package resize_fat::directory; # $Id: directory.pm 202834 2003-04-24 19:00:12Z prigaux $ use diagnostics; use strict; use common; use resize_fat::dir_entry; use resize_fat::io; my $format = "a8 a3 C C C S7 I"; my @fields = ( 'name', 'extension', 'attributes', 'is_upper_case_name', 'creation_time_low', #- milliseconds 'creation_time_high', 'creation_date', 'access_date', 'first_cluster_high', #- for FAT32 'time', 'date', 'first_cluster', 'length', ); my $psizeof_format = psizeof($format); 1; sub entry_size() { $psizeof_format } #- call `f' for each entry of the directory #- if f return true, then modification in the entry are taken back sub traverse($$$) { my ($directory, $curr_dir_name, $f) = @_; for (my $i = 0;; $i++) { my $raw = \substr($directory, $i * $psizeof_format, $psizeof_format); #- empty entry means end of directory $$raw =~ /^\0*$/ and return $directory; my $entry; @$entry{@fields} = unpack $format, $$raw; &$f($curr_dir_name, $entry) and $$raw = pack $format, @$entry{@fields}; } $directory; } sub traverse_all($$) { my ($fs, $f) = @_; my $traverse_all; $traverse_all = sub { my ($curr_dir_name, $entry) = @_; &$f($curr_dir_name, $entry); resize_fat::dir_entry::is_directory($entry) and traverse(resize_fat::io::read_file($fs, resize_fat::dir_entry::get_cluster($entry)), "$curr_dir_name/$entry->{name}", $traverse_all); undef; #- no need to write back (cf traverse) }; my $directory = $resize_fat::isFAT32 ? resize_fat::io::read_file($fs, $fs->{fat32_root_dir_cluster}) : resize_fat::io::read($fs, $fs->{root_dir_offset}, $fs->{root_dir_size}); traverse($directory, "", $traverse_all); undef $traverse_all; #- circular reference is no good for perl's poor GC :( } #- function used by construct_dir_tree to translate the `cluster' fields in each #- directory entry sub remap($$) { my ($_fs, $directory) = @_; traverse($directory, "", \&resize_fat::dir_entry::remap); }