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# Convert tablespace flags to the format understood by MariaDB 10.1.0..10.1.20,
# with the assumption that the flags were correct.
sub convert_to_mariadb_101
{
my ($file, $page_size) = @_;
open(FILE, "+<", $file) or die "Unable to open $file\n";
sysread(FILE, $_, $page_size)==$page_size||die "Unable to read $file\n";
sysseek(FILE, 0, 0)||die "Unable to seek $file\n";
# FIL_PAGE_DATA + FSP_SPACE_FLAGS = 38 + 16 = 54 bytes from the start
my($flags) = unpack "x[54]N", $_;
my $badflags = ($flags & 0x3f);
my $compression_level=3;
$badflags |= 1<<6|$compression_level<<7 if ($flags & 1 << 16);
$badflags |= ($flags & 15 << 6) << 7; # PAGE_SSIZE
substr ($_, 54, 4) = pack("N", $badflags);
# Replace the innodb_checksum_algorithm=none checksum
substr ($_, 0, 4) = pack("N", 0xdeadbeef);
substr ($_, $page_size - 8, 4) = pack("N", 0xdeadbeef);
syswrite(FILE, $_, $page_size)==$page_size||die "Unable to write $file\n";
close(FILE);
}
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