How to identify .cab file?

[miskox]

Hello all!

Is there a simple way to identify if a file is Micrsoft Cabinet file (first four bytes are 'MSCF'):

Code: Select all

@echo off
REM (Windows XP version of expand)
dir >test.zip
REM expand should list files in the archive if OK
expand -D test.zip
echo ERRORLEVEL=%errorlevel%

Output:

Code: Select all

c:\>a.cmd
Microsoft (R) File Expansion Utility  Version 5.1.2600.0
Copyright (C) Microsoft Corp 1990-1999.  All rights reserved.

test.zip: test.zip

ERRORLEVEL=0

c:\>

As you can see expand does not report any errors.

So probably the best way would be to check first four bytes of a file. But this can take some time unless you guys have a quick solution.

Thanks.
Saso

[aGerman]

You can use FC /B to hex-dump the first few bytes. But maybe it's also sufficient for you to do a textual comparison.

Untested:

Code: Select all

@echo off &setlocal
set "file=test.zip"

setlocal EnableDelayedExpansion
<"!file!" set /p "somebytes="
if "!somebytes:~,4!" neq "MSCF" exit /b
endlocal

:: your code here ...

Steffen

[miskox]

Thanks Steffen!

This works.

Saso