86 lines
2.9 KiB
OCaml
86 lines
2.9 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* OCaml *)
|
|
(* *)
|
|
(* Xavier Leroy, projet Gallium, INRIA Paris *)
|
|
(* *)
|
|
(* Copyright 2015 Institut National de Recherche en Informatique et *)
|
|
(* en Automatique. All rights reserved. This file is distributed *)
|
|
(* under the terms of the Q Public License version 1.0. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
(* Compare two bytecode executables for equality.
|
|
Ignore loader prefix and debug infos. *)
|
|
|
|
open Printf
|
|
|
|
let readtoc ic =
|
|
Bytesections.read_toc ic;
|
|
(Bytesections.toc(), Bytesections.pos_first_section ic)
|
|
|
|
type cmpresult = Same | Differ of int
|
|
|
|
let rec cmpbytes ic1 ic2 len ofs =
|
|
if len <= 0 then Same else begin
|
|
let c1 = input_char ic1 and c2 = input_char ic2 in
|
|
if c1 = c2 then cmpbytes ic1 ic2 (len - 1) (ofs + 1) else Differ ofs
|
|
end
|
|
|
|
let skip_section name =
|
|
name = "DBUG"
|
|
|
|
let cmpbyt file1 file2 =
|
|
let ic1 = open_in_bin file1 in
|
|
let (toc1, pos1) = readtoc ic1 in
|
|
let ic2 = open_in_bin file2 in
|
|
let (toc2, pos2) = readtoc ic2 in
|
|
seek_in ic1 pos1;
|
|
seek_in ic2 pos2;
|
|
let rec cmpsections t1 t2 =
|
|
match t1, t2 with
|
|
| [], [] ->
|
|
true
|
|
| (name1, len1) :: t1, t2 when skip_section name1 ->
|
|
seek_in ic1 (pos_in ic1 + len1);
|
|
cmpsections t1 t2
|
|
| t1, (name2, len2) :: t2 when skip_section name2 ->
|
|
seek_in ic2 (pos_in ic2 + len2);
|
|
cmpsections t1 t2
|
|
| [], _ ->
|
|
eprintf "%s has more sections than %s\n" file2 file1;
|
|
false
|
|
| _, [] ->
|
|
eprintf "%s has more sections than %s\n" file1 file2;
|
|
false
|
|
| (name1, len1) :: t1, (name2, len2) :: t2 ->
|
|
if name1 <> name2 then begin
|
|
eprintf "Section mismatch: %s (in %s) / %s (in %s)\n"
|
|
name1 file1 name2 file2;
|
|
false
|
|
end else if len1 <> len2 then begin
|
|
eprintf "Length of section %s differ: %d (in %s) / %d (in %s)\n"
|
|
name1 len1 file1 len2 file2;
|
|
false
|
|
end else begin
|
|
match cmpbytes ic1 ic2 len1 0 with
|
|
| Differ ofs ->
|
|
eprintf "Files %s and %s differ: section %s, offset %d\n"
|
|
file1 file2 name1 ofs;
|
|
false
|
|
| Same ->
|
|
cmpsections t1 t2
|
|
end
|
|
in
|
|
let res = cmpsections toc1 toc2 in
|
|
close_in ic1; close_in ic2;
|
|
res
|
|
|
|
let _ =
|
|
if Array.length Sys.argv <> 3 then begin
|
|
eprintf "Usage: cmpbyt <file 1> <file 2>\n";
|
|
exit 2
|
|
end;
|
|
if cmpbyt Sys.argv.(1) Sys.argv.(2) then exit 0 else exit 2
|
|
|