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