http://forum.exetools.com/showthread.php?t=10937

Here is my Length Disassembler Engine (LDE64) which allows to disasm 32 bits instructions or 64 bits ones. It is a relocatable engine and you can store it in an unwritable section.

The return value is the length of the analysed instruction or -1 if it is an invalid one.

;
; LDE64 (Length Disassembler Engine) for 32 bits plateforms
; FREEWARE
;
; programmed by BeatriX (French Reverse Engineering Team) http://binary-reverser.org
;
; release : 1.0 - 06-10-07
;
;
; Syntax for 32 bits disasm:
; push 0
; push Address2Disasm
; call LDE
;
; Syntax for 64 bits disasm:
; push 64
; push Address2Disasm
; call LDE
;
;******************************************************

it is able to read all intel instructions FPU, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 and VMX.

http://binary-reverser.org/tools/LDE64/

By the way, we continue to develop our project around disassembly here :

http://binary-reverser.org/tools/BeaEngine/index1.php

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