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