public function Archive_Tar::_writeLongHeader
public Archive_Tar::_writeLongHeader($p_filename)
Parameters
string $p_filename:
Return value
bool
File
- modules/system/system.tar.inc, line 1618
Class
Code
public function _writeLongHeader($p_filename) { $v_size = sprintf("%11s ", DecOct(strlen($p_filename))); $v_typeflag = 'L'; $v_linkname = ''; $v_magic = ''; $v_version = ''; $v_uname = ''; $v_gname = ''; $v_devmajor = ''; $v_devminor = ''; $v_prefix = ''; $v_binary_data_first = pack( "a100a8a8a8a12a12", '././@LongLink', 0, 0, 0, $v_size, 0 ); $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 $v_checksum = sprintf("%06s ", DecOct($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); // ----- Write the filename as content of the block $i = 0; while (($v_buffer = substr($p_filename, (($i++) * 512), 512)) != '') { $v_binary_data = pack("a512", "$v_buffer"); $this->_writeBlock($v_binary_data); } return true; }
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https://api.drupal.org/api/drupal/modules!system!system.tar.inc/function/Archive_Tar::_writeLongHeader/7.x