diff options
Diffstat (limited to 'perl-install/resize_fat/fat.pm')
-rw-r--r-- | perl-install/resize_fat/fat.pm | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/perl-install/resize_fat/fat.pm b/perl-install/resize_fat/fat.pm deleted file mode 100644 index 31643f0a3..000000000 --- a/perl-install/resize_fat/fat.pm +++ /dev/null @@ -1,138 +0,0 @@ -package resize_fat::fat; # $Id$ - -use diagnostics; -use strict; - -use resize_fat::any; -use resize_fat::io; -use resize_fat::c_rewritten; - -1; - -sub read($) { - my ($fs) = @_; - - resize_fat::c_rewritten::read_fat(fileno $fs->{fd}, $fs->{fat_offset}, $fs->{fat_size}, $fs->{media}); - - @{$fs->{clusters}{count}}{qw(free bad used)} = - resize_fat::c_rewritten::scan_fat($fs->{nb_clusters}, $fs->{fs_type_size}); -} - -sub write($) { - my ($fs) = @_; - - sysseek $fs->{fd}, $fs->{fat_offset}, 0 or die "write_fat: seek failed"; - foreach (1..$fs->{nb_fats}) { - resize_fat::c_rewritten::write_fat(fileno $fs->{fd}, $fs->{fat_size}); - } -} - - - -#- allocates where all the clusters will be moved to. Clusters before cut_point -#- remain in the same position, however cluster that are part of a directory are -#- moved regardless (this is a mechanism to prevent data loss) (cut_point is the -#- first cluster that won't occur in the new fs) -sub allocate_remap { - my ($fs, $cut_point) = @_; - my ($cluster, $new_cluster); - my $remap = sub { resize_fat::c_rewritten::set_fat_remap($cluster, $new_cluster) }; - my $get_new = sub { - $new_cluster = get_free($fs); - 0 < $new_cluster && $new_cluster < $cut_point or die "no free clusters"; - set_eof($fs, $new_cluster); #- mark as used - #-log::ld("resize_fat: [$cluster,", &next($fs, $cluster), "...]->$new_cluster..."); - }; - - #- this must call allocate_fat_remap that zeroes the buffer allocated. - resize_fat::c_rewritten::allocate_fat_remap($fs->{nb_clusters} + 2); - - $fs->{last_free_cluster} = 2; - for ($cluster = 2; $cluster < $fs->{nb_clusters} + 2; $cluster++) { - if ($cluster < $cut_point) { - if (resize_fat::c_rewritten::flag($cluster) == $resize_fat::any::DIRECTORY) { - &$get_new(); - } else { - $new_cluster = $cluster; - } - &$remap(); - } elsif (!is_empty(&next($fs, $cluster))) { - &$get_new(); - &$remap(); - } - } -} - - -#- updates the fat for the resized filesystem -sub update { - my ($fs) = @_; - - for (my $cluster = 2; $cluster < $fs->{nb_clusters} + 2; $cluster++) { - if (resize_fat::c_rewritten::flag($cluster)) { - my $old_next = &next($fs, $cluster); - my $new = resize_fat::c_rewritten::fat_remap($cluster); - my $new_next = resize_fat::c_rewritten::fat_remap($old_next); - - set_available($fs, $cluster); - - is_eof($old_next) ? - set_eof($fs, $new) : - set_next ($fs, $new, $new_next); - } - } -} - - -sub endianness16($) { (($_[0] & 0xff) << 8) + ($_[0] >> 8); } -sub endianness($$) { - my ($val, $nb_bits) = @_; - my $r = 0; - for (; $nb_bits > 0; $nb_bits -= 8) { - $r <<= 8; - $r += $val & 0xff; - $val >>= 8; - } - $nb_bits < 0 and die "error: endianness only handle numbers divisible by 8"; - $r; -} - -*next = \&resize_fat::c_rewritten::next; -*set_next = \&resize_fat::c_rewritten::set_next; - - - -sub get_free($) { - my ($fs) = @_; - foreach (my $i = 0; $i < $fs->{nb_clusters}; $i++) { - my $cluster = ($i + $fs->{last_free_cluster} - 2) % $fs->{nb_clusters} + 2; - is_available(&next($fs, $cluster)) and return $fs->{last_free_cluster} = $cluster; - } - die "no free clusters"; -} - -#- returns true if <cluster> represents an EOF marker -sub is_eof($) { - my ($cluster) = @_; - $cluster >= $resize_fat::bad_cluster_value; -} -sub set_eof($$) { - my ($fs, $cluster) = @_; - set_next ($fs, $cluster, $resize_fat::bad_cluster_value + 1); -} - -#- returns true if <cluster> is empty. Note that this includes bad clusters. -sub is_empty($) { - my ($cluster) = @_; - $cluster == 0 || $cluster == $resize_fat::bad_cluster_value; -} - -#- returns true if <cluster> is available. -sub is_available($) { - my ($cluster) = @_; - $cluster == 0; -} -sub set_available($$) { - my ($fs, $cluster) = @_; - set_next ($fs, $cluster, 0); -} |