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<?php
/*
PHPRtfLite
Copyright 2007-2008 Denis Slaveckij <info@phprtf.com>
Copyright 2010 Steffen Zeidler <sigma_z@web.de>
This file is part of PHPRtfLite.
PHPRtfLite is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PHPRtfLite is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PHPRtfLite. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* UTF8 class with static functions that converts utf8 characters into rtf utf8 entities.
* @version 1.0.1
* @author Denis Slaveckij <info@phprtf.com>
* @author Steffen Zeidler <sigma_z@web.de>
* @copyright 2007-2008 Denis Slaveckij, 2010 Steffen Zeidler
* @package PHPRtfLite
*/
class PHPRtfLite_Utf8 {
/**
* Converts text with utf8 characters into rtf utf8 entites.
*
* @param string $str
*/
static public function getUnicodeEntities($str) {
return self::unicodeToEntitiesPreservingAscii(self::utf8ToUnicode($str));
}
/**
* @see http://www.randomchaos.com/documents/?source=php_and_unicode
*
* Gets unicode for each character
*
* @return array
*/
static private function utf8ToUnicode($str) {
$unicode = array();
$values = array();
$lookingFor = 1;
for ($i = 0; $i < strlen($str); $i++ ) {
$thisValue = ord($str[$i]);
if ($thisValue < 128) {
$unicode[] = $thisValue;
}
else {
if (count( $values ) == 0) {
$lookingFor = $thisValue < 224 ? 2 : 3;
}
$values[] = $thisValue;
if (count($values) == $lookingFor) {
$number = $lookingFor == 3
? (($values[0] % 16) * 4096) + (($values[1] % 64) * 64) + ($values[2] % 64)
: (($values[0] % 32) * 64) + ($values[1] % 64);
$unicode[] = $number;
$values = array();
$lookingFor = 1;
}
}
}
return $unicode;
}
/**
* Converts text with utf8 characters into rtf utf8 entites preserving ascii.
*
* @param string $unicode
*
* @return string
*/
static private function unicodeToEntitiesPreservingAscii($unicode) {
$entities = '';
foreach ($unicode as $value) {
if ($value != 65279) {
$entities .= $value > 127
? '\uc0\u' . $value . ' '
: chr($value);
}
}
return $entities;
}
}
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