1package Archive::Tar::Constant;
2
3BEGIN {
4    require Exporter;
5
6    $VERSION    = '0.02';
7    @ISA        = qw[Exporter];
8
9    require Time::Local if $^O eq "MacOS";
10}
11
12use Package::Constants;
13@EXPORT = Package::Constants->list( __PACKAGE__ );
14
15use constant FILE           => 0;
16use constant HARDLINK       => 1;
17use constant SYMLINK        => 2;
18use constant CHARDEV        => 3;
19use constant BLOCKDEV       => 4;
20use constant DIR            => 5;
21use constant FIFO           => 6;
22use constant SOCKET         => 8;
23use constant UNKNOWN        => 9;
24use constant LONGLINK       => 'L';
25use constant LABEL          => 'V';
26
27use constant BUFFER         => 4096;
28use constant HEAD           => 512;
29use constant BLOCK          => 512;
30
31use constant COMPRESS_GZIP  => 9;
32use constant COMPRESS_BZIP  => 'bzip2';
33
34use constant BLOCK_SIZE     => sub { my $n = int($_[0]/BLOCK); $n++ if $_[0] % BLOCK; $n * BLOCK };
35use constant TAR_PAD        => sub { my $x = shift || return; return "\0" x (BLOCK - ($x % BLOCK) ) };
36use constant TAR_END        => "\0" x BLOCK;
37
38use constant READ_ONLY      => sub { shift() ? 'rb' : 'r' };
39use constant WRITE_ONLY     => sub { $_[0] ? 'wb' . shift : 'w' };
40use constant MODE_READ      => sub { $_[0] =~ /^r/ ? 1 : 0 };
41
42# Pointless assignment to make -w shut up
43my $getpwuid; $getpwuid = 'unknown' unless eval { my $f = getpwuid (0); };
44my $getgrgid; $getgrgid = 'unknown' unless eval { my $f = getgrgid (0); };
45use constant UNAME          => sub { $getpwuid || scalar getpwuid( shift() ) || '' };
46use constant GNAME          => sub { $getgrgid || scalar getgrgid( shift() ) || '' };
47use constant UID            => $>;
48use constant GID            => (split ' ', $) )[0];
49
50use constant MODE           => do { 0666 & (0777 & ~umask) };
51use constant STRIP_MODE     => sub { shift() & 0777 };
52use constant CHECK_SUM      => "      ";
53
54use constant UNPACK         => 'A100 A8 A8 A8 A12 A12 A8 A1 A100 A6 A2 A32 A32 A8 A8 A155 x12';
55use constant PACK           => 'a100 a8 a8 a8 a12 a12 A8 a1 a100 a6 a2 a32 a32 a8 a8 a155 x12';
56use constant NAME_LENGTH    => 100;
57use constant PREFIX_LENGTH  => 155;
58
59use constant TIME_OFFSET    => ($^O eq "MacOS") ? Time::Local::timelocal(0,0,0,1,0,70) : 0;
60use constant MAGIC          => "ustar";
61use constant TAR_VERSION    => "00";
62use constant LONGLINK_NAME  => '././@LongLink';
63use constant PAX_HEADER     => 'pax_global_header';
64
65                            ### allow ZLIB to be turned off using ENV: DEBUG only
66use constant ZLIB           => do { !$ENV{'PERL5_AT_NO_ZLIB'} and
67                                        eval { require IO::Zlib };
68                                    $ENV{'PERL5_AT_NO_ZLIB'} || $@ ? 0 : 1
69                                };
70
71                            ### allow BZIP to be turned off using ENV: DEBUG only
72use constant BZIP           => do { !$ENV{'PERL5_AT_NO_BZIP'} and
73                                        eval { require IO::Uncompress::Bunzip2;
74                                               require IO::Compress::Bzip2; };
75                                    $ENV{'PERL5_AT_NO_BZIP'} || $@ ? 0 : 1
76                                };
77
78use constant GZIP_MAGIC_NUM => qr/^(?:\037\213|\037\235)/;
79use constant BZIP_MAGIC_NUM => qr/^BZh\d/;
80
81use constant CAN_CHOWN      => sub { ($> == 0 and $^O ne "MacOS" and $^O ne "MSWin32") };
82use constant CAN_READLINK   => ($^O ne 'MSWin32' and $^O !~ /RISC(?:[ _])?OS/i and $^O ne 'VMS');
83use constant ON_UNIX        => ($^O ne 'MSWin32' and $^O ne 'MacOS' and $^O ne 'VMS');
84use constant ON_VMS         => $^O eq 'VMS';
85
861;
87