READELF.PAS

{ @author: Sylvain Maltais (support@gladir.com)
  @created: 2023
  @website(https://www.gladir.com/linux-0)
  @abstract(Target: Turbo Pascal 7, Free Pascal 3.2)
}

Program READELF;

{$A-}

Var
 I:Integer;
 FileELF:File;
 ByteReaded:Word;
 Header:Record
  Sign:Array[0..3]of Char;
  Format,MemCellFormat:Byte;
  Version:Byte;
  OSABI:Byte;
  Inused1:Array[8..15]of Byte;
  FileType:Word;
  InstructionUsed:Word;
 End;
 ShowHeader:Boolean;

BEGIN
 If(ParamStr(1)='/?')or(ParamStr(1)='--help')or(ParamStr(1)='-H')or
   (ParamStr(1)='/h')or(ParamStr(1)='/H')Then Begin
  WriteLn('READELF: Cette commande permet d''afficher des ',
                   'informations sur un ELF.');
  WriteLn;
  WriteLn('Syntaxe: READELF -h|--file-header programme[.ELF]');
  WriteLn;
  WriteLn('programme      Ce paramŠtre permet d''indiquer le nom du programme.');
  WriteLn('-h             Ce paramŠtre permet d''indiquer qu''il faut ',
                          'afficher les informations d''entˆte.');
  WriteLn('--file-header  Ce paramŠtre permet d''indiquer qu''il faut ',
                          'afficher les informations d''entˆte.');
 End
  Else
 If ParamCount>0Then Begin
  ShowHeader:=False;
  For I:=1 to ParamCount do Begin
   If ParamStr(I)='-h'Then ShowHeader:=True;
   If ParamStr(I)='--file-header'Then ShowHeader:=True;
  End;
  If(ShowHeader)Then Begin
   For I:=1 to ParamCount do
    If Not((ParamStr(I)='-h')or(ParamStr(I)='--file-header'))Then Begin
    {$I+}Assign(FileELF,ParamStr(I));
    Reset(FileELF,1);{$I-}
    If IOResult<>0 Then Begin
     WriteLn('Erreur de lecture du fichier ',ParamStr(I),' !');
     Halt;
    End;
    Seek(FileELF,0);
    BlockRead(FileELF,Header,SizeOf(Header),ByteReaded);
    If ByteReaded=0 Then Begin
     WriteLn('Erreur de lecture de l''entˆte ELF');
     Halt;
    End
     Else
    If(Header.Sign[0]=#$7F)and(Header.Sign[1]='E')and
      (Header.Sign[2]='L')and(Header.Sign[3]='F')Then Begin
     WriteLn('Entˆte ELF:');
     WriteLn('  Type de fichier :    ','ELF');
     Write  ('  Format :             ');
     Case Header.Format of
      1:WriteLn('32 bits');
      2:WriteLn('64 bits');
      Else WriteLn('Inconnu : ',Header.Format);
     End;
     Write  ('  Format des cellules: ');
     Case Header.MemCellFormat of
      1:WriteLn('Petite-Boutiste - Little Endian (LSB)');
      2:WriteLn('Gros-Boutiste - Big Endian (MSB)');
      Else WriteLn('Inconnu : ',Header.Format);
     End;
     WriteLn('  Version ELF :        ',Header.Version);
     Write  ('  Interface binaire (ABI) :');
     Case Header.OSABI of
      0:WriteLn('UNIX System V');
      1:WriteLn('HP-UX');
      2:WriteLn('NetBSD');
      3:WriteLn('Linux');
      6:WriteLn('Sun Solaris');
      7:WriteLn('IBM AIX');
      8:WriteLn('SGI Irix');
      9:WriteLn('FreeBSD');
      10:WriteLn('Compaq TRU64');
      11:WriteLn('Novell Modesto');
      12:WriteLn('OpenBSD');
      64:WriteLn('ARM EABI');
      97:WriteLn('ARM');
      255:WriteLn('Standalone');
      Else WriteLn('Inconnu')
     End;
     Write  ('  Type de fichier :        ');
     Case Header.FileType of
      1:WriteLn('Repositionable');
      2:WriteLn('Ex‚cutable');
      3:WriteLn('Partag‚');
      4:WriteLn('Coeur du systŠme d''exploitation');
      Else WriteLn('Inconnu')
     End;
     Write  ('  Ensemble d''instructions :');
     Case Header.InstructionUsed of
      $00:WriteLn('Architecture non sp‚cifi‚.');
      $02:WriteLn('Sparc');
      $03:WriteLn('80x86');
      $08:WriteLn('MIPS');
      $14:WriteLn('PowerPC');
      $28:WriteLn('ARM');
      $2A:WriteLn('SuperH');
      $32:WriteLn('IA-64');
      $3E:WriteLn('x86-64');
      $B7:WriteLn('AArch64');
      Else WriteLn('Inconnu')
     End;
    End
     Else
    WriteLn('Signature ELF invalide');
    Close(FileELF);
   End;
  End
   Else
  WriteLn('ParamŠtre attendue !');
 End;
END.