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<?php
/**
* File contains the ezcArchiveV7Header 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 ezcArchiveV7Header class represents the Tar V7 header.
*
* ezcArchiveV7Header 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 V7 Header has the following structure:
*
* <pre>
* +--------+------------+------------------+-----------------------------------------------------------+
* | Offset | Field size | Property | Description |
* +--------+------------+------------------+-----------------------------------------------------------+
* | 0 | 100 | fileName | Name of 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 | 72 | - | NUL. |
* | 329 | 8 | - | Compatibility with GNU tar: Major device set to: 00000000.|
* | 337 | 8 | - | Compatibility with GNU tar: Minor device set to: 00000000.|
* | 345 | 167 | - | 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 ezcArchiveV7Header
{
/**
* Relative byte position that the header starts.
*/
const START_HEADER = 0;
/**
* Relative byte position that the checksum starts.
*/
const CHECKSUM_OFFSET = 148;
/**
* Number of bytes that the checksum occupies.
*/
const CHECKSUM_SIZE = 8;
/**
* Relative byte position that the checksum ends.
*/
const END_HEADER = 512;
/**
* Number of bytes that a block occupies.
*/
const BLOCK_SIZE = 512;
/**
* Holds the properties of this class.
*
* @var array(string=>mixed)
*/
protected $properties = array();
/**
* 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 "fileName":
case "fileMode":
case "userId":
case "groupId":
case "fileSize":
case "modificationTime":
case "checksum":
case "type":
case "linkName":
$this->properties[$name] = $value;
break;
default:
throw new ezcBasePropertyNotFoundException( $name );
}
}
/**
* 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 "fileName":
case "fileMode":
case "userId":
case "groupId":
case "fileSize":
case "modificationTime":
case "checksum":
case "type":
case "linkName":
return $this->properties[ $name ];
default:
throw new ezcBasePropertyNotFoundException( $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.
*
* @throws ezcArchiveChecksumException
* if the checksum from the file did not match the calculated one
* @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 | Indicator for links
// 157 | 100 | Name of linked file
// ------------------------------------------
// 257 | 72 | NUL.
// 329 | 8 | Compatibility with GNU tar: Major device set to: 00000000.
// 337 | 8 | Compatibility with GNU tar: Minor device set to: 00000000.
// 345 | 167 | NUL.
if ( !is_null( $file ) )
{
$this->properties = unpack ( "a100fileName/".
"a8fileMode/".
"a8userId/".
"a8groupId/".
"a12fileSize/".
"a12modificationTime/".
"a8checksum/".
"a1type/".
"a100linkName", $file->current() );
$this->properties["userId"] = octdec( $this->properties["userId"] );
$this->properties["groupId"] = octdec( $this->properties["groupId"] );
$this->properties["fileSize"] = octdec( $this->properties["fileSize"] );
$this->properties["modificationTime"] = octdec( $this->properties["modificationTime"] );
$this->properties["checksum"] = octdec( $this->properties["checksum"] );
if ( !$this->checksum( $this->checksum, $file->current() ) )
{
throw new ezcArchiveChecksumException( $file->getFileName() );
}
}
}
/**
* Returns true when the checksum $checksum matches with the header data $rawHeader; otherwise returns false.
*
* The checksum is calculated by the {@link ezcArchiveChecksums::getTotalByteValueFromString()}.
*
* @param int $checksum
* @param string $rawHeader
* @return bool
*/
protected function checksum( $checksum, $rawHeader )
{
$total = ezcArchiveChecksums::getTotalByteValueFromString( substr( $rawHeader, self::START_HEADER, self::END_HEADER - self::START_HEADER ) );
// assume blanks for the checksum itself.
$total -= ezcArchiveChecksums::getTotalByteValueFromString( substr( $rawHeader, self::CHECKSUM_OFFSET, self::CHECKSUM_SIZE ) );
$total += ezcArchiveChecksums::getTotalByteValueFromString( str_repeat( " ", self::CHECKSUM_SIZE ) );
return ( strcmp( sprintf( "%08x", $checksum ), sprintf( "%08x", $total ) ) == 0 );
}
/**
* Returns the encoded header as given as the parameter $encodedHeader but includes the
* checksum of the header.
*
* The encoded header $encodedHeader should have spaces at the place where the checksum should be stored.
*
* @param string $encodedHeader
* @return string
*/
protected function setChecksum( $encodedHeader )
{
$total = ezcArchiveChecksums::getTotalByteValueFromString( $encodedHeader );
$checksum = pack( "a7", str_pad( decoct( $total ), 6, "0", STR_PAD_LEFT ) );
$checksum .= " ";
$begin = substr( $encodedHeader, 0, 148 );
$end = substr( $encodedHeader, 156 );
return $begin.$checksum.$end;
}
/**
* 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->fileName = $entry->getPath( false );
$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 = "";
break; // ends up as a \0 character.
case ezcArchiveEntry::IS_LINK:
$this->type = 1;
break;
case ezcArchiveEntry::IS_SYMBOLIC_LINK:
$this->type = 2;
break;
case ezcArchiveEntry::IS_DIRECTORY:
$this->type = 5;
break;
// Devices, etc are set to \0.
default:
$this->type = "";
break; // ends up as a \0 character.
}
$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( $header->fileName, 0, -1 ); // Remove last character.
}
}
}
/**
* 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 | Indicator for links
// 157 | 100 | Name of linked file
// ------------------------------------------
// 257 | 72 | NUL.
// 329 | 8 | Compatibility with GNU tar: Major device set to: 00000000.
// 337 | 8 | Compatibility with GNU tar: Minor device set to: 00000000.
// 345 | 167 | NUL.
//
$enc = pack( "a100a8a8a8a12a12a8a1a100a72a8a8a167",
$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,
"",
"0000000",
"0000000",
"" );
$enc = $this->setChecksum( $enc );
$archiveFile->append( $enc );
}
/**
* Updates the given ezcArchiveFileStructure $struct with the values from
* this header.
*
* The values that can be set in the archiveFileStructure are: path, gid,
* uid, type, link, mtime, mode, and size.
*
* @param ezcArchiveFileStructure &$struct
* @return void
*/
public function setArchiveFileStructure( ezcArchiveFileStructure &$struct )
{
$struct->path = $this->fileName;
$struct->gid = $this->groupId;
$struct->uid = $this->userId;
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;
}
// trailing slash means directory
if ( $this->fileName[ strlen( $this->fileName ) - 1 ] == '/' )
{
$struct->type = ezcArchiveEntry::IS_DIRECTORY;
}
$struct->link = $this->linkName;
$struct->mtime = $this->modificationTime;
$struct->mode = $this->fileMode;
$struct->size = $this->fileSize;
}
}
?>
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