static bool IdentifyWinExeHeader( FILE *fh, bool win16 )
{
os2_exe_header os2_hdr;
exe_pe_header pe_hdr;
uint_16 offset;
bool ok;
ok = ( fh != NULL );
if( ok ) {
ok = ( fseek( fh, 0x18, SEEK_SET ) == 0 );
}
/* check the reloc offset */
if( ok ) {
ok = ( fread( &offset, 1, sizeof( offset ), fh ) == sizeof( offset ) && offset >= 0x0040 );
}
if( ok ) {
ok = ( fseek( fh, NH_OFFSET, SEEK_SET ) == 0 );
}
/* check the header offset */
if( ok ) {
ok = ( fread( &offset, 1, sizeof( offset ), fh ) == sizeof( offset ) && offset != 0 );
}
/* seek to the header */
if( ok ) {
ok = ( fseek( fh, offset, SEEK_SET ) == 0 );
}
if( ok ) {
if( win16 ) {
ok = ( fread( &os2_hdr, 1, sizeof( os2_hdr ), fh ) == sizeof( os2_hdr ));
/* check for valid Win16 EXE */
if( ok ) {
return( WRIsHeaderValidWIN16( &os2_hdr ) );
}
} else {
ok = ( fread( &PE32( pe_hdr ), 1, sizeof( pe_header ), fh ) == sizeof( pe_header ) );
if( ok && IS_PE64( pe_hdr ) ) {
/* seek to the header again */
ok = ( fseek( fh, offset, SEEK_SET ) == 0 );
if( ok ) {
ok = ( fread( &PE64( pe_hdr ), 1, sizeof( pe_header64 ), fh ) == sizeof( pe_header64 ) );
}
}
/* check for valid Win32 EXE */
if( ok ) {
return( WRIsHeaderValidWINNT( &pe_hdr ) );
}
}
}
return( false );
}
long int WRReadWin16ExeHeader( WResFileID file_handle, os2_exe_header *header )
{
long int old_pos;
uint_16 offset;
int ok;
old_pos = -1;
ok = (file_handle != -1 && header != NULL);
if( ok ) {
ok = ((old_pos = ResSeek( file_handle, 0x18, SEEK_SET )) != -1);
}
/* check the reloc offset */
if( ok ) {
ResReadUint16( &offset, file_handle );
ok = (offset >= 0x0040);
}
if( ok ) {
ok = (ResSeek( file_handle, OS2_NE_OFFSET, SEEK_SET ) != -1);
}
/* check header offset */
if( ok ) {
ResReadUint16( &offset, file_handle );
ok = (offset != 0x0000);
}
if( ok ) {
ok = (ResSeek( file_handle, offset, SEEK_SET ) != -1);
}
if( ok ) {
ok = (read( file_handle, header, sizeof( os2_exe_header ) ) ==
sizeof( os2_exe_header ));
}
/* check for valid Win16 EXE */
if( ok ) {
ok = WRIsHeaderValidWIN16( header );
}
if( old_pos != -1 ) {
ok = (ResSeek( file_handle, old_pos, SEEK_SET ) != -1 && ok);
}
if( ok ) {
return( offset );
} else {
return( 0 );
}
}