checked in initial customized verison for Archlinux32HEADmaster

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diff --git a/include/utf8/utils/validation.php b/include/utf8/utils/validation.php
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+<?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)))
+			{
+				$mBytes = 1; // US-ASCII, pass straight through
+			}
+			else if (0xC0 == (0xE0 & ($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;
+					$mBytes = 1;
+				}
+			}
+			else
+			{
+				/**
+				*((0xC0 & (*in) != 0x80) && (mState != 0))
+				* Incomplete multi-octet sequence.
+				*/
+
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+/**
+* Tests whether a string complies as UTF-8. This will be much
+* faster than utf8_is_valid, but will pass five and six octet
+* UTF-8 sequences, which are not supported by Unicode and
+* so cannot be displayed correctly in a browser. In other words
+* it is not as strict as utf8_is_valid but it's faster. If you use
+* is to validate user input, you place yourself at the risk that
+* attackers will be able to inject 5 and 6 byte sequences (which
+* may or may not be a significant risk, depending on what you are
+* are doing)
+* Note: Does not pass five and six octet UTF-8 sequences anymore in
+*       in the unit tests.
+* @see utf8_is_valid
+* @see http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php#54805
+* @param string UTF-8 string to check
+* @return boolean TRUE if string is valid UTF-8
+* @package utf8
+* @subpackage validation
+*/
+function utf8_compliant($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);
+}