function Archive_Tar::_writeHeader

Parameters

string $p_filename:

string $p_stored_filename:

Return value

bool

File

modules/system/system.tar.inc, line 1418

Class

Archive_Tar

Code

public function _writeHeader($p_filename, $p_stored_filename) {
    if ($p_stored_filename == '') {
        $p_stored_filename = $p_filename;
    }
    $v_reduced_filename = $this->_pathReduction($p_stored_filename);
    if (strlen($v_reduced_filename) > 99) {
        if (!$this->_writeLongHeader($v_reduced_filename, false)) {
            return false;
        }
    }
    $v_linkname = '';
    if (@is_link($p_filename)) {
        $v_linkname = readlink($p_filename);
    }
    if (strlen($v_linkname) > 99) {
        if (!$this->_writeLongHeader($v_linkname, true)) {
            return false;
        }
    }
    $v_info = lstat($p_filename);
    $v_uid = sprintf("%07s", DecOct($v_info[4]));
    $v_gid = sprintf("%07s", DecOct($v_info[5]));
    $v_perms = sprintf("%07s", DecOct($v_info['mode'] & 0777));
    $v_mtime = sprintf("%011s", DecOct($v_info['mtime']));
    if (@is_link($p_filename)) {
        $v_typeflag = '2';
        $v_size = sprintf("%011s", DecOct(0));
    }
    elseif (@is_dir($p_filename)) {
        $v_typeflag = "5";
        $v_size = sprintf("%011s", DecOct(0));
    }
    else {
        $v_typeflag = '0';
        clearstatcache();
        $v_size = sprintf("%011s", DecOct($v_info['size']));
    }
    $v_magic = 'ustar ';
    $v_version = ' ';
    $v_uname = '';
    $v_gname = '';
    if (function_exists('posix_getpwuid')) {
        $userinfo = posix_getpwuid($v_info[4]);
        $groupinfo = posix_getgrgid($v_info[5]);
        if (isset($userinfo['name'])) {
            $v_uname = $userinfo['name'];
        }
        if (isset($groupinfo['name'])) {
            $v_gname = $groupinfo['name'];
        }
    }
    $v_devmajor = '';
    $v_devminor = '';
    $v_prefix = '';
    $v_binary_data_first = pack("a100a8a8a8a12a12", $v_reduced_filename, $v_perms, $v_uid, $v_gid, $v_size, $v_mtime);
    $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $v_typeflag, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');
    // ----- Calculate the checksum
    $v_checksum = 0;
    // ..... First part of the header
    for ($i = 0; $i < 148; $i++) {
        $v_checksum += ord(substr($v_binary_data_first, $i, 1));
    }
    // ..... Ignore the checksum value and replace it by ' ' (space)
    for ($i = 148; $i < 156; $i++) {
        $v_checksum += ord(' ');
    }
    // ..... Last part of the header
    for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
        $v_checksum += ord(substr($v_binary_data_last, $j, 1));
    }
    // ----- Write the first 148 bytes of the header in the archive
    $this->_writeBlock($v_binary_data_first, 148);
    // ----- Write the calculated checksum
    $v_checksum = sprintf("%06s\x00 ", DecOct($v_checksum));
    $v_binary_data = pack("a8", $v_checksum);
    $this->_writeBlock($v_binary_data, 8);
    // ----- Write the last 356 bytes of the header in the archive
    $this->_writeBlock($v_binary_data_last, 356);
    return true;
}