includes/svnlib.php

   1 <?php
   2 /*=====================================================================*\
   3 || ################################################################### ||
   4 || # ViewSVN [#]version[#]
   5 || # --------------------------------------------------------------- # ||
   6 || # Copyright ©2002-[#]year[#] by Iris Studios, Inc. All Rights Reserved. # ||
   7 || # This file may not be reproduced in any way without permission.  # ||
   8 || # --------------------------------------------------------------- # ||
   9 || # User License Agreement at http://www.iris-studios.com/license/  # ||
  10 || ################################################################### ||
  11 \*=====================================================================*/
  12
  13 /**
  14 * Command line interface with the SVN commands
  15 *
  16 * @package      ViewSVN
  17 */
  18
  19 /**
  20 * Interacts with the command line subsystem to
  21 * access SVN information
  22 *
  23 * @package      ViewSVN
  24 * @version      $Id$
  25 */
  26 class SVNLib
  27 {
  28         /**
  29         * Path to the SVN binary
  30         * @var  string
  31         */
  32         var $svnpath;
  33
  34         /**
  35         * Common command system
  36         * @var  object
  37         */
  38         var $common;
  39
  40         /**
  41         * Constructor: validate SVN path
  42         *
  43         * @param        string  Path to SVN binary
  44         */
  45         function SVNLib($svnpath)
  46         {
  47                 global $viewsvn;
  48
  49                 $this->svnpath = $viewsvn->shell->cmd($svnpath);
  50
  51                 $this->common =& new SVNCommon();
  52
  53                 $access = $viewsvn->shell->exec($this->svnpath . ' --version');
  54
  55                 if (!$access)
  56                 {
  57                         $viewsvn->trigger->error('svn binary could not be found');
  58                 }
  59
  60                 if (!preg_match('#^svn, version (.*?)\)$#i', trim($access[0])))
  61                 {
  62                         $viewsvn->trigger->error('svn binary does not pass test');
  63                 }
  64         }
  65
  66         /**
  67         * Prepares data for output
  68         *
  69         * @access       public
  70         *
  71         * @param        string  Standard data
  72         *
  73         * @return       string  Output-ready data
  74         */
  75         function format($string)
  76         {
  77                 // convert entities
  78                 $string = htmlspecialchars($string);
  79
  80                 // tabs to 5 spaces
  81                 $string = str_replace("\t", '     ', $string);
  82
  83                 // spaces to nbsp
  84                 $string = str_replace(' ', '&nbsp;', $string);
  85
  86                 // convert advanced diff
  87                 $string = str_replace(array('{@++}', '{@--}'), array('<span class="diff_add">', '<span class="diff_del">'), $string);
  88                 $string = str_replace(array('{/@++}', '{/@--}'), '</span>', $string);
  89
  90                 // nl2br
  91                 $string = nl2br($string);
  92
  93                 return $string;
  94         }
  95
  96         /**
  97         * Executes the SVN binary
  98         *
  99         * @access       private
 100         *
 101         * @param        string  Command
 102         *
 103         * @return       array   Output
 104         */
 105         function svn($command)
 106         {
 107                 global $viewsvn;
 108
 109                 $output = $viewsvn->shell->exec($this->svnpath . ' ' . $command . ' 2>&1');
 110                 $temp = implode("\n", $output);
 111                 if (strpos($temp, '(apr_err=') !== false)
 112                 {
 113                         $viewsvn->trigger->error(nl2br($temp));
 114                 }
 115                 return $output;
 116         }
 117
 118         /**
 119         * SVN Wrapper: standard command system
 120         *
 121         * @access       private
 122         *
 123         * @param        string  SVN command
 124         * @param        string  Repository
 125         * @param        string  Path
 126         * @param        integer Revision
 127         *
 128         * @return       array   Lines of output
 129         */
 130         function std($command, $repos, $path, $revision)
 131         {
 132                 global $viewsvn;
 133
 134                 $revision = $this->rev($revision);
 135                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 136
 137                 return $this->svn($command . ' -r' . $revision . ' ' . $repospath . $path);
 138         }
 139
 140         /**
 141         * SVN Wrapper: blame
 142         *
 143         * @access       protected
 144         *
 145         * @param        string  Repository
 146         * @param        string  Path
 147         * @param        integer Revision
 148         *
 149         * @return       array   Lines of blame output
 150         */
 151         function blame($repos, $path, $revision)
 152         {
 153                 return $this->std('blame', $repos, $path, $revision);
 154         }
 155
 156         /**
 157         * SVN Wrapper: cat
 158         *
 159         * @access       protected
 160         *
 161         * @param        string  Repository
 162         * @param        string  Path
 163         * @param        integer Revision
 164         *
 165         * @return       array   Lines of cat output
 166         */
 167         function cat($repos, $path, $revision)
 168         {
 169                 return $this->std('cat', $repos, $path, $revision);
 170         }
 171
 172         /**
 173         * SVN Wrapper: diff
 174         *
 175         * @access       protected
 176         *
 177         * @param        string  Repository
 178         * @param        string  Path
 179         * @param        integer Lower revision
 180         * @param        integer Higher revision
 181         *
 182         * @return       array   Lines of diff output
 183         */
 184         function diff($repos, $path, $lorev, $hirev)
 185         {
 186                 global $viewsvn;
 187
 188                 $hirev = $this->rev($hirev);
 189                 $lorev = $this->rev($lorev);
 190                 if ($lorev == 'HEAD')
 191                 {
 192                         $lorev = 1;
 193                 }
 194
 195                 if (is_integer($hirev) AND is_integer($lorev))
 196                 {
 197                         if ($lorev > $hirev)
 198                         {
 199                                 $lorev = $hirev - 1;
 200                         }
 201                         if ($lorev == $hirev)
 202                         {
 203                                 $lorev = 0;
 204                         }
 205                 }
 206
 207                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 208
 209                 return $this->svn('diff -r' . $lorev . ':' . $hirev . ' ' . $repospath . $path);
 210         }
 211
 212         /**
 213         * SVN Wrapper: log
 214         *
 215         * @access       protected
 216         *
 217         * @param        string  Repository
 218         * @param        string  Path
 219         * @param        integer Lower revision
 220         * @param        integer Higher revision
 221         *
 222         * @return       array   Lines of log output
 223         */
 224         function log($repos, $path, $lorev, $hirev)
 225         {
 226                 global $viewsvn;
 227
 228                 $hirev = $this->rev($hirev);
 229                 $lorev = $this->rev($hirev);
 230                 if ($lorev == 'HEAD')
 231                 {
 232                         $lorev = 0;
 233                 }
 234
 235                 if (is_integer($hirev) AND is_integer($lorev))
 236                 {
 237                         if ($lorev > $hirev)
 238                         {
 239                                 $lorev = $hirev - 1;
 240                         }
 241                         if ($lorev == $hirev)
 242                         {
 243                                 $lorev = 0;
 244                         }
 245                 }
 246
 247                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 248
 249                 return $this->svn('log -v -r' . $hirev . ':' . $lorev . ' ' . $repospath . $path);
 250         }
 251
 252         /**
 253         * SVN Wrapper: ls (list)
 254         *
 255         * @access       protected
 256         *
 257         * @param        string  Repository
 258         * @param        string  Path
 259         * @param        integer Revision
 260         *
 261         * @return       array   Lines of list output
 262         */
 263         function ls($repos, $path, $revision)
 264         {
 265                 return $this->std('list', $repos, $path, $revision);
 266         }
 267
 268         /**
 269         * Generates a clean revision number
 270         *
 271         * @access       public
 272         *
 273         * @param        integer Revision number
 274         *
 275         * @return       mixed   Cleaned revision or HEAD
 276         */
 277         function rev($revision)
 278         {
 279                 if (($revision = intval($revision)) < 1)
 280                 {
 281                         $revision = 'HEAD';
 282                 }
 283                 return $revision;
 284         }
 285 }
 286
 287 /**
 288 * Commonly executed SVN commands that return data
 289 * used in many parts of the system
 290 *
 291 * @package      ViewSVN
 292 * @version      $Id$
 293 */
 294 class SVNCommon
 295 {
 296         /**
 297         * Registry object
 298         * @var  object
 299         */
 300         var $registry;
 301
 302         /**
 303         * List of revisions
 304         * @var  array
 305         */
 306         var $revisions;
 307
 308         /**
 309         * List of logs
 310         * @var  array
 311         */
 312         var $logs;
 313
 314         /**
 315         * Constructor: bind with registry
 316         */
 317         function SVNCommon()
 318         {
 319                 global $viewsvn;
 320
 321                 $this->registry =& $viewsvn;
 322         }
 323
 324         /**
 325         * Checks to see if the given universal path is
 326         * a directory
 327         *
 328         * @access       public
 329         *
 330         * @param        string  Universal path
 331         *
 332         * @return       bool    Directory or not
 333         */
 334         function isdir($path)
 335         {
 336                 $output = $this->registry->svn->std('info', $this->registry->paths->fetch_repos($path), $this->registry->paths->fetch_path($path), 'HEAD');
 337
 338                 foreach ($output AS $line)
 339                 {
 340                         if (preg_match('#^Node Kind: (.*)#', $line, $matches))
 341                         {
 342                                 if (trim(strtolower($matches[1])) == 'directory')
 343                                 {
 344                                         return true;
 345                                 }
 346                         }
 347                 }
 348
 349                 return false;
 350         }
 351
 352         /**
 353         * Get a list of revisions for a path
 354         *
 355         * @access       public
 356         *
 357         * @param        string  Universal path
 358         *
 359         * @return       array   Key revisions
 360         */
 361         function fetch_revs($path)
 362         {
 363                 if (!isset($this->revisions["$path"]))
 364                 {
 365                         $log = $this->fetch_logs($path);
 366
 367                         $revs = array_keys($log);
 368
 369                         $this->revisions["$path"] = array(
 370                                 'HEAD'  => $revs[0],
 371                                 'START' => $revs[ count($revs) - 1 ],
 372                                 'revs'  => $revs
 373                         );
 374                 }
 375
 376                 return $this->revisions["$path"];
 377         }
 378
 379         /**
 380         * Gets the revision that is marked as HEAD
 381         *
 382         * @access       public
 383         *
 384         * @param        string  Universal path
 385         *
 386         * @return       integer Revision
 387         */
 388         function fetch_head_rev($path)
 389         {
 390                 $revs = $this->fetch_revs($path);
 391                 return $revs['HEAD'];
 392         }
 393
 394         /**
 395         * Returns the previous revision to the one given
 396         *
 397         * @access       public
 398         *
 399         * @param        string  Universal path
 400         * @param        integer Arbitrary revision
 401         *
 402         * @return       integer Previous revision (-1 if none)
 403         */
 404         function fetch_prev_rev($path, $current)
 405         {
 406                 $revs = $this->fetch_revs($path);
 407
 408                 $index = array_search($current, $revs['revs']);
 409                 if ($current === false)
 410                 {
 411                         $message->trigger->error('revision ' . $current . ' is not in ' . $path);
 412                 }
 413
 414                 if (isset($revs['revs'][ $index + 1 ]))
 415                 {
 416                         return $revs['revs'][ $index + 1 ];
 417                 }
 418                 else
 419                 {
 420                         return -1;
 421                 }
 422         }
 423
 424         /**
 425         * Get a list of logs
 426         *
 427         * @access       public
 428         *
 429         * @param        string  Universal path
 430         *
 431         * @return       array   Log data
 432         */
 433         function fetch_logs($path)
 434         {
 435                 if (!isset($this->logs["$path"]))
 436                 {
 437                         $log = new SVNLog($this->registry->paths->fetch_repos($path), $this->registry->paths->fetch_path($path), 0, 0);
 438
 439                         $this->logs["$path"] = $log->fetch();
 440                 }
 441
 442                 return $this->logs["$path"];
 443         }
 444
 445         /**
 446         * Returns a given log entry for a path
 447         * and revision
 448         *
 449         * @access       public
 450         *
 451         * @param        string  Universal path
 452         * @param        integer Arbitrary revision
 453         *
 454         * @return       array   Log entry
 455         */
 456         function fetch_log($path, $rev)
 457         {
 458                 $logs = $this->fetch_logs($path);
 459
 460                 $rev = $this->registry->svn->rev($rev);
 461                 if ($rev == 'HEAD')
 462                 {
 463                         $rev = $this->fetch_head_rev($path);
 464                 }
 465
 466                 if (isset($logs["$rev"]))
 467                 {
 468                         return $logs["$rev"];
 469                 }
 470                 else
 471                 {
 472                         return null;
 473                 }
 474         }
 475 }
 476
 477 /**
 478 * Annotation/blame system; constructs an array
 479 * that is ready for output
 480 *
 481 * @package      ViewSVN
 482 * @version      $Id$
 483 */
 484 class SVNBlame
 485 {
 486         /**
 487         * Array of blame information
 488         * @var  array
 489         */
 490         var $blame = array();
 491
 492         /**
 493         * Raw "svn blame" output
 494         * @var  array
 495         */
 496         var $rawoutput;
 497
 498         /**
 499         * Constructor: create blame and store data
 500         *
 501         * @param        string  Repository
 502         * @param        string  Path
 503         * @param        integer Revision
 504         */
 505         function SVNBlame($repos, $path, $revision)
 506         {
 507                 global $viewsvn;
 508
 509                 $this->rawoutput = $viewsvn->svn->blame($repos, $path, $revision);
 510                 $this->process();
 511         }
 512
 513         /**
 514         * Returns blame for display
 515         *
 516         * @access       public
 517         *
 518         * @return       array   Blame data
 519         */
 520         function fetch()
 521         {
 522                 return $this->blame;
 523         }
 524
 525         /**
 526         * Parses the blame data
 527         *
 528         * @access       private
 529         */
 530         function process()
 531         {
 532                 $lineno = 1;
 533
 534                 foreach ($this->rawoutput AS $line)
 535                 {
 536                         if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)\s(.*)$#', $line, $matches))
 537                         {
 538                                 $this->blame[] = array(
 539                                         'rev'           => $matches[1],
 540                                         'author'        => $matches[2],
 541                                         'line'          => $matches[3],
 542                                         'lineno'        => $lineno++
 543                                 );
 544                         }
 545                         // a blank line
 546                         else if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)$#', $line, $matches))
 547                         {
 548                                 $this->blame[] = array(
 549                                         'rev'           => $matches[1],
 550                                         'author'        => $matches[2],
 551                                         'line'          => '',
 552                                         'lineno'        => $lineno++
 553                                 );
 554                         }
 555                 }
 556         }
 557 }
 558
 559 /**
 560 * Log management system; creates a complex list
 561 * of SVN log information
 562 *
 563 * @package      ViewSVN
 564 * @version      $Id$
 565 */
 566 class SVNLog
 567 {
 568         /**
 569         * Array of logs
 570         * @var  array
 571         */
 572         var $logs = array();
 573
 574         /**
 575         * Raw "svn log" output
 576         * @var  array
 577         */
 578         var $rawoutput;
 579
 580         /**
 581         * Constructor: create log store for the given file
 582         *
 583         * @param        string  Repository
 584         * @param        string  Path
 585         * @param        integer Lower revision
 586         * @param        integer Higher revision
 587         */
 588         function SVNLog($repos, $path, $lorev, $hirev)
 589         {
 590                 global $viewsvn;
 591
 592                 $this->rawoutput = $viewsvn->svn->log($repos, $path, $lorev, $hirev);
 593                 $this->process();
 594         }
 595
 596         /**
 597         * Returns logs for display
 598         *
 599         * @access       public
 600         *
 601         * @return       array   Log data
 602         */
 603         function fetch()
 604         {
 605                 return $this->logs;
 606         }
 607
 608         /**
 609         * Splits up the raw output into a usable log
 610         *
 611         * @access       private
 612         */
 613         function process()
 614         {
 615                 $lastrev = 0;
 616
 617                 for ($i = 1; $i <= count($this->rawoutput) - 1; $i++)
 618                 {
 619                         $line = $this->rawoutput["$i"];
 620
 621                         if (preg_match('#^r([0-9]*) \| (.*?) \| (....-..-.. ..:..:..) ([0-9\-]*) \((.*?)\) \| ([0-9]*) lines?$#', $line, $matches))
 622                         {
 623                                 if (isset($this->logs["$lastrev"]))
 624                                 {
 625                                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 626                                 }
 627
 628                                 $this->logs["$matches[1]"] = array(
 629                                         'rev'           => $matches[1],
 630                                         'author'        => $matches[2],
 631                                         'date'          => $matches[3],
 632                                         'timezone'      => $matches[4],
 633                                         'lines'         => $matches[6],
 634                                         'message'       => ''
 635                                 );
 636
 637                                 $lastrev = $matches[1];
 638                         }
 639                         else if (preg_match('#^\s+([ADM])\s(.*)#', $line, $matches))
 640                         {
 641                                 $this->logs["$lastrev"]['files'][] = array(
 642                                         'action'        => $matches[1],
 643                                         'file'          => $matches[2]
 644                                 );
 645                         }
 646                         else
 647                         {
 648                                 if (trim($line) != 'Changed paths:')
 649                                 {
 650                                         $this->logs["$lastrev"]['message'] .= $line . "\n";
 651                                 }
 652                         }
 653                 }
 654
 655                 if (isset($this->logs["$lastrev"]))
 656                 {
 657                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 658                 }
 659         }
 660
 661         /**
 662         * Trims the last dash line off a message
 663         *
 664         * @access       private
 665         *
 666         * @param        string  Message with annoying-ass line
 667         *
 668         * @return       string  Clean string
 669         */
 670         function strip_last_line($string)
 671         {
 672                 return trim(preg_replace("#\n(.*?)\n$#", '', $string));
 673         }
 674 }
 675
 676 /**
 677 * Diff system; constructs a diff array that
 678 * is ready for output
 679 *
 680 * @package      ViewSVN
 681 */
 682 class SVNDiff
 683 {
 684         /**
 685         * Array of diff information
 686         * @var  array
 687         */
 688         var $diff = array();
 689
 690         /**
 691         * Raw "svn diff" output
 692         * @var  array
 693         */
 694         var $rawoutput;
 695
 696         /**
 697         * Constructor: create and store diff data
 698         *
 699         * @param        string  Repository
 700         * @param        string  Path
 701         * @param        integer Lower revision
 702         * @param        integer Higher revision
 703         */
 704         function SVNDiff($repos, $path, $lorev, $hirev)
 705         {
 706                 global $viewsvn;
 707
 708                 $this->rawoutput = $viewsvn->svn->diff($repos, $path, $lorev, $hirev);
 709                 $this->process();
 710         }
 711
 712         /**
 713         * Returns diffs for display
 714         *
 715         * @access       public
 716         *
 717         * @return       array   Diff data
 718         */
 719         function fetch()
 720         {
 721                 return $this->diff;
 722         }
 723
 724         /**
 725         * Processes and prepares diff data
 726         *
 727         * @access       private
 728         */
 729         function process()
 730         {
 731                 $chunk = 0;
 732                 $indexcounter = null;
 733
 734                 $lastact = '';
 735                 $lastcontent = '';
 736
 737                 foreach ($this->rawoutput AS $line)
 738                 {
 739                         if (preg_match('#^@@ \-([0-9]*),([0-9]*) \+([0-9]*),([0-9]*) @@$#', $line, $bits))
 740                         {
 741                                 $lastact = '';
 742                                 $lastcontent = '';
 743
 744                                 $this->diff["$index"][ ++$chunk ]['hunk'] = array('old' => array('line' => $bits[1], 'count' => $bits[2]), 'new' => array('line' => $bits[3], 'count' => $bits[4]));
 745                                 $lines['old'] = $this->diff["$index"]["$chunk"]['hunk']['old']['line'] - 1;
 746                                 $lines['new'] = $this->diff["$index"]["$chunk"]['hunk']['new']['line'] - 1;
 747                                 continue;
 748                         }
 749
 750                         if ($indexcounter <= 5 AND $indexcounter !== null)
 751                         {
 752                                 $indexcounter++;
 753                                 continue;
 754                         }
 755                         else if ($indexcounter == 5)
 756                         {
 757                                 $indexcounter = null;
 758                                 continue;
 759                         }
 760
 761                         if (preg_match('#^([\+\- ])(.*)#', $line, $matches))
 762                         {
 763                                 $act = $matches[1];
 764                                 $content = $matches[2];
 765
 766                                 if ($act == ' ')
 767                                 {
 768                                         $this->diff["$index"]["$chunk"][] = array(
 769                                                 'line'          => $content,
 770                                                 'act'           => '',
 771                                                 'oldlineno'     => ++$lines['old'],
 772                                                 'newlineno'     => ++$lines['new']
 773                                         );
 774                                 }
 775                                 else if ($act == '+')
 776                                 {
 777                                         // potential line delta
 778                                         if ($lastact == '-')
 779                                         {
 780                                                 if ($delta = @$this->fetch_diff_extent($lastcontent, $content))
 781                                                 {
 782                                                         // create two sets of ends for the two contents
 783                                                         $delta['endo'] = strlen($lastcontent) - $delta['end'];
 784                                                         $delta['endn'] = strlen($content) - $delta['end'];
 785
 786                                                         $diffo = $delta['endo'] - $delta['start'];
 787                                                         $diffn = $delta['endn'] - $delta['start'];
 788
 789                                                         if (strlen($lastcontent) > $delta['endo'] - $diffo)
 790                                                         {
 791                                                                 $removed = substr($lastcontent, $delta['start'], $diffo);
 792                                                                 $this->diff["$index"]["$chunk"][ count($this->diff["$index"]["$chunk"]) - 2 ]['line'] = substr_replace($lastcontent, '{@--}' . $removed . '{/@--}', $delta['start'], $diffo);
 793                                                         }
 794
 795                                                         if (strlen($content) > $delta['endn'] - $diffn)
 796                                                         {
 797                                                                 $added = substr($content, $delta['start'], $diffn);
 798                                                                 $content = substr_replace($content, '{@++}' . $added . '{/@++}', $delta['start'], $diffn);
 799                                                         }
 800                                                 }
 801                                         }
 802
 803                                         $this->diff["$index"]["$chunk"][] = array(
 804                                                 'line'          => $content,
 805                                                 'act'           => '+',
 806                                                 'oldlineno'     => '',
 807                                                 'newlineno'     => ++$lines['new']
 808                                         );
 809                                 }
 810                                 else if ($act == '-')
 811                                 {
 812                                         $lastcontent = $content;
 813
 814                                         $this->diff["$index"]["$chunk"][] = array(
 815                                                 'line'          => $content,
 816                                                 'act'           => '-',
 817                                                 'oldlineno'     => ++$lines['old'],
 818                                                 'newlineno'     => ''
 819                                         );
 820                                 }
 821
 822                                 $lastact = $act;
 823                         }
 824                         // whitespace lines
 825                         else
 826                         {
 827                                 if (preg_match('#^Index: (.*?)$#', $line, $matches))
 828                                 {
 829                                         $index = $matches[1];
 830                                         $indexcounter = 1;
 831                                         $chunk = 0;
 832                                         continue;
 833                                 }
 834
 835                                 $lastact = '';
 836
 837                                 $this->diff["$index"]["$chunk"][] = array(
 838                                         'line'          => '',
 839                                         'act'           => '',
 840                                         'oldlineno'     => ++$lines['old'],
 841                                         'newlineno'     => ++$lines['new']
 842                                 );
 843                         }
 844                 }
 845         }
 846
 847         /**
 848         * Returns the amount of change that occured
 849         * between two lines
 850         *
 851         * @access       private
 852         *
 853         * @param        string  Old line
 854         * @param        string  New line
 855         *
 856         * @return       array   Difference of positions
 857         */
 858         function fetch_diff_extent($old, $new)
 859         {
 860                 $start = 0;
 861                 $min = min(strlen($old), strlen($new));
 862
 863                 for ($start = 0; $start < $min; $start++)
 864                 {
 865                         if ($old{"$start"} != $new{"$start"})
 866                         {
 867                                 break;
 868                         }
 869                 }
 870
 871                 $max = max(strlen($old), strlen($new));
 872
 873                 for ($end = 0; $end < $min; $end++)
 874                 {
 875                         $oldpos = strlen($old) - $end;
 876                         $newpos = strlen($new) - $end;
 877
 878                         if ($old{"$oldpos"} != $new{"$newpos"})
 879                         {
 880                                 break;
 881                         }
 882                 }
 883
 884                 $end--;
 885
 886                 if ($start == 0 AND $end == $max)
 887                 {
 888                         return false;
 889                 }
 890
 891                 return array('start' => $start, 'end' => $end);
 892         }
 893 }
 894
 895 /*=====================================================================*\
 896 || ###################################################################
 897 || # $HeadURL$
 898 || # $Id$
 899 || ###################################################################
 900 \*=====================================================================*/
 901 ?>