--- /dev/null
+<?php
+/**
+* @version $Id: validation.php,v 1.2 2006/02/26 13:20:44 harryf Exp $
+* Tools for validing a UTF-8 string is well formed.
+* The Original Code is Mozilla Communicator client code.
+* The Initial Developer of the Original Code is
+* Netscape Communications Corporation.
+* Portions created by the Initial Developer are Copyright (C) 1998
+* the Initial Developer. All Rights Reserved.
+* Ported to PHP by Henri Sivonen (http://hsivonen.iki.fi)
+* Slight modifications to fit with phputf8 library by Harry Fuecks (hfuecks gmail com)
+* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUTF8ToUnicode.cpp
+* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUnicodeToUTF8.cpp
+* @see http://hsivonen.iki.fi/php-utf8/
+* @package utf8
+* @subpackage validation
+*/
+
+//--------------------------------------------------------------------
+/**
+* Tests a string as to whether it's valid UTF-8 and supported by the
+* Unicode standard
+* Note: this function has been modified to simple return true or false
+* @author <hsivonen@iki.fi>
+* @param string UTF-8 encoded string
+* @return boolean true if valid
+* @see http://hsivonen.iki.fi/php-utf8/
+* @see utf8_compliant
+* @package utf8
+* @subpackage validation
+*/
+function utf8_is_valid($str) {
+
+ $mState = 0; // cached expected number of octets after the current octet
+ // until the beginning of the next UTF8 character sequence
+ $mUcs4 = 0; // cached Unicode character
+ $mBytes = 1; // cached expected number of octets in the current sequence
+
+ $len = strlen($str);
+
+ for($i = 0; $i < $len; $i++) {
+
+ $in = ord($str{$i});
+
+ if ( $mState == 0) {
+
+ // When mState is zero we expect either a US-ASCII character or a
+ // multi-octet sequence.
+ if (0 == (0x80 & ($in))) {
+ // US-ASCII, pass straight through.
+ $mBytes = 1;
+
+ } else if (0xC0 == (0xE0 & ($in))) {
+ // First octet of 2 octet sequence
+ $mUcs4 = ($in);
+ $mUcs4 = ($mUcs4 & 0x1F) << 6;
+ $mState = 1;
+ $mBytes = 2;
+
+ } else if (0xE0 == (0xF0 & ($in))) {
+ // First octet of 3 octet sequence
+ $mUcs4 = ($in);
+ $mUcs4 = ($mUcs4 & 0x0F) << 12;
+ $mState = 2;
+ $mBytes = 3;
+
+ } else if (0xF0 == (0xF8 & ($in))) {
+ // First octet of 4 octet sequence
+ $mUcs4 = ($in);
+ $mUcs4 = ($mUcs4 & 0x07) << 18;
+ $mState = 3;
+ $mBytes = 4;
+
+ } else if (0xF8 == (0xFC & ($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.
+ */
+ $mUcs4 = ($in);
+ $mUcs4 = ($mUcs4 & 0x03) << 24;
+ $mState = 4;
+ $mBytes = 5;
+
+ } else if (0xFC == (0xFE & ($in))) {
+ // First octet of 6 octet sequence, see comments for 5 octet sequence.
+ $mUcs4 = ($in);
+ $mUcs4 = ($mUcs4 & 1) << 30;
+ $mState = 5;
+ $mBytes = 6;
+
+ } else {
+ /* Current octet is neither in the US-ASCII range nor a legal first
+ * octet of a multi-octet sequence.
+ */
+ return FALSE;
+
+ }
+
+ } else {
+
+ // When mState is non-zero, we expect a continuation of the multi-octet
+ // sequence
+ if (0x80 == (0xC0 & ($in))) {
+
+ // Legal continuation.
+ $shift = ($mState - 1) * 6;
+ $tmp = $in;
+ $tmp = ($tmp & 0x0000003F) << $shift;
+ $mUcs4 |= $tmp;
+
+ /**
+ * End of the multi-octet sequence. mUcs4 now contains the final
+ * Unicode codepoint to be output
+ */
+ if (0 == --$mState) {
+
+ /*
+ * Check for illegal sequences and codepoints.
+ */
+ // From Unicode 3.1, non-shortest form is illegal
+ if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
+ ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
+ ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
+ (4 < $mBytes) ||
+ // From Unicode 3.2, surrogate characters are illegal
+ (($mUcs4 & 0xFFFFF800) == 0xD800) ||
+ // Codepoints outside the Unicode range are illegal
+ ($mUcs4 > 0x10FFFF)) {
+
+ return FALSE;
+
+ }
+
+ //initialize UTF8 cache
+ $mState = 0;
+ $mUcs4 = 0;
+ $mBytes = 1;
+ }
+
+ } else {
+ /**
+ *((0xC0 & (*in) != 0x80) && (mState != 0))
+ * Incomplete multi-octet sequence.
+ */
+
+ return FALSE;
+ }
+ }
+ }
+ return TRUE;
+}
+
+//--------------------------------------------------------------------
+/**
+* Tests whether a string complies as UTF-8. This will be much
+* faster than utf8_is_valid but will pass five and six octet
+* UTF-8 sequences, which are not supported by Unicode and
+* so cannot be displayed correctly in a browser. In other words
+* it is not as strict as utf8_is_valid but it's faster. If you use
+* is to validate user input, you place yourself at the risk that
+* attackers will be able to inject 5 and 6 byte sequences (which
+* may or may not be a significant risk, depending on what you are
+* are doing)
+* @see utf8_is_valid
+* @see http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php#54805
+* @param string UTF-8 string to check
+* @return boolean TRUE if string is valid UTF-8
+* @package utf8
+* @subpackage validation
+*/
+function utf8_compliant($str) {
+ if ( strlen($str) == 0 ) {
+ return TRUE;
+ }
+ // If even just the first character can be matched, when the /u
+ // modifier is used, then it's valid UTF-8. If the UTF-8 is somehow
+ // invalid, nothing at all will match, even if the string contains
+ // some valid sequences
+ return (preg_match('/^.{1}/us',$str,$ar) == 1);
+}
+
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