Branch for updates

1 files changed, 79 insertions, 0 deletions

diff --git a/perl-install/resize_fat/directory.pm b/perl-install/resize_fat/directory.pm
new file mode 100644
index 000000000..addf757d0
--- /dev/null
+++ b/perl-install/resize_fat/directory.pm
@@ -0,0 +1,79 @@
+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);
+}