| #!/usr/bin/perl |
| # |
| # Script to find the "patch area" of ldlinux.sys |
| # |
| |
| eval { use bytes; }; |
| |
| open(SYS, "< ldlinux.sys") or die "$0: Cannot open ldlinux.sys\n"; |
| eval { binmode SYS; }; |
| if ( read(SYS,$sec1,512) != 512 ) { |
| die "$0: ldlinux.sys: short read\n"; |
| } |
| close(SYS); |
| |
| for ( $i = 0 ; $i < 512; $i++ ) { |
| $scan = substr($sec1,$i,12); |
| |
| if ( $scan eq "\032LDLINUX SYS" && |
| substr($sec1,$i+16,2) eq "\x55\xAA" ) { |
| last; |
| } |
| } |
| |
| |
| die "$0: Did not find patch area signature\n" unless ( $i < 512 ); |
| |
| # Past signature, plus align to the subsequent dword. |
| print ((($i+18)+3) & ~3); print "\n"; |
