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C program to read a binary file and search for a string?
Post 302902005 by newbie_01 on Saturday 17th of May 2014 07:27:59 AM
05-17-2014
C program to read a binary file and search for a string?
Hi,
I am not a C programmer. The only C exposure I have is reading and completing the exercises from the C (ANSI C ) Programming Language book
At the moment, I am using the UNIX strings command to extract information for a binary file and grepping for a particular string and the value after it.
While this is quite quick on a 50M file, it takes a while for a 500M file.
Can someone please advise where I can find some examples of reading a binary file that can search for a particular string and then exits when it finds it or maybe one that reads the first few bytes of a binary file where I assume the contents of the information is.
When running strings | grep, I assume it is running the strings on the whole 500M file and then doing a grep. I am hoping to be able to use a C program that will read only the first x bytes or read the binary file and exits once it found the information that it is looking for.
Any guidance much appreciated. Thanks in advance.
I am not a C programmer. The only C exposure I have is reading and completing the exercises from the C (ANSI C ) Programming Language book
At the moment, I am using the UNIX strings command to extract information for a binary file and grepping for a particular string and the value after it.
While this is quite quick on a 50M file, it takes a while for a 500M file.
Can someone please advise where I can find some examples of reading a binary file that can search for a particular string and then exits when it finds it or maybe one that reads the first few bytes of a binary file where I assume the contents of the information is.
When running strings | grep, I assume it is running the strings on the whole 500M file and then doing a grep. I am hoping to be able to use a C program that will read only the first x bytes or read the binary file and exits once it found the information that it is looking for.
Any guidance much appreciated. Thanks in advance.
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LEARN ABOUT OSX
strings
STRINGS(1) General Commands Manual STRINGS(1) NAME
strings - find the printable strings in a object, or other binary, file SYNOPSIS
strings [ - ] [ -a ] [ -o ] [ -t format ] [ -number ] [ -n number ] [--] [file ...] DESCRIPTION
Strings looks for ASCII strings in a binary file or standard input. Strings is useful for identifying random object files and many other things. A string is any sequence of 4 (the default) or more printing characters ending with a newline or a null. Unless the - flag is given, strings looks in all sections of the object files except the (__TEXT,__text) section. If no files are specified standard input is read. The file arguments may be of the form libx.a(foo.o), to request information about only that object file and not the entire library. (Typ- ically this argument must be quoted, ``libx.a(foo.o)'', to get it past the shell.) The options to strings(1) are: -a This option causes strings to look for strings in all sections of the object file (including the (__TEXT,__text) section. - This option causes strings to look for strings in all bytes of the files (the default for non-object files). -- This option causes strings to treat all the following arguments as files. -o Preceded each string by its offset in the file (in decimal). -t format Write each string preceded by its byte offset from the start of the file. The format shall be dependent on the single character used as the format option-argument: d The offset shall be written in decimal. o The offset shall be written in octal. x The offset shall be written in hexadecimal. -number The decimal number is used as the minimum string length rather than the default of 4. -n number Specify the minimum string length, where the number argument is a positive decimal integer. The default shall be 4. -arch arch_type Specifies the architecture, arch_type, of the file for strings(1) to operate on when the file is a universal file. (See arch(3) for the currently know arch_types.) The arch_type can be "all" to operate on all architectures in the file, which is the default. SEE ALSO
od(1) BUGS
The algorithm for identifying strings is extremely primitive. Apple Computer, Inc. September 11, 2006 STRINGS(1)