/system/utf8/to_unicode.php
PHP | 145 lines | 98 code | 9 blank | 38 comment | 21 complexity | be6a1952400f6119a5b0d82ea05ab50e MD5 | raw file
Possible License(s): BSD-3-Clause
- <?php defined('SYSPATH') or die('No direct script access.');
- /**
- * UTF8::to_unicode
- *
- * @package Kohana
- * @author Kohana Team
- * @copyright (c) 2007-2011 Kohana Team
- * @copyright (c) 2005 Harry Fuecks
- * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
- */
- function _to_unicode($str)
- {
- // Cached expected number of octets after the current octet until the beginning of the next UTF8 character sequence
- $m_state = 0;
- // Cached Unicode character
- $m_ucs4 = 0;
- // Cached expected number of octets in the current sequence
- $m_bytes = 1;
- $out = array();
- $len = strlen($str);
- for ($i = 0; $i < $len; $i++)
- {
- $in = ord($str[$i]);
- if ($m_state == 0)
- {
- // When m_state is zero we expect either a US-ASCII character or a multi-octet sequence.
- if (0 == (0x80 & $in))
- {
- // US-ASCII, pass straight through.
- $out[] = $in;
- $m_bytes = 1;
- }
- elseif (0xC0 == (0xE0 & $in))
- {
- // First octet of 2 octet sequence
- $m_ucs4 = $in;
- $m_ucs4 = ($m_ucs4 & 0x1F) << 6;
- $m_state = 1;
- $m_bytes = 2;
- }
- elseif (0xE0 == (0xF0 & $in))
- {
- // First octet of 3 octet sequence
- $m_ucs4 = $in;
- $m_ucs4 = ($m_ucs4 & 0x0F) << 12;
- $m_state = 2;
- $m_bytes = 3;
- }
- elseif (0xF0 == (0xF8 & $in))
- {
- // First octet of 4 octet sequence
- $m_ucs4 = $in;
- $m_ucs4 = ($m_ucs4 & 0x07) << 18;
- $m_state = 3;
- $m_bytes = 4;
- }
- elseif (0xF8 == (0xFC & $in))
- {
- /** First octet of 5 octet sequence.
- *
- * This is illegal because the encoded codepoint must be either
- * (a) not the shortest form or
- * (b) outside the Unicode range of 0-0x10FFFF.
- * Rather than trying to resynchronize, we will carry on until the end
- * of the sequence and let the later error handling code catch it.
- **/
- $m_ucs4 = $in;
- $m_ucs4 = ($m_ucs4 & 0x03) << 24;
- $m_state = 4;
- $m_bytes = 5;
- }
- elseif (0xFC == (0xFE & $in))
- {
- // First octet of 6 octet sequence, see comments for 5 octet sequence.
- $m_ucs4 = $in;
- $m_ucs4 = ($m_ucs4 & 1) << 30;
- $m_state = 5;
- $m_bytes = 6;
- }
- else
- {
- // Current octet is neither in the US-ASCII range nor a legal first octet of a multi-octet sequence.
- trigger_error('UTF8::to_unicode: Illegal sequence identifier in UTF-8 at byte '.$i, E_USER_WARNING);
- return FALSE;
- }
- }
- else
- {
- // When m_state is non-zero, we expect a continuation of the multi-octet sequence
- if (0x80 == (0xC0 & $in))
- {
- // Legal continuation
- $shift = ($m_state - 1) * 6;
- $tmp = $in;
- $tmp = ($tmp & 0x0000003F) << $shift;
- $m_ucs4 |= $tmp;
- // End of the multi-octet sequence. mUcs4 now contains the final Unicode codepoint to be output
- if (0 == --$m_state)
- {
- // Check for illegal sequences and codepoints
- // From Unicode 3.1, non-shortest form is illegal
- if (((2 == $m_bytes) AND ($m_ucs4 < 0x0080)) OR
- ((3 == $m_bytes) AND ($m_ucs4 < 0x0800)) OR
- ((4 == $m_bytes) AND ($m_ucs4 < 0x10000)) OR
- (4 < $m_bytes) OR
- // From Unicode 3.2, surrogate characters are illegal
- (($m_ucs4 & 0xFFFFF800) == 0xD800) OR
- // Codepoints outside the Unicode range are illegal
- ($m_ucs4 > 0x10FFFF))
- {
- trigger_error('UTF8::to_unicode: Illegal sequence or codepoint in UTF-8 at byte '.$i, E_USER_WARNING);
- return FALSE;
- }
- if (0xFEFF != $m_ucs4)
- {
- // BOM is legal but we don't want to output it
- $out[] = $m_ucs4;
- }
- // Initialize UTF-8 cache
- $m_state = 0;
- $m_ucs4 = 0;
- $m_bytes = 1;
- }
- }
- else
- {
- // ((0xC0 & (*in) != 0x80) AND (m_state != 0))
- // Incomplete multi-octet sequence
- throw new UTF8_Exception("UTF8::to_unicode: Incomplete multi-octet sequence in UTF-8 at byte ':byte'", array(
- ':byte' => $i,
- ));
- }
- }
- }
- return $out;
- }