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Top Forums Programming C program to read a binary file and search for a string? Post 302902012 by drl on Saturday 17th of May 2014 10:56:16 AM
Old 05-17-2014
Hi.

Using the GNU utilities, one could avoid resorting to c:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate searching binary file.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C strings head grep

FILE=${1-$(which cut)}

pl " Input data file $FILE is type $(file $FILE)"

pl " Results, strings -- $(wc -l < $FILE) strings found." 

pl " Results, strings and first 2 occurrences:"
strings $FILE |
head -2 

pl " Results, strings and grep searching for \"bucket\""
strings $FILE |
grep bucket

pl " Results, grep, (expect only a message):"
grep bucket $FILE

pl " Results, grep, every occurrence:"
grep -a bucket $FILE

pl " Results, grep, only first 2 results:"
grep -a -m 2 bucket $FILE

exit 0

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
strings GNU strings (GNU Binutils for Debian) 2.18.0.20080103
head (GNU coreutils) 6.10
grep GNU grep 2.5.3

-----
 Input data file /usr/bin/cut is type /usr/bin/cut: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped

-----
 Results, strings -- 130 strings found.

-----
 Results, strings and first 2 occurrences:
/lib64/ld-linux-x86-64.so.2
__gmon_start__

-----
 Results, strings and grep searching for "bucket"
# buckets:         %lu
max bucket length: %lu
# buckets used:    %lu (%.2f%%)

-----
 Results, grep, (expect only a message):
Binary file /usr/bin/cut matches

-----
 Results, grep, every occurrence:
# buckets:         %lu
max bucket length: %lu
# buckets used:    %lu (%.2f%%)

-----
 Results, grep, only first 2 results:
# buckets:         %lu
max bucket length: %lu

This uses command cut binary file as the file to be searched.

See man pages for details.

Best wishes ... cheers, drl
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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