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106 lines
3.1 KiB
PHTML
106 lines
3.1 KiB
PHTML
11 years ago
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* A class for performing byte-wise string operations
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*
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* GPG I/O streams are managed using bytes rather than characters.
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*
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* PHP version 5
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*
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* LICENSE:
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* @category Encryption
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* @package Crypt_GPG
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* @author Michael Gauthier <mike@silverorange.com>
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* @copyright 2013 silverorange
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version CVS: $Id$
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* @link http://pear.php.net/package/Crypt_GPG
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*/
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// {{{ class Crypt_GPG_ByteUtils
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/**
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* A class for performing byte-wise string operations
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*
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* GPG I/O streams are managed using bytes rather than characters. This class
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* requires the mbstring extension to be available.
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*
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* @category Encryption
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* @package Crypt_GPG
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* @author Michael Gauthier <mike@silverorange.com>
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* @copyright 2013 silverorange
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @link http://pear.php.net/package/Crypt_GPG
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* @link http://php.net/mbstring
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*/
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class Crypt_GPG_ByteUtils
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{
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// {{{ strlen()
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/**
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* Gets the length of a string in bytes
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*
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* This is used for stream-based communication with the GPG subprocess.
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*
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* @param string $string the string for which to get the length.
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*
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* @return integer the length of the string in bytes.
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*/
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public static function strlen($string)
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{
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return mb_strlen($string, '8bit');
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}
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// }}}
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// {{{ substr()
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/**
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* Gets the substring of a string in bytes
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*
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* This is used for stream-based communication with the GPG subprocess.
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*
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* @param string $string the input string.
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* @param integer $start the starting point at which to get the substring.
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* @param integer $length optional. The length of the substring.
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*
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* @return string the extracted part of the string. Unlike the default PHP
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* <kbd>substr()</kbd> function, the returned value is
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* always a string and never false.
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*/
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public static function substr($string, $start, $length = null)
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{
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if ($length === null) {
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return mb_substr(
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$string,
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$start,
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self::strlen($string) - $start, '8bit'
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);
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}
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return mb_substr($string, $start, $length, '8bit');
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}
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// }}}
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}
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// }}}
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?>
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