Viewing file:  imap_utf7_local.php (8.39 KB) -rw-r--r--
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<?php
/**
* functions/imap_utf7_local.php - utf7-imap functions
*
* This implements all functions that do imap UTF7 conversions.
* Before 1.3.2 functions were stored in imap_utf7_decode_local.php and
* imap_utf7_encode_local.php files.
*
* @copyright © 1999-2006 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: imap_utf7_local.php,v 1.24 2006/01/23 18:39:33 tokul Exp $
* @package squirrelmail
* @subpackage imap
* @since 1.3.2
*/
/**
* Function that uses php mbstring functions to convert from and to utf7-imap charset
*
* Since 1.5.1 list of supported charsets depends sq_mb_list_encoding function.
* Before that it was hardcoded to iso-8859-x, utf-8 and iso-2022-jp.
* @param string $str folder name
* @param string $to_encoding name of resulting charset
* @param string $from_encoding name of original charset
* @param string $default_charset default charset used by translation.
* @return string encoded folder name or ''
* @since 1.4.2
*/
function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset) {
$supported_encodings=sq_mb_list_encodings();
if ( in_array(strtolower($default_charset),$supported_encodings) &&
function_exists('mb_convert_encoding')) {
return mb_convert_encoding($str, $to_encoding, $from_encoding);
}
return '';
}
/**
* encode folder name to utf7-imap
*
* If mbstring functions do not support charset used by translation, falls back to iso-8859-1
* @param string $s folder name
* @return string utf7-imap encoded folder name
* @since 1.2.7
*/
function imap_utf7_encode_local($s) {
global $languages, $squirrelmail_language;
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
function_exists($languages[$squirrelmail_language]['XTRA_CODE'].'_utf7_imap_encode')) {
return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_encode', $s);
}
if ($s == '') //If empty, don't bother
return '';
global $default_charset;
set_my_charset(); //must be called before using $default_charset
if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
$utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset);
if ($utf7_s != '')
return $utf7_s;
}
// Later code works only for ISO-8859-1
$b64_s = ''; // buffer for substring to be base64-encoded
$utf7_s = ''; // imap-utf7-encoded string
for ($i = 0; $i < strlen($s); $i++) {
$c = $s[$i];
$ord_c = ord($c);
if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or
(($ord_c >= 0x27) and ($ord_c <= 0x7e))) {
if ($b64_s) {
$utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-';
$b64_s = '';
}
$utf7_s = $utf7_s . $c;
} elseif ($ord_c == 0x26) {
if ($b64_s) {
$utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
$b64_s = '';
}
$utf7_s = $utf7_s . '&-';
} else {
$b64_s = $b64_s . chr(0) . $c;
}
}
//
// flush buffer
//
if ($b64_s) {
$utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
$b64_s = '';
}
return $utf7_s;
}
/**
* converts folder name from utf7-imap to charset used by translation
*
* If mbstring functions do not support charset used by translation, falls back to iso-8859-1
* @param string $s folder name in utf7-imap
* @return string folder name in charset used by translation
* @since 1.2.7
*/
function imap_utf7_decode_local($s) {
global $languages, $squirrelmail_language;
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode')) {
return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode', $s);
}
if ($s == '') //If empty, don't bother
return '';
global $default_charset;
set_my_charset(); //must be called before using $default_charset
if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
$utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset);
if ($utf7_s != '')
return $utf7_s;
}
// Later code works only for ISO-8859-1
$b64_s = '';
$iso_8859_1_s = '';
for ($i = 0, $len = strlen($s); $i < $len; $i++) {
$c = $s[$i];
if (strlen($b64_s) > 0) {
if ($c == '-') {
if ($b64_s == '&') {
$iso_8859_1_s = $iso_8859_1_s . '&';
} else {
$iso_8859_1_s = $iso_8859_1_s .
decodeBASE64(substr($b64_s, 1));
}
$b64_s = '';
} else {
$b64_s = $b64_s . $c;
}
} else {
if ($c == '&') {
$b64_s = '&';
} else {
$iso_8859_1_s = $iso_8859_1_s . $c;
}
}
}
return $iso_8859_1_s;
}
/**
* Converts string to base64
* @param string $s string
* @return string base64 encoded string
* @since 1.2.7
*/
function encodeBASE64($s) {
$B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,';
$p = 0; // phase: 1 / 2 / 3 / 1 / 2 / 3...
$e = ''; // base64-encoded string
//foreach($s as $c) {
for ($i = 0; $i < strlen($s); $i++) {
$c = $s[$i];
if ($p == 0) {
$e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1);
$t = (ord($c) & 3);
$p = 1;
} elseif ($p == 1) {
$e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)];
$t = (ord($c) & 15);
$p = 2;
} elseif ($p == 2) {
$e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)];
$e = $e . $B64Chars[ord($c) & 63];
$p = 0;
}
}
//
// flush buffer
//
if ($p == 1) {
$e = $e . $B64Chars[$t << 4];
} elseif ($p == 2) {
$e = $e . $B64Chars[$t << 2];
}
return $e;
}
/**
* Converts string from base64
* @param string $s base64 encoded string
* @return string decoded string
* @since 1.2.7
*/
function decodeBASE64($s) {
$B64Values = array(
'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5,
'G' => 6, 'H' => 7, 'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11,
'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17,
'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23,
'Y' => 24, 'Z' => 25,
'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31,
'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37,
'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43,
's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49,
'y' => 50, 'z' => 51,
'0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57,
'6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63
);
$p = 0;
$d = '';
$unicodeNullByteToggle = 0;
for ($i = 0, $len = strlen($s); $i < $len; $i++) {
$c = $s[$i];
if ($p == 0) {
$t = $B64Values[$c];
$p = 1;
} elseif ($p == 1) {
if ($unicodeNullByteToggle) {
$d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4));
$unicodeNullByteToggle = 0;
} else {
$unicodeNullByteToggle = 1;
}
$t = ($B64Values[$c] & 15);
$p = 2;
} elseif ($p == 2) {
if ($unicodeNullByteToggle) {
$d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2));
$unicodeNullByteToggle = 0;
} else {
$unicodeNullByteToggle = 1;
}
$t = ($B64Values[$c] & 3);
$p = 3;
} elseif ($p == 3) {
if ($unicodeNullByteToggle) {
$d = $d . chr(($t << 6) + $B64Values[$c]);
$unicodeNullByteToggle = 0;
} else {
$unicodeNullByteToggle = 1;
}
$t = ($B64Values[$c] & 3);
$p = 0;
}
}
return $d;
}
?>
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