/libraries/idna_convert/uctc.php
PHP | 300 lines | 236 code | 14 blank | 50 comment | 84 complexity | 6591c9a5509bf525b29fc6ded3962d34 MD5 | raw file
Possible License(s): LGPL-2.1, GPL-2.0, MIT, BSD-3-Clause
- <?php
- /**
- * UCTC - The Unicode Transcoder
- *
- * Converts between various flavours of Unicode representations like UCS-4 or UTF-8
- * Supported schemes:
- * - UCS-4 Little Endian / Big Endian / Array (partially)
- * - UTF-16 Little Endian / Big Endian (not yet)
- * - UTF-8
- * - UTF-7
- * - UTF-7 IMAP (modified UTF-7)
- *
- * @package phlyMail Nahariya 4.0+ Default branch
- * @author Matthias Sommerfeld <mso@phlyLabs.de>
- * @copyright 2003-2009 phlyLabs Berlin, http://phlylabs.de
- * @version 0.0.6 2009-05-10
- */
- class uctc {
- private static $mechs = array('ucs4', /*'ucs4le', 'ucs4be', */'ucs4array', /*'utf16', 'utf16le', 'utf16be', */'utf8', 'utf7', 'utf7imap');
- private static $allow_overlong = false;
- private static $safe_mode;
- private static $safe_char;
- /**
- * The actual conversion routine
- *
- * @param mixed $data The data to convert, usually a string, array when converting from UCS-4 array
- * @param string $from Original encoding of the data
- * @param string $to Target encoding of the data
- * @param bool $safe_mode SafeMode tries to correct invalid codepoints
- * @return mixed False on failure, String or array on success, depending on target encoding
- * @access public
- * @since 0.0.1
- */
- public static function convert($data, $from, $to, $safe_mode = false, $safe_char = 0xFFFC)
- {
- self::$safe_mode = ($safe_mode) ? true : false;
- self::$safe_char = ($safe_char) ? $safe_char : 0xFFFC;
- if (self::$safe_mode) self::$allow_overlong = true;
- if (!in_array($from, self::$mechs)) throw new Exception('Invalid input format specified');
- if (!in_array($to, self::$mechs)) throw new Exception('Invalid output format specified');
- if ($from != 'ucs4array') eval('$data = self::'.$from.'_ucs4array($data);');
- if ($to != 'ucs4array') eval('$data = self::ucs4array_'.$to.'($data);');
- return $data;
- }
- /**
- * This converts an UTF-8 encoded string to its UCS-4 representation
- *
- * @param string $input The UTF-8 string to convert
- * @return array Array of 32bit values representing each codepoint
- * @access private
- */
- private static function utf8_ucs4array($input)
- {
- $output = array();
- $out_len = 0;
- $inp_len = strlen($input);
- $mode = 'next';
- $test = 'none';
- for ($k = 0; $k < $inp_len; ++$k) {
- $v = ord($input{$k}); // Extract byte from input string
- if ($v < 128) { // We found an ASCII char - put into stirng as is
- $output[$out_len] = $v;
- ++$out_len;
- if ('add' == $mode) {
- if (self::$safe_mode) {
- $output[$out_len-2] = self::$safe_char;
- $mode = 'next';
- } else {
- throw new Exception('Conversion from UTF-8 to UCS-4 failed: malformed input at byte '.$k);
- }
- }
- continue;
- }
- if ('next' == $mode) { // Try to find the next start byte; determine the width of the Unicode char
- $start_byte = $v;
- $mode = 'add';
- $test = 'range';
- if ($v >> 5 == 6) { // &110xxxxx 10xxxxx
- $next_byte = 0; // Tells, how many times subsequent bitmasks must rotate 6bits to the left
- $v = ($v - 192) << 6;
- } elseif ($v >> 4 == 14) { // &1110xxxx 10xxxxxx 10xxxxxx
- $next_byte = 1;
- $v = ($v - 224) << 12;
- } elseif ($v >> 3 == 30) { // &11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- $next_byte = 2;
- $v = ($v - 240) << 18;
- } elseif (self::$safe_mode) {
- $mode = 'next';
- $output[$out_len] = self::$safe_char;
- ++$out_len;
- continue;
- } else {
- throw new Exception('This might be UTF-8, but I don\'t understand it at byte '.$k);
- }
- if ($inp_len-$k-$next_byte < 2) {
- $output[$out_len] = self::$safe_char;
- $mode = 'no';
- continue;
- }
- if ('add' == $mode) {
- $output[$out_len] = (int) $v;
- ++$out_len;
- continue;
- }
- }
- if ('add' == $mode) {
- if (!self::$allow_overlong && $test == 'range') {
- $test = 'none';
- if (($v < 0xA0 && $start_byte == 0xE0) || ($v < 0x90 && $start_byte == 0xF0) || ($v > 0x8F && $start_byte == 0xF4)) {
- throw new Exception('Bogus UTF-8 character detected (out of legal range) at byte '.$k);
- }
- }
- if ($v >> 6 == 2) { // Bit mask must be 10xxxxxx
- $v = ($v-128) << ($next_byte*6);
- $output[($out_len-1)] += $v;
- --$next_byte;
- } else {
- if (self::$safe_mode) {
- $output[$out_len-1] = ord(self::$safe_char);
- $k--;
- $mode = 'next';
- continue;
- } else {
- throw new Exception('Conversion from UTF-8 to UCS-4 failed: malformed input at byte '.$k);
- }
- }
- if ($next_byte < 0) {
- $mode = 'next';
- }
- }
- } // for
- return $output;
- }
- /**
- * Convert UCS-4 string into UTF-8 string
- * See utf8_ucs4array() for details
- * @access private
- */
- private static function ucs4array_utf8($input)
- {
- $output = '';
- foreach ($input as $v) {
- if ($v < 128) { // 7bit are transferred literally
- $output .= chr($v);
- } elseif ($v < (1 << 11)) { // 2 bytes
- $output .= chr(192+($v >> 6)).chr(128+($v & 63));
- } elseif ($v < (1 << 16)) { // 3 bytes
- $output .= chr(224+($v >> 12)).chr(128+(($v >> 6) & 63)).chr(128+($v & 63));
- } elseif ($v < (1 << 21)) { // 4 bytes
- $output .= chr(240+($v >> 18)).chr(128+(($v >> 12) & 63)).chr(128+(($v >> 6) & 63)).chr(128+($v & 63));
- } elseif (self::$safe_mode) {
- $output .= self::$safe_char;
- } else {
- throw new Exception('Conversion from UCS-4 to UTF-8 failed: malformed input at byte '.$k);
- }
- }
- return $output;
- }
- private static function utf7imap_ucs4array($input)
- {
- return self::utf7_ucs4array(str_replace(',', '/', $input), '&');
- }
- private static function utf7_ucs4array($input, $sc = '+')
- {
- $output = array();
- $out_len = 0;
- $inp_len = strlen($input);
- $mode = 'd';
- $b64 = '';
- for ($k = 0; $k < $inp_len; ++$k) {
- $c = $input{$k};
- if (0 == ord($c)) continue; // Ignore zero bytes
- if ('b' == $mode) {
- // Sequence got terminated
- if (!preg_match('![A-Za-z0-9/'.preg_quote($sc, '!').']!', $c)) {
- if ('-' == $c) {
- if ($b64 == '') {
- $output[$out_len] = ord($sc);
- $out_len++;
- $mode = 'd';
- continue;
- }
- }
- $tmp = base64_decode($b64);
- $tmp = substr($tmp, -1 * (strlen($tmp) % 2));
- for ($i = 0; $i < strlen($tmp); $i++) {
- if ($i % 2) {
- $output[$out_len] += ord($tmp{$i});
- $out_len++;
- } else {
- $output[$out_len] = ord($tmp{$i}) << 8;
- }
- }
- $mode = 'd';
- $b64 = '';
- continue;
- } else {
- $b64 .= $c;
- }
- }
- if ('d' == $mode) {
- if ($sc == $c) {
- $mode = 'b';
- continue;
- }
- $output[$out_len] = ord($c);
- $out_len++;
- }
- }
- return $output;
- }
- private static function ucs4array_utf7imap($input)
- {
- return str_replace('/', ',', self::ucs4array_utf7($input, '&'));
- }
- private static function ucs4array_utf7($input, $sc = '+')
- {
- $output = '';
- $mode = 'd';
- $b64 = '';
- while (true) {
- $v = (!empty($input)) ? array_shift($input) : false;
- $is_direct = (false !== $v) ? (0x20 <= $v && $v <= 0x7e && $v != ord($sc)) : true;
- if ($mode == 'b') {
- if ($is_direct) {
- if ($b64 == chr(0).$sc) {
- $output .= $sc.'-';
- $b64 = '';
- } elseif ($b64) {
- $output .= $sc.str_replace('=', '', base64_encode($b64)).'-';
- $b64 = '';
- }
- $mode = 'd';
- } elseif (false !== $v) {
- $b64 .= chr(($v >> 8) & 255). chr($v & 255);
- }
- }
- if ($mode == 'd' && false !== $v) {
- if ($is_direct) {
- $output .= chr($v);
- } else {
- $b64 = chr(($v >> 8) & 255). chr($v & 255);
- $mode = 'b';
- }
- }
- if (false === $v && $b64 == '') break;
- }
- return $output;
- }
- /**
- * Convert UCS-4 array into UCS-4 string (Little Endian at the moment)
- * @access private
- */
- private static function ucs4array_ucs4($input)
- {
- $output = '';
- foreach ($input as $v) {
- $output .= chr(($v >> 24) & 255).chr(($v >> 16) & 255).chr(($v >> 8) & 255).chr($v & 255);
- }
- return $output;
- }
- /**
- * Convert UCS-4 string (LE in the moment) into UCS-4 garray
- * @access private
- */
- private static function ucs4_ucs4array($input)
- {
- $output = array();
- $inp_len = strlen($input);
- // Input length must be dividable by 4
- if ($inp_len % 4) {
- throw new Exception('Input UCS4 string is broken');
- }
- // Empty input - return empty output
- if (!$inp_len) return $output;
- for ($i = 0, $out_len = -1; $i < $inp_len; ++$i) {
- if (!($i % 4)) { // Increment output position every 4 input bytes
- $out_len++;
- $output[$out_len] = 0;
- }
- $output[$out_len] += ord($input{$i}) << (8 * (3 - ($i % 4) ) );
- }
- return $output;
- }
- }
- ?>