1 package Git::PurePerl::PackIndex;
3 use MooseX::StrictConstructor;
5 use namespace::autoclean;
8 ( is => 'ro', isa => 'Path::Class::File', required => 1, coerce => 1 );
10 has 'fh' => ( is => 'rw', isa => 'IO::File', required => 0 );
13 ( is => 'rw', isa => 'ArrayRef[Int]', required => 0, auto_deref => 1, );
14 has 'size' => ( is => 'rw', isa => 'Int', required => 0 );
16 my $FanOutCount = 256;
18 my $IdxOffsetSize = 4;
21 my $OffsetStart = $FanOutCount * $IdxOffsetSize;
22 my $SHA1Start = $OffsetStart + $OffsetSize;
23 my $EntrySize = $OffsetSize + $SHA1Size;
24 my $EntrySizeV2 = $SHA1Size + $CrcSize + $OffsetSize;
28 my $filename = $self->filename;
30 my $fh = IO::File->new($filename) || confess($!);
34 $fh->seek( $self->global_offset, 0 );
35 foreach my $i ( 0 .. $FanOutCount - 1 ) {
36 $fh->read( my $data, $IdxOffsetSize );
37 my $offset = unpack( 'N', $data );
38 confess("pack has discontinuous index") if $offset < $offsets[-1];
39 push @offsets, $offset;
41 $self->offsets( \@offsets );
42 $self->size( $offsets[-1] );
45 __PACKAGE__->meta->make_immutable;