functions/strings.php

   1 <?php
   2
   3    /* $Id$ */
   4
   5    if (defined('strings_php'))
   6        return;
   7    define('strings_php', true);
   8
   9
  10    //*************************************************************************
  11    // Count the number of occurances of $needle are in $haystack.
  12    // $needle can be a character or string, and need not occur in $haystack
  13    //*************************************************************************
  14    function countCharInString($haystack, $needle) {
  15       if ($needle == '') return 0;
  16       return count(explode($needle, $haystack));
  17    }
  18
  19    //*************************************************************************
  20    // Read from the back of $haystack until $needle is found, or the begining
  21    //    of the $haystack is reached.  $needle is a single character
  22    //*************************************************************************
  23    function readShortMailboxName($haystack, $needle) {
  24       if ($needle == '') return $haystack;
  25       $parts = explode($needle, $haystack);
  26       $elem = array_pop($parts);
  27       while ($elem == '' && count($parts))
  28       {
  29           $elem = array_pop($parts);
  30       }
  31       return $elem;
  32    }
  33
  34    //*************************************************************************
  35    // Read from the back of $haystack until $needle is found, or the begining
  36    //    of the $haystack is reached.  $needle is a single character
  37    //*************************************************************************
  38    function readMailboxParent($haystack, $needle) {
  39       if ($needle == '') return '';
  40       $parts = explode($needle, $haystack);
  41       $elem = array_pop($parts);
  42       while ($elem == '' && count($parts))
  43       {
  44           $elem = array_pop($parts);
  45       }
  46       return join($needle, $parts);
  47    }
  48
  49    // Searches for the next position in a string minus white space
  50    function next_pos_minus_white ($haystack, $pos) {
  51       while (substr($haystack, $pos, 1) == ' ' ||
  52              substr($haystack, $pos, 1) == "\t" ||
  53              substr($haystack, $pos, 1) == "\n" ||
  54              substr($haystack, $pos, 1) == "\r") {
  55          if ($pos >= strlen($haystack))
  56             return -1;
  57          $pos++;
  58       }
  59       return $pos;
  60    }
  61
  62    // Wraps text at $wrap characters
  63    // Has a problem with special HTML characters, so call this before
  64    // you do character translation.
  65    // Specifically, &#039 comes up as 5 characters instead of 1.
  66    // This should not add newlines to the end of lines.
  67    function sqWordWrap(&$line, $wrap) {
  68       ereg("^([\t >]*)([^\t >].*)?$", $line, $regs);
  69       $beginning_spaces = $regs[1];
  70            if (isset($regs[2])) {
  71          $words = explode(' ', $regs[2]);
  72       } else {
  73          $words = "";
  74            }
  75
  76       $i = 0;
  77       $line = $beginning_spaces;
  78
  79       while ($i < count($words)) {
  80          // Force one word to be on a line (minimum)
  81          $line .= $words[$i];
  82          $line_len = strlen($beginning_spaces) + strlen($words[$i]) + 2;
  83           if (isset($words[$i + 1]))
  84               $line_len += strlen($words[$i + 1]);
  85          $i ++;
  86
  87          // Add more words (as long as they fit)
  88          while ($line_len < $wrap && $i < count($words)) {
  89             $line .= ' ' . $words[$i];
  90             $i++;
  91              if (isset($words[$i]))
  92                 $line_len += strlen($words[$i]) + 1;
  93              else
  94                  $line_len += 1;
  95          }
  96
  97          // Skip spaces if they are the first thing on a continued line
  98          while (!isset($words[$i]) && $i < count($words)) {
  99             $i ++;
 100          }
 101
 102          // Go to the next line if we have more to process
 103          if ($i < count($words)) {
 104             $line .= "\n" . $beginning_spaces;
 105          }
 106       }
 107    }
 108
 109
 110    // Does the opposite of sqWordWrap()
 111    function sqUnWordWrap(&$body)
 112    {
 113        $lines = explode("\n", $body);
 114        $body = "";
 115        $PreviousSpaces = "";
 116        for ($i = 0; $i < count($lines); $i ++)
 117        {
 118            ereg("^([\t >]*)([^\t >].*)?$", $lines[$i], $regs);
 119            $CurrentSpaces = $regs[1];
 120             if (isset($regs[2]))
 121                $CurrentRest = $regs[2];
 122            if ($i == 0)
 123            {
 124                $PreviousSpaces = $CurrentSpaces;
 125                $body = $lines[$i];
 126            }
 127            else if ($PreviousSpaces == $CurrentSpaces &&  // Do the beginnings match
 128                strlen($lines[$i - 1]) > 65 &&             // Over 65 characters long
 129                strlen($CurrentRest))                      // and there's a line to continue with
 130            {
 131                $body .= ' ' . $CurrentRest;
 132            }
 133            else
 134            {
 135                $body .= "\n" . $lines[$i];
 136                $PreviousSpaces = $CurrentSpaces;
 137            }
 138        }
 139        $body .= "\n";
 140    }
 141
 142
 143    /** Returns an array of email addresses **/
 144    /* Be cautious of "user@host.com" */
 145    function parseAddrs($text) {
 146       if (trim($text) == "")
 147          return array();
 148       $text = str_replace(' ', '', $text);
 149       $text = ereg_replace('"[^"]*"', '', $text);
 150       $text = ereg_replace('\\([^\\)]*\\)', '', $text);
 151       $text = str_replace(',', ';', $text);
 152       $array = explode(';', $text);
 153       for ($i = 0; $i < count ($array); $i++) {
 154                                $array[$i] = eregi_replace ("^.*[<]", '', $array[$i]);
 155                                $array[$i] = eregi_replace ("[>].*$", '', $array[$i]);
 156                     }
 157       return $array;
 158    }
 159
 160    /** Returns a line of comma separated email addresses from an array **/
 161    function getLineOfAddrs($array) {
 162       if (is_array($array)) {
 163         $to_line = implode(', ', $array);
 164         $to_line = trim(ereg_replace(', (, )+', ', ', $to_line));
 165       } else {
 166         $to_line = '';
 167       }
 168       return $to_line;
 169    }
 170
 171    function translateText(&$body, $wrap_at, $charset) {
 172       global $where, $what; // from searching
 173
 174       include '../functions/url_parser.php';
 175
 176       $body_ary = explode("\n", $body);
 177       $PriorQuotes = 0;
 178       for ($i=0; $i < count($body_ary); $i++) {
 179          $line = $body_ary[$i];
 180          if (strlen($line) - 2 >= $wrap_at) {
 181             sqWordWrap($line, $wrap_at);
 182          }
 183          $line = charset_decode($charset, $line);
 184          $line = str_replace("\t", '        ', $line);
 185
 186          parseUrl ($line);
 187
 188          $Quotes = 0;
 189          $pos = 0;
 190          while (1)
 191          {
 192              if ($line[$pos] == ' ')
 193              {
 194                 $pos ++;
 195              }
 196              else if (strpos($line, '&gt;', $pos) === $pos)
 197              {
 198                 $pos += 4;
 199                 $Quotes ++;
 200              }
 201              else
 202              {
 203                  break;
 204              }
 205          }
 206
 207          if ($Quotes > 1)
 208             $line = '<FONT COLOR="FF0000">'.$line.'</FONT>';
 209          elseif ($Quotes)
 210             $line = '<FONT COLOR="800000">'.$line.'</FONT>';
 211
 212          $body_ary[$i] = $line;
 213       }
 214       $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
 215    }
 216
 217    /* SquirrelMail version number -- DO NOT CHANGE */
 218    global $version;
 219    $version = '1.1.3 [cvs]';
 220
 221
 222    function find_mailbox_name ($mailbox) {
 223       if (ereg(" *\"([^\r\n\"]*)\"[ \r\n]*$", $mailbox, $regs))
 224           return $regs[1];
 225       ereg(" *([^ \r\n\"]*)[ \r\n]*$",$mailbox,$regs);
 226       return $regs[1];
 227
 228    }
 229
 230    function get_location () {
 231       # This determines the location to forward to relative
 232       # to your server.  If this doesnt work correctly for
 233       # you (although it should), you can remove all this
 234       # code except the last two lines, and change the header()
 235       # function to look something like this, customized to
 236       # the location of SquirrelMail on your server:
 237       #
 238       #   http://www.myhost.com/squirrelmail/src/login.php
 239
 240       global $PHP_SELF, $SERVER_NAME, $HTTP_HOST, $SERVER_PORT,
 241          $HTTP_SERVER_VARS;
 242
 243       // Get the path
 244       $path = substr($PHP_SELF, 0, strrpos($PHP_SELF, '/'));
 245
 246       // Check if this is a HTTPS or regular HTTP request
 247       $proto = 'http://';
 248       // If you have 'SSLOptions +StdEnvVars' in your apache config
 249       // OR if you have HTTPS in your HTTP_SERVER_VARS
 250       // OR if you are on port 443
 251       $getEnvVar = getenv('HTTPS');
 252       if ((isset($getEnvVar) && !strcasecmp($getEnvVar, 'on')) ||
 253           (isset($HTTP_SERVER_VARS['HTTPS'])) ||
 254           (isset($HTTP_SERVER_VARS['SERVER_PORT']) &&
 255            $HTTP_SERVER_VARS['SERVER_PORT'] == 443)) {
 256         $proto = 'https://';
 257       }
 258
 259       // Get the hostname from the Host header or server config.
 260       $host = '';
 261       if (isset($HTTP_HOST) && !empty($HTTP_HOST))
 262       {
 263           $host = $HTTP_HOST;
 264       }
 265       else if (isset($SERVER_NAME) && !empty($SERVER_NAME))
 266       {
 267           $host = $SERVER_NAME;
 268       }
 269
 270       $port = '';
 271       if (! strstr($host, ':'))
 272       {
 273           if (isset($SERVER_PORT)) {
 274               if (($SERVER_PORT != 80 && $proto == 'http://')
 275                       || ($SERVER_PORT != 443 && $proto == 'https://')) {
 276                   $port = sprintf(':%d', $SERVER_PORT);
 277               }
 278           }
 279       }
 280
 281       if ($host)
 282           return $proto . $host . $port . $path;
 283
 284       // Fallback is to omit the server name and use a relative URI,
 285       // although this is not RFC 2616 compliant.
 286       return $path;
 287    }
 288
 289
 290    // These functions are used to encrypt the passowrd before it is
 291    // stored in a cookie.
 292    function OneTimePadEncrypt ($string, $epad) {
 293       $pad = base64_decode($epad);
 294       $encrypted = '';
 295       for ($i = 0; $i < strlen ($string); $i++) {
 296           $encrypted .= chr (ord($string[$i]) ^ ord($pad[$i]));
 297       }
 298
 299       return base64_encode($encrypted);
 300    }
 301
 302    function OneTimePadDecrypt ($string, $epad) {
 303       $pad = base64_decode($epad);
 304       $encrypted = base64_decode ($string);
 305       $decrypted = '';
 306       for ($i = 0; $i < strlen ($encrypted); $i++) {
 307           $decrypted .= chr (ord($encrypted[$i]) ^ ord($pad[$i]));
 308       }
 309
 310       return $decrypted;
 311    }
 312
 313
 314    // Randomize the mt_rand() function.  Toss this in strings or
 315    // integers and it will seed the generator appropriately.
 316    // With strings, it is better to get them long. Use md5() to
 317    // lengthen smaller strings.
 318    function sq_mt_seed($Val)
 319    {
 320        // if mt_getrandmax() does not return a 2^n - 1 number,
 321        // this might not work well.  This uses $Max as a bitmask.
 322        $Max = mt_getrandmax();
 323
 324        if (! is_int($Val))
 325        {
 326            if (function_exists('crc32'))
 327            {
 328                $Val = crc32($Val);
 329            }
 330            else
 331            {
 332                $Str = $Val;
 333                $Pos = 0;
 334                $Val = 0;
 335                $Mask = $Max / 2;
 336                $HighBit = $Max ^ $Mask;
 337                while ($Pos < strlen($Str))
 338                {
 339                    if ($Val & $HighBit)
 340                    {
 341                        $Val = (($Val & $Mask) << 1) + 1;
 342                    }
 343                    else
 344                    {
 345                        $Val = ($Val & $Mask) << 1;
 346                    }
 347                    $Val ^= $Str[$Pos];
 348                    $Pos ++;
 349                }
 350            }
 351        }
 352
 353        if ($Val < 0)
 354          $Val *= -1;
 355        if ($Val = 0)
 356          return;
 357
 358        mt_srand(($Val ^ mt_rand(0, $Max)) & $Max);
 359    }
 360
 361
 362    // This function initializes the random number generator fairly well.
 363    // It also only initializes it once, so you don't accidentally get
 364    // the same 'random' numbers twice in one session.
 365    function sq_mt_randomize()
 366    {
 367       global $REMOTE_PORT, $REMOTE_ADDR, $UNIQUE_ID;
 368       static $randomized;
 369
 370       if ($randomized)
 371          return;
 372
 373       // Global
 374       sq_mt_seed((int)((double) microtime() * 1000000));
 375       sq_mt_seed(md5($REMOTE_PORT . $REMOTE_ADDR . getmypid()));
 376
 377       // getrusage
 378       if (function_exists('getrusage')) {
 379          // Avoid warnings with Win32
 380          $dat = @getrusage();
 381          if (isset($dat) && is_array($dat))
 382          {
 383             $Str = '';
 384             foreach ($dat as $k => $v)
 385             {
 386                $Str .= $k . $v;
 387             }
 388             sq_mt_seed(md5($Str));
 389          }
 390       }
 391
 392       // Apache-specific
 393       sq_mt_seed(md5($UNIQUE_ID));
 394
 395       $randomized = 1;
 396    }
 397
 398    function OneTimePadCreate ($length=100) {
 399       sq_mt_randomize();
 400
 401       $pad = '';
 402       for ($i = 0; $i < $length; $i++) {
 403           $pad .= chr(mt_rand(0,255));
 404       }
 405
 406       return base64_encode($pad);
 407    }
 408
 409    // Check if we have a required PHP-version. Return TRUE if we do,
 410    // or FALSE if we don't.
 411    // To check for 4.0.1, use sqCheckPHPVersion(4,0,1)
 412    // To check for 4.0b3, use sqCheckPHPVersion(4,0,-3)
 413    // Does not handle betas like 4.0.1b1 or development versions
 414    function sqCheckPHPVersion($major, $minor, $release) {
 415
 416       $ver = phpversion();
 417       eregi('^([0-9]+)\\.([0-9]+)(.*)', $ver, $regs);
 418
 419       // Parse the version string
 420       $vmajor  = strval($regs[1]);
 421       $vminor  = strval($regs[2]);
 422       $vrel    = $regs[3];
 423       if($vrel[0] == ".")
 424           $vrel = strval(substr($vrel, 1));
 425       if($vrel[0] == 'b' || $vrel[0] == 'B')
 426           $vrel = - strval(substr($vrel, 1));
 427       if($vrel[0] == 'r' || $vrel[0] == 'R')
 428           $vrel = - strval(substr($vrel, 2))/10;
 429
 430       // Compare major version
 431       if($vmajor < $major) return false;
 432       if($vmajor > $major) return true;
 433
 434       // Major is the same. Compare minor
 435       if($vminor < $minor) return false;
 436       if($vminor > $minor) return true;
 437
 438       // Major and minor is the same as the required one.
 439       // Compare release
 440       if($vrel >= 0 && $release >= 0) {       // Neither are beta
 441           if($vrel < $release) return false;
 442       } else if($vrel >= 0 && $release < 0){  // This is not beta, required is beta
 443           return true;
 444       } else if($vrel < 0 && $release >= 0){  // This is beta, require not beta
 445           return false;
 446       } else {                                // Both are beta
 447           if($vrel > $release) return false;
 448       }
 449
 450       return true;
 451    }
 452
 453    /* Returns a string showing the size of the message/attachment */
 454    function show_readable_size($bytes)
 455    {
 456        $bytes /= 1024;
 457        $type = 'k';
 458
 459        if ($bytes / 1024 > 1)
 460        {
 461            $bytes /= 1024;
 462            $type = 'm';
 463        }
 464
 465        if ($bytes < 10)
 466        {
 467            $bytes *= 10;
 468            settype($bytes, 'integer');
 469            $bytes /= 10;
 470        }
 471        else
 472            settype($bytes, 'integer');
 473
 474        return $bytes . '<small>&nbsp;' . $type . '</small>';
 475    }
 476
 477    /* Generates a random string from the caracter set you pass in
 478     *
 479     * Flags:
 480     *   1 = add lowercase a-z to $chars
 481     *   2 = add uppercase A-Z to $chars
 482     *   4 = add numbers 0-9 to $chars
 483     */
 484
 485    function GenerateRandomString($size, $chars, $flags = 0)
 486    {
 487       if ($flags & 0x1)
 488           $chars .= 'abcdefghijklmnopqrstuvwxyz';
 489       if ($flags & 0x2)
 490           $chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 491       if ($flags & 0x4)
 492           $chars .= '0123456789';
 493
 494       if ($size < 1 || strlen($chars) < 1)
 495           return '';
 496
 497       sq_mt_randomize(); // Initialize the random number generator
 498
 499       $String = "";
 500       while (strlen($String) < $size) {
 501          $String .= $chars[mt_rand(0, strlen($chars))];
 502       }
 503
 504       return $String;
 505    }
 506
 507    function quoteIMAP($str)
 508    {
 509        return ereg_replace('(["\\])', '\\\\1', $str);
 510    }
 511
 512 ?>