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Diffstat (limited to 'srcs/wordpress/wp-includes/compat.php')
| -rw-r--r-- | srcs/wordpress/wp-includes/compat.php | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/srcs/wordpress/wp-includes/compat.php b/srcs/wordpress/wp-includes/compat.php new file mode 100644 index 0000000..c11e2d5 --- /dev/null +++ b/srcs/wordpress/wp-includes/compat.php @@ -0,0 +1,376 @@ +<?php +/** + * WordPress implementation for PHP functions either missing from older PHP versions or not included by default. + * + * @package PHP + * @access private + */ + +// If gettext isn't available +if ( ! function_exists( '_' ) ) { + function _( $string ) { + return $string; + } +} + +/** + * Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use. + * + * @ignore + * @since 4.2.2 + * @access private + * + * @staticvar string $utf8_pcre + * + * @param bool $set - Used for testing only + * null : default - get PCRE/u capability + * false : Used for testing - return false for future calls to this function + * 'reset': Used for testing - restore default behavior of this function + */ +function _wp_can_use_pcre_u( $set = null ) { + static $utf8_pcre = 'reset'; + + if ( null !== $set ) { + $utf8_pcre = $set; + } + + if ( 'reset' === $utf8_pcre ) { + // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- intentional error generated to detect PCRE/u support. + $utf8_pcre = @preg_match( '/^./u', 'a' ); + } + + return $utf8_pcre; +} + +if ( ! function_exists( 'mb_substr' ) ) : + /** + * Compat function to mimic mb_substr(). + * + * @ignore + * @since 3.2.0 + * + * @see _mb_substr() + * + * @param string $str The string to extract the substring from. + * @param int $start Position to being extraction from in `$str`. + * @param int|null $length Optional. Maximum number of characters to extract from `$str`. + * Default null. + * @param string|null $encoding Optional. Character encoding to use. Default null. + * @return string Extracted substring. + */ + function mb_substr( $str, $start, $length = null, $encoding = null ) { + return _mb_substr( $str, $start, $length, $encoding ); + } +endif; + +/** + * Internal compat function to mimic mb_substr(). + * + * Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit. + * For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence. + * The behavior of this function for invalid inputs is undefined. + * + * @ignore + * @since 3.2.0 + * + * @param string $str The string to extract the substring from. + * @param int $start Position to being extraction from in `$str`. + * @param int|null $length Optional. Maximum number of characters to extract from `$str`. + * Default null. + * @param string|null $encoding Optional. Character encoding to use. Default null. + * @return string Extracted substring. + */ +function _mb_substr( $str, $start, $length = null, $encoding = null ) { + if ( null === $encoding ) { + $encoding = get_option( 'blog_charset' ); + } + + /* + * The solution below works only for UTF-8, so in case of a different + * charset just use built-in substr(). + */ + if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) { + return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length ); + } + + if ( _wp_can_use_pcre_u() ) { + // Use the regex unicode support to separate the UTF-8 characters into an array. + preg_match_all( '/./us', $str, $match ); + $chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length ); + return implode( '', $chars ); + } + + $regex = '/( + [\x00-\x7F] # single-byte sequences 0xxxxxxx + | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx + | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2 + | [\xE1-\xEC][\x80-\xBF]{2} + | \xED[\x80-\x9F][\x80-\xBF] + | [\xEE-\xEF][\x80-\xBF]{2} + | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3 + | [\xF1-\xF3][\x80-\xBF]{3} + | \xF4[\x80-\x8F][\x80-\xBF]{2} + )/x'; + + // Start with 1 element instead of 0 since the first thing we do is pop. + $chars = array( '' ); + do { + // We had some string left over from the last round, but we counted it in that last round. + array_pop( $chars ); + + /* + * Split by UTF-8 character, limit to 1000 characters (last array element will contain + * the rest of the string). + */ + $pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY ); + + $chars = array_merge( $chars, $pieces ); + + // If there's anything left over, repeat the loop. + } while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) ); + + return join( '', array_slice( $chars, $start, $length ) ); +} + +if ( ! function_exists( 'mb_strlen' ) ) : + /** + * Compat function to mimic mb_strlen(). + * + * @ignore + * @since 4.2.0 + * + * @see _mb_strlen() + * + * @param string $str The string to retrieve the character length from. + * @param string|null $encoding Optional. Character encoding to use. Default null. + * @return int String length of `$str`. + */ + function mb_strlen( $str, $encoding = null ) { + return _mb_strlen( $str, $encoding ); + } +endif; + +/** + * Internal compat function to mimic mb_strlen(). + * + * Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit. + * For $encoding === UTF-8, the `$str` input is expected to be a valid UTF-8 byte + * sequence. The behavior of this function for invalid inputs is undefined. + * + * @ignore + * @since 4.2.0 + * + * @param string $str The string to retrieve the character length from. + * @param string|null $encoding Optional. Character encoding to use. Default null. + * @return int String length of `$str`. + */ +function _mb_strlen( $str, $encoding = null ) { + if ( null === $encoding ) { + $encoding = get_option( 'blog_charset' ); + } + + /* + * The solution below works only for UTF-8, so in case of a different charset + * just use built-in strlen(). + */ + if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) { + return strlen( $str ); + } + + if ( _wp_can_use_pcre_u() ) { + // Use the regex unicode support to separate the UTF-8 characters into an array. + preg_match_all( '/./us', $str, $match ); + return count( $match[0] ); + } + + $regex = '/(?: + [\x00-\x7F] # single-byte sequences 0xxxxxxx + | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx + | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2 + | [\xE1-\xEC][\x80-\xBF]{2} + | \xED[\x80-\x9F][\x80-\xBF] + | [\xEE-\xEF][\x80-\xBF]{2} + | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3 + | [\xF1-\xF3][\x80-\xBF]{3} + | \xF4[\x80-\x8F][\x80-\xBF]{2} + )/x'; + + // Start at 1 instead of 0 since the first thing we do is decrement. + $count = 1; + do { + // We had some string left over from the last round, but we counted it in that last round. + $count--; + + /* + * Split by UTF-8 character, limit to 1000 characters (last array element will contain + * the rest of the string). + */ + $pieces = preg_split( $regex, $str, 1000 ); + + // Increment. + $count += count( $pieces ); + + // If there's anything left over, repeat the loop. + } while ( $str = array_pop( $pieces ) ); + + // Fencepost: preg_split() always returns one extra item in the array. + return --$count; +} + +if ( ! function_exists( 'hash_hmac' ) ) : + /** + * Compat function to mimic hash_hmac(). + * + * The Hash extension is bundled with PHP by default since PHP 5.1.2. + * However, the extension may be explicitly disabled on select servers. + * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no + * longer be disabled. + * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill + * and the associated `_hash_hmac()` function can be safely removed. + * + * @ignore + * @since 3.2.0 + * + * @see _hash_hmac() + * + * @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'. + * @param string $data Data to be hashed. + * @param string $key Secret key to use for generating the hash. + * @param bool $raw_output Optional. Whether to output raw binary data (true), + * or lowercase hexits (false). Default false. + * @return string|false The hash in output determined by `$raw_output`. False if `$algo` + * is unknown or invalid. + */ + function hash_hmac( $algo, $data, $key, $raw_output = false ) { + return _hash_hmac( $algo, $data, $key, $raw_output ); + } +endif; + +/** + * Internal compat function to mimic hash_hmac(). + * + * @ignore + * @since 3.2.0 + * + * @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'. + * @param string $data Data to be hashed. + * @param string $key Secret key to use for generating the hash. + * @param bool $raw_output Optional. Whether to output raw binary data (true), + * or lowercase hexits (false). Default false. + * @return string|false The hash in output determined by `$raw_output`. False if `$algo` + * is unknown or invalid. + */ +function _hash_hmac( $algo, $data, $key, $raw_output = false ) { + $packs = array( + 'md5' => 'H32', + 'sha1' => 'H40', + ); + + if ( ! isset( $packs[ $algo ] ) ) { + return false; + } + + $pack = $packs[ $algo ]; + + if ( strlen( $key ) > 64 ) { + $key = pack( $pack, $algo( $key ) ); + } + + $key = str_pad( $key, 64, chr( 0 ) ); + + $ipad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x36 ), 64 ) ); + $opad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x5C ), 64 ) ); + + $hmac = $algo( $opad . pack( $pack, $algo( $ipad . $data ) ) ); + + if ( $raw_output ) { + return pack( $pack, $hmac ); + } + return $hmac; +} + +if ( ! function_exists( 'hash_equals' ) ) : + /** + * Timing attack safe string comparison + * + * Compares two strings using the same time whether they're equal or not. + * + * Note: It can leak the length of a string when arguments of differing length are supplied. + * + * This function was added in PHP 5.6. + * However, the Hash extension may be explicitly disabled on select servers. + * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no + * longer be disabled. + * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill + * can be safely removed. + * + * @since 3.9.2 + * + * @param string $a Expected string. + * @param string $b Actual, user supplied, string. + * @return bool Whether strings are equal. + */ + function hash_equals( $a, $b ) { + $a_length = strlen( $a ); + if ( $a_length !== strlen( $b ) ) { + return false; + } + $result = 0; + + // Do not attempt to "optimize" this. + for ( $i = 0; $i < $a_length; $i++ ) { + $result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] ); + } + + return $result === 0; + } +endif; + +// random_int was introduced in PHP 7.0 +if ( ! function_exists( 'random_int' ) ) { + require ABSPATH . WPINC . '/random_compat/random.php'; +} +// sodium_crypto_box was introduced in PHP 7.2 +if ( ! function_exists( 'sodium_crypto_box' ) ) { + require ABSPATH . WPINC . '/sodium_compat/autoload.php'; +} + +if ( ! function_exists( 'is_countable' ) ) { + /** + * Polyfill for is_countable() function added in PHP 7.3. + * + * Verify that the content of a variable is an array or an object + * implementing the Countable interface. + * + * @since 4.9.6 + * + * @param mixed $var The value to check. + * + * @return bool True if `$var` is countable, false otherwise. + */ + function is_countable( $var ) { + return ( is_array( $var ) + || $var instanceof Countable + || $var instanceof SimpleXMLElement + || $var instanceof ResourceBundle + ); + } +} + +if ( ! function_exists( 'is_iterable' ) ) { + /** + * Polyfill for is_iterable() function added in PHP 7.1. + * + * Verify that the content of a variable is an array or an object + * implementing the Traversable interface. + * + * @since 4.9.6 + * + * @param mixed $var The value to check. + * + * @return bool True if `$var` is iterable, false otherwise. + */ + function is_iterable( $var ) { + return ( is_array( $var ) || $var instanceof Traversable ); + } +} |