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c4b546f41f
Merges [29382] to the 3.9 branch. Adds a second copy of hash_equals() to pluggable.php in case compat.php is not copied over in an update. (The general goal is no cross-file dependencies for minor releases.) Built from https://develop.svn.wordpress.org/branches/3.9@29384 git-svn-id: http://core.svn.wordpress.org/branches/3.9@29162 1a063a9b-81f0-0310-95a4-ce76da25c4cd
125 lines
3.2 KiB
PHP
125 lines
3.2 KiB
PHP
<?php
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/**
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* WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
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*
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* @package PHP
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* @access private
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*/
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// If gettext isn't available
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if ( !function_exists('_') ) {
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function _($string) {
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return $string;
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}
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}
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if ( !function_exists('mb_substr') ):
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function mb_substr( $str, $start, $length=null, $encoding=null ) {
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return _mb_substr($str, $start, $length, $encoding);
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}
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endif;
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function _mb_substr( $str, $start, $length=null, $encoding=null ) {
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// the solution below, works only for utf-8, so in case of a different
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// charset, just use built-in substr
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$charset = get_option( 'blog_charset' );
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if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {
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return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
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}
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// use the regex unicode support to separate the UTF-8 characters into an array
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preg_match_all( '/./us', $str, $match );
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$chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
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return implode( '', $chars );
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}
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if ( !function_exists('hash_hmac') ):
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function hash_hmac($algo, $data, $key, $raw_output = false) {
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return _hash_hmac($algo, $data, $key, $raw_output);
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}
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endif;
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function _hash_hmac($algo, $data, $key, $raw_output = false) {
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$packs = array('md5' => 'H32', 'sha1' => 'H40');
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if ( !isset($packs[$algo]) )
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return false;
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$pack = $packs[$algo];
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if (strlen($key) > 64)
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$key = pack($pack, $algo($key));
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$key = str_pad($key, 64, chr(0));
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$ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
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$opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
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$hmac = $algo($opad . pack($pack, $algo($ipad . $data)));
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if ( $raw_output )
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return pack( $pack, $hmac );
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return $hmac;
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}
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if ( !function_exists('json_encode') ) {
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function json_encode( $string ) {
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global $wp_json;
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if ( !is_a($wp_json, 'Services_JSON') ) {
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require_once( ABSPATH . WPINC . '/class-json.php' );
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$wp_json = new Services_JSON();
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}
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return $wp_json->encodeUnsafe( $string );
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}
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}
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if ( !function_exists('json_decode') ) {
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function json_decode( $string, $assoc_array = false ) {
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global $wp_json;
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if ( !is_a($wp_json, 'Services_JSON') ) {
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require_once( ABSPATH . WPINC . '/class-json.php' );
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$wp_json = new Services_JSON();
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}
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$res = $wp_json->decode( $string );
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if ( $assoc_array )
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$res = _json_decode_object_helper( $res );
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return $res;
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}
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function _json_decode_object_helper($data) {
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if ( is_object($data) )
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$data = get_object_vars($data);
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return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
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}
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}
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if ( ! function_exists( 'hash_equals' ) ) :
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/**
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* Compare two strings in constant time.
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*
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* This function was added in PHP 5.6.
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* It can leak the length of a string.
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*
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* @since 3.9.2
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*
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* @param string $a Expected string.
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* @param string $b Actual string.
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* @return bool Whether strings are equal.
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*/
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function hash_equals( $a, $b ) {
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$a_length = strlen( $a );
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if ( $a_length !== strlen( $b ) ) {
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return false;
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}
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$result = 0;
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// Do not attempt to "optimize" this.
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for ( $i = 0; $i < $a_length; $i++ ) {
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$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
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}
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return $result === 0;
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}
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endif; |