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158
ap23/web/doku/inc/SafeFN.class.php
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158
ap23/web/doku/inc/SafeFN.class.php
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<?php
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/**
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* Class to safely store UTF-8 in a Filename
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*
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* Encodes a utf8 string using only the following characters 0-9a-z_.-%
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* characters 0-9a-z in the original string are preserved, "plain".
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* all other characters are represented in a substring that starts
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* with '%' are "converted".
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* The transition from converted substrings to plain characters is
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* marked with a '.'
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*
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* @author Christopher Smith <chris@jalakai.co.uk>
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* @date 2010-04-02
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*/
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class SafeFN {
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// 'safe' characters are a superset of $plain, $pre_indicator and $post_indicator
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private static $plain = '-./[_0123456789abcdefghijklmnopqrstuvwxyz'; // these characters aren't converted
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private static $pre_indicator = '%';
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private static $post_indicator = ']';
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/**
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* Convert an UTF-8 string to a safe ASCII String
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*
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* conversion process
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* - if codepoint is a plain or post_indicator character,
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* - if previous character was "converted", append post_indicator to output, clear "converted" flag
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* - append ascii byte for character to output
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* (continue to next character)
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*
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* - if codepoint is a pre_indicator character,
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* - append ascii byte for character to output, set "converted" flag
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* (continue to next character)
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*
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* (all remaining characters)
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* - reduce codepoint value for non-printable ASCII characters (0x00 - 0x1f). Space becomes our zero.
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* - convert reduced value to base36 (0-9a-z)
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* - append $pre_indicator characater followed by base36 string to output, set converted flag
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* (continue to next character)
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*
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* @param string $filename a utf8 string, should only include printable characters - not 0x00-0x1f
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* @return string an encoded representation of $filename using only 'safe' ASCII characters
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*
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* @author Christopher Smith <chris@jalakai.co.uk>
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*/
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public static function encode($filename) {
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return self::unicodeToSafe(\dokuwiki\Utf8\Unicode::fromUtf8($filename));
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}
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/**
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* decoding process
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* - split the string into substrings at any occurrence of pre or post indicator characters
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* - check the first character of the substring
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* - if its not a pre_indicator character
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* - if previous character was converted, skip over post_indicator character
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* - copy codepoint values of remaining characters to the output array
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* - clear any converted flag
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* (continue to next substring)
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*
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* _ else (its a pre_indicator character)
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* - if string length is 1, copy the post_indicator character to the output array
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* (continue to next substring)
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*
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* - else (string length > 1)
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* - skip the pre-indicator character and convert remaining string from base36 to base10
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* - increase codepoint value for non-printable ASCII characters (add 0x20)
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* - append codepoint to output array
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* (continue to next substring)
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*
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* @param string $filename a 'safe' encoded ASCII string,
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* @return string decoded utf8 representation of $filename
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*
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* @author Christopher Smith <chris@jalakai.co.uk>
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*/
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public static function decode($filename) {
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return \dokuwiki\Utf8\Unicode::toUtf8(self::safeToUnicode(strtolower($filename)));
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}
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public static function validatePrintableUtf8($printable_utf8) {
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return !preg_match('#[\x01-\x1f]#',$printable_utf8);
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}
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public static function validateSafe($safe) {
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return !preg_match('#[^'.self::$plain.self::$post_indicator.self::$pre_indicator.']#',$safe);
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}
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/**
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* convert an array of unicode codepoints into 'safe_filename' format
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*
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* @param array int $unicode an array of unicode codepoints
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* @return string the unicode represented in 'safe_filename' format
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*
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* @author Christopher Smith <chris@jalakai.co.uk>
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*/
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private static function unicodeToSafe($unicode) {
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$safe = '';
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$converted = false;
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foreach ($unicode as $codepoint) {
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if ($codepoint < 127 && (strpos(self::$plain.self::$post_indicator,chr($codepoint))!==false)) {
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if ($converted) {
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$safe .= self::$post_indicator;
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$converted = false;
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}
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$safe .= chr($codepoint);
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} else if ($codepoint == ord(self::$pre_indicator)) {
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$safe .= self::$pre_indicator;
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$converted = true;
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} else {
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$safe .= self::$pre_indicator.base_convert((string)($codepoint-32),10,36);
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$converted = true;
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}
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}
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if($converted) $safe .= self::$post_indicator;
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return $safe;
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}
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/**
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* convert a 'safe_filename' string into an array of unicode codepoints
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*
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* @param string $safe a filename in 'safe_filename' format
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* @return array int an array of unicode codepoints
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*
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* @author Christopher Smith <chris@jalakai.co.uk>
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*/
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private static function safeToUnicode($safe) {
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$unicode = array();
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$split = preg_split('#(?=['.self::$post_indicator.self::$pre_indicator.'])#',$safe,-1,PREG_SPLIT_NO_EMPTY);
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$converted = false;
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foreach ($split as $sub) {
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$len = strlen($sub);
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if ($sub[0] != self::$pre_indicator) {
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// plain (unconverted) characters, optionally starting with a post_indicator
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// set initial value to skip any post_indicator
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for ($i=($converted?1:0); $i < $len; $i++) {
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$unicode[] = ord($sub[$i]);
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}
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$converted = false;
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} else if ($len==1) {
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// a pre_indicator character in the real data
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$unicode[] = ord($sub);
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$converted = true;
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} else {
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// a single codepoint in base36, adjusted for initial 32 non-printable chars
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$unicode[] = 32 + (int)base_convert(substr($sub,1),36,10);
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$converted = true;
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}
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}
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return $unicode;
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}
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}
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