( ◞≼☸≽◟ ._ゝ◞≼☸≽◟)zcsdf吖
<?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;
}
}
?>
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