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#!/usr/bin/perl
package resize_fat::main;
use diagnostics;
use strict;
use log;
use common qw(:common :system :constant);
use resize_fat::boot_sector;
use resize_fat::info_sector;
use resize_fat::directory;
use resize_fat::io;
use resize_fat::fat;
use resize_fat::any;
1;
# - reads in the boot sector/partition info., and tries to make some sense of it
sub new($$$) {
my ($type, $device, $fs_name) = @_;
my $fs = { device => $device, fs_name => $fs_name } ;
resize_fat::io::open($fs);
resize_fat::boot_sector::read($fs);
$resize_fat::isFAT32 and eval { resize_fat::info_sector::read($fs) };
resize_fat::fat::read($fs);
resize_fat::fat::check($fs);
resize_fat::any::flag_clusters($fs);
bless $fs, $type;
}
# copy all clusters >= <start_cluster> to a new place on the partition, less
# than <start_cluster>. Only copies files, not directories.
# (use of buffer needed because the seeks slow like hell the hard drive)
sub copy_clusters {
my ($fs, $cluster) = @_;
my @buffer;
my $flush = sub {
while (@buffer) {
my $cluster = shift @buffer;
resize_fat::io::write_cluster($fs, $cluster, shift @buffer);
}
};
for (; $cluster < $fs->{nb_clusters} + 2; $cluster++) {
$fs->{fat_flag_map}->[$cluster] == $resize_fat::any::FILE or next;
push @buffer, $fs->{fat_remap}->[$cluster], resize_fat::io::read_cluster($fs, $cluster);
@buffer > 50 and &$flush();
}
&$flush();
}
# Constructs the new directory tree to match the new file locations.
sub construct_dir_tree {
my ($fs) = @_;
if ($resize_fat::isFAT32) {
# fat32's root must remain in the first 64k clusters
# so don't set it as DIRECTORY, it will be specially handled
$fs->{fat_flag_map}->[$fs->{fat32_root_dir_cluster}] = $resize_fat::any::FREE;
}
for (my $cluster = 2; $cluster < $fs->{nb_clusters} + 2; $cluster++) {
$fs->{fat_flag_map}->[$cluster] == $resize_fat::any::DIRECTORY or next;
resize_fat::io::write_cluster($fs,
$fs->{fat_remap}->[$cluster],
resize_fat::directory::remap($fs, resize_fat::io::read_cluster($fs, $cluster)));
}
sync();
# until now, only free clusters have been written. it's a null operation if we stop here.
# it means no corruption :)
#
# now we must be as fast as possible!
# remapping non movable root directory
if ($resize_fat::isFAT32) {
my $cluster = $fs->{fat32_root_dir_cluster};
resize_fat::io::write_cluster($fs,
$fs->{fat_remap}->[$cluster],
resize_fat::directory::remap($fs, resize_fat::io::read_cluster($fs, $cluster)));
} else {
resize_fat::io::write($fs, $fs->{root_dir_offset}, $fs->{root_dir_size},
resize_fat::directory::remap($fs, resize_fat::io::read($fs, $fs->{root_dir_offset}, $fs->{root_dir_size})));
}
}
sub min_size($) { &resize_fat::any::min_size }
sub max_size($) { &resize_fat::any::max_size }
# resize
# - size is in sectors
# - checks boundaries before starting
# - copies all data beyond new_cluster_count behind the frontier
sub resize {
my ($fs, $size) = @_;
my ($min, $max) = (min_size($fs), max_size($fs));
$size += $min if $size =~ /^\+/;
$size >= $min or die "Minimum filesystem size is $min sectors";
$size <= $max or die "Maximum filesystem size is $max sectors";
log::l("resize_fat: Partition size fill be ", $size * $SECTORSIZE >> 20, "Mb (well exactly ${size} sectors)");
my $new_data_size = $size * $SECTORSIZE - $fs->{cluster_offset};
my $new_nb_clusters = divide($new_data_size, $fs->{cluster_size});
log::l("resize_fat: Allocating new clusters");
resize_fat::fat::allocate_remap($fs, $new_nb_clusters);
log::l("resize_fat: Copying files");
copy_clusters($fs, $new_nb_clusters);
log::l("resize_fat: Copying directories");
construct_dir_tree($fs);
log::l("Writing new FAT...");
resize_fat::fat::update($fs);
resize_fat::fat::write($fs);
$fs->{nb_sectors} = $size;
$fs->{nb_clusters} = $new_nb_clusters;
$fs->{clusters}->{count}->{free} =
$fs->{nb_clusters} - $fs->{clusters}->{count}->{used} - $fs->{clusters}->{count}->{bad} - 2;
$fs->{system_id} = 'was here!';
$fs->{small_nb_sectors} = 0;
$fs->{big_nb_sectors} = $size;
log::l("resize_fat: Writing new boot sector...");
resize_fat::boot_sector::write($fs);
$resize_fat::isFAT32 and eval { resize_fat::info_sector::write($fs) }; # doesn't matter if this fails - its pretty useless!
sync();
log::l("resize_fat: done");
}
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