Add NO_FILE_MANAGER_COMPAT to fix issue #1

README.md

@@ -12,8 +12,8 @@ but even smaller. It doesn't have a 64-bit version, though.**
 
 | mode etc.    | vondehi | trident | Fishypack | sh-based unpacker |
 |:------------ | -------:| -------:| ---------:| -----------------:|
-| gzip, 32-bit |     159 |     172 | 179? (198?) |        48 to 72 |
-| xz, 32-bit   | 162 (166*) |  179 |       186 |          48 to 72 |
+| gzip, 32-bit |     161 |     172 | 179? (198?) |        48 to 72 |
+| xz, 32-bit   | 164 (168*) |  179 |       186 |          48 to 72 |
 | gzip, 64-bit |     N/A |     208 |      208? |          48 to 72 |
 | xz, 64-bit   |     N/A |     217 |       217 |          48 to 72 |
 | Preserves args |     Y |       N |  tries to | can, but often not |
@@ -47,6 +47,7 @@ cat $out $intro_compressed > $final
 * `NO_UBUNTU_COMPAT` (default off): assume `/bin` is the same as `/usr/bin`.
   Originally named like this because on my machine, `/bin` is linked t
   `/usr/bin`, but on the Revision compomachine (which runs Ubuntu), it isn't.
+* `NO_FILE_MANAGER_COMPAT` (default off): save two bytes by putting instructions in the EI_CLASS and EI_DATA fields of the ELF header. Causes executables packed with vondehi to not be recognized as executable in file managers.
 * `USE_VFORK` (default off): use `vfork(2)` instead of `fork(2)`. I hope you
   know what you're doing when you enable this.
 * `TAG` (default empty): add a vanity tag right before the compressed data.

vondehi.asm

@@ -29,8 +29,14 @@ org 0xEBDB0000
 ehdr: ;~e_ident
 	; jg short 0x47 (inc ebp) ; dec esp ; inc esi
 	db 0x7F,"ELF"	;!E_MAGIC
+%ifndef NO_FILE_MANAGER_COMPAT
+	db 0x01 ;E_CLASS
+	db 0x01 ;E_DATA
+%endif
 _parent.0:
+%ifdef NO_FILE_MANAGER_COMPAT
 	xor ebx, ebx
+%endif
 	xchg eax, edi ;edi is zero now and will be overwritten eventually
 	mov al, SYS_waitpid
 	int 0x80
@@ -111,6 +117,9 @@ phdr.end equ phdr.endm1 + 1
 _start.4:
 	int 0x80
 
+%ifndef NO_FILE_MANAGER_COMPAT
+	xor ebx, ebx
+%endif
 	test eax, eax
 	jnz short _parent.0
 	;jz short _child