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<?php
/**
* File containing the ezcArchiveUstarHeader 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
* @access private
*/
/**
* The ezcArchiveUstarHeader class represents the Tar Ustar header.
*
* ezcArchiveUstarHeader can read the header from an ezcArchiveBlockFile or ezcArchiveEntry.
*
* The values from the headers are directly accessible via the class properties, and allows
* reading and writing to specific header values.
*
* The entire header can be appended to an ezcArchiveBlockFile again or written to an ezcArchiveFileStructure.
* Information may get lost, though.
*
* The Ustar Header has the following structure:
*
* <pre>
* +--------+------------+-------------------+---------------------------+
* | Offset | Field size | Property | Description |
* +--------+------------+-------------------+---------------------------+
* | 0 | 100 | fileName | Name of the file |
* | 100 | 8 | fileMode | File mode |
* | 108 | 8 | userId | Owner user ID |
* | 116 | 8 | groupId | Owner group ID |
* | 124 | 12 | fileSize | Length of file in bytes |
* | 136 | 12 | modificationTime | Modify time of file |
* | 148 | 8 | checksum | Checksum for header |
* | 156 | 1 | type | Indicator for links |
* | 157 | 100 | linkName | Name of linked file |
* | 257 | 6 | magic | USTAR indicator |
* | 263 | 2 | version | USTAR version |
* | 265 | 32 | userName | Owner user name |
* | 297 | 32 | groupName | Owner group name |
* | 329 | 8 | deviceMajorNumber | Major device number |
* | 337 | 8 | deviceMinorNumber | Minor device number |
* | 345 | 155 | filePrefix | Filename prefix |
* | 500 | 12 | - | NUL |
* +--------+------------+-------------------+---------------------------+
* </pre>
*
* The columns of the table are:
* - Offset describes the start position of a header field.
* - Field size describes the size of the field.
* - Property is the name of the property that will be set by the header field.
* - Description explains what this field describes.
*
*
* @package Archive
* @version 1.4.1
* @access private
*/
class ezcArchiveUstarHeader extends ezcArchiveV7Header
{
/**
* Sets the property $name to $value.
*
* @throws ezcBasePropertyNotFoundException if the property does not exist.
* @param string $name
* @param mixed $value
* @return void
* @ignore
*/
public function __set( $name, $value )
{
switch ( $name )
{
case "magic":
case "version":
case "userName":
case "groupName":
case "deviceMajorNumber":
case "deviceMinorNumber":
case "filePrefix":
$this->properties[$name] = $value;
return;
}
return parent::__set( $name, $value );
}
/**
* Returns the value of the property $name.
*
* @throws ezcBasePropertyNotFoundException if the property does not exist.
* @param string $name
* @return mixed
* @ignore
*/
public function __get( $name )
{
switch ( $name )
{
case "magic":
case "version":
case "userName":
case "groupName":
case "deviceMajorNumber":
case "deviceMinorNumber":
case "filePrefix":
return $this->properties[ $name ];
}
return parent::__get( $name );
}
/**
* Creates and initializes a new header.
*
* If the ezcArchiveBlockFile $file is null then the header will be empty.
* When an ezcArchiveBlockFile is given, the block position should point to the header block.
* This header block will be read from the file and initialized in this class.
*
* @param ezcArchiveBlockFile $file
*/
public function __construct( ezcArchiveBlockFile $file = null )
{
// Offset | Field size | Description
// ----------------------------------
// 0 | 100 | Name of file
// 100 | 8 | File mode
// 108 | 8 | Owner user ID
// 116 | 8 | Owner group ID
// 124 | 12 | Length of file in bytes
// 136 | 12 | Modify time of file
// 148 | 8 | Checksum for header
// 156 | 1 | Type flag.
// 157 | 100 | Name of linked file
// 257 | 6 | USTAR indicator.
// 263 | 2 | USTAR version.
// 265 | 32 | Owner user name.
// 297 | 32 | Owner group name.
// 329 | 8 | Major device number.
// 337 | 8 | Minor device number.
// 345 | 155 | Filename prefix.
// 500 | 12 | NUL.
if ( !is_null( $file ) )
{
parent::__construct( $file );
// Decode the rest.
$decoded = unpack( "@257/a6magic/a2version/a32userName/a32groupName/a8deviceMajorNumber/a8deviceMinorNumber/a155filePrefix", $file->current() );
// Append the decoded array to the header.
$this->properties = array_merge( $this->properties, $decoded );
$this->handleOwner();
}
}
/**
* This method sets the correct owner in the headers.
*
* This only works if PHP has the posix extension compiled in and
* when the effective user ID is 0 (root).
*/
protected function handleOwner()
{
if ( !ezcBaseFeatures::hasFunction( 'posix_getpwuid' ) )
{
return;
}
$t =& $this->properties;
if ( posix_geteuid() === 0 && isset( $t['userName'] ) && $t['userName'] !== '' )
{
if ( ( $userName = posix_getpwnam( $t['userName'] ) ) !== false )
{
$t['userId'] = $userName['uid'];
}
if ( ( $groupName = posix_getgrnam( $t['groupName'] ) ) !== false )
{
$t['groupId'] = $groupName['gid'];
}
}
}
/**
* Sets this header with the values from the ezcArchiveEntry $entry.
*
* The values that are possible to set from the ezcArchiveEntry $entry are set in this header.
* The properties that may change are: fileName, fileMode, userId, groupId, fileSize, modificationTime,
* linkName, and type.
*
* @param ezcArchiveEntry $entry
* @return void
*/
public function setHeaderFromArchiveEntry( ezcArchiveEntry $entry )
{
$this->splitFilePrefix( $entry->getPath( false ), $file, $filePrefix );
$this->fileName = $file;
$this->filePrefix = $filePrefix;
$this->fileMode = $entry->getPermissions();
$this->userId = $entry->getUserId();
$this->groupId = $entry->getGroupId();
$this->fileSize = $entry->getSize();
$this->modificationTime = $entry->getModificationTime();
$this->linkName = $entry->getLink( false );
switch ( $entry->getType() )
{
case ezcArchiveEntry::IS_FILE:
$this->type = 0;
break;
case ezcArchiveEntry::IS_LINK:
$this->type = 1;
break;
case ezcArchiveEntry::IS_SYMBOLIC_LINK:
$this->type = 2;
break;
case ezcArchiveEntry::IS_CHARACTER_DEVICE:
$this->type = 3;
break;
case ezcArchiveEntry::IS_BLOCK_DEVICE:
$this->type = 4;
break;
case ezcArchiveEntry::IS_DIRECTORY:
$this->type = 5;
break;
case ezcArchiveEntry::IS_FIFO:
$this->type = 6;
break;
// Devices, etc are set to \0.
default:
$this->type = "";
break; // ends up as a \0 character.
}
$this->deviceMajorNumber = $entry->getMajor();
$this->deviceMinorNumber = $entry->getMinor();
$length = strlen( $this->fileName );
if ( $entry->getType() == ezcArchiveEntry::IS_DIRECTORY )
{
// Make sure that the filename ends with a slash.
if ( $this->fileName[ $length - 1] != "/" )
{
$this->fileName .= "/";
}
}
else
{
if ( $this->fileName[ $length - 1] == "/" )
{
$this->fileName = substr( $this->fileName, 0, -1 ); // Remove last character.
}
}
}
/**
* Splits the path $path, if it exceeds 100 tokens, into two parts: $file and $filePrefix.
*
* If the path contains more than 100 tokens, it will put the directory name in the $filePrefix and
* the fileName into $file.
* This is the same method as Gnu Tar splits the file and file prefix.
*
* @throws ezcArchiveIoException if the file name cannot be written to the archive.
* @param string $path
* @param string &$file
* @param string &$filePrefix
* @return void
*/
protected function splitFilePrefix( $path, &$file, &$filePrefix )
{
if ( strlen( $path ) > 100 )
{
$filePrefix = dirname( $path );
$file = basename( $path );
if ( strlen( $filePrefix ) > 155 || strlen( $file ) > 100 )
{
throw new ezcArchiveIoException( "Filename too long: $path" );
}
}
else
{
$filePrefix = "";
$file = $path;
}
}
/**
* Serializes this header and appends it to the given ezcArchiveBlockFile $archiveFile.
*
* @param ezcArchiveBlockFile $archiveFile
* @return void
*/
public function writeEncodedHeader( ezcArchiveBlockFile $archiveFile )
{
// Offset | Field size | Description
// ----------------------------------
// 0 | 100 | Name of file
// 100 | 8 | File mode
// 108 | 8 | Owner user ID
// 116 | 8 | Owner group ID
// 124 | 12 | Length of file in bytes
// 136 | 12 | Modify time of file
// 148 | 8 | Checksum for header
// 156 | 1 | Type flag.
// 157 | 100 | Name of linked file
// 257 | 6 | USTAR indicator.
// 263 | 2 | USTAR version.
// 265 | 32 | Owner user name.
// 297 | 32 | Owner group name.
// 329 | 8 | Major device number.
// 337 | 8 | Minor device number.
// 345 | 155 | Filename prefix.
// 500 | 12 | NUL.
if ( ezcBaseFeatures::hasFunction( 'posix_getpwuid' ) )
{
$posixName = ( posix_getpwuid( $this->userId ) );
$posixGroup = ( posix_getgrgid( $this->groupId ) );
}
else
{
$posixName['name']= 'nobody';
$posixGroup['name']= 'nogroup';
}
$enc = pack( "a100a8a8a8a12a12a8a1a100a6a2a32a32a8a8a155a12",
$this->fileName,
str_pad( $this->fileMode, 7, "0", STR_PAD_LEFT),
str_pad( decoct( $this->userId ), 7, "0", STR_PAD_LEFT),
str_pad( decoct( $this->groupId ), 7, "0", STR_PAD_LEFT),
str_pad( decoct( $this->fileSize ), 11, "0", STR_PAD_LEFT),
str_pad( decoct( $this->modificationTime ), 11, "0", STR_PAD_LEFT),
" ",
$this->type,
$this->linkName,
"ustar",
"00",
$posixName["name"],
$posixGroup["name"],
sprintf( "%07s", decoct( $this->deviceMajorNumber ) ),
sprintf( "%07s", decoct( $this->deviceMinorNumber ) ),
$this->filePrefix,
"" );
$enc = $this->setChecksum( $enc );
$archiveFile->append( $enc );
}
/**
* Updates the given ezcArchiveFileStructure $struct with the values from this header.
*
* The values that can be set in the archiveFileStructure are: path, gid, uid, type, link, mtime, mode, and size.
*
* @throws ezcArchiveValueException
* if trying to set the structure type to the reserved type
* @param ezcArchiveFileStructure &$struct
* @return void
*/
public function setArchiveFileStructure( ezcArchiveFileStructure &$struct )
{
parent::setArchiveFileStructure( $struct );
if ( $this->filePrefix != '' )
{
$struct->path = $this->filePrefix . DIRECTORY_SEPARATOR . $this->fileName;
}
else
{
$struct->path = $this->fileName;
}
$struct->major = $this->deviceMajorNumber;
$struct->minor = $this->deviceMinorNumber;
$struct->userName = $this->userName;
$struct->groupName = $this->groupName;
// Override the link type.
switch ( $this->type )
{
case "\0":
case 0:
$struct->type = ezcArchiveEntry::IS_FILE;
break;
case 1:
$struct->type = ezcArchiveEntry::IS_LINK;
break;
case 2:
$struct->type = ezcArchiveEntry::IS_SYMBOLIC_LINK;
break;
case 3:
$struct->type = ezcArchiveEntry::IS_CHARACTER_DEVICE;
break;
case 4:
$struct->type = ezcArchiveEntry::IS_BLOCK_DEVICE;
break;
case 5:
$struct->type = ezcArchiveEntry::IS_DIRECTORY;
break;
case 6:
$struct->type = ezcArchiveEntry::IS_FIFO;
break;
case 7:
$struct->type = ezcArchiveEntry::IS_RESERVED;
break;
}
if ( $struct->type == ezcArchiveEntry::IS_RESERVED )
{
throw new ezcArchiveValueException( $struct->type, " < " . ezcArchiveEntry::IS_RESERVED );
}
}
}
?>
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