File "zbzipcore.php"
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<?php
/**
* pluginbuddy_zbzipcore Class
*
* Provides an abstract zip capability core class
*
* Version: 1.0.0
* Author:
* Author URI:
*
* @param $parent object Optional parent object which can provide functions for reporting, etc.
* @return null
*
*/
if ( !class_exists( "pluginbuddy_zbzipcore" ) ) {
/**
* pluginbuddy_stat Class
*
* Convenience for being able to augment the stat() function either in the event
* of failure or for cases where the actual file size reported is too large for the
* (signed) integer type in which case we create an additional associative field in
* the array which is a double and contains the file size.
* For now it's just some static methods but might extend to be a true class.
*
* @param string $filename The name of the file to stat
* @return array|bool False on failure otherwise array
*
*/
class pluginbuddy_stat {
const THIRTY_TWO_BIT = 32;
const SIXTY_FOUR_BIT = 64;
public static function is_php( $bits ) {
$result = ( ( PHP_INT_SIZE * 8 ) == $bits ) ? true : false;
return $result;
}
public static function stat( $filename ) {
$result = false;
// If the file is readable then we should be able to stat it
if ( @is_readable( $filename ) ) {
$stats = @stat( $filename );
if ( false !== $stats ) {
// Looks like we got some valid data - for now just process the size
if ( self::is_php( self::THIRTY_TWO_BIT ) ) {
// PHP is 32 bits so we may have a file size problem over 2GB.
// This is one way to test for a file size problem - there are others
if ( 0 > $stats[ 'size' ] ) {
// Unsigned long has been interpreted as a signed int and has sign bit
// set so is appearing as negative - magically convert it to a double
// Note: this only works to give us an extension from 2GB to 4GB but that
// should be enough as the underlying OS probably can't support >4GB or
// zip command cannot anyway
$stats[ 'dsize' ] = ( (double)0x80000000 + ( $stats[ 'size' ] & 0x7FFFFFFF ) );
} else {
// Assume it's valid
$stats[ 'dsize' ] = (double)$stats[ 'size' ];
}
} else {
// Looks like 64 bit PHP so file size should be fine
// Force added item to double for consistency
$stats[ 'dsize' ] = (double)$stats[ 'size' ];
}
// Add an additional item for short octal representation of mode
$stats[ 'mode_octal_four' ] = substr( sprintf( '%o', $stats[ 'mode' ] ), -4 );
$result = $stats;
} else {
// Hmm, stat() failed for some reason - could be an LFS problem with the
// way PHP has been built :-(
// TODO: Consider alternatives - may be able to use exec to run the
// command line stat function which _should_ be ok and we can map output
// into the same array format. This does depend on having exec() and the
// stat command available and it's definitely not a nice option
$result = false;
}
}
return $result;
}
}
abstract class pluginbuddy_zbzipcore {
// status method type parameter values - would like a class for this
const STATUS_TYPE_DETAILS = 'details';
// Constants for handling paths
const NORM_DIRECTORY_SEPARATOR = '/';
const DIRECTORY_SEPARATORS = '/\\';
// Constants for result handling
const MAX_ERROR_LINES_TO_SHOW = 20;
const MAX_WARNING_LINES_TO_SHOW = 20;
const MAX_OTHER_LINES_TO_SHOW = 20;
// Enumerated types that we need for now
// Note: Values must be sequential
const OS_TYPE_UNKNOWN = 0;
const OS_TYPE_NIX = 1;
const OS_TYPE_WIN = 2;
const OS_TYPE_MAX = 2;
const ZIP_WARNING_UNKNOWN = 0;
const ZIP_WARNING_GENERIC = 1;
const ZIP_WARNING_SKIPPED = 2;
const ZIP_WARNING_FILTERED = 3;
const ZIP_WARNING_LONGPATH = 4;
const ZIP_WARNING_IGNORED_SYMLINK = 5;
const ZIP_OTHER_UNKNOWN = 0;
const ZIP_OTHER_GENERIC = 1;
const ZIP_OTHER_SKIPPED = 2;
const ZIP_OTHER_FILTERED = 3;
const ZIP_OTHER_LONGPATH = 4;
const ZIP_OTHER_IGNORED_SYMLINK = 5;
const COMMAND_UNKNOWN_PATH = 0;
const COMMAND_ZIP_PATH = 1;
const COMMAND_UNZIP_PATH = 2;
public $_version = '1.0';
/**
* The plugin path for this plugin
*
* @var $_pluginPath string
*/
public $_pluginPath = '';
/**
* The path of this directory node
*
* @var path string
*/
protected $_path = "";
/**
* The absolute paths to be excluded, must be / terminated
*
* @var paths_to_exclude array of string
*/
protected $_paths_to_exclude = array();
/**
* The details of the method
*
* @var method_details array
*/
protected $_method_details = array();
/**
* The set of paths where to look for executables
*
* @var executable_paths array
*/
protected $_executable_paths = array();
/**
* Array of status information
*
* @var status array
*/
protected $_status = array();
/**
* Enumerated OS type
*
* @var os_type int
*/
protected $_os_type = self::OS_TYPE_UNKNOWN;
/**
* Convenience boolean indicating if PHP has exec_dir set or not
*
* @var exec_dir_set bool
*/
protected $_exec_dir_set = false;
/**
* Convenience boolean indicating if Warnings should be ignored when building archives
*
* @var ignore_warnings bool
*/
protected $_ignore_warnings = false;
/**
* Convenience boolean indicating if symlinks should be ignored/not-followed when building archives
*
* @var ignore_symlinks bool
*/
protected $_ignore_symlinks = false;
/**
* Convenience boolean indicating if compression shoul dbe used when building archives
*
* @var compression bool
*/
protected $_compression = false;
/**
* Used to translate our warnings reasons into a longer description
*
* @var array
*/
public static $_warning_desc = array( self::ZIP_WARNING_UNKNOWN => 'warning reason unknown',
self::ZIP_WARNING_GENERIC => 'general problem as indicated',
self::ZIP_WARNING_SKIPPED => 'file unreadable or does not exist',
self::ZIP_WARNING_FILTERED => 'file filtered',
self::ZIP_WARNING_LONGPATH => 'filename path too long',
self::ZIP_WARNING_IGNORED_SYMLINK => 'file is a symlink and is ignored based on settings',
);
public static $_other_desc = array( self::ZIP_OTHER_UNKNOWN => 'other reason unknown',
self::ZIP_OTHER_GENERIC => 'other problem as indicated',
self::ZIP_OTHER_SKIPPED => 'file unreadable or does not exist',
self::ZIP_OTHER_FILTERED => 'file filtered',
self::ZIP_OTHER_LONGPATH => 'filename path too long',
self::ZIP_OTHER_IGNORED_SYMLINK => 'file is a symlink and is ignored based on settings',
);
/**
* The Server API that is in use
*
* @var string
*/
protected $_sapi_name = "";
/**
* __construct()
*
* Default constructor.
*
* @return null
*
*/
public function __construct() {
// Make sure we know what we are running on for later
$this->set_os_type();
// Derive whether we are ignoring Warnings or not (expected to be overridden by user)
$this->set_ignore_warnings();
// Derive whether we are ignoring/not-following symlinks or not (expected to be overridden by user)
$this->set_ignore_symlinks();
// Derive whether compression should be used (expected to be overridden by user)
$this->set_compression();
// Specific method constructor will override some of these and the tests may override others
$this->_method_details[ 'attr' ] = array( 'name' => 'Unknown Method',
'compatibility' => false ,
'is_checker' => false,
'is_lister' => false,
'is_archiver' => false,
'is_unarchiver' => false,
'is_commenter' => false,
'is_zipper' => false,
'is_unzipper' => false,
'is_extractor' => false
);
// Must _not_ default 'path' values because we test whether set or not to decide whether to use
$this->_method_details[ 'param' ] = array( // 'path' => '',
'zip' => array( // 'path' => '',
'version' => array( 'major' => 0, 'minor' => 0 ),
'options' => '',
'info' => '' ),
'unzip' => array( // 'path' => '',
'version' => array( 'major' => 0, 'minor' => 0 ),
'options' => '',
'info' => '' )
);
}
/**
* __destruct()
*
* Default destructor.
*
* @return null
*
*/
public function __destruct( ) {
}
/**
* set_os_type()
*
* Sets the identifier for the OS type that we are running on that can then be used for
* OS specific processing. If no enumerated type value is passed in then deduce the
* value to set from system information.
* Note: Currently uses PHP_OS which strictly speaking is the OS that PHP was built on
* whereas php_uname() could be used to determine the actual OS being run on if we really
* need that (and sometimes it has to revert back to just returning the PHP_OS value if
* the OS uname library doesn't exist or isn't working properly.
*
* @param $os_type int OS type to set (can be used to override deduced type)
*
*/
public function set_os_type( $os_type = PHP_INT_MAX ) {
// Check if we have been given a valid enumerated value
if ( ( self::OS_TYPE_UNKNOWN < $os_type ) && ( self::OS_TYPE_MAX >= $os_type ) ) {
$this->_os_type = $os_type;
} else {
// Use UC for ease - this _should not? cause any ambiguity
$os_name = strtoupper( PHP_OS );
// Currently we'll assume anything that doesn't look like Windows is *nix based
if ( substr( $os_name, 0, 3 ) === 'WIN') {
$this->_os_type = self::OS_TYPE_WIN;
} else {
$this->_os_type = self::OS_TYPE_NIX;
}
}
return $this;
}
/**
* get_os_type()
*
* Gets the enumerated identifier for the OS type that we are running on
*
* @return int Enumerated OS type value
*
*/
public function get_os_type( ) {
return $this->_os_type;
}
/**
* set_exec_dir_flag()
*
* Checks whether exec_dir is set in PHP environment and sets internal flag
*
* @return bool True is exec_dir is set and not-empty
*
*/
public function set_exec_dir_flag( ) {
$exec_dir = '';
$result = false;
if ( ( false !== ( $exec_dir = ini_get( 'exec_dir' ) ) ) && ( '' != trim( $exec_dir ) ) ) {
$result = true;
} else {
$result = false;
}
$this->_exec_dir_set = $result;
return $this;
}
/**
* get_exec_dir_flag()
*
* Gets the flag indicating the status of exec_dir setting
*
* @return bool Value of $_exec_dir_set
*
*/
public function get_exec_dir_flag() {
return $this->_exec_dir_set;
}
/**
* set_ignore_warnings()
*
* Checks conditions to see if warnings should be ignored when archives are
* being built.
*
* @param bool $ignore False to not ignore warnings, True to force ignore
* @return bool True if conditions indicate warnings should be ignored, false otherwise
*
*/
public function set_ignore_warnings( $ignore = null ) {
$this->_ignore_warnings = ( is_bool( $ignore ) ) ? $ignore : false ;
return $this;
}
/**
* get_ignore_warnings()
*
* Gets the flag indicating whether warnings should be ignored when building archives
*
* @return bool Value of $_ignore_warnings
*
*/
public function get_ignore_warnings() {
return $this->_ignore_warnings;
}
/**
* set_ignore_synlinks()
*
* Checks conditions to see if symlinks should be ignored/not-followed when archives are
* being built.
*
* @param bool $ignore False to not ignore symlinks, True to force ignore
* @return bool True if conditions indicate symlinks should be ignored/not-followed, false otherwise
*
*/
public function set_ignore_symlinks( $ignore = null ) {
$this->_ignore_symlinks = ( is_bool( $ignore ) ) ? $ignore : true ;
return $this;
}
/**
* get_ignore_symlinks()
*
* This returns true if the option to ignore symlinks is set. In this context ignoring
* means not following but the symlink itself is recorded in the backup
*
* @return bool Value of $_ignore_symlinks
*
*/
protected function get_ignore_symlinks() {
return $this->_ignore_symlinks;
}
/**
* set_compression()
*
* Checks conditions to see if compression should be used when building archive.
*
* @param bool $compression False to prohibit compression, True to force compression
* @return bool True if conditions indicate compression should be used, false otherwise
*
*/
public function set_compression( $compression = null ) {
$this->_compression = ( is_bool( $compression ) ) ? $compression : true ;
return $this;
}
/**
* get_compression()
*
* This returns true if the option to use compression is set.
*
* @return bool Value of $_compression
*
*/
protected function get_compression() {
return $this->_compression;
}
/**
* set_sapi_name()
*
* Sets the sapi name to that given or leave empty
*
* @param string $name A sapi name to set (default empty)
* @return object This object
*/
public function set_sapi_name( $sapi_name = "" ) {
$this->_sapi_name = $sapi_name;
return $this;
}
/**
* get_sapi_name()
*
* Returns the previously set sapi name
*
* @return string The stored sapi name
*/
public function get_sapi_name() {
return $this->_sapi_name;
}
/**
* get_status()
*
* Returns the status array
*
* @return array The status array
*
*/
public function get_status() {
return $this->_status;
}
/**
* log_archive_file_stats()
*
* Produced a status log entry for the archive file stats
*
* @param string $file The file to stat and and log
* @return
*
*/
protected function log_archive_file_stats( $file ) {
// Get the file stats so we can log some information
$file_stats = pluginbuddy_stat::stat( $file );
// Only log anything if we got some valid file stats
if ( false !== $file_stats ) {
pb_backupbuddy::status( 'details', sprintf( __( 'Zip Archive file size: %1$s bytes, owned by user:group %2$s:%3$s with permissions %4$s', 'it-l10n-backupbuddy' ), $file_stats[ 'dsize' ], $file_stats[ 'uid' ], $file_stats[ 'gid' ], $file_stats[ 'mode_octal_four' ] ) );
}
}
/**
* get_method_tag()
*
* Returns the (static) method tag
*
* @return string The method tag
*
*/
abstract public function get_method_tag();
/**
* get_is_compatibility_method()
*
* Returns the (static) is_compatibility_method boolean
*
* @return bool
*
*/
abstract public function get_is_compatibility_method();
/**
* get_method_details()
*
* Returns the details array
*
* @return array
*
*/
public function get_method_details() {
return $this->_method_details;
}
/**
* set_method_details()
*
* Sets the internal (settable) details
*
* @param array
* @return null
*
*/
public function set_method_details( array $details, $merge = true ) {
if ( true === $merge ) {
$this->_method_details[ 'attr' ] = array_merge( $this->_method_details[ 'attr' ], $details[ 'attr' ] );
$this->_method_details[ 'param' ] = array_merge( $this->_method_details[ 'param' ], $details[ 'param' ] );
} else {
$this->_method_details = $details;
}
return $this;
}
/**
* get_executable_paths()
*
* Returns the executable_paths array
*
* @return array
*
*/
public function get_executable_paths() {
return $this->_executable_paths;
}
/**
* set_executable_paths()
*
* Sets the executable_paths array so can be used to augment or override the default
*
* @param $paths array Paths to set or merge
* @param $merge bool True (default) if merging paths with current paths
* @param $before bool True (default) if paths to be prepended
* @return null
*
*/
public function set_executable_paths( array $paths, $merge = true, $before = true ) {
if ( true === $merge ) {
if ( true === $before ) {
$this->_executable_paths = array_merge( $paths, $this->_executable_paths );
} else {
$this->_executable_paths = array_merge( $this->_executable_paths, $paths );
}
} else {
$this->_executable_paths = $paths;
}
return $this;
}
/**
* delete_directory_recursive()
*
* Recursively delete a directory and it's content
*
* @param string $directory Directory to delete
* @return bool True if operation fully successful, otherwise false
*
*/
protected function delete_directory_recursive( $directory ) {
// Remove any trailing directory separator so we know where we are
$directory = rtrim( $directory, self::DIRECTORY_SEPARATORS );
// Non-existent directory so pretend we deleted it ok
if ( !file_exists( $directory ) ) {
return true;
}
// Make sure it wasn't just a file or link - if so just delete it and return
if ( !is_dir( $directory ) || is_link( $directory ) ) {
return @unlink( $directory );
}
// So it is a directory so process content
foreach ( scandir( $directory ) as $item ) {
// Skip the this and parent directories
if ( $item == '.' || $item == '..' ) {
continue;
}
// Delete the item if we can
if ( !$this->delete_directory_recursive( $directory . "/" . $item ) ) {
// TODO: Supposedly change the perms on the item so we can delete it?
@chmod( $directory . "/" . $item, 0777 );
if ( !$this->delete_directory_recursive( $directory . "/" . $item ) ) {
return false;
}
}
}
return @rmdir( $directory );
}
/* _render_exclusions_file()
*
* function description
*
* @param string $file File to write exclusions into.
* @param array $exclusions Array of directories/paths to exclude. One per line.
* @return null
*/
protected function _render_exclusions_file( $file, $exclusions ) {
// Array for cleaned up exclusions list
$sanitized_exclusions = array();
pb_backupbuddy::status( 'details', 'Creating backup exclusions file `' . $file . '`.' );
//$exclusions = backupbuddy_core::get_directory_exclusions();
// Test each exclusion for validity (presence) and drop those not actually present
foreach( $exclusions as $exclusion ) {
// Make sure platform specific directory separators are used (could have migrated from different platform)
$exclusion = preg_replace( '|[' . addslashes( self::DIRECTORY_SEPARATORS ) . ']+|', DIRECTORY_SEPARATOR, $exclusion );
// DIRECTORY.
if ( is_dir( ABSPATH . ltrim( $exclusion, DIRECTORY_SEPARATOR ) ) ) {
pb_backupbuddy::status( 'details', 'Excluding directory `' . $exclusion . '`.' );
// Need to add the wildcard so that zip will exclude the directory and content
$exclusion = rtrim( $exclusion, DIRECTORY_SEPARATOR ) . DIRECTORY_SEPARATOR . '*';
// FILE.
} elseif ( is_file( ABSPATH . ltrim( $exclusion, DIRECTORY_SEPARATOR ) ) ) {
pb_backupbuddy::status( 'details', 'Excluding file `' . $exclusion . '`.' );
// SYMBOLIC LINK.
} elseif ( is_link( ABSPATH . ltrim( $exclusion, DIRECTORY_SEPARATOR ) ) ) {
pb_backupbuddy::status( 'details', 'Excluding symbolic link `' . $exclusion . '`.' );
// DOES NOT EXIST.
} else {
pb_backupbuddy::status( 'details', 'Omitting exclusion as file/directory does not currently exist: `' . $exclusion . '`.' );
// Skip to next exclusion
continue;
}
// We have a valid exclude so add it
$sanitized_exclusions[] = $exclusion;
}
// Put the exclusions to a file as a string
file_put_contents( $file, implode( PHP_EOL, $sanitized_exclusions ) . PHP_EOL );
pb_backupbuddy::status( 'details', 'Backup exclusions file created.' );
} // End render_exclusions_file().
/**
* slashify()
*
* A function to add a slash to the end of a path. It is much like the WordPress trailingslashit()
* but allows for not adding a slash to an empty path. Will add a normalized slash unless overridden
* Note: Will not process any embedded directory separators
*
* @param string $path The path to add a trailing slash to
* @param bool $ignore_empty True (default) if should _not_ add a trailing slash to an empty path
* @param bool $use_normalized_slash True (default) to add a normalized slash, otherwise add platform separator
* @return string The path with trailing slash optionally added
*
*/
protected function slashify( $path, $ignore_empty = true, $use_normalized_slash = true ) {
// Check if it is empty now before we may remove a single slash
if ( ! ( empty( $path ) && ( true === $ignore_empty ) ) ) {
// First remove any trailing slash that may be present
$path = $this->unslashify( $path );
if ( true === $use_normalized_slash ) {
$path = $path . self::NORM_DIRECTORY_SEPARATOR;
} else {
$path = $path . DIRECTORY_SEPARATOR;
}
}
return $path;
}
/**
* unslashify()
*
* A function to remove a slash to the end of a path. It is much like the WordPress untrailingslashit()
* but copes with either form of trailing slash.
* Note: Will not process any embedded directory separators and may produce an empty path.
*
* @param string $path The path to remove a trailing slash from
* @param bool $ignore_empty True (default) if should proceed even if will produce an empty path
* @return string The path with trailing slash removed
*
*/
protected function unslashify( $path, $ignore_empty = true ) {
// Create a candidate path to optionally return
$candidate_path = rtrim( $path, self::DIRECTORY_SEPARATORS );
// If candidate isn't empty or we're ignoring it being empty anyway
if ( !empty( $candidate_path ) || ( true === $ignore_empty ) ) {
$path = $candidate_path;
}
return $path;
}
/**
* log_zip_reports()
*
* A function to process reports parsed from the zip process output and log them and optionally
* send to a file if there are a lot of reports. If the number of reports is such that they require
* to be written to a file then all the reports will be written to the file, not just the overflow.
. *
* @param array $reports_log array containing the type of reports to log
* @param array $reports_desc array containing text description of report reason
* @param string $report_prefix a prefix string to go before the report text
* @param integer $report_lines_to_show the number of reports to show in log before overflowing to a file
* @param string $report_file overflow file if too many reports to show directly in log
* @return N/A Currently no return parameter
*
*/
protected function log_zip_reports( $reports_log, $report_desc, $report_prefix, $report_lines_to_show, $reports_file ) {
$reports = array();
$reports_count = 0;
$result = false;
// Make sure we clear up ant previous reports file that may still be present
if ( @file_exists( $reports_file ) ) {
@unlink( $reports_file );
}
// Parse the reports array into an ordered array based on id (log line number) as sort key
foreach ( $reports_log as $reason => $report ) {
foreach ( $report as $id => $filename ) {
$reports[ $id ] = sprintf( __( '%1$s: (%2$s): %3$s' . PHP_EOL,'it-l10n-backupbuddy' ), $report_prefix, $report_desc[ $reason ], $filename );
}
}
// Make sure array is now ordered by the numeric log line number key
$result = ksort( $reports, SORT_NUMERIC );
// Always show the first number of lines in the log
$show_lines = array_slice( $reports, 0, $report_lines_to_show, true );
foreach ( $show_lines as $line ) {
pb_backupbuddy::status( 'details', __( 'Zip process reported: ','it-l10n-backupbuddy' ) . $line );
}
// If there were more lines then output the whole to the report file
$reports_count = sizeof( $reports );
if ( $reports_count > $report_lines_to_show ) {
@file_put_contents( $reports_file, $reports );
if ( @file_exists( $reports_file ) ) {
pb_backupbuddy::status( 'details', sprintf( __( 'Zip process reported %1$s more %2$s report%3$s - please review in: %4$s','it-l10n-backupbuddy' ), ( $reports_count - $report_lines_to_show ), $report_prefix, ( ( 1 == $reports_count ) ? '' : 's' ), $reports_file ) );
}
}
}
/**
* is_available()
*
* A function that tests for the availability of the specific method and its available modes. Will test for
* multiple modes (zip & unzip) and only return false if neither is available. Actual available modes will
* be indicated in the method attributes.
*
* @param string $tempdir Temporary directory to use for any test files (must be writeable)
* @return bool True if the method is available for at least one mode, false otherwise
*
*/
abstract public function is_available( $tempdir );
/**
* create()
*
* A function that creates an archive file
*
* The $excludes will be a list or relative path excludes if the $listmaker object is NULL otherwise
* will be absolute path excludes and relative path excludes can be had from the $listmaker object
*
* @param string $zip Full path & filename of ZIP Archive file to create
* @param string $dir Full path of directory to add to ZIP Archive file
* @parame array $excludes List of either absolute path exclusions or relative exclusions
* @param string $tempdir Full path of directory for temporary usage
* @param object $listmaker The object from which we can get an inclusions list
* @return bool True if the creation was successful, false otherwise
*
*/
abstract public function create( $zip, $dir, $excludes, $tempdir, $listmaker = NULL );
/**
* extract()
*
* Extracts the contents of a zip file to the specified directory using the best unzip methods possible.
*
* @param string $zip_file Full path & filename of ZIP file to extract from.
* @param string $destination_directory Full directory path to extract into.
* @param array $items Mapping of what to extract and to what
* @return bool true on success (all extractions successful), false otherwise
*/
abstract public function extract( $zip_file, $destination_directory = '', $items = array() );
/**
* file_exists()
*
* Tests whether a file (with path) exists in the given zip file
* If leave_open is true then the zip object will be left open for faster checking for subsequent files within this zip
*
* @param string $zip_file The zip file to check
* @param string $locate_file The file to test for
* @param bool $leave_open Optional: True if the zip file should be left open
* @return bool True if the file is found in the zip otherwise false
*
*/
abstract public function file_exists( $zip_file, $locate_file, $leave_open = false );
/* get_file_list()
*
* Get an array of all files in a zip file with some file properties.
*
* @param string $zip_file The file to list the content of
* @return bool|array false on failure, otherwise array of file properties (may be empty)
*/
abstract public function get_file_list( $zip_file );
/* set_comment()
*
* Retrieve archive comment.
*
* @param string $zip_file Filename of archive to set comment on.
* @param string $comment Comment to apply to archive.
* @return bool true on success, otherwise false.
*/
abstract public function set_comment( $zip_file, $comment );
/* get_comment()
*
* Retrieve archive comment.
*
* @param string $zip_file Filename of archive to retrieve comment from.
* @return bool|string false on failure, Zip comment otherwise.
*/
abstract public function get_comment( $zip_file );
} // end pluginbuddy_zbzipcore class.
}
?>