88 lines
3.2 KiB
OCaml
88 lines
3.2 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Gallium, INRIA Paris *)
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(* *)
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(* Copyright 2015 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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(* Compare two bytecode executables for equality.
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Ignore loader prefix and debug infos. *)
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open Printf
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let readtoc ic =
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Bytesections.read_toc ic;
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(Bytesections.toc(), Bytesections.pos_first_section ic)
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type cmpresult = Same | Differ of int
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let rec cmpbytes ic1 ic2 len ofs =
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if len <= 0 then Same else begin
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let c1 = input_char ic1 and c2 = input_char ic2 in
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if c1 = c2 then cmpbytes ic1 ic2 (len - 1) (ofs + 1) else Differ ofs
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end
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let skip_section name =
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name = "DBUG"
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let cmpbyt file1 file2 =
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let ic1 = open_in_bin file1 in
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let (toc1, pos1) = readtoc ic1 in
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let ic2 = open_in_bin file2 in
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let (toc2, pos2) = readtoc ic2 in
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seek_in ic1 pos1;
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seek_in ic2 pos2;
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let rec cmpsections t1 t2 =
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match t1, t2 with
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| [], [] ->
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true
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| (name1, len1) :: t1, t2 when skip_section name1 ->
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seek_in ic1 (pos_in ic1 + len1);
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cmpsections t1 t2
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| t1, (name2, len2) :: t2 when skip_section name2 ->
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seek_in ic2 (pos_in ic2 + len2);
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cmpsections t1 t2
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| [], _ ->
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eprintf "%s has more sections than %s\n" file2 file1;
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false
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| _, [] ->
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eprintf "%s has more sections than %s\n" file1 file2;
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false
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| (name1, len1) :: t1, (name2, len2) :: t2 ->
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if name1 <> name2 then begin
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eprintf "Section mismatch: %s (in %s) / %s (in %s)\n"
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name1 file1 name2 file2;
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false
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end else if len1 <> len2 then begin
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eprintf "Length of section %s differ: %d (in %s) / %d (in %s)\n"
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name1 len1 file1 len2 file2;
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false
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end else begin
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match cmpbytes ic1 ic2 len1 0 with
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| Differ ofs ->
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eprintf "Files %s and %s differ: section %s, offset %d\n"
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file1 file2 name1 ofs;
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false
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| Same ->
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cmpsections t1 t2
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end
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in
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let res = cmpsections toc1 toc2 in
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close_in ic1; close_in ic2;
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res
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let _ =
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if Array.length Sys.argv <> 3 then begin
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eprintf "Usage: cmpbyt <file 1> <file 2>\n";
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exit 2
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end;
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if cmpbyt Sys.argv.(1) Sys.argv.(2) then exit 0 else exit 2
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