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<?php |
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/* |
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OpenIsis - an open implementation of the CDS/ISIS database |
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Version 0.8.x (patchlevel see file Version) |
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Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org |
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|
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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|
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see README for more information |
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EOH */ |
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|
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// $Id: File.php,v 1.4 2003/06/13 19:35:24 kripke Exp $ |
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|
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|
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/** |
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the magic for a 4/4/0 little endian isis xref file. |
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http://OpenIsis.org/openisis/doc/Serialized |
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*/ |
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define( 'ISIS_FILE_MAGIC', "ISIXD\0:)" ); |
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/** |
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The flat file database. |
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It does not know anything about isis records, |
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it's just dealing with the string representation. |
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|
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58971 records (unesb), 29442129 bytes flat (34565120 as .mst) |
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mkxrf: 8.1 sec (7280 recs / sec) |
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read all (just the string): 3.48 sec (~17.000 recs / sec) |
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read 10.000, creating recs: 3.95 sec |
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read 1.000, creating recs, printing: ~2 sec |
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|
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@version $Revision: 1.4 $ |
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@license LGPL |
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@package Isis |
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*/ |
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class Isis_File { |
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var $name; |
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var $mst; |
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var $xrf = 0; |
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var $w; |
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/** number of records == number of last record |
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*/ |
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var $len = 0; |
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|
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function Isis_File ( $name, $write = 0 ) |
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{ |
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$this->name = $name; |
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$this->w = $write; |
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$this->mst = fopen($name.'.txt', $write ? 'a+' : 'r'); |
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if ( ! $this->mst ) |
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return; |
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flock($this->mst, $write ? LOCK_EX : LOCK_SH); |
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$s = fstat($this->mst); |
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$mtime = $s['mtime']; |
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if ( file_exists($name.'.ptr') ) // avoid annoying warning |
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$this->xrf = fopen($name.'.ptr', $write ? 'r+' : 'r'); |
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if (!$this->xrf) |
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$remake = 1; |
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else { |
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$s = fstat($this->xrf); |
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$magic = fread($this->xrf, 8); |
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$remake = $s['mtime'] < $mtime || ISIS_FILE_MAGIC != $magic; |
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if ( !$remake ) |
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$this->len = $s['size'] / 8 - 1; |
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if ( $remake && !$write ) { |
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fclose($this->xrf); |
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$this->xrf = 0; |
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} |
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} |
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if ( !$this->xrf && !($this->xrf = fopen($name.'.ptr','w+')) ) { |
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fclose($this->mst); |
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return; |
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} |
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if ( $remake ) |
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$this->mkxref(); |
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} |
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|
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|
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function mkxref () |
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{ |
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fseek($this->mst, 0); |
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ftruncate($this->xrf, 0); |
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fseek($this->xrf, 0); |
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fwrite( $this->xrf, ISIS_FILE_MAGIC, 8 ); |
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$mfn = 0; |
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$lines = 0; |
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for (;;) { |
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$line = fgets($this->mst); |
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$end = !is_string($line) || '' == $line; |
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if ( $end || "\n" == $line{0} ) { |
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$now = ftell($this->mst); |
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$len = $now - $pos - 1; |
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if ( $len && !$end ) |
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$len--; |
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if ($mfn) { |
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$xrf = pack('VV', $pos, $len); |
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// echo "mfn $mfn pos $pos len $len\n"; |
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if ( 8 != ($foo = fwrite($this->xrf, $xrf)) ) |
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echo "FOO! $foo\n"; |
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if ($this->len < $mfn) |
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$this->len = $mfn; |
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} |
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if ($end) |
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break; |
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$mfn++; |
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$pos = $now; |
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$lines = 0; |
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continue; |
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} |
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if ( ! $lines |
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&& ! (int)$line |
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&& 2 == sscanf($line, "%c %d", &$ctrl, &$num) |
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&& 'W' == $ctrl |
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) { |
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echo "W $num\n"; |
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$pos = ftell($this->mst); |
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$mfn = $num; |
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fseek($this->xrf, 8*$mfn); |
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continue; |
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} |
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$lines++; |
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} |
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fflush( $this->xrf ); |
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} // mkxref |
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|
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|
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/** |
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@return string number $mfn or null |
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*/ |
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function read ( $mfn ) |
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{ |
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fseek($this->xrf, 8*$mfn); |
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$xrf = fread( $this->xrf, 8 ); |
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if ( 8 != strlen($xrf) ) { |
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// echo "no xrf for $mfn\n"; |
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return null; |
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} |
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$xrf = unpack('Vpos/Vlen', $xrf); |
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// echo "mfn $mfn pos ${xrf['pos']} len ${xrf['len']}\n"; |
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if ( !$xrf['pos'] || !$xrf['len'] ) |
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return null; |
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fseek($this->mst, $xrf['pos']); |
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$rec = fread($this->mst, $xrf['len']); |
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return $xrf['len'] == strlen($rec) ? $rec : null; |
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} |
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|
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|
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/** |
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write $data as $mfn or ++$this->len |
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@return mfn |
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*/ |
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function write ( $data, $mfn = 0 ) |
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{ |
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if ( !$this->w ) |
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trigger_error( $this->name.' not writable', E_USER_ERROR ); |
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if ( !$mfn ) |
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$mfn = ++$this->len; |
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elseif ($this->len < $mfn) |
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$this->len = $mfn; |
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if ( !is_string($data) ) |
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$len = 0; |
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elseif ( $len = strlen($data) ) { |
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if ("\n" == $data{$len-1}) |
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$len--; |
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else |
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$data .= "\n"; |
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} |
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fseek($this->mst, 0, SEEK_END); // prbly not needed by mode a+ |
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fwrite($this->mst, "\nW\t$mfn\n"); |
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fflush($this->mst); |
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$pos = ftell($this->mst); |
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if ( $len ) |
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fwrite($this->mst, $data); |
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fseek($this->xrf, 8*$mfn); |
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// echo "write $mfn len $len\n"; |
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fwrite($this->xrf, pack('VV', $pos, $len)); |
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fflush($this->xrf); |
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return $mfn; |
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} |
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|
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|
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function compact () |
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{ |
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if ( !$this->w ) |
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trigger_error( $this->name.' not writable', E_USER_ERROR ); |
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$c = fopen($this->name.'.new', 'w+'); |
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flock($c, LOCK_EX); // so we have exclusive locks on both |
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for ( $n=1; $n<=$this->len; $n++ ) |
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fwrite($c, is_null($data = $this->read($n)) |
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? "\n" : "\n".$data."\n" |
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); |
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fflush($c); |
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if ( file_exists($this->name.'.old') ) |
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unlink($this->name.'.old'); |
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rename($this->name.'.txt', $this->name.'.old'); |
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rename($this->name.'.new', $this->name.'.txt'); |
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fclose($this->mst); |
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$this->mst = $c; |
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$this->mkxref(); // frob the xref in place |
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} |
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|
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} // class Isis_File |
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?> |
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