1 package Archive::Tar::Constant;
8 FILE HARDLINK SYMLINK CHARDEV BLOCKDEV DIR FIFO SOCKET UNKNOWN
9 BUFFER HEAD READ_ONLY WRITE_ONLY UNPACK PACK TIME_OFFSET ZLIB
10 BLOCK_SIZE TAR_PAD TAR_END ON_UNIX BLOCK CAN_READLINK MAGIC
11 TAR_VERSION UNAME GNAME CAN_CHOWN MODE CHECK_SUM UID GID
12 GZIP_MAGIC_NUM MODE_READ LONGLINK LONGLINK_NAME PREFIX_LENGTH
13 LABEL NAME_LENGTH STRIP_MODE
16 require Time::Local if $^O eq "MacOS";
19 use constant FILE => 0;
20 use constant HARDLINK => 1;
21 use constant SYMLINK => 2;
22 use constant CHARDEV => 3;
23 use constant BLOCKDEV => 4;
24 use constant DIR => 5;
25 use constant FIFO => 6;
26 use constant SOCKET => 8;
27 use constant UNKNOWN => 9;
28 use constant LONGLINK => 'L';
29 use constant LABEL => 'V';
31 use constant BUFFER => 4096;
32 use constant HEAD => 512;
33 use constant BLOCK => 512;
35 use constant BLOCK_SIZE => sub { my $n = int($_[0]/BLOCK); $n++ if $_[0] % BLOCK; $n * BLOCK };
36 use constant TAR_PAD => sub { my $x = shift || return; return "\0" x (BLOCK - ($x % BLOCK) ) };
37 use constant TAR_END => "\0" x BLOCK;
39 use constant READ_ONLY => sub { shift() ? 'rb' : 'r' };
40 use constant WRITE_ONLY => sub { $_[0] ? 'wb' . shift : 'w' };
41 use constant MODE_READ => sub { $_[0] =~ /^r/ ? 1 : 0 };
43 # Pointless assigment to make -w shut up
44 my $getpwuid; $getpwuid = 'unknown' unless eval { my $f = getpwuid (0); };
45 my $getgrgid; $getgrgid = 'unknown' unless eval { my $f = getgrgid (0); };
46 use constant UNAME => sub { $getpwuid || scalar getpwuid( shift() ) };
47 use constant GNAME => sub { $getgrgid || scalar getgrgid( shift() ) };
48 use constant UID => $>;
49 use constant GID => (split ' ', $) )[0];
51 use constant MODE => do { 0666 & (0777 & ~umask) };
52 use constant STRIP_MODE => sub { shift() & 0777 };
53 use constant CHECK_SUM => " ";
55 use constant UNPACK => 'A100 A8 A8 A8 A12 A12 A8 A1 A100 A6 A2 A32 A32 A8 A8 A155 x12';
56 use constant PACK => 'a100 a8 a8 a8 a12 a12 A8 a1 a100 a6 a2 a32 a32 a8 a8 a155 x12';
57 use constant NAME_LENGTH => 100;
58 use constant PREFIX_LENGTH => 155;
60 use constant TIME_OFFSET => ($^O eq "MacOS") ? Time::Local::timelocal(0,0,0,1,0,70) : 0;
61 use constant MAGIC => "ustar";
62 use constant TAR_VERSION => "00";
63 use constant LONGLINK_NAME => '././@LongLink';
65 use constant ZLIB => do { eval { require IO::Zlib }; $@ ? 0 : 1 };
66 use constant GZIP_MAGIC_NUM => qr/^(?:\037\213|\037\235)/;
68 use constant CAN_CHOWN => do { ($> == 0 and $^O ne "MacOS" and $^O ne "MSWin32") };
69 use constant CAN_READLINK => ($^O ne 'MSWin32' and $^O !~ /RISC(?:[ _])?OS/i and $^O ne 'VMS');
70 use constant ON_UNIX => ($^O ne 'MSWin32' and $^O ne 'MacOS' and $^O ne 'VMS');