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https://github.com/xcat2/xNBA.git
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49 lines
1.4 KiB
Perl
49 lines
1.4 KiB
Perl
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#!/usr/bin/perl -w
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use warnings;
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use strict;
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use bytes;
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use constant MAX_ROM_LEN => 1024*1024;
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use constant PCI_OFF => 0x18;
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use constant INDICATOR_OFF => 0x15;
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my $total_len = 0;
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my @romfiles = @ARGV
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or die "Usage: $0 rom-file-1 rom-file-2 ... > multi-rom-file\n";
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while ( my $romfile = shift @romfiles ) {
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my $last = @romfiles ? 0 : 1;
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open ROM, "<$romfile" or die "Could not open $romfile: $!\n";
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my $len = read ( ROM, my $romdata, MAX_ROM_LEN )
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or die "Could not read $romfile: $!\n";
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close ROM;
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die "$romfile is not a ROM file\n"
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unless substr ( $romdata, 0, 2 ) eq "\x55\xAA";
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( my $checklen ) = unpack ( 'C', substr ( $romdata, 2, 1 ) );
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$checklen *= 512;
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die "$romfile has incorrect length field $checklen (should be $len)\n"
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unless $len == $checklen;
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( my $pci ) = unpack ( 'v', substr ( $romdata, PCI_OFF, 2 ) );
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die "Invalid PCI offset field in $romfile\n"
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if $pci >= $len;
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die "No PCIR signature in $romfile\n"
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unless substr ( $romdata, $pci, 4 ) eq "PCIR";
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( my $indicator ) =
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unpack ( 'C', substr ( $romdata, $pci + INDICATOR_OFF, 1 ) );
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my $msg = sprintf ( "$romfile: indicator was %02x, ", $indicator );
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$indicator &= ! ( 1 << 7 );
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$indicator |= ( $last << 7 );
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$msg .= sprintf ( "now %02x\n", $indicator );
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substr ( $romdata, $pci + INDICATOR_OFF, 1 ) = pack ( 'C', $indicator );
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warn $msg;
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print $romdata;
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}
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