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package resize_fat::any; # $Id: any.pm 267555 2010-04-15 12:45:18Z pterjan $
use diagnostics;
use strict;
use vars qw($FREE $FILE $DIRECTORY $UNMOVEABLE);
use common;
use resize_fat::fat;
use resize_fat::directory;
use resize_fat::dir_entry;
use resize_fat::c_rewritten;
$FREE = 0;
$FILE = 1;
$DIRECTORY = 2;
$UNMOVEABLE = 8;
1;
#- returns the number of clusters for a given filesystem type
sub min_cluster_count($) {
my ($fs) = @_;
(1 << ${{ FAT16 => 12, FAT32 => 12 }}{$fs->{fs_type}}) - 12;
}
sub max_cluster_count($) {
my ($fs) = @_;
(1 << ${{ FAT16 => 16, FAT32 => 28 }}{$fs->{fs_type}}) - 11;
}
#- patch to get the function last_used that return the last used cluster of a fs.
sub last_used($) {
my ($fs) = @_;
#- count in negative so absolute value count back to 2.
foreach (-($fs->{nb_clusters}+1)..-2) { return -$_ if resize_fat::c_rewritten::flag(-$_) }
die "any: empty FAT table of $fs->{nb_clusters} clusters";
}
#- patch to get the function last_unmoveable that return the last unmoveable cluster of a fs.
sub last_unmoveable($) {
my ($fs) = @_;
#- count in negative so absolute value count back to 2.
foreach (-($fs->{nb_clusters}+1)..-2) { return -$_ if 0x8 & resize_fat::c_rewritten::flag(-$_) }
#- Oh at this point there are no unmoveable blocks!
2;
}
#- calculates the minimum size of a partition, in physical sectors
sub min_size($) {
my ($fs) = @_;
my $count = $fs->{clusters}{count};
#- directories are both in `used' and `dirs', so are counted twice
#- It's done on purpose since we're moving all directories. So at the worse
#- moment, 2 directories are there, but that way nothing wrong can happen :)
my $min_cluster_count = max(2 + $count->{used} + $count->{bad} + $count->{dirs}, min_cluster_count($fs));
$min_cluster_count = max($min_cluster_count, last_unmoveable($fs));
my $size = $min_cluster_count * divide($fs->{cluster_size}, $SECTORSIZE) +
divide($fs->{cluster_offset}, $SECTORSIZE) +
64*1024*1024 / $SECTORSIZE; #- help with such more sectors (ie 64Mb).
#- help zindozs again with 512Mb+ at least else partition is ignored.
if ($resize_fat::isFAT32) {
$size = max($size, 524*1024*1024 / $SECTORSIZE);
}
$size;
}
#- calculates the maximum size of a partition, in physical sectors
sub max_size($) {
my ($fs) = @_;
my $max_cluster_count = min($fs->{nb_fat_entries} - 2, max_cluster_count($fs));
$max_cluster_count * divide($fs->{cluster_size}, $SECTORSIZE) +
divide($fs->{cluster_offset}, $SECTORSIZE);
}
#- calculates used size in order to avoid modifying anything.
sub used_size($) {
my ($fs) = @_;
my $last_used;
my $used_cluster_count;
eval { $last_used = last_used($fs) };
if ($@) {
# Empty FAT
$last_used = 0;
}
$used_cluster_count = max($last_used, min_cluster_count($fs));
$used_cluster_count * divide($fs->{cluster_size}, $SECTORSIZE) +
divide($fs->{cluster_offset}, $SECTORSIZE);
}
#- fills in fat_flag_map in c_rewritten.
#- Each FAT entry is flagged as either FREE, FILE or DIRECTORY.
sub flag_clusters {
my ($fs) = @_;
my ($cluster, $curr_dir_name, $entry, $type, $nb_dirs);
my $f = sub {
($curr_dir_name, $entry) = @_;
$cluster = resize_fat::dir_entry::get_cluster($entry);
if (resize_fat::dir_entry::is_file($entry)) {
$type = $FILE;
$type |= $UNMOVEABLE if resize_fat::dir_entry::is_unmoveable($entry);
} elsif (resize_fat::dir_entry::is_directory($entry)) {
$type = $DIRECTORY;
} else { return }
my $nb = resize_fat::c_rewritten::checkFat($cluster, $type, "$curr_dir_name/$entry->{name}");
$nb_dirs += $nb if $type == $DIRECTORY;
0;
};
#- this must call allocate_fat_flag that zeroes the buffer allocated.
resize_fat::c_rewritten::allocate_fat_flag($fs->{nb_clusters} + 2);
resize_fat::directory::traverse_all($fs, $f);
$fs->{clusters}{count}{dirs} = $nb_dirs;
}
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