<?php
+
+/**
+ * utf-8 encoding functions
+ *
+ * takes a string of unicode entities and converts it to a utf-8 encoded string
+ * each unicode entitiy has the form &#nnn(nn); n={0..9} and can be displayed by utf-8 supporting
+ * browsers. Ascii will not be modified.
+ *
+ * Original code is taken from www.php.net manual comments
+ * Original author: ronen at greyzone dot com
+ *
+ * @copyright 2004-2020 The SquirrelMail Project Team
+ * @license http://opensource.org/licenses/gpl-license.php GNU Public License
+ * @version $Id$
+ * @package squirrelmail
+ * @subpackage encode
+ */
+
+/**
+ * Converts string to utf-8
+ * @param string $string text with numeric unicode entities
+ * @return string utf-8 encoded text
+ */
+function charset_encode_utf_8 ($string) {
+ // don't run encoding function, if there is no encoded characters
+ if (! preg_match("'&#[0-9]+;'",$string) ) return $string;
+
+ $string=preg_replace_callback("/&#([0-9]+);/",'unicodetoutf8',$string);
+
+ return $string;
+}
+
/**
-* takes a string of unicode entities and converts it to a utf-8 encoded string
-* each unicode entitiy has the form &#nnn(nn); n={0..9} and can be displayed by utf-8 supporting
-* browsers. Ascii will not be modified.
-* @param $source string of unicode entities [STRING]
-* @return a utf-8 encoded string [STRING]
-* @access public
-*/
-function charset_encode_utf_8 ($source) {
- $utf8Str = '';
- $entityArray = explode ("&#", $source);
- $size = count ($entityArray);
- for ($i = 0; $i < $size; $i++) {
- $subStr = $entityArray[$i];
- $nonEntity = strstr ($subStr, ';');
- if ($nonEntity !== false) {
- $unicode = intval (substr ($subStr, 0, (strpos ($subStr, ';') + 1)));
- // determine how many chars are needed to reprsent this unicode char
- if ($unicode < 128) {
- $utf8Substring = chr ($unicode);
- }
- else if ($unicode >= 128 && $unicode < 2048) {
- $binVal = str_pad (decbin ($unicode), 11, "0", STR_PAD_LEFT);
- $binPart1 = substr ($binVal, 0, 5);
- $binPart2 = substr ($binVal, 5);
-
- $char1 = chr (192 + bindec ($binPart1));
- $char2 = chr (128 + bindec ($binPart2));
- $utf8Substring = $char1 . $char2;
- }
- else if ($unicode >= 2048 && $unicode < 65536) {
- $binVal = str_pad (decbin ($unicode), 16, "0", STR_PAD_LEFT);
- $binPart1 = substr ($binVal, 0, 4);
- $binPart2 = substr ($binVal, 4, 6);
- $binPart3 = substr ($binVal, 10);
-
- $char1 = chr (224 + bindec ($binPart1));
- $char2 = chr (128 + bindec ($binPart2));
- $char3 = chr (128 + bindec ($binPart3));
- $utf8Substring = $char1 . $char2 . $char3;
- }
- else {
- $binVal = str_pad (decbin ($unicode), 21, "0", STR_PAD_LEFT);
- $binPart1 = substr ($binVal, 0, 3);
- $binPart2 = substr ($binVal, 3, 6);
- $binPart3 = substr ($binVal, 9, 6);
- $binPart4 = substr ($binVal, 15);
-
- $char1 = chr (240 + bindec ($binPart1));
- $char2 = chr (128 + bindec ($binPart2));
- $char3 = chr (128 + bindec ($binPart3));
- $char4 = chr (128 + bindec ($binPart4));
- $utf8Substring = $char1 . $char2 . $char3 . $char4;
- }
-
- if (strlen ($nonEntity) > 1)
- $nonEntity = substr ($nonEntity, 1); // chop the first char (';')
- else
- $nonEntity = '';
+ * Return utf8 symbol when unicode character number is provided
+ *
+ * This function is used internally by charset_encode_utf_8
+ * function. It might be unavailable to other SquirrelMail functions.
+ * Don't use it or make sure, that functions/encode/utf_8.php is
+ * included.
+ *
+ * @param array $matches array with first element a decimal unicode value
+ * @return string utf8 character
+ */
+function unicodetoutf8($matches) {
+ $var = $matches[1];
+
+ if ($var < 128) {
+ $ret = chr ($var);
+ } else if ($var < 2048) {
+ // Two byte utf-8
+ $binVal = str_pad (decbin ($var), 11, "0", STR_PAD_LEFT);
+ $binPart1 = substr ($binVal, 0, 5);
+ $binPart2 = substr ($binVal, 5);
+
+ $char1 = chr (192 + bindec ($binPart1));
+ $char2 = chr (128 + bindec ($binPart2));
+ $ret = $char1 . $char2;
+ } else if ($var < 65536) {
+ // Three byte utf-8
+ $binVal = str_pad (decbin ($var), 16, "0", STR_PAD_LEFT);
+ $binPart1 = substr ($binVal, 0, 4);
+ $binPart2 = substr ($binVal, 4, 6);
+ $binPart3 = substr ($binVal, 10);
+
+ $char1 = chr (224 + bindec ($binPart1));
+ $char2 = chr (128 + bindec ($binPart2));
+ $char3 = chr (128 + bindec ($binPart3));
+ $ret = $char1 . $char2 . $char3;
+ } else if ($var < 2097152) {
+ // Four byte utf-8
+ $binVal = str_pad (decbin ($var), 21, "0", STR_PAD_LEFT);
+ $binPart1 = substr ($binVal, 0, 3);
+ $binPart2 = substr ($binVal, 3, 6);
+ $binPart3 = substr ($binVal, 9, 6);
+ $binPart4 = substr ($binVal, 15);
+
+ $char1 = chr (240 + bindec ($binPart1));
+ $char2 = chr (128 + bindec ($binPart2));
+ $char3 = chr (128 + bindec ($binPart3));
+ $char4 = chr (128 + bindec ($binPart4));
+ $ret = $char1 . $char2 . $char3 . $char4;
+ } else if ($var < 67108864) {
+ // Five byte utf-8
+ $binVal = str_pad (decbin ($var), 26, "0", STR_PAD_LEFT);
+ $binPart1 = substr ($binVal, 0, 2);
+ $binPart2 = substr ($binVal, 2, 6);
+ $binPart3 = substr ($binVal, 8, 6);
+ $binPart4 = substr ($binVal, 14,6);
+ $binPart5 = substr ($binVal, 20);
- $utf8Str .= $utf8Substring . $nonEntity;
- }
- else {
- $utf8Str .= $subStr;
- }
- }
+ $char1 = chr (248 + bindec ($binPart1));
+ $char2 = chr (128 + bindec ($binPart2));
+ $char3 = chr (128 + bindec ($binPart3));
+ $char4 = chr (128 + bindec ($binPart4));
+ $char5 = chr (128 + bindec ($binPart5));
+ $ret = $char1 . $char2 . $char3 . $char4 . $char5;
+ } else if ($var < 2147483648) {
+ // Six byte utf-8
+ $binVal = str_pad (decbin ($var), 31, "0", STR_PAD_LEFT);
+ $binPart1 = substr ($binVal, 0, 1);
+ $binPart2 = substr ($binVal, 1, 6);
+ $binPart3 = substr ($binVal, 7, 6);
+ $binPart4 = substr ($binVal, 13,6);
+ $binPart5 = substr ($binVal, 19,6);
+ $binPart6 = substr ($binVal, 25);
- return $utf8Str;
+ $char1 = chr (252 + bindec ($binPart1));
+ $char2 = chr (128 + bindec ($binPart2));
+ $char3 = chr (128 + bindec ($binPart3));
+ $char4 = chr (128 + bindec ($binPart4));
+ $char5 = chr (128 + bindec ($binPart5));
+ $char6 = chr (128 + bindec ($binPart6));
+ $ret = $char1 . $char2 . $char3 . $char4 . $char5 . $char6;
+ } else {
+ // there is no such symbol in utf-8
+ $ret='?';
+ }
+ return $ret;
}
-?>
\ No newline at end of file
projects / squirrelmail.git / blobdiff