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<?php
//============TAR Class v0.9.02============\\
// Author: Emdek                           \\
// URL: http://emdek.cba.pl                \\
// Licence: LGPL                           \\
// Last modified: 2008-03-01 14:38:21 CET  \\
//                                         \\
// Inspired by TAR Manager (C) Josh Barger \\
//=========================================\\

class TAR {
/// Internal variables
private $FileName;
private $Handle;
private $Files;
private $Entries;
private $Modified = 0;

/// Saving (compression) modes
// No compression
const NONE = 1;
// Gzip, if available
const GZIP = 2;
// Bzip, if available
const BZIP = 4;
// LZF, if available
const LZF = 8;

/// Internal methods
public function __destruct () {
    if ($this->Modified) $this->save ();
    }
// Computes the checksum of an entry header
private function checksum ($ByteString) {
    $CheckSum = 0;
    for ($i = 0; $i < 512; $i++) {
        if ($i == 148) {
            $i += 7;
            continue;
            }
        $CheckSum += ord ($ByteString[$i]);
        }
    return ($CheckSum + 256);
    }
// Unpad a NULL padded string
private function str_unpad ($String) {
    return (substr ($String, 0, strpos ($String, "\0")));
    }
// Prepare path to file
private function file_path ($FileName) {
    if (!file_exists ($FileName)) return (0);
    $Extension = explode ('.', $FileName);
    $Extension = strtolower (end ($Extension));
    if ($Extension == 'bz2') {
        if (!function_exists ('bzopen')) return (0);
        $FileName = 'compress.bzip2://'.$FileName;
        }
    else if (in_array ($Extension, array ('gz', 'tgz'))) {
        if (!function_exists ('gzopen')) return (0);
        $FileName = 'compress.zlib://'.$FileName;
        }
    return ($FileName);
    }
// Parses TAR file
private function parse ($FileName, $Store = 0, $Validate = 0, $OverWrite = 0) {
    if (!$FileName = $this->file_path ($FileName)) return (0);
    $TAR = fopen ($FileName, 'rb');
    while (!feof ($TAR)) {
        $Header = fread ($TAR, 512);
        if (!$Header) {
            if ($Validate) return (substr_count ($Header, "\0") == 512);
            break;
            }
        $FileName = $this->str_unpad (substr ($Header, 0, 100));
        if (isset ($this->Entries[$FileName]) && !$OverWrite && !$Validate) continue;
        $TmpArray = array (
            'mode' => substr ($Header, 100, 8),
            'uid' => octdec (substr ($Header, 108, 8)),
            'gid' => octdec (substr ($Header, 116, 8)),
            'size' => octdec (substr ($Header, 124, 12)),
            'mtime' => octdec (substr ($Header, 136, 12)),
            'chksum' => octdec (substr ($Header, 148, 6)),
            'type' => substr ($Header, 156, 1),
            'linkname' => $this->str_unpad (substr ($Header, 157, 100)),
            'uname' => $this->str_unpad (substr ($Header, 265, 32)),
            'gname' => $this->str_unpad (substr ($Header, 297, 32)),
            );
        if ($this->checksum ($Header) == $TmpArray['chksum']) {
            if ($Validate) continue;
            $this->Entries[$FileName] = $TmpArray;
            $this->Entries[$FileName]['position'] = ftell ($TAR);
            }
        else if ($Validate) return (0);
        $BlockSize = (ceil ($TmpArray['size'] / 512) * 512);
        if ($BlockSize) {
            if ($Store) {
                $this->Files[$FileName] = '';
                $Blocks = floor ($TmpArray['size'] / 8192);
                for ($i = 0; $i < $Blocks; $i++) $this->Files[$FileName].= fread ($TAR, 8192);
                if ($TmpArray['size'] % 8192) $this->Files[$FileName].= fread ($TAR, ceil ($TmpArray['size'] % 8192));
                if ($BlockSize - $TmpArray['size']) fseek ($TAR, ($BlockSize - $TmpArray['size']), SEEK_CUR);
                }
            else fseek ($TAR, $BlockSize, SEEK_CUR);
            }
        }
    fclose ($TAR);
    return (!$Validate);
    }
// Generates a TAR entry
private function entry_generate ($Name, $Array) {
    $Keys = array ('mode', 'uid', 'gid', 'size', 'mtime');
    $String = str_pad ($Name, 100, "\0");
    for ($i = 0; $i < 5; $i++) $String.= str_pad (decoct ($Array[$Keys[$i]]), (($i < 3)?7:11), '0', STR_PAD_LEFT)."\0";
    $String.= '      '."\0".chr (32).$Array['type'].str_pad ($Array['linkname'], 100, "\0").'ustar'.chr (32).chr (32)."\0";
    $String.= str_pad ($Array['uname'], 32, "\0").str_pad ($Array['gname'], 32, "\0").str_repeat ("\0", 183);
    $String = substr ($String, 0, 148).str_pad (decoct ($this->checksum ($String)), 6, '0', STR_PAD_LEFT).substr ($String, 154);
    if (!$Array['type'] || $Array['type'] == 1) {
        if (!isset ($this->Files[$Name]) && !($File = implode ('', $this->entry_get ($Name))) && $Array['size']) return ('');
        $String.= str_pad ((isset ($this->Files[$Name])?$this->Files[$Name]:$File), (ceil ($Array['size'] / 512) * 512), "\0");
        }
    return ($String);
    }
/// Public methods
// Information about class version...
public function version () {
    return ('TAR class v0.9.02 (2008-03-01)');
    }
// Opens a TAR file
public function open ($FileName) {
    $this->FileName = $FileName;
    if (!is_file ($FileName)) {
        touch ($FileName);
        return (is_file ($FileName));
        }
    $OpenName = $this->file_path ($FileName);
    if ($OpenName != $this->FileName) {
        if (!$this->Handle = tmpfile ()) return (0);
        fwrite ($this->Handle, file_get_contents ($OpenName));
        }
    else $this->Handle = fopen ($FileName, 'rb');
    return ($this->parse ($FileName));
    }
// Returns array of entries (optional from specified path)
public function entries ($Path = NULL) {
    if ($Path === NULL) return ($this->Entries);
    if (!isset ($this->Entries[$Path]) && $Path) return (0);
    $Array = array ();
    $Length = strlen ($Path);
    foreach ($this->Entries as $Key => $Value) {
        if ($Path) {
            $Sub = substr ($Key, 0, $Length);
            if ($Sub != $Path || $Path == $Key) continue;
            $Sub = substr ($Key, $Length);
            }
        else $Sub = &$Key;
        $Tmp = substr_count ($Sub, '/');
        if ($Tmp > 1 || ($Tmp == 1 && substr ($Sub, -1) != '/')) continue;
        $Array[$Key] = &$Value;
        }
    return ($Array);
    }
// Appends a TAR file to the archive
public function append ($FileName, $OverWrite = 0) {
    $this->Modified = 1;
    return ($this->parse ($FileName, 1, 0, $OverWrite));
    }
// Check if entry exists
public function entry_exists ($Entry) {
    return (isset ($this->Entries[$Entry]));
    }
// Information about specified entry
public function entry_information ($Entry) {
    if (!isset ($this->Entries[$Entry])) return (0);
    return ($this->Entries[$Entry]);
    }
// Delete an entry from the archive
public function entry_delete ($Entry = '') {
    if (!$Entry) {
        unset ($this->Entries);
        return (1);
        }
    if (!isset ($this->Entries[$Entry])) return (0);
    if ($this->Entries[$Entry]['type'] == 5) {
        $Entries = array_keys ($this->Entries);
        $Length = strlen ($Entry);
        for ($i = 0, $c = count ($Entries); $i < $c; $i++) {
            if (substr ($Entries[$i], $Length) == $Entry) unset ($this->Entries[$Entries[$i]]);
            }
        }
    unset ($this->Entries[$Entry]);
    $this->Modified = 1;
    return (1);
    }
// Add an entry to the archive
public function entry_add ($FileName, $LocalName = '', $OverWrite = 0) {
    if (!file_exists ($FileName)) return (0);
    $Stat = stat ($FileName);
    if (($Stat['mode'] & 0xC000) == 0xC000) $Type = 8;
    else if (($Stat['mode'] & 0xA000) == 0xA000) $Type = 2;
    else if (($Stat['mode'] & 0x8000) == 0x8000) $Type = 0;
    else if (($Stat['mode'] & 0x6000) == 0x6000) $Type = 4;
    else if (($Stat['mode'] & 0x4000) == 0x4000) $Type = 5;
    else if (($Stat['mode'] & 0x2000) == 0x2000) $Type = 3;
    else if (($Stat['mode'] & 0x1000) == 0x1000) $Type = 6;
    else $Type = 9;
    if (($Type == 5) && substr ($FileName, -1) != '/') $FileName.= '/';
    $Name = $LocalName.((substr ($LocalName, -1) == '/' && $Type == 5)?'':basename ($FileName).(($Type == 5)?'/':''));
    if (isset ($this->Entries[$Name]) && !$OverWrite) return (0);
    if (function_exists ('posix_getgrgid')) {
        $Group = posix_getgrgid ($Stat['gid']);
        $Owner = posix_getpwuid ($Stat['uid']);
        }
    else $Owner['name'] = $Group['name'] = '';
    $this->Entries[$Name] = array (
        'chksum' => '',
        'gname' => $Group['name'],
        'gid' => $Stat['gid'],
        'linkname' => (($Type == 2)?readlink (($Type == 5)?substr ($FileName, 0, -1):$FileName):''),
        'mode' => $Stat['mode'],
        'mtime' => $Stat['mtime'],
        'size' => $Stat['size'],
        'type' => $Type,
        'uid' => $Stat['uid'],
        'uname' => $Owner['name'],
        );
    if ($Type == 5) {
        $Files = glob ($FileName.'*');
        for ($i = 0, $c = count ($Files); $i < $c; $i++) $this->entry_add ($Files[$i], $LocalName.(is_dir ($Files[$i])?basename ($Files[$i]).'/':''));
        }
    else $this->Files[$Name] = file_get_contents ($FileName);
    $this->Modified = 1;
    return (1);
    }
// Add an entry to the archive from string
public function entry_add_from_string ($LocalName, $Contents = '', $OverWrite = 1, $Dir = 0) {
    if (strstr ($LocalName, '/') && substr_count ($LocalName, '/') > 1) $this->entry_add_from_string (substr ($LocalName, 0, (strrpos (substr ($LocalName, 0, -1), '/') + 1)), '', 0, 1);
    if (isset ($this->Entries[$LocalName]) && !$OverWrite) return (0);
    $this->Entries[$LocalName] = array (
        'chksum' => '',
        'gname' => '',
        'gid' => 0,
        'linkname' => '',
        'mode' => ($Dir?0000775:0000644),
        'mtime' => time (),
        'size' => ($Dir?0:strlen ($Contents)),
        'type' => ($Dir?5:0),
        'uid' => 0,
        'uname' => '',
        );
    if (!$Dir) $this->Files[$LocalName] = $Contents;
    $this->Modified = 1;
    return (1);
    }
// Update an entry in the archive
public function entry_update ($LocalName, $Contents = NULL, $Array = NULL) {
    if (!isset ($this->Entries[$LocalName])) return (0);
    if ($Contents !== NULL) {
        $this->Files[$LocalName] = $Contents;
        $this->Entries[$LocalName]['size'] = strlen ($Contents);
        }
    if ($Array !== NULL) {
        $Keys = array ('gname', 'gid', 'linkname', 'mode', 'mtime', 'uid', 'uname');
        for ($i = 0; $i < 7; ++$i) {
            if (isset ($Array[$Keys[$i]])) $this->Entries[$LocalName][$Keys[$i]] = $Array[$Keys[$i]];
            }
        }
    $this->Modified = 1;
    return (1);
    }
// Rename an entry in the archive
public function entry_rename ($OldName, $NewName) {
    if (!isset ($this->Entries[$OldName])) return (0);
    $Length = strlen ($OldName);
    foreach ($this->Entries as $Key => $Value) {
        if (substr ($Key, 0, $Length) == $OldName) {
            $Path = $NewName.substr ($Key, $Length);
            $this->Entries[$Path] = &$this->Entries[$Key];
            unset ($this->Entries[$Key]);
            if (isset ($this->Files[$Key])) {
                $this->Files[$Path] = &$this->Files[$Key];
                unset ($this->Files[$Key]);
                }
            }
        }
    return (1);
    }
// Returns contents of entries from specified path
public function entry_get ($Path) {
    if ((!isset ($this->Entries[$Path]) && $Path) || !$this->Entries) return (0);
    $Length = strlen ($Path);
    $Files = array ();
    foreach ($this->Entries as $Key => $Value) {
        $Entry = $Key;
        if (!$Path || substr ($Key, 0, $Length) == $Path) {
            if (!$Path || substr ($Path, -1) == '/') {
                if ($Key == $Path) continue;
                $Key = substr ($Key, $Length);
                }
            else $Key = basename ($Path);
            if (isset ($this->Files[$Entry])) $Files[$Key] = $this->Files[$Entry];
            else $Files[$Key] = stream_get_contents ($this->Handle, $this->Entries[$Entry]['size'], $this->Entries[$Entry]['position']);
            }
        }
    return ($Files);
    }
// Extracts specified entries to specified destination
public function extract ($Destination = '', $Entry = '') {
    if (!$Entries = $this->entry_get ($Entry)) return (0);
    ksort ($Entries);
    if (!$Entry || !$this->Entries[$Entry]['type']) {
        $DirName = dirname ($Entry);
        $Entry = $DirName.($DirName?'/':'');
        }
    foreach ($Entries as $Key => $Value) {
        if (!isset ($this->Entries[$Entry.$Key]) || file_exists ($Destination.$Key)) continue;
        if ($this->Entries[$Entry.$Key]['type']) {
            if (!mkdir ($Destination.$Key, 0777)) return (0);
            chmod ($Destination.$Key, 0777);
            }
        else {
            if (!file_put_contents ($Destination.$Key, $Value) && $this->Entries[$Entry.$Key]['size']) return (0);
            }
        }
    return (1);
    }
// Saves archive (current or new) with optional compression
public function save ($FileName = '', $Mode = 1) {
    $TAR = '';
    if (!$this->Entries || !$this->Modified) return (0);
    ksort ($this->Entries);
    if (!$FileName) $FileName = $this->FileName;
    foreach ($this->Entries as $Key => $Value) $TAR.= $this->entry_generate ($Key, $Value);
    $Length = strlen ($TAR);
    $TAR.= str_repeat ("\0", 512);
    if (substr ($FileName, -4) != '.tar') $FileName.= '.tar';
    switch ($Mode) {
        case self::BZIP:
        if (!function_exists ('bzcompress')) break;
        $TAR = bzcompress ($TAR);
        $FileName.= '.bz2';
        break;
        case self::GZIP:
        if (!function_exists ('gzcompress')) break;
        $TAR = gzencode ($TAR);
        $FileName.= '.gz';
        break;
        case self::LZF:
        if (!function_exists ('lzf_compress')) break;
        $TAR = lzf_compress ($TAR);
        $FileName.= '.lzf';
        break;
        }
    $this->Modified = 0;
    return (file_put_contents ($FileName, $TAR));
    }
// Clears entries variables
public function clear () {
    unset ($this->Entries, $this->Files);
    }
// Closes the archive
public function close () {
    $this->clear ();
    unset ($this->FileName);
    if ($this->Handle) fclose ($this->Handle);
    }
}
?>