hex1F
hex8B hex08
what i need to do next is save just the binary gzipped stream to a stand alone
file, then see if i can un-gzip it to read the plain text contents.
in theory, a straight forward task.
i write a quick few line perl script, whereby i open the saved wireshark tcp
stream file, set this input file to binary mode (so as to not change any
internal binary byte values), undefine the input line seperator (to upserp the
entire file into memory when read), read the file to upserp its contents into a
var, do a simple pattern match of \x1F\x8B\x08, then save the matched pattern
$& and what follows the match $' to a new file... (right now the script doesnt
actually yet output to a file, it just dumps to screen)
for reasons that elude me, the pattern match fails.
i know the 3 bytes are in the file, yet the pattern match to those 3 bytes
fails.
any ideas?
heres the small script.
open(IN, $ARGV[0]) || die "cant open input file";
binmode(IN);
undef $/;
my $data = <IN>;
if ($data =~ /\x1F\x8B\x08/) {
print "matched: " . $& . $';
} else {
print "no match\n";
}
the contents of the wireshark stream is as follows...
POST /ajax/demo_post.asp HTTP/1.1
Host: www.w3schools.com
Connection: keep-alive
Content-Length: 0
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/32.0.1700.107 Safari/537.36
Origin: http://www.w3schools.com
Accept: */*
Referer: http://www.w3schools.com/ajax/tryajax_post.htm
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Cookie: ASPSESSIONIDAASDBBTC=BFEPJKCDLGDHEEOJIKANOEHP
HTTP/1.1 200 OK
Cache-Control: private,public
Content-Type: text/html
Content-Encoding: gzip
Vary: Accept-Encoding
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
Date: Fri, 14 Feb 2014 21:03:48 GMT
Content-Length: 201
.............`.I.%&/m.{.J.J..t...`.$..@.........iG#).*..eVe]f.@......{....{....;.N'...?\fd.l..J...!....?~|.?"......&.V.6_..U..u...y...t........./_.I.y;.f..wWG.qBo..
..Q.www.....~..h......./......h.c...
note; the binary data at end is obviously not easily discerned here in ascii
mode. when i open this same file in a binary editor the actual binary contents
(displayed in hex) is as follows... (ive inserted an extra space to make the
hex values be easily discerned).
1f 8b 08 00 00 00 00 00 04 00 ed bd 07 60 1c 49 96 25 26 2f 6d ca 7b 7f 4a f5
4a d7 e0 74 a1 08 80 60 13 24 d8 90 40 10 ec c1 88 cd e6 92 ec 1d 69 47 23 29
ab 2a 81 ca 65 56 65 5d 66 16 40 cc ed 9d bc f7 de 7b ef bd f7 de 7b ef bd f7
ba 3b 9d 4e 27 f7 df ff 3f 5c 66 64 01 6c f6 ce 4a da c9 9e 21 80 aa c8 1f 3f
7e 7c 1f 3f 22 1e af 8e de cc 8b 26 9d 56 cb 36 5f b6 e9 55 d6 a4 75 fe 8b d6
79 d3 e6 b3 74 dd 14 cb 8b b4 9d e7 e9 cb 2f 5f bf 49 17 79 3b af 66 e3 c7 77
57 47 bf 71 42 6f be b2 0d b3 f6 51 ba 77 77 77 ff ee de ce ee 7e ba ff 68 e7
de a3 fd 87 e9 cb 2f d0 f4 ff 01 a8 9f 68 15 63 00 00 00
--------------------------------------------------------------------------------
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