functions/strings.php

   1 <?php
   2
   3 /**
   4  * strings.php
   5  *
   6  * Copyright (c) 1999-2002 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This code provides various string manipulation functions that are
  10  * used by the rest of the Squirrelmail code.
  11  *
  12  * $Id$
  13  */
  14
  15 /**
  16  * SquirrelMail version number -- DO NOT CHANGE
  17  */
  18 global $version;
  19 $version = '1.2.6 [cvs]';
  20
  21 /**
  22  * If $haystack is a full mailbox name and $needle is the mailbox
  23  * separator character, returns the last part of the mailbox name.
  24  */
  25 function readShortMailboxName($haystack, $needle) {
  26     if ($needle == '') {
  27         return $haystack;
  28     }
  29     $parts = explode($needle, $haystack);
  30     $elem = array_pop($parts);
  31     while ($elem == '' && count($parts)) {
  32         $elem = array_pop($parts);
  33     }
  34     return $elem;
  35 }
  36
  37 /**
  38  * If $haystack is a full mailbox name, and $needle is the mailbox
  39  * separator character, returns the second last part of the full
  40  * mailbox name (i.e. the mailbox's parent mailbox)
  41  */
  42 function readMailboxParent($haystack, $needle) {
  43     if ($needle == '') return '';
  44     $parts = explode($needle, $haystack);
  45     $elem = array_pop($parts);
  46     while ($elem == '' && count($parts)) {
  47         $elem = array_pop($parts);
  48     }
  49     return join($needle, $parts);
  50 }
  51
  52 /**
  53  * Returns the index of the first chunk of string $haystack that
  54  * starts with non-white-space character, starting at position $pos.
  55  * If there is no such chunk, returns -1.
  56  */
  57 function next_pos_minus_white ($haystack, $pos) {
  58     $len = strlen($haystack);
  59     while ($pos < $len) {
  60         /* Get the next character. */
  61         $c = substr($haystack, $pos, 1);
  62
  63         /* Check the next character. */
  64         if (($c != ' ') && ($c != "\t") && ($c != "\n") && ($c != "\r")) {
  65             return $pos;
  66         }
  67
  68         /* Increment position in string. */
  69         ++$pos;
  70     }
  71     return -1;
  72 }
  73
  74 /**
  75  * Wraps text at $wrap characters
  76  *
  77  * Has a problem with special HTML characters, so call this before
  78  * you do character translation.
  79  *
  80  * Specifically, &#039 comes up as 5 characters instead of 1.
  81  * This should not add newlines to the end of lines.
  82  */
  83 function sqWordWrap(&$line, $wrap) {
  84     ereg("^([\t >]*)([^\t >].*)?$", $line, $regs);
  85     $beginning_spaces = $regs[1];
  86     if (isset($regs[2])) {
  87         $words = explode(' ', $regs[2]);
  88     } else {
  89         $words = '';
  90     }
  91
  92     $i = 0;
  93     $line = $beginning_spaces;
  94
  95     while ($i < count($words)) {
  96         /* Force one word to be on a line (minimum) */
  97         $line .= $words[$i];
  98         $line_len = strlen($beginning_spaces) + strlen($words[$i]) + 2;
  99         if (isset($words[$i + 1]))
 100             $line_len += strlen($words[$i + 1]);
 101         $i ++;
 102
 103         /* Add more words (as long as they fit) */
 104         while ($line_len < $wrap && $i < count($words)) {
 105             $line .= ' ' . $words[$i];
 106             $i++;
 107             if (isset($words[$i]))
 108                 $line_len += strlen($words[$i]) + 1;
 109             else
 110                 $line_len += 1;
 111         }
 112
 113         /* Skip spaces if they are the first thing on a continued line */
 114         while (!isset($words[$i]) && $i < count($words)) {
 115             $i ++;
 116         }
 117
 118         /* Go to the next line if we have more to process */
 119         if ($i < count($words)) {
 120             $line .= "\n" . $beginning_spaces;
 121         }
 122     }
 123 }
 124
 125
 126 /**
 127  * Does the opposite of sqWordWrap()
 128  */
 129 function sqUnWordWrap(&$body) {
 130     $lines = explode("\n", $body);
 131     $body = '';
 132     $PreviousSpaces = '';
 133     for ($i = 0; $i < count($lines); $i ++) {
 134         ereg("^([\t >]*)([^\t >].*)?$", $lines[$i], $regs);
 135         $CurrentSpaces = $regs[1];
 136         if (isset($regs[2])) {
 137             $CurrentRest = $regs[2];
 138         }
 139
 140         if ($i == 0) {
 141             $PreviousSpaces = $CurrentSpaces;
 142             $body = $lines[$i];
 143         } else if (($PreviousSpaces == $CurrentSpaces) /* Do the beginnings match */
 144                    && (strlen($lines[$i - 1]) > 65)    /* Over 65 characters long */
 145                    && strlen($CurrentRest)) {          /* and there's a line to continue with */
 146             $body .= ' ' . $CurrentRest;
 147         } else {
 148             $body .= "\n" . $lines[$i];
 149             $PreviousSpaces = $CurrentSpaces;
 150         }
 151     }
 152     $body .= "\n";
 153 }
 154
 155
 156 /**
 157  * Returns an array of email addresses.
 158  * Be cautious of "user@host.com"
 159  */
 160 function parseAddrs($text) {
 161     if (trim($text) == '')
 162         return array();
 163     $text = str_replace(' ', '', $text);
 164     $text = ereg_replace('"[^"]*"', '', $text);
 165     $text = ereg_replace('\\([^\\)]*\\)', '', $text);
 166     $text = str_replace(',', ';', $text);
 167     $array = explode(';', $text);
 168     for ($i = 0; $i < count ($array); $i++) {
 169         $array[$i] = eregi_replace ('^.*[<]', '', $array[$i]);
 170         $array[$i] = eregi_replace ('[>].*$', '', $array[$i]);
 171     }
 172     return $array;
 173 }
 174
 175 /**
 176  * Returns a line of comma separated email addresses from an array.
 177  */
 178 function getLineOfAddrs($array) {
 179     if (is_array($array)) {
 180         $to_line = implode(', ', $array);
 181         $to_line = ereg_replace(', (, )+', ', ', $to_line);
 182         $to_line = trim(ereg_replace('^, ', '', $to_line));
 183         if( substr( $to_line, -1 ) == ',' )
 184             $to_line = substr( $to_line, 0, -1 );
 185     } else {
 186         $to_line = '';
 187     }
 188
 189     return( $to_line );
 190 }
 191
 192 function translateText(&$body, $wrap_at, $charset) {
 193     global $where, $what; /* from searching */
 194     global $color; /* color theme */
 195
 196     require_once('../functions/url_parser.php');
 197
 198     $body_ary = explode("\n", $body);
 199     $PriorQuotes = 0;
 200     for ($i=0; $i < count($body_ary); $i++) {
 201         $line = $body_ary[$i];
 202         if (strlen($line) - 2 >= $wrap_at) {
 203             sqWordWrap($line, $wrap_at);
 204         }
 205         $line = charset_decode($charset, $line);
 206         $line = str_replace("\t", '        ', $line);
 207
 208         parseUrl ($line);
 209
 210         $Quotes = 0;
 211         $pos = 0;
 212         $j = strlen( $line );
 213
 214         while ( $pos < $j ) {
 215             if ($line[$pos] == ' ') {
 216                 $pos ++;
 217             } else if (strpos($line, '&gt;', $pos) === $pos) {
 218                 $pos += 4;
 219                 $Quotes ++;
 220             } else {
 221                 break;
 222             }
 223         }
 224
 225         if ($Quotes > 1) {
 226             if (! isset($color[14])) {
 227                 $color[14] = '#FF0000';
 228             }
 229             $line = '<FONT COLOR="' . $color[14] . '">' . $line . '</FONT>';
 230         } elseif ($Quotes) {
 231             if (! isset($color[13])) {
 232                 $color[13] = '#800000';
 233             }
 234             $line = '<FONT COLOR="' . $color[13] . '">' . $line . '</FONT>';
 235         }
 236
 237         $body_ary[$i] = $line;
 238     }
 239     $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
 240 }
 241
 242 function find_mailbox_name ($mailbox) {
 243     if (ereg(" *\"([^\r\n\"]*)\"[ \r\n]*$", $mailbox, $regs))
 244         return $regs[1];
 245     ereg(" *([^ \r\n\"]*)[ \r\n]*$",$mailbox,$regs);
 246     return $regs[1];
 247
 248 }
 249
 250 function php_self () {
 251     global $PHP_SELF, $HTTP_SERVER_VARS;
 252
 253     if (isset($HTTP_SERVER_VARS['REQUEST_URI']) && !empty($HTTP_SERVER_VARS['REQUEST_URI']) ) {
 254         return $HTTP_SERVER_VARS['REQUEST_URI'];
 255     }
 256
 257     if (isset($PHP_SELF) && !empty($PHP_SELF)) {
 258         return $PHP_SELF;
 259     } else if (isset($HTTP_SERVER_VARS['PHP_SELF']) &&
 260                !empty($HTTP_SERVER_VARS['PHP_SELF'])) {
 261         return $HTTP_SERVER_VARS['PHP_SELF'];
 262     } else {
 263         return '';
 264     }
 265 }
 266
 267
 268 /**
 269  * This determines the location to forward to relative to your server.
 270  * If this doesnt work correctly for you (although it should), you can
 271  * remove all this code except the last two lines, and change the header()
 272  * function to look something like this, customized to the location of
 273  * SquirrelMail on your server:
 274  *
 275  *   http://www.myhost.com/squirrelmail/src/login.php
 276  */
 277 function get_location () {
 278
 279     global $PHP_SELF, $SERVER_NAME, $HTTP_HOST, $SERVER_PORT,
 280         $HTTP_SERVER_VARS;
 281
 282     /* Get the path, handle virtual directories */
 283     $path = substr(php_self(), 0, strrpos(php_self(), '/'));
 284
 285     /* Check if this is a HTTPS or regular HTTP request. */
 286     $proto = 'http://';
 287
 288     /*
 289      * If you have 'SSLOptions +StdEnvVars' in your apache config
 290      *     OR if you have HTTPS in your HTTP_SERVER_VARS
 291      *     OR if you are on port 443
 292      */
 293     $getEnvVar = getenv('HTTPS');
 294     if ((isset($getEnvVar) && !strcasecmp($getEnvVar, 'on')) ||
 295         (isset($HTTP_SERVER_VARS['HTTPS'])) ||
 296         (isset($HTTP_SERVER_VARS['SERVER_PORT']) &&
 297          $HTTP_SERVER_VARS['SERVER_PORT'] == 443)) {
 298         $proto = 'https://';
 299     }
 300
 301     /* Get the hostname from the Host header or server config. */
 302     $host = '';
 303     if (isset($HTTP_HOST) && !empty($HTTP_HOST)) {
 304         $host = $HTTP_HOST;
 305     } else if (isset($SERVER_NAME) && !empty($SERVER_NAME)) {
 306         $host = $SERVER_NAME;
 307     } else if (isset($HTTP_SERVER_VARS['SERVER_NAME']) &&
 308                !empty($HTTP_SERVER_VARS['SERVER_NAME'])) {
 309         $host = $HTTP_SERVER_VARS['SERVER_NAME'];
 310     }
 311
 312
 313     $port = '';
 314     if (! strstr($host, ':')) {
 315         if (isset($SERVER_PORT)) {
 316             if (($SERVER_PORT != 80 && $proto == 'http://')
 317                 || ($SERVER_PORT != 443 && $proto == 'https://')) {
 318                 $port = sprintf(':%d', $SERVER_PORT);
 319             }
 320         }
 321     }
 322
 323     /* Fallback is to omit the server name and use a relative */
 324     /* URI, although this is not RFC 2616 compliant.          */
 325     return ($host ? $proto . $host . $port . $path : $path);
 326 }
 327
 328
 329 /**
 330  * These functions are used to encrypt the passowrd before it is
 331  * stored in a cookie.
 332  */
 333 function OneTimePadEncrypt ($string, $epad) {
 334     $pad = base64_decode($epad);
 335     $encrypted = '';
 336     for ($i = 0; $i < strlen ($string); $i++) {
 337         $encrypted .= chr (ord($string[$i]) ^ ord($pad[$i]));
 338     }
 339
 340     return base64_encode($encrypted);
 341 }
 342
 343 function OneTimePadDecrypt ($string, $epad) {
 344     $pad = base64_decode($epad);
 345     $encrypted = base64_decode ($string);
 346     $decrypted = '';
 347     for ($i = 0; $i < strlen ($encrypted); $i++) {
 348         $decrypted .= chr (ord($encrypted[$i]) ^ ord($pad[$i]));
 349     }
 350
 351     return $decrypted;
 352 }
 353
 354
 355 /**
 356  * Randomize the mt_rand() function.  Toss this in strings or integers
 357  * and it will seed the generator appropriately. With strings, it is
 358  * better to get them long. Use md5() to lengthen smaller strings.
 359  */
 360 function sq_mt_seed($Val) {
 361     /* if mt_getrandmax() does not return a 2^n - 1 number,
 362        this might not work well.  This uses $Max as a bitmask. */
 363     $Max = mt_getrandmax();
 364
 365     if (! is_int($Val)) {
 366         if (function_exists('crc32')) {
 367             $Val = crc32($Val);
 368         } else {
 369             $Str = $Val;
 370             $Pos = 0;
 371             $Val = 0;
 372             $Mask = $Max / 2;
 373             $HighBit = $Max ^ $Mask;
 374             while ($Pos < strlen($Str)) {
 375                 if ($Val & $HighBit) {
 376                     $Val = (($Val & $Mask) << 1) + 1;
 377                 } else {
 378                     $Val = ($Val & $Mask) << 1;
 379                 }
 380                 $Val ^= $Str[$Pos];
 381                 $Pos ++;
 382             }
 383         }
 384     }
 385
 386     if ($Val < 0) {
 387         $Val *= -1;
 388     }
 389
 390     if ($Val = 0) {
 391         return;
 392     }
 393
 394     mt_srand(($Val ^ mt_rand(0, $Max)) & $Max);
 395 }
 396
 397
 398 /**
 399  * This function initializes the random number generator fairly well.
 400  * It also only initializes it once, so you don't accidentally get
 401  * the same 'random' numbers twice in one session.
 402  */
 403 function sq_mt_randomize() {
 404     global $REMOTE_PORT, $REMOTE_ADDR, $UNIQUE_ID;
 405     static $randomized;
 406
 407     if ($randomized) {
 408         return;
 409     }
 410
 411     /* Global. */
 412     sq_mt_seed((int)((double) microtime() * 1000000));
 413     sq_mt_seed(md5($REMOTE_PORT . $REMOTE_ADDR . getmypid()));
 414
 415     /* getrusage */
 416     if (function_exists('getrusage')) {
 417         /* Avoid warnings with Win32 */
 418         $dat = @getrusage();
 419         if (isset($dat) && is_array($dat)) {
 420             $Str = '';
 421             foreach ($dat as $k => $v)
 422                 {
 423                     $Str .= $k . $v;
 424                 }
 425             sq_mt_seed(md5($Str));
 426         }
 427     }
 428
 429     /* Apache-specific */
 430     sq_mt_seed(md5($UNIQUE_ID));
 431
 432     $randomized = 1;
 433 }
 434
 435 function OneTimePadCreate ($length=100) {
 436     sq_mt_randomize();
 437
 438     $pad = '';
 439     for ($i = 0; $i < $length; $i++) {
 440         $pad .= chr(mt_rand(0,255));
 441     }
 442
 443     return base64_encode($pad);
 444 }
 445
 446 /**
 447  * Check if we have a required PHP-version. Return TRUE if we do,
 448  * or FALSE if we don't.
 449  *
 450  *     To check for 4.0.1, use sqCheckPHPVersion(4,0,1)
 451  *     To check for 4.0b3, use sqCheckPHPVersion(4,0,-3)
 452  *
 453  * Does not handle betas like 4.0.1b1 or development versions
 454  */
 455 function sqCheckPHPVersion($major, $minor, $release) {
 456
 457     $ver = phpversion();
 458     eregi('^([0-9]+)\\.([0-9]+)(.*)', $ver, $regs);
 459
 460     /* Parse the version string. */
 461     $vmajor  = strval($regs[1]);
 462     $vminor  = strval($regs[2]);
 463     $vrel    = $regs[3];
 464     if($vrel[0] == '.') {
 465         $vrel = strval(substr($vrel, 1));
 466     }
 467     if($vrel[0] == 'b' || $vrel[0] == 'B') {
 468         $vrel = - strval(substr($vrel, 1));
 469     }
 470     if($vrel[0] == 'r' || $vrel[0] == 'R') {
 471         $vrel = - strval(substr($vrel, 2))/10;
 472     }
 473
 474     /* Compare major version. */
 475     if ($vmajor < $major) { return false; }
 476     if ($vmajor > $major) { return true; }
 477
 478     /* Major is the same. Compare minor. */
 479     if ($vminor < $minor) { return false; }
 480     if ($vminor > $minor) { return true; }
 481
 482     /* Major and minor is the same as the required one. Compare release */
 483     if ($vrel >= 0 && $release >= 0) {       /* Neither are beta */
 484         if($vrel < $release) return false;
 485     } else if($vrel >= 0 && $release < 0) {  /* This is not beta, required is beta */
 486         return true;
 487     } else if($vrel < 0 && $release >= 0){   /* This is beta, require not beta */
 488         return false;
 489     } else {                                 /* Both are beta */
 490         if($vrel > $release) return false;
 491     }
 492
 493     return true;
 494 }
 495
 496 /**
 497  *  Returns a string showing the size of the message/attachment.
 498  */
 499 function show_readable_size($bytes) {
 500     $bytes /= 1024;
 501     $type = 'k';
 502
 503     if ($bytes / 1024 > 1) {
 504         $bytes /= 1024;
 505         $type = 'm';
 506     }
 507
 508     if ($bytes < 10) {
 509         $bytes *= 10;
 510         settype($bytes, 'integer');
 511         $bytes /= 10;
 512     } else {
 513         settype($bytes, 'integer');
 514     }
 515
 516     return $bytes . '<small>&nbsp;' . $type . '</small>';
 517 }
 518
 519 /**
 520  * Generates a random string from the caracter set you pass in
 521  *
 522  * Flags:
 523  *   1 = add lowercase a-z to $chars
 524  *   2 = add uppercase A-Z to $chars
 525  *   4 = add numbers 0-9 to $chars
 526  */
 527
 528 function GenerateRandomString($size, $chars, $flags = 0) {
 529     if ($flags & 0x1) {
 530         $chars .= 'abcdefghijklmnopqrstuvwxyz';
 531     }
 532     if ($flags & 0x2) {
 533         $chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 534     }
 535     if ($flags & 0x4) {
 536         $chars .= '0123456789';
 537     }
 538
 539     if (($size < 1) || (strlen($chars) < 1)) {
 540         return '';
 541     }
 542
 543     sq_mt_randomize(); /* Initialize the random number generator */
 544
 545     $String = '';
 546     $j = strlen( $chars ) - 1;
 547     while (strlen($String) < $size) {
 548         $String .= $chars{mt_rand(0, $j)};
 549     }
 550
 551     return $String;
 552 }
 553
 554 function quoteIMAP($str) {
 555     return ereg_replace('(["\\])', '\\\\1', $str);
 556 }
 557
 558 /**
 559  * Trims every element in the array
 560  */
 561 function TrimArray(&$array) {
 562     foreach ($array as $k => $v) {
 563         global $$k;
 564         if (is_array($$k)) {
 565             foreach ($$k as $k2 => $v2) {
 566                 $$k[$k2] = substr($v2, 1);
 567             }
 568         } else {
 569             $$k = substr($v, 1);
 570         }
 571
 572         /* Re-assign back to array. */
 573         $array[$k] = $$k;
 574     }
 575 }
 576
 577 /**
 578  * Removes slashes from every element in the array
 579  */
 580 function RemoveSlashes(&$array) {
 581     foreach ($array as $k => $v) {
 582         global $$k;
 583         if (is_array($$k)) {
 584             foreach ($$k as $k2 => $v2) {
 585                 $newArray[stripslashes($k2)] = stripslashes($v2);
 586             }
 587             $$k = $newArray;
 588         } else {
 589             $$k = stripslashes($v);
 590         }
 591
 592         /* Re-assign back to the array. */
 593         $array[$k] = $$k;
 594     }
 595 }
 596
 597 $PHP_SELF = php_self();
 598
 599 ?>