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       global $color; // color theme
 174
 175       include '../functions/url_parser.php';
 176
 177       $body_ary = explode("\n", $body);
 178       $PriorQuotes = 0;
 179       for ($i=0; $i < count($body_ary); $i++) {
 180          $line = $body_ary[$i];
 181          if (strlen($line) - 2 >= $wrap_at) {
 182             sqWordWrap($line, $wrap_at);
 183          }
 184          $line = charset_decode($charset, $line);
 185          $line = str_replace("\t", '        ', $line);
 186
 187          parseUrl ($line);
 188
 189          $Quotes = 0;
 190          $pos = 0;
 191          while (1)
 192          {
 193              if ($line[$pos] == ' ')
 194              {
 195                 $pos ++;
 196              }
 197              else if (strpos($line, '&gt;', $pos) === $pos)
 198              {
 199                 $pos += 4;
 200                 $Quotes ++;
 201              }
 202              else
 203              {
 204                  break;
 205              }
 206          }
 207
 208          if ($Quotes > 1) {
 209             if (! isset($color[14]))
 210                $color[14] = '#FF0000';
 211             $line = '<FONT COLOR="' . $color[14] . '">' . $line . '</FONT>';
 212          } elseif ($Quotes) {
 213             if (! isset($color[13]))
 214                $color[13] = '#800000';
 215             $line = '<FONT COLOR="' . $color[13] . '">' . $line . '</FONT>';
 216          }
 217
 218          $body_ary[$i] = $line;
 219       }
 220       $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
 221    }
 222
 223    /* SquirrelMail version number -- DO NOT CHANGE */
 224    global $version;
 225    $version = '1.2.0 [rc1]';
 226
 227
 228    function find_mailbox_name ($mailbox) {
 229       if (ereg(" *\"([^\r\n\"]*)\"[ \r\n]*$", $mailbox, $regs))
 230           return $regs[1];
 231       ereg(" *([^ \r\n\"]*)[ \r\n]*$",$mailbox,$regs);
 232       return $regs[1];
 233
 234    }
 235
 236    function get_location () {
 237       # This determines the location to forward to relative
 238       # to your server.  If this doesnt work correctly for
 239       # you (although it should), you can remove all this
 240       # code except the last two lines, and change the header()
 241       # function to look something like this, customized to
 242       # the location of SquirrelMail on your server:
 243       #
 244       #   http://www.myhost.com/squirrelmail/src/login.php
 245
 246       global $PHP_SELF, $SERVER_NAME, $HTTP_HOST, $SERVER_PORT,
 247          $HTTP_SERVER_VARS;
 248
 249       // Get the path
 250       $path = substr($PHP_SELF, 0, strrpos($PHP_SELF, '/'));
 251
 252       // Check if this is a HTTPS or regular HTTP request
 253       $proto = 'http://';
 254       // If you have 'SSLOptions +StdEnvVars' in your apache config
 255       // OR if you have HTTPS in your HTTP_SERVER_VARS
 256       // OR if you are on port 443
 257       $getEnvVar = getenv('HTTPS');
 258       if ((isset($getEnvVar) && !strcasecmp($getEnvVar, 'on')) ||
 259           (isset($HTTP_SERVER_VARS['HTTPS'])) ||
 260           (isset($HTTP_SERVER_VARS['SERVER_PORT']) &&
 261            $HTTP_SERVER_VARS['SERVER_PORT'] == 443)) {
 262         $proto = 'https://';
 263       }
 264
 265       // Get the hostname from the Host header or server config.
 266       $host = '';
 267       if (isset($HTTP_HOST) && !empty($HTTP_HOST))
 268       {
 269           $host = $HTTP_HOST;
 270       }
 271       else if (isset($SERVER_NAME) && !empty($SERVER_NAME))
 272       {
 273           $host = $SERVER_NAME;
 274       }
 275
 276       $port = '';
 277       if (! strstr($host, ':'))
 278       {
 279           if (isset($SERVER_PORT)) {
 280               if (($SERVER_PORT != 80 && $proto == 'http://')
 281                       || ($SERVER_PORT != 443 && $proto == 'https://')) {
 282                   $port = sprintf(':%d', $SERVER_PORT);
 283               }
 284           }
 285       }
 286
 287       if ($host)
 288           return $proto . $host . $port . $path;
 289
 290       // Fallback is to omit the server name and use a relative URI,
 291       // although this is not RFC 2616 compliant.
 292       return $path;
 293    }
 294
 295
 296    // These functions are used to encrypt the passowrd before it is
 297    // stored in a cookie.
 298    function OneTimePadEncrypt ($string, $epad) {
 299       $pad = base64_decode($epad);
 300       $encrypted = '';
 301       for ($i = 0; $i < strlen ($string); $i++) {
 302           $encrypted .= chr (ord($string[$i]) ^ ord($pad[$i]));
 303       }
 304
 305       return base64_encode($encrypted);
 306    }
 307
 308    function OneTimePadDecrypt ($string, $epad) {
 309       $pad = base64_decode($epad);
 310       $encrypted = base64_decode ($string);
 311       $decrypted = '';
 312       for ($i = 0; $i < strlen ($encrypted); $i++) {
 313           $decrypted .= chr (ord($encrypted[$i]) ^ ord($pad[$i]));
 314       }
 315
 316       return $decrypted;
 317    }
 318
 319
 320    // Randomize the mt_rand() function.  Toss this in strings or
 321    // integers and it will seed the generator appropriately.
 322    // With strings, it is better to get them long. Use md5() to
 323    // lengthen smaller strings.
 324    function sq_mt_seed($Val)
 325    {
 326        // if mt_getrandmax() does not return a 2^n - 1 number,
 327        // this might not work well.  This uses $Max as a bitmask.
 328        $Max = mt_getrandmax();
 329
 330        if (! is_int($Val))
 331        {
 332            if (function_exists('crc32'))
 333            {
 334                $Val = crc32($Val);
 335            }
 336            else
 337            {
 338                $Str = $Val;
 339                $Pos = 0;
 340                $Val = 0;
 341                $Mask = $Max / 2;
 342                $HighBit = $Max ^ $Mask;
 343                while ($Pos < strlen($Str))
 344                {
 345                    if ($Val & $HighBit)
 346                    {
 347                        $Val = (($Val & $Mask) << 1) + 1;
 348                    }
 349                    else
 350                    {
 351                        $Val = ($Val & $Mask) << 1;
 352                    }
 353                    $Val ^= $Str[$Pos];
 354                    $Pos ++;
 355                }
 356            }
 357        }
 358
 359        if ($Val < 0)
 360          $Val *= -1;
 361        if ($Val = 0)
 362          return;
 363
 364        mt_srand(($Val ^ mt_rand(0, $Max)) & $Max);
 365    }
 366
 367
 368    // This function initializes the random number generator fairly well.
 369    // It also only initializes it once, so you don't accidentally get
 370    // the same 'random' numbers twice in one session.
 371    function sq_mt_randomize()
 372    {
 373       global $REMOTE_PORT, $REMOTE_ADDR, $UNIQUE_ID;
 374       static $randomized;
 375
 376       if ($randomized)
 377          return;
 378
 379       // Global
 380       sq_mt_seed((int)((double) microtime() * 1000000));
 381       sq_mt_seed(md5($REMOTE_PORT . $REMOTE_ADDR . getmypid()));
 382
 383       // getrusage
 384       if (function_exists('getrusage')) {
 385          // Avoid warnings with Win32
 386          $dat = @getrusage();
 387          if (isset($dat) && is_array($dat))
 388          {
 389             $Str = '';
 390             foreach ($dat as $k => $v)
 391             {
 392                $Str .= $k . $v;
 393             }
 394             sq_mt_seed(md5($Str));
 395          }
 396       }
 397
 398       // Apache-specific
 399       sq_mt_seed(md5($UNIQUE_ID));
 400
 401       $randomized = 1;
 402    }
 403
 404    function OneTimePadCreate ($length=100) {
 405       sq_mt_randomize();
 406
 407       $pad = '';
 408       for ($i = 0; $i < $length; $i++) {
 409           $pad .= chr(mt_rand(0,255));
 410       }
 411
 412       return base64_encode($pad);
 413    }
 414
 415    // Check if we have a required PHP-version. Return TRUE if we do,
 416    // or FALSE if we don't.
 417    // To check for 4.0.1, use sqCheckPHPVersion(4,0,1)
 418    // To check for 4.0b3, use sqCheckPHPVersion(4,0,-3)
 419    // Does not handle betas like 4.0.1b1 or development versions
 420    function sqCheckPHPVersion($major, $minor, $release) {
 421
 422       $ver = phpversion();
 423       eregi('^([0-9]+)\\.([0-9]+)(.*)', $ver, $regs);
 424
 425       // Parse the version string
 426       $vmajor  = strval($regs[1]);
 427       $vminor  = strval($regs[2]);
 428       $vrel    = $regs[3];
 429       if($vrel[0] == ".")
 430           $vrel = strval(substr($vrel, 1));
 431       if($vrel[0] == 'b' || $vrel[0] == 'B')
 432           $vrel = - strval(substr($vrel, 1));
 433       if($vrel[0] == 'r' || $vrel[0] == 'R')
 434           $vrel = - strval(substr($vrel, 2))/10;
 435
 436       // Compare major version
 437       if($vmajor < $major) return false;
 438       if($vmajor > $major) return true;
 439
 440       // Major is the same. Compare minor
 441       if($vminor < $minor) return false;
 442       if($vminor > $minor) return true;
 443
 444       // Major and minor is the same as the required one.
 445       // Compare release
 446       if($vrel >= 0 && $release >= 0) {       // Neither are beta
 447           if($vrel < $release) return false;
 448       } else if($vrel >= 0 && $release < 0){  // This is not beta, required is beta
 449           return true;
 450       } else if($vrel < 0 && $release >= 0){  // This is beta, require not beta
 451           return false;
 452       } else {                                // Both are beta
 453           if($vrel > $release) return false;
 454       }
 455
 456       return true;
 457    }
 458
 459    /* Returns a string showing the size of the message/attachment */
 460    function show_readable_size($bytes)
 461    {
 462        $bytes /= 1024;
 463        $type = 'k';
 464
 465        if ($bytes / 1024 > 1)
 466        {
 467            $bytes /= 1024;
 468            $type = 'm';
 469        }
 470
 471        if ($bytes < 10)
 472        {
 473            $bytes *= 10;
 474            settype($bytes, 'integer');
 475            $bytes /= 10;
 476        }
 477        else
 478            settype($bytes, 'integer');
 479
 480        return $bytes . '<small>&nbsp;' . $type . '</small>';
 481    }
 482
 483    /* Generates a random string from the caracter set you pass in
 484     *
 485     * Flags:
 486     *   1 = add lowercase a-z to $chars
 487     *   2 = add uppercase A-Z to $chars
 488     *   4 = add numbers 0-9 to $chars
 489     */
 490
 491    function GenerateRandomString($size, $chars, $flags = 0)
 492    {
 493       if ($flags & 0x1)
 494           $chars .= 'abcdefghijklmnopqrstuvwxyz';
 495       if ($flags & 0x2)
 496           $chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 497       if ($flags & 0x4)
 498           $chars .= '0123456789';
 499
 500       if ($size < 1 || strlen($chars) < 1)
 501           return '';
 502
 503       sq_mt_randomize(); // Initialize the random number generator
 504
 505       $String = "";
 506       while (strlen($String) < $size) {
 507          $String .= $chars[mt_rand(0, strlen($chars))];
 508       }
 509
 510       return $String;
 511    }
 512
 513    function quoteIMAP($str)
 514    {
 515        return ereg_replace('(["\\])', '\\\\1', $str);
 516    }
 517
 518 ?>