270 lines
9.1 KiB
PHP
270 lines
9.1 KiB
PHP
<?php
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/**
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* @version $Id$
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* Tools for conversion between UTF-8 and unicode
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* The Original Code is Mozilla Communicator client code.
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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* Ported to PHP by Henri Sivonen (http://hsivonen.iki.fi)
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* Slight modifications to fit with phputf8 library by Harry Fuecks (hfuecks gmail com)
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* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUTF8ToUnicode.cpp
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* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUnicodeToUTF8.cpp
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* @see http://hsivonen.iki.fi/php-utf8/
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* @package utf8
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* @subpackage unicode
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*/
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//--------------------------------------------------------------------
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/**
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* Takes an UTF-8 string and returns an array of ints representing the
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* Unicode characters. Astral planes are supported ie. the ints in the
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* output can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
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* are not allowed.
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* Returns false if the input string isn't a valid UTF-8 octet sequence
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* and raises a PHP error at level E_USER_WARNING
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* Note: this function has been modified slightly in this library to
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* trigger errors on encountering bad bytes
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* @author <hsivonen@iki.fi>
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* @param string UTF-8 encoded string
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* @return mixed array of unicode code points or FALSE if UTF-8 invalid
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* @see utf8_from_unicode
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* @see http://hsivonen.iki.fi/php-utf8/
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* @package utf8
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* @subpackage unicode
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*/
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function utf8_to_unicode($str) {
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$mState = 0; // cached expected number of octets after the current octet
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// 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; $i++) {
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$in = ord($str{$i});
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if ( $mState == 0) {
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// When mState is zero we expect either a US-ASCII character or a
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// multi-octet sequence.
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if (0 == (0x80 & ($in))) {
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// US-ASCII, pass straight through.
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$out[] = $in;
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$mBytes = 1;
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} else if (0xC0 == (0xE0 & ($in))) {
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// First octet of 2 octet sequence
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$mUcs4 = ($in);
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$mUcs4 = ($mUcs4 & 0x1F) << 6;
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$mState = 1;
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$mBytes = 2;
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} else if (0xE0 == (0xF0 & ($in))) {
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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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} else if (0xF0 == (0xF8 & ($in))) {
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// First octet of 4 octet sequence
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$mUcs4 = ($in);
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$mUcs4 = ($mUcs4 & 0x07) << 18;
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$mState = 3;
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$mBytes = 4;
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} else if (0xF8 == (0xFC & ($in))) {
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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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*/
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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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} else if (0xFC == (0xFE & ($in))) {
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// First octet of 6 octet sequence, see comments for 5 octet sequence.
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$mUcs4 = ($in);
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$mUcs4 = ($mUcs4 & 1) << 30;
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$mState = 5;
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$mBytes = 6;
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} else {
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/* Current octet is neither in the US-ASCII range nor a legal first
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* octet of a multi-octet sequence.
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*/
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trigger_error(
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'utf8_to_unicode: Illegal sequence identifier '.
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'in UTF-8 at byte '.$i,
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E_USER_WARNING
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);
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return FALSE;
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}
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} else {
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// When mState is non-zero, we expect a continuation of the multi-octet
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// sequence
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if (0x80 == (0xC0 & ($in))) {
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// Legal continuation.
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$shift = ($mState - 1) * 6;
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$tmp = $in;
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$tmp = ($tmp & 0x0000003F) << $shift;
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$mUcs4 |= $tmp;
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/**
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* End of the multi-octet sequence. mUcs4 now contains the final
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* Unicode codepoint to be output
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*/
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if (0 == --$mState) {
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/*
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* Check for illegal sequences and codepoints.
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*/
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// From Unicode 3.1, non-shortest form is illegal
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if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
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((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
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((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
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(4 < $mBytes) ||
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// From Unicode 3.2, surrogate characters are illegal
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(($mUcs4 & 0xFFFFF800) == 0xD800) ||
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// Codepoints outside the Unicode range are illegal
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($mUcs4 > 0x10FFFF)) {
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trigger_error(
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'utf8_to_unicode: Illegal sequence or codepoint '.
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'in UTF-8 at byte '.$i,
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E_USER_WARNING
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);
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return FALSE;
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}
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if (0xFEFF != $mUcs4) {
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// BOM is legal but we don't want to output it
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$out[] = $mUcs4;
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}
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//initialize UTF8 cache
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$mState = 0;
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$mUcs4 = 0;
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$mBytes = 1;
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}
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} else {
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/**
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*((0xC0 & (*in) != 0x80) && (mState != 0))
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* Incomplete multi-octet sequence.
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*/
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trigger_error(
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'utf8_to_unicode: Incomplete multi-octet '.
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' sequence in UTF-8 at byte '.$i,
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E_USER_WARNING
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);
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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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}
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//--------------------------------------------------------------------
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/**
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* Takes an array of ints representing the Unicode characters and returns
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* a UTF-8 string. Astral planes are supported ie. the ints in the
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* input can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
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* are not allowed.
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* Returns false if the input array contains ints that represent
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* surrogates or are outside the Unicode range
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* and raises a PHP error at level E_USER_WARNING
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* Note: this function has been modified slightly in this library to use
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* output buffering to concatenate the UTF-8 string (faster) as well as
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* reference the array by it's keys
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* @param array of unicode code points representing a string
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* @return mixed UTF-8 string or FALSE if array contains invalid code points
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* @author <hsivonen@iki.fi>
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* @see utf8_to_unicode
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* @see http://hsivonen.iki.fi/php-utf8/
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* @package utf8
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* @subpackage unicode
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*/
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function utf8_from_unicode($arr) {
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ob_start();
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foreach (array_keys($arr) as $k) {
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# ASCII range (including control chars)
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if ( ($arr[$k] >= 0) && ($arr[$k] <= 0x007f) ) {
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echo chr($arr[$k]);
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# 2 byte sequence
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} else if ($arr[$k] <= 0x07ff) {
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echo chr(0xc0 | ($arr[$k] >> 6));
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echo chr(0x80 | ($arr[$k] & 0x003f));
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# Byte order mark (skip)
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} else if($arr[$k] == 0xFEFF) {
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// nop -- zap the BOM
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# Test for illegal surrogates
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} else if ($arr[$k] >= 0xD800 && $arr[$k] <= 0xDFFF) {
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// found a surrogate
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trigger_error(
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'utf8_from_unicode: Illegal surrogate '.
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'at index: '.$k.', value: '.$arr[$k],
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E_USER_WARNING
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);
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return FALSE;
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# 3 byte sequence
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} else if ($arr[$k] <= 0xffff) {
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echo chr(0xe0 | ($arr[$k] >> 12));
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echo chr(0x80 | (($arr[$k] >> 6) & 0x003f));
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echo chr(0x80 | ($arr[$k] & 0x003f));
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# 4 byte sequence
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} else if ($arr[$k] <= 0x10ffff) {
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echo chr(0xf0 | ($arr[$k] >> 18));
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echo chr(0x80 | (($arr[$k] >> 12) & 0x3f));
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echo chr(0x80 | (($arr[$k] >> 6) & 0x3f));
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echo chr(0x80 | ($arr[$k] & 0x3f));
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} else {
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trigger_error(
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'utf8_from_unicode: Codepoint out of Unicode range '.
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'at index: '.$k.', value: '.$arr[$k],
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E_USER_WARNING
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);
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// out of range
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return FALSE;
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}
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}
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$result = ob_get_contents();
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ob_end_clean();
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return $result;
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}
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