1 package Git::PurePerl::Pack::WithoutIndex;
3 use MooseX::StrictConstructor;
4 use namespace::autoclean;
6 extends 'Git::PurePerl::Pack';
8 has 'offsets' => ( is => 'rw', isa => 'HashRef', required => 0 );
10 my @TYPES = ( 'none', 'commit', 'tree', 'blob', 'tag', '', 'ofs_delta',
15 my $index_filename = $self->filename;
16 $index_filename =~ s/\.pack/.idx/;
17 my $index_fh = IO::File->new("> $index_filename") || die $!;
19 my $iod = IO::Digest->new( $index_fh, 'SHA1' );
21 my $offsets = $self->create_index_offsets;
23 foreach my $sha1 ( sort keys %$offsets ) {
24 my $offset = $offsets->{$sha1};
25 my $slot = unpack( 'C', pack( 'H*', $sha1 ) );
26 $fan_out_table[$slot]++;
28 foreach my $i ( 0 .. 255 ) {
29 $index_fh->print( pack( 'N', $fan_out_table[$i] || 0 ) ) || die $!;
30 $fan_out_table[ $i + 1 ] += $fan_out_table[$i] || 0;
32 foreach my $sha1 ( sort keys %$offsets ) {
33 my $offset = $offsets->{$sha1};
34 $index_fh->print( pack( 'N', $offset ) ) || die $!;
35 $index_fh->print( pack( 'H*', $sha1 ) ) || die $!;
38 # read the pack checksum from the end of the pack file
39 my $size = -s $self->filename;
41 $fh->seek( $size - 20, 0 ) || die $!;
42 my $read = $fh->read( my $pack_sha1, 20 ) || die $!;
44 $index_fh->print($pack_sha1) || die $!;
45 $index_fh->print( $iod->digest ) || die $!;
47 $index_fh->close() || die $!;
50 sub create_index_offsets {
54 $fh->read( my $signature, 4 );
55 $fh->read( my $version, 4 );
56 $version = unpack( 'N', $version );
57 $fh->read( my $objects, 4 );
58 $objects = unpack( 'N', $objects );
61 $self->offsets( \%offsets );
63 foreach my $i ( 1 .. $objects ) {
64 my $offset = $fh->tell || die "Error telling filehandle: $!";
65 my $obj_offset = $offset;
66 $fh->read( my $c, 1 ) || die "Error reading from pack: $!";
67 $c = unpack( 'C', $c ) || die $!;
70 my $size = ( $c & 0xf );
71 my $type_number = ( $c >> 4 ) & 7;
72 my $type = $TYPES[$type_number]
74 "invalid type $type_number at offset $offset, size $size";
78 while ( ( $c & 0x80 ) != 0 ) {
79 $fh->read( $c, 1 ) || die $!;
80 $c = unpack( 'C', $c ) || die $!;
82 $size |= ( ( $c & 0x7f ) << $shift );
88 if ( $type eq 'ofs_delta' || $type eq 'ref_delta' ) {
89 ( $type, $size, $content )
90 = $self->unpack_deltified( $type, $offset, $obj_offset, $size,
92 } elsif ( $type eq 'commit'
97 $content = $self->read_compressed( $offset, $size );
99 confess "invalid type $type";
102 my $raw = $type . ' ' . $size . "\0" . $content;
103 my $sha1 = Digest::SHA1->new;
105 my $sha1_hex = $sha1->hexdigest;
106 $offsets{$sha1_hex} = $obj_offset;
113 my ( $self, $want_sha1 ) = @_;
114 my $offset = $self->offsets->{$want_sha1};
115 return unless $offset;
116 return $self->unpack_object($offset);
119 __PACKAGE__->meta->make_immutable;