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<?php
/**
* File containing the abstract ezcArchive class.
*
* @package Archive
* @version 1.4.1
* @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* The ezcArchive class provides the common interface for reading and writing
* the archive formats Tar and Zip.
*
* ezcArchive provides the main API for reading and writing to an archive. The
* archive itself can be compressed with GZip or BZip2 and will be handled
* transparently.
*
* The {@link open()} method creates a new archive instance. For
* existing archives, ezcArchive determines the correct archive format by the
* mime-type and returns an instance of a subclass handling this format.
* New archives should force a format type via a parameter in the open()
* method.
*
* The instance of an ezcArchive class is also an iterator, which
* points to the first file in the archive by default. Moving this pointer can
* be done via the iterator methods: {@link rewind()}, {@link next()},
* {@link valid()}, {@link key()}, and {@link current()}. This iterator is
* defined as an object iterator and allows, for example, the {@link
* http://www.php.net/foreach foreach} statement to iterate through the files.
*
* Extra methods that operate on the current iterator are: {@link
* extractCurrent()} and {@link appendToCurrent()}. Which can be used,
* respectively, to extract the files and to append a new file to the archive.
* To append a directory to an archive you need to add a slash '/' at the end
* of the directory name.
*
* The following example will open an existing tar.gz file and will append each
* file to a zip archive:
* <code>
* $tar = ezcArchive::open( "/tmp/archive.tar.gz" );
* $newZip = ezcArchive::open( "/tmp/new_archive.zip", ezcArchive::ZIP );
*
* foreach ( $tar as $entry )
* {
* // $entry contains the information of the current entry in the archive.
* $tar->extractCurrent( "/tmp/" );
* $newZip->appendToCurrent( $entry->getPath(), "/tmp/" );
* $newZip->next();
* }
* </code>
*
* In order to extract an entire archive at once, use the {@link extract()}
* method.
*
* @package Archive
* @version 1.4.1
* @mainclass
*/
abstract class ezcArchive implements Iterator
{
/**
* Normal tar archive.
*/
const TAR = 0;
/**
* Tar version 7 archive.
*/
const TAR_V7 = 1;
/**
* USTAR tar archive.
*/
const TAR_USTAR = 2;
/**
* PAX tar archive.
*/
const TAR_PAX = 3;
/**
* GNU tar archive.
*/
const TAR_GNU = 4;
/**
* ZIP archive.
*/
const ZIP = 10;
/**
* Gnu ZIP compression format.
*/
const GZIP = 20;
/**
* BZIP2 compression format.
*/
const BZIP2 = 30;
/**
* The entry or file number to which the iterator points.
*
* The first $fileNumber starts with 0.
*
* @var int
*/
protected $fileNumber = 0;
/**
* The number of entries currently read from the archive.
*
* @var int
*/
protected $entriesRead = 0;
/**
* Is true when the archive is read until the end, otherwise false.
*
* @var bool
*/
protected $completed = false;
/**
* Stores the entries read from the archive.
*
* The array is not complete when the {@link $completed} variable is set to
* false. The array may be over-complete, so the {@link $entriesRead}
* should be checked if the {@link $completed} variable is set to true.
*
* @var array(ezcArchiveEntry)
*/
protected $entries;
/**
* Direct access to the archive file.
*
* @var ezcArchiveFile
*/
protected $file = null;
/**
* Holds the options if passed to the open method.
*
* @var ezcArchiveOptions
*/
protected $options;
/**
* Use the {@link open()} method to get an instance of this class.
*/
private function __construct()
{
}
/**
* Returns a new ezcArchive instance.
*
* This method returns a new instance according to the mime-type or
* the given $forceType.
*
* - If $forceType is set to null, this method will try to determine the
* archive format via the file data. Therefore the $forceType can only be
* null when the archive contains data.
* - If $forceType is set, it will use the specified algorithm. Even when
* the given archive is from another type than specified.
*
* @throws ezcArchiveUnknownTypeException if the type of the archive cannot be determined.
*
* @param string $archiveName Absolute or relative path to the archive.
* @param int $forceType Open the archive with the $forceType
* algorithm. Possible values are: {@link ezcArchive::ZIP},
* {@link ezcArchive::TAR}, {@link ezcArchive::TAR_V7}, {@link ezcArchive::TAR_USTAR},
* {@link ezcArchive::TAR_PAX}, {@link ezcArchive::TAR_GNU}.
* TAR will use the TAR_USTAR algorithm by default.
* @param ezcArchiveOptions $options
*
* @return ezcArchive
*/
public static function open( $archiveName, $forceType = null, ezcArchiveOptions $options = null )
{
$options = self::initOptions( $options );
if ( !ezcArchiveFile::fileExists( $archiveName ) && $forceType === null )
{
throw new ezcArchiveUnknownTypeException( $archiveName );
}
if ( $forceType !== null )
{
return self::createInstance( $archiveName, $forceType, $options );
}
$h = ezcArchiveFileType::detect( $archiveName );
while ( $h == ezcArchive::GZIP || $h == ezcArchive::BZIP2 )
{
if ( $h == ezcArchive::GZIP )
{
$archiveName = "compress.zlib://$archiveName";
$h = ezcArchiveFileType::detect( $archiveName );
}
if ( $h == ezcArchive::BZIP2 )
{
$archiveName = "compress.bzip2://$archiveName";
$h = ezcArchiveFileType::detect( $archiveName );
}
}
return self::createInstance( $archiveName, $h, $options );
}
/**
* Close the current archive.
*/
public function close()
{
}
/**
* Sets the property $name to $value.
*
* Because there are no properties available, this method will always
* throw an {@link ezcBasePropertyNotFoundException}.
*
* @throws ezcBasePropertyNotFoundException if the property does not exist.
* @param string $name
* @param mixed $value
* @ignore
*/
public function __set( $name, $value )
{
throw new ezcBasePropertyNotFoundException( $name );
}
/**
* Returns the property $name.
*
* Because there are no properties available, this method will always
* throw an {@link ezcBasePropertyNotFoundException}.
*
* @throws ezcBasePropertyNotFoundException if the property does not exist.
* @param string $name
* @ignore
*/
public function __get( $name )
{
throw new ezcBasePropertyNotFoundException( $name );
}
/**
* Returns the algorithm that is used currently.
*
* @return int Possible values are: {@link ezcArchive::ZIP}, {@link ezcArchive::TAR}, {@link ezcArchive::TAR_V7},
* {@link ezcArchive::TAR_USTAR}, {@link ezcArchive::TAR_PAX}, or {@link ezcArchive::TAR_GNU}.
*/
public abstract function getAlgorithm();
/**
* Returns true if writing to the archive is implemented, otherwise false.
*
* @see isWritable()
*
* @return bool
*/
public abstract function algorithmCanWrite();
/**
* Returns an instance of the archive with the given type.
*
* Similar to {@link open()}, but the type is required.
*
* @param string $archiveName The path of the archive.
* @param int $type Open the archive with the $forceType
* algorithm. Possible values are: {@link ezcArchive::ZIP},
* {@link ezcArchive::TAR}, {@link ezcArchive::TAR_V7}, {@link ezcArchive::TAR_USTAR},
* {@link ezcArchive::TAR_PAX}, {@link ezcArchive::TAR_GNU}.
* TAR will use the TAR_USTAR algorithm by default.
*
* @return ezcArchive Subclass of ezcArchive: {@link ezcArchiveZip},
* {@link ezcArchiveV7Tar}, {@link ezcArchivePax},
* {@link ezcArchiveGnuTar}, or {@link ezcArchiveUstar}.
*/
protected static function createInstance( $archiveName, $type, ezcArchiveOptions $options = null )
{
$options = self::initOptions( $options );
if ( $type == self::ZIP )
{
$af = new ezcArchiveCharacterFile( $archiveName, true, $options->readOnly );
return self::getZipInstance( $af );
}
$af = new ezcArchiveBlockFile( $archiveName, true, 512, $options->readOnly );
$instance = self::getTarInstance( $af, $type );
$instance->options = $options;
return $instance;
}
/**
* This methods initializes the options by generating an options object if $options is null.
*
* @param null|ezcArchiveOptions $options
*
* @return ezcArchiveOptions
*/
private static function initOptions( $options )
{
if ( $options === null )
{
$options = new ezcArchiveOptions;
}
return $options;
}
/**
* This method associates a new $options object with this archive.
*
* @param ezcArchiveOptions $options
*/
public function setOptions( ezcArchiveOptions $options )
{
$this->options = $options;
}
/**
* Open a tar instance.
*
* This method is made public for testing purposes, and should not be used.
*
* @param ezcArchiveBlockFile $blockFile
* @param int $type
* The algorithm type. Possible values are:
* {@link ezcArchive::TAR}, {@link ezcArchive::TAR_V7}, {@link ezcArchive::TAR_USTAR},
* {@link ezcArchive::TAR_PAX}, {@link ezcArchive::TAR_GNU}.
* TAR will use the TAR_USTAR algorithm by default.
*
* @return ezcArchive Subclass of ezcArchive:
* {@link ezcArchiveV7Tar}, {@link ezcArchivePax},
* {@link ezcArchiveGnuTar}, or {@link ezcArchiveUstar}.
* @access private
*/
public static function getTarInstance( ezcArchiveBlockFile $blockFile, $type )
{
switch ( $type )
{
case self::TAR_V7:
return new ezcArchiveV7Tar( $blockFile );
case self::TAR_USTAR:
return new ezcArchiveUstarTar( $blockFile );
case self::TAR_PAX:
return new ezcArchivePaxTar( $blockFile );
case self::TAR_GNU:
return new ezcArchiveGnuTar( $blockFile );
case self::TAR:
return new ezcArchiveUstarTar( $blockFile ); // Default type.
}
return null;
}
/**
* Open a zip instance. This method is made public for testing purposes, and
* should not be used.
*
* @param ezcArchiveCharacterFile $charFile The character file which
* contains the archive.
* @return ezcArchive Subclass of ezcArchive: {@link ezcArchiveZip}.
* @access private
*/
public static function getZipInstance( ezcArchiveCharacterFile $charFile )
{
return new ezcArchiveZip( $charFile );
}
/**
* Returns true if the iterator points to a valid entry, otherwise false.
*
* @return bool
*/
public function valid()
{
return ( $this->fileNumber >= 0 && $this->fileNumber < $this->entriesRead );
}
/**
* Rewinds the iterator to the first entry.
*
* @return void
*/
public function rewind()
{
$this->fileNumber = 0;
}
/**
* Returns the current ezcArchiveEntry if it is valid, otherwise false is returned.
*
* @return ezcArchiveEntry
*/
public function current()
{
return ( $this->valid() ? $this->entries[$this->fileNumber] : false );
}
/**
* Returns the current key, entry number, if it is valid, otherwise false is returned.
*
* @return int
*/
public function key()
{
return ( $this->valid() ? $this->fileNumber : false );
}
/**
* Forwards the iterator to the next entry.
*
* If there is no next entry all iterator methods except for {@link
* rewind()} will return false.
*
* @see rewind()
*
* @return ezcArchiveEntry The next entry if it exists, otherwise false.
*/
public function next()
{
if ( $this->valid() )
{
$this->fileNumber++;
if ( $this->valid() )
{
return $this->current();
}
if ( !$this->completed )
{
if ( $this->readCurrentFromArchive() )
{
return $this->current();
}
}
}
return false;
}
/**
* Extract the current entry to which the iterator points.
*
* Extract the current entry to which the iterator points, and return true if the current entry is extracted.
* If the iterator doesn't point to a valid entry, this method returns false.
*
* True if the file is extracted correctly, otherwise false.
*
* @param string $target
* The full path to which the target should be extracted.
* @param bool $keepExisting
* True if the file shouldn't be overwritten if they already exist.
* For the opposite behaviour, false should be given.
*
* @throws ezcArchiveValueException if the archive contains invalid values.
* @throws ezcBaseFileNotFoundException if the link cannot be found.
*
* @return bool
*/
public function extractCurrent( $target, $keepExisting = false )
{
if ( $this->file === null )
{
throw new ezcArchiveException( "The archive is closed" );
}
if ( !$this->valid() )
{
return false;
}
$isWindows = ( substr( php_uname( 's' ), 0, 7 ) == 'Windows' ) ? true : false;
$entry = $this->current();
$type = $entry->getType();
$fileName = $target . DIRECTORY_SEPARATOR. $entry->getPath();
if ( $type == ezcArchiveEntry::IS_LINK )
{
$linkName = $target . DIRECTORY_SEPARATOR . $entry->getLink();
if ( !file_exists( $linkName ) )
{
throw new ezcBaseFileNotFoundException( $linkName, "link", "Hard link could not be created." );
}
}
$this->createDefaultDirectory( $fileName );
if ( !$keepExisting || ( !is_link( $fileName ) && !file_exists( $fileName ) ) )
{
if ( ( file_exists( $fileName ) || is_link( $fileName ) ) && !is_dir( $fileName ) )
{
unlink ( $fileName );
}
if ( !file_exists( $fileName ) ) // For example, directories are not removed.
{
switch ( $type )
{
case ezcArchiveEntry::IS_CHARACTER_DEVICE:
if ( ezcBaseFeatures::hasFunction( 'posix_mknod' ) )
{
posix_mknod( $fileName, POSIX_S_IFCHR, $entry->getMajor(), $entry->getMinor() );
}
else
{
throw new ezcArchiveValueException( $type );
}
break;
case ezcArchiveEntry::IS_BLOCK_DEVICE:
if ( ezcBaseFeatures::hasFunction( 'posix_mknod' ) )
{
posix_mknod( $fileName, POSIX_S_IFBLK, $entry->getMajor(), $entry->getMinor() );
}
else
{
throw new ezcArchiveValueException( $type );
}
break;
case ezcArchiveEntry::IS_FIFO:
if ( ezcBaseFeatures::hasFunction( 'posix_mknod' ) )
{
posix_mknod( $fileName, POSIX_S_IFIFO );
}
else
{
throw new ezcArchiveValueException( $type );
}
break;
case ezcArchiveEntry::IS_SYMBOLIC_LINK:
if ( $isWindows )
{
// FIXME.. need to be sure that target file
// already extracted before copying it to link destination.
$sourcePath = dirname( $fileName ) . '/' . $entry->getLink();
$fileName = str_replace( '/', '\\', $fileName );
copy( $sourcePath, $fileName );
}
else
{
symlink( $entry->getLink(), $fileName );
}
break;
case ezcArchiveEntry::IS_LINK:
if ( $isWindows )
{
copy( $target . DIRECTORY_SEPARATOR . $entry->getLink(), $fileName );
}
else
{
link( $target . DIRECTORY_SEPARATOR . $entry->getLink(), $fileName );
}
break;
case ezcArchiveEntry::IS_DIRECTORY:
$permissions = $entry->getPermissions();
if ( $permissions === null || $permissions === false )
{
$permissions = '0777';
}
mkdir( $fileName, octdec( $permissions ), true );
break;
case ezcArchiveEntry::IS_FILE:
$this->writeCurrentDataToFile( $fileName );
break;
default:
throw new ezcArchiveValueException( $type );
}
if ( $type == ezcArchiveEntry::IS_SYMBOLIC_LINK &&
ezcBaseFeatures::hasFunction( 'posix_geteuid' ) &&
posix_geteuid() == 0 )
{
$user = $entry->getUserId();
$group = $entry->getGroupId();
@lchown( $fileName, $user );
@lchgrp( $fileName, $group );
}
// Change the username and group if the filename exists and if
// the intention is to keep it as a file. A zip archive
// stores the symlinks in a file; thus don't change these.
if ( file_exists( $fileName ) && ( $type == ezcArchiveEntry::IS_FILE || $type == ezcArchiveEntry::IS_DIRECTORY ) )
{
$group = $entry->getGroupId();
$user = $entry->getUserId();
$time = $entry->getModificationTime();
$perms = octdec( $entry->getPermissions() );
if ( $this->options && $this->options->extractCallback )
{
$this->options->extractCallback->{$type == ezcArchiveEntry::IS_DIRECTORY ? 'createDirectoryCallback' : 'createFileCallback'}( $fileName, $perms, $user, $group );
}
if ( ezcBaseFeatures::hasFunction( 'posix_geteuid' ) &&
posix_geteuid() === 0 )
{
@chgrp( $fileName, $group );
@chown( $fileName, $user );
}
if ( $perms != false )
{
chmod( $fileName, $perms );
}
touch( $fileName, $time );
}
}
return true;
}
return false;
}
/**
* Search for the entry number.
*
* The two parameters here are the same as the PHP {@link http://www.php.net/fseek fseek()} method.
* The internal iterator position will be set by $offset added to $whence iterations forward.
* Where $whence is:
* - SEEK_SET, Set the position equal to $offset.
* - SEEK_CUR, Set the current position plus $offset.
* - SEEK_END, Set the last file in archive position plus $offset.
*
* This method returns true if the new position is valid, otherwise false.
*
* @throws ezcArchiveException
* if the archive is closed
* @param int $offset
* @param int $whence
* @return bool
*/
public function seek( $offset, $whence = SEEK_SET )
{
if ( $this->file === null )
{
throw new ezcArchiveException( "The archive is closed" );
}
// Cannot trust the current position if the current position is invalid.
if ( $whence == SEEK_CUR && $this->valid() == false )
{
return false;
}
if ( $whence == SEEK_END && !$this->completed )
{
// read the entire archive.
$this->fileNumber = $this->entriesRead;
while ( $this->readCurrentFromArchive() )
{
$this->fileNumber++;
}
}
switch ( $whence )
{
case SEEK_SET:
$requestedFileNumber = $offset;
break;
case SEEK_CUR:
$requestedFileNumber = $offset + $this->fileNumber;
break;
case SEEK_END:
$requestedFileNumber = $offset + $this->entriesRead - 1;
break;
default:
return false; // Invalid whence.
}
$this->fileNumber = $requestedFileNumber;
if ( $this->valid() )
{
return true;
}
if ( !$this->completed )
{
$this->fileNumber = $this->entriesRead - 1;
while ( $this->fileNumber != $requestedFileNumber )
{
$this->fileNumber++;
if ( !$this->readCurrentFromArchive() )
{
break;
}
}
return $this->valid();
}
return false;
}
/**
* Creates all the directories needed to create the file $file.
*
* @param string $file Path to a file, where all the base directory names will be created.
*/
protected function createDefaultDirectory( $file )
{
// Does the directory exist?
$dirName = dirname( $file );
if ( !file_exists( $dirName ) )
{
// Try to create the directory.
if ( substr( php_uname( 's' ), 0, 7 ) == 'Windows' )
{
// make all slashes to be '/'
$dirName = str_replace( '/', '\\', $dirName );
}
// Call the callback, to see whether we need to change permissions
$permissions = 0777;
$dummy = null;
if ( $this->options && $this->options->extractCallback )
{
$this->options->extractCallback->createDirectoryCallback( $dirName, $permissions, $dummy, $dummy );
}
mkdir( $dirName, $permissions, true );
}
}
/**
* Appends a file to the archive after the current entry.
*
* One or multiple files can be added directly after the current file.
* The remaining entries after the current are removed from the archive!
*
* The $files can either be a string or an array of strings. Which, respectively, represents a
* single file or multiple files.
*
* $prefix specifies the begin part of the $files path that should not be included in the archive.
* The files in the archive are always stored relatively.
*
* Example:
* <code>
* $tar = ezcArchive( "/tmp/my_archive.tar", ezcArchive::TAR );
*
* // Append two files to the end of the archive.
* $tar->seek( 0, SEEK_END );
* $tar->appendToCurrent( array( "/home/rb/file1.txt", "/home/rb/file2.txt" ), "/home/rb/" );
* </code>
*
* When multiple files are added to the archive at the same time, thus using an array, does not
* necessarily produce the same archive as repeatively adding one file to the archive.
* For example, the Tar archive format, can detect that files hardlink to each other and will store
* it in a more efficient way.
*
* @throws ezcArchiveWriteException if one of the files cannot be written to the archive.
* @throws ezcFileReadException if one of the files cannot be read from the local filesystem.
*
* @param string|array(string) $files Array or a single path to a file.
* @param string $prefix First part of the path used in $files.
* @return bool
*/
public abstract function appendToCurrent( $files, $prefix );
/**
* Appends a file or directory to the end of the archive. Multiple files or directory can
* be added to the archive when an array is used as input parameter.
*
* @see appendToCurrent()
*
* @throws ezcArchiveWriteException if one of the files cannot be written to the archive.
* @throws ezcFileReadException if one of the files cannot be read from the local filesystem.
*
* @param string|array(string) $files Array or a single path to a file.
* @param string $prefix First part of the path used in $files.
* @return bool
*/
public abstract function append( $files, $prefix );
/**
* Truncates the archive to $fileNumber of files.
*
* The $fileNumber parameter specifies the amount of files that should remain.
* If the default value, zero, is used then the entire archive file is cleared.
*
* @param int $fileNumber
* @return bool
*/
public abstract function truncate( $fileNumber = 0 );
/**
* Writes the file data from the current entry to the given file.
*
* @param string $targetPath The absolute or relative path of the target file.
* @return void
*/
protected abstract function writeCurrentDataToFile( $targetPath );
/**
* Returns an array that lists the content of the archive.
*
* Use the getArchiveEntry method to get more information about an entry.
*
* @see __toString()
*
* @throws ezcArchiveException
* if the archive is closed
* @return array(string)
*/
public function getListing()
{
if ( $this->file === null )
{
throw new ezcArchiveException( "The archive is closed" );
}
$result = array();
$this->rewind();
do
{
$entry = $this->current();
$result[] = rtrim( $entry->__toString(), "\n" ); // remove newline.
} while ( $this->next() );
return $result;
}
/**
* Returns a string which represents all the entries from the archive.
*
* @throws ezcArchiveException
* if the archive is closed
* @return string
*/
public function __toString()
{
if ( $this->file === null )
{
throw new ezcArchiveException( "The archive is closed" );
}
$result = "";
$this->rewind();
while ( $this->valid() )
{
$result .= $this->current()->__toString() . "\n";
$this->next();
}
return $result;
}
/**
* Extract entries from the archive to the target directory.
*
* All entries from the archive are extracted to the target directory.
* By default the files in the target directory are overwritten.
* If the $keepExisting is set to true, the files from the archive will not overwrite existing files.
*
* @see extractCurrent()
*
* @throws ezcArchiveException
* if the archive is closed
* @throws ezcArchiveEmptyException
* if the archive is invalid
* @param string $target Absolute or relative path of the directory.
* @param bool $keepExisting If set to true then the file will be overwritten, otherwise not.
* @return void
*/
public function extract( $target, $keepExisting = false )
{
if ( $this->file === null )
{
throw new ezcArchiveException( "The archive is closed" );
}
$this->rewind();
if ( !$this->valid() )
{
throw new ezcArchiveEmptyException( );
}
while ( $this->valid() )
{
$this->extractCurrent( $target, $keepExisting );
$this->next();
}
}
/**
* Returns true if the current archive is empty, otherwise false.
*
* @return bool
*/
public function isEmpty()
{
return ( $this->entriesRead == 0 );
}
/**
* Get the file entries from the archive.
*
* @param string|array(string) $files Array or a single path to a file.
* @param string $prefix First part of the path used in $files.
*
* @return ezcArchiveEntry
*/
protected function getEntries( $files, $prefix )
{
if ( !is_array( $files ) )
{
$files = array( $files );
}
// Check whether the files are correct.
foreach ( $files as $file )
{
if ( !file_exists( $file ) && !is_link( $file ) )
{
throw new ezcBaseFileNotFoundException( $file );
}
}
// Search for all the entries, because otherwise hardlinked files show up as an ordinary file.
return ezcArchiveEntry::getEntryFromFile( $files, $prefix );
}
}
?>