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#!/usr/bin/perl
@ARGV == 1 or die "usage: remove-splash <initrd>\n";
my $magic = 'BOOTSPL3';
my $buffer_size = 15;
my ($initrd) = @ARGV;
open(my $F, "+< $initrd") or die "can't open $initrd: $!\n";
while (1) {
my $got = read($F, my $buffer, $buffer_size);
$got > length($magic) or last;
my $index = index($buffer, $magic);
if ($index >= 0) {
my $offset = $index + tell($F) - $got;
seek($F, $offset + 12, 0) && read($F, my $tmp, 4) or last;
my $splash_size = unpack("V", $tmp) + 38;
my $initrd_size = seek($F, 0, 2) && tell($F);
if ($offset + $splash_size == $initrd_size) {
truncate($F, $offset);
exit 0;
} else {
warn "bootsplash found at offset $offset, but it is not at the end ($offset + $splash_size != $initrd_size)\n";
}
}
seek($F, -length($magic), 1); # handle the case BOOTSPL3 when overlaps between buffers
}
warn "bootsplash not found in $initrd\n";
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