/usr/share/perl5/Git/PurePerl/PackIndex.pm is in libgit-pureperl-perl 0.53-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | package Git::PurePerl::PackIndex;
use Moose;
use MooseX::StrictConstructor;
use IO::File;
use namespace::autoclean;
has 'filename' =>
( is => 'ro', isa => 'Path::Class::File', required => 1, coerce => 1 );
has 'fh' => ( is => 'rw', isa => 'IO::File', required => 0 );
has 'offsets' =>
( is => 'rw', isa => 'ArrayRef[Int]', required => 0, auto_deref => 1, );
has 'size' => ( is => 'rw', isa => 'Int', required => 0 );
my $FanOutCount = 256;
my $SHA1Size = 20;
my $IdxOffsetSize = 4;
my $OffsetSize = 4;
my $CrcSize = 4;
my $OffsetStart = $FanOutCount * $IdxOffsetSize;
my $SHA1Start = $OffsetStart + $OffsetSize;
my $EntrySize = $OffsetSize + $SHA1Size;
my $EntrySizeV2 = $SHA1Size + $CrcSize + $OffsetSize;
sub BUILD {
my $self = shift;
my $filename = $self->filename;
my $fh = IO::File->new($filename) || confess($!);
$self->fh($fh);
my @offsets = (0);
$fh->seek( $self->global_offset, 0 );
foreach my $i ( 0 .. $FanOutCount - 1 ) {
$fh->read( my $data, $IdxOffsetSize );
my $offset = unpack( 'N', $data );
confess("pack has discontinuous index") if $offset < $offsets[-1];
push @offsets, $offset;
}
$self->offsets( \@offsets );
$self->size( $offsets[-1] );
}
__PACKAGE__->meta->make_immutable;
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