File Source for strings.php

<?php
/**
* strings.php
*
* This code provides various string manipulation functions that are
* used by the rest of the SquirrelMail code.
*
* @copyright © 1999-2006 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: strings.php,v 1.184.2.58 2006/08/11 11:24:05 kink Exp $
* @package squirrelmail
*/
/**
* SquirrelMail version number -- DO NOT CHANGE
*/
global $version;
$version = '1.4.9 [CVS]';
/**
* SquirrelMail internal version number -- DO NOT CHANGE
* $sm_internal_version = array (release, major, minor)
*/
global $SQM_INTERNAL_VERSION;
$SQM_INTERNAL_VERSION = array(1,4,9);
/**
* There can be a circular issue with includes, where the $version string is
* referenced by the include of global.php, etc. before it's defined.
* For that reason, bring in global.php AFTER we define the version strings.
*/
require_once(SM_PATH . 'functions/global.php');
/**
* Wraps text at $wrap characters
*
* Has a problem with special HTML characters, so call this before
* you do character translation.
*
* Specifically, &#039 comes up as 5 characters instead of 1.
* This should not add newlines to the end of lines.
*/
function sqWordWrap(&$line, $wrap, $charset=null) {
global $languages, $squirrelmail_language;
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
if (mb_detect_encoding($line) != 'ASCII') {
$line = $languages[$squirrelmail_language]['XTRA_CODE']('wordwrap', $line, $wrap);
return;
}
}
ereg("^([\t >]*)([^\t >].*)?$", $line, $regs);
$beginning_spaces = $regs[1];
if (isset($regs[2])) {
$words = explode(' ', $regs[2]);
} else {
$words = '';
}
$i = 0;
$line = $beginning_spaces;
while ($i < count($words)) {
/* Force one word to be on a line (minimum) */
$line .= $words[$i];
$line_len = strlen($beginning_spaces) + sq_strlen($words[$i],$charset) + 2;
if (isset($words[$i + 1]))
$line_len += sq_strlen($words[$i + 1],$charset);
$i ++;
/* Add more words (as long as they fit) */
while ($line_len < $wrap && $i < count($words)) {
$line .= ' ' . $words[$i];
$i++;
if (isset($words[$i]))
$line_len += sq_strlen($words[$i],$charset) + 1;
else
$line_len += 1;
}
/* Skip spaces if they are the first thing on a continued line */
while (!isset($words[$i]) && $i < count($words)) {
$i ++;
}
/* Go to the next line if we have more to process */
if ($i < count($words)) {
$line .= "\n";
}
}
}
/**
* Does the opposite of sqWordWrap()
* @param string body the text to un-wordwrap
* @return void
*/
function sqUnWordWrap(&$body) {
global $squirrelmail_language;
if ($squirrelmail_language == 'ja_JP') {
return;
}
$lines = explode("\n", $body);
$body = '';
$PreviousSpaces = '';
$cnt = count($lines);
for ($i = 0; $i < $cnt; $i ++) {
preg_match("/^([\t >]*)([^\t >].*)?$/", $lines[$i], $regs);
$CurrentSpaces = $regs[1];
if (isset($regs[2])) {
$CurrentRest = $regs[2];
} else {
$CurrentRest = '';
}
if ($i == 0) {
$PreviousSpaces = $CurrentSpaces;
$body = $lines[$i];
} else if (($PreviousSpaces == $CurrentSpaces) /* Do the beginnings match */
&& (strlen($lines[$i - 1]) > 65) /* Over 65 characters long */
&& strlen($CurrentRest)) { /* and there's a line to continue with */
$body .= ' ' . $CurrentRest;
} else {
$body .= "\n" . $lines[$i];
$PreviousSpaces = $CurrentSpaces;
}
}
$body .= "\n";
}
/**
* Truncates a string and take care of html encoded characters
*
* @param string $s string to truncate
* @param int $iTrimAt Trim at nn characters
* @return string Trimmed string
*/
function truncateWithEntities($s, $iTrimAt) {
global $languages, $squirrelmail_language;
$ent_strlen = strlen($s);
if (($iTrimAt <= 0) || ($ent_strlen <= $iTrimAt))
return $s;
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
return $languages[$squirrelmail_language]['XTRA_CODE']('strimwidth', $s, $iTrimAt);
} else {
/*
* see if this is entities-encoded string
* If so, Iterate through the whole string, find out
* the real number of characters, and if more
* than $iTrimAt, substr with an updated trim value.
*/
$trim_val = $iTrimAt;
$ent_offset = 0;
$ent_loc = 0;
while ( $ent_loc < $trim_val && (($ent_loc = strpos($s, '&', $ent_offset)) !== false) &&
(($ent_loc_end = strpos($s, ';', $ent_loc+3)) !== false) ) {
$trim_val += ($ent_loc_end-$ent_loc);
$ent_offset = $ent_loc_end+1;
}
if (($trim_val > $iTrimAt) && ($ent_strlen > $trim_val) && (strpos($s,';',$trim_val) < ($trim_val + 6))) {
$i = strpos($s,';',$trim_val);
if ($i !== false) {
$trim_val = strpos($s,';',$trim_val)+1;
}
}
// only print '...' when we're actually dropping part of the subject
if ($ent_strlen <= $trim_val)
return $s;
}
return substr_replace($s, '...', $trim_val);
}
/**
* If $haystack is a full mailbox name and $needle is the mailbox
* separator character, returns the last part of the mailbox name.
*
* @param string haystack full mailbox name to search
* @param string needle the mailbox separator character
* @return string the last part of the mailbox name
*/
function readShortMailboxName($haystack, $needle) {
if ($needle == '') {
$elem = $haystack;
} else {
$parts = explode($needle, $haystack);
$elem = array_pop($parts);
while ($elem == '' && count($parts)) {
$elem = array_pop($parts);
}
}
return( $elem );
}
/**
* php_self
*
* Creates an URL for the page calling this function, using either the PHP global
* REQUEST_URI, or the PHP global PHP_SELF with QUERY_STRING added.
*
* @return string the complete url for this page
*/
function php_self () {
if ( sqgetGlobalVar('REQUEST_URI', $req_uri, SQ_SERVER) && !empty($req_uri) ) {
return $req_uri;
}
if ( sqgetGlobalVar('PHP_SELF', $php_self, SQ_SERVER) && !empty($php_self) ) {
// need to add query string to end of PHP_SELF to match REQUEST_URI
//
if ( sqgetGlobalVar('QUERY_STRING', $query_string, SQ_SERVER) && !empty($query_string) ) {
$php_self .= '?' . $query_string;
}
return $php_self;
}
return '';
}
/**
* Find out where squirrelmail lives and try to be smart about it.
* The only problem would be when squirrelmail lives in directories
* called "src", "functions", or "plugins", but people who do that need
* to be beaten with a steel pipe anyway.
*
* @return string the base uri of squirrelmail installation.
*/
function sqm_baseuri(){
global $base_uri, $PHP_SELF;
/**
* If it is in the session, just return it.
*/
if (sqgetGlobalVar('base_uri',$base_uri,SQ_SESSION)){
return $base_uri;
}
$dirs = array('|src/.*|', '|plugins/.*|', '|functions/.*|');
$repl = array('', '', '');
$base_uri = preg_replace($dirs, $repl, $PHP_SELF);
return $base_uri;
}
/**
* get_location
*
* Determines the location to forward to, relative to your server.
* This is used in HTTP Location: redirects.
* If set, it uses $config_location_base as the first part of the URL,
* specifically, the protocol, hostname and port parts. The path is
* always autodetected.
*
* @return string the base url for this SquirrelMail installation
*/
function get_location () {
global $imap_server_type, $config_location_base;
/* Get the path, handle virtual directories */
if(strpos(php_self(), '?')) {
$path = substr(php_self(), 0, strpos(php_self(), '?'));
} else {
$path = php_self();
}
$path = substr($path, 0, strrpos($path, '/'));
// proto+host+port are already set in config:
if ( !empty($config_location_base) ) {
// register it in the session just in case some plugin depends on this
sqsession_register($config_location_base . $path, 'sq_base_url');
return $config_location_base . $path ;
}
// we computed it before, get it from the session:
if ( sqgetGlobalVar('sq_base_url', $full_url, SQ_SESSION) ) {
return $full_url . $path;
}
// else: autodetect
/* Check if this is a HTTPS or regular HTTP request. */
$proto = 'http://';
/*
* If you have 'SSLOptions +StdEnvVars' in your apache config
* OR if you have HTTPS=on in your HTTP_SERVER_VARS
* OR if you are on port 443
*/
$getEnvVar = getenv('HTTPS');
if ((isset($getEnvVar) && strcasecmp($getEnvVar, 'on') === 0) ||
(sqgetGlobalVar('HTTPS', $https_on, SQ_SERVER) && strcasecmp($https_on, 'on') === 0) ||
(sqgetGlobalVar('SERVER_PORT', $server_port, SQ_SERVER) && $server_port == 443)) {
$proto = 'https://';
}
/* Get the hostname from the Host header or server config. */
if ( !sqgetGlobalVar('HTTP_X_FORWARDED_HOST', $host, SQ_SERVER) || empty($host) ) {
if ( !sqgetGlobalVar('HTTP_HOST', $host, SQ_SERVER) || empty($host) ) {
if ( !sqgetGlobalVar('SERVER_NAME', $host, SQ_SERVER) || empty($host) ) {
$host = '';
}
}
}
$port = '';
if (! strstr($host, ':')) {
if (sqgetGlobalVar('SERVER_PORT', $server_port, SQ_SERVER)) {
if (($server_port != 80 && $proto == 'http://') ||
($server_port != 443 && $proto == 'https://')) {
$port = sprintf(':%d', $server_port);
}
}
}
/* this is a workaround for the weird macosx caching that
causes Apache to return 16080 as the port number, which causes
SM to bail */
if ($imap_server_type == 'macosx' && $port == ':16080') {
$port = '';
}
/* Fallback is to omit the server name and use a relative */
/* URI, although this is not RFC 2616 compliant. */
$full_url = ($host ? $proto . $host . $port : '');
sqsession_register($full_url, 'sq_base_url');
return $full_url . $path;
}
/**
* Encrypts password
*
* These functions are used to encrypt the password before it is
* stored in a cookie. The encryption key is generated by
* OneTimePadCreate();
*
* @param string string the (password)string to encrypt
* @param string epad the encryption key
* @return string the base64-encoded encrypted password
*/
function OneTimePadEncrypt ($string, $epad) {
$pad = base64_decode($epad);
if (strlen($pad)>0) {
// make sure that pad is longer than string
while (strlen($string)>strlen($pad)) {
$pad.=$pad;
}
} else {
// FIXME: what should we do when $epad is not base64 encoded or empty.
}
$encrypted = '';
for ($i = 0; $i < strlen ($string); $i++) {
$encrypted .= chr (ord($string[$i]) ^ ord($pad[$i]));
}
return base64_encode($encrypted);
}
/**
* Decrypts a password from the cookie
*
* Decrypts a password from the cookie, encrypted by OneTimePadEncrypt.
* This uses the encryption key that is stored in the session.
*
* @param string string the string to decrypt
* @param string epad the encryption key from the session
* @return string the decrypted password
*/
function OneTimePadDecrypt ($string, $epad) {
$pad = base64_decode($epad);
if (strlen($pad)>0) {
// make sure that pad is longer than string
while (strlen($string)>strlen($pad)) {
$pad.=$pad;
}
} else {
// FIXME: what should we do when $epad is not base64 encoded or empty.
}
$encrypted = base64_decode ($string);
$decrypted = '';
for ($i = 0; $i < strlen ($encrypted); $i++) {
$decrypted .= chr (ord($encrypted[$i]) ^ ord($pad[$i]));
}
return $decrypted;
}
/**
* Randomizes the mt_rand() function.
*
* Toss this in strings or integers and it will seed the generator
* appropriately. With strings, it is better to get them long.
* Use md5() to lengthen smaller strings.
*
* @param mixed val a value to seed the random number generator
* @return void
*/
function sq_mt_seed($Val) {
/* if mt_getrandmax() does not return a 2^n - 1 number,
this might not work well. This uses $Max as a bitmask. */
$Max = mt_getrandmax();
if (! is_int($Val)) {
$Val = crc32($Val);
}
if ($Val < 0) {
$Val *= -1;
}
if ($Val == 0) {
return;
}
mt_srand(($Val ^ mt_rand(0, $Max)) & $Max);
}
/**
* Init random number generator
*
* This function initializes the random number generator fairly well.
* It also only initializes it once, so you don't accidentally get
* the same 'random' numbers twice in one session.
*
* @return void
*/
function sq_mt_randomize() {
static $randomized;
if ($randomized) {
return;
}
/* Global. */
sqgetGlobalVar('REMOTE_PORT', $remote_port, SQ_SERVER);
sqgetGlobalVar('REMOTE_ADDR', $remote_addr, SQ_SERVER);
sq_mt_seed((int)((double) microtime() * 1000000));
sq_mt_seed(md5($remote_port . $remote_addr . getmypid()));
/* getrusage */
if (function_exists('getrusage')) {
/* Avoid warnings with Win32 */
$dat = @getrusage();
if (isset($dat) && is_array($dat)) {
$Str = '';
foreach ($dat as $k => $v)
{
$Str .= $k . $v;
}
sq_mt_seed(md5($Str));
}
}
if(sqgetGlobalVar('UNIQUE_ID', $unique_id, SQ_SERVER)) {
sq_mt_seed(md5($unique_id));
}
$randomized = 1;
}
/**
* Creates encryption key
*
* Creates an encryption key for encrypting the password stored in the cookie.
* The encryption key itself is stored in the session.
*
* @param int length optional, length of the string to generate
* @return string the encryption key
*/
function OneTimePadCreate ($length=100) {
sq_mt_randomize();
$pad = '';
for ($i = 0; $i < $length; $i++) {
$pad .= chr(mt_rand(0,255));
}
return base64_encode($pad);
}
/**
* Returns a string showing the size of the message/attachment.
*
* @param int bytes the filesize in bytes
* @return string the filesize in human readable format
*/
function show_readable_size($bytes) {
$bytes /= 1024;
$type = 'k';
if ($bytes / 1024 > 1) {
$bytes /= 1024;
$type = 'M';
}
if ($bytes < 10) {
$bytes *= 10;
settype($bytes, 'integer');
$bytes /= 10;
} else {
settype($bytes, 'integer');
}
return $bytes . '<small> ' . $type . '</small>';
}
/**
* Generates a random string from the caracter set you pass in
*
* @param int size the size of the string to generate
* @param string chars a string containing the characters to use
* @param int flags a flag to add a specific set to the characters to use:
* Flags:
* 1 = add lowercase a-z to $chars
* 2 = add uppercase A-Z to $chars
* 4 = add numbers 0-9 to $chars
* @return string the random string
*/
function GenerateRandomString($size, $chars, $flags = 0) {
if ($flags & 0x1) {
$chars .= 'abcdefghijklmnopqrstuvwxyz';
}
if ($flags & 0x2) {
$chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
}
if ($flags & 0x4) {
$chars .= '0123456789';
}
if (($size < 1) || (strlen($chars) < 1)) {
return '';
}
sq_mt_randomize(); /* Initialize the random number generator */
$String = '';
$j = strlen( $chars ) - 1;
while (strlen($String) < $size) {
$String .= $chars{mt_rand(0, $j)};
}
return $String;
}
/**
* Escapes special characters for use in IMAP commands.
*
* @param

Source for file strings.php