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#!/usr/bin/rexx
/* --------------------------------------------------------------------------------------- */
/* No freakin' copyright, no stinkin' license, no guarantees or warranties                 */
/* (implied, explicit or whatever). Usage is totally and completely at your own risk.      */
/* Please keep this comment block as is when modifying this code. Thanks in advance,       */
/*   Ruurd Idenburg                                                                        */
/* --------------------------------------------------------------------------------------- */
/*   2016/04/04  Initial version - Ruurd Idenburg                                          */
/* --------------------------------------------------------------------------------------- */
/* Checks the architecture and bitness of a Windows executable ( EXE or DLL )              */
/* --------------------------------------------------------------------------------------- */
parse source os how name .
parse arg file_name
file_stream = .stream~new(file_name)
-- read the DOS header, PE offset is a 32 bit little-endian integer
parse value file_stream~charin(,64) with id 3 . 61 PE_offset
-- header should start with the magic 'MZ'
if id<>'MZ' then do
  raise syntax 88.917 array ("'"file_name"'", "is not a valid Windows executable")
end
-- read the PE header for 6 bytes at PE_offset (offset is little-endian base 0)
-- the last two bytes indicate the architecture and resulting bitness
parse value file_stream~charin(PE_offset~reverse~c2d+1,6) with id 3 . 5 arch
-- header should start with 'PE'
if id<>'PE' then do
  raise syntax 88.917 array ("'"file_name"'", "is not a PE conforming executable")
end
-- arch is little-endian
arch = arch~reverse
select
  when arch=='014c'x then res = 'i386->'32
  when arch=='0200'x then res = 'ia64->'64
  when arch=='8664'x then res = 'amd64->'64
  otherwise res = 'unknown->unknown'
end
if how=='COMMAND' then do
  -- Assuming we're running in Windows (in upcoming release we can use .pathseparator)
  say "The machine architecture->bitness for ["file_name~makearray("\")~lastitem"] is:" res
  exit
end
return res


 
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This page updated on Thu, 28 Apr 2016 14:59:56 +0200 by Ruurd Idenburg.