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Diffstat (limited to 'include/utf8/utils/unicode.php')
| -rw-r--r-- | include/utf8/utils/unicode.php | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/include/utf8/utils/unicode.php b/include/utf8/utils/unicode.php new file mode 100644 index 0000000..f0e86cb --- /dev/null +++ b/include/utf8/utils/unicode.php @@ -0,0 +1,241 @@ +<?php + +/** +* @version $Id: unicode.php,v 1.2 2006/02/26 13:20:44 harryf Exp $ +* Tools for conversion between UTF-8 and unicode +* 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 unicode +*/ + +/** +* Takes an UTF-8 string and returns an array of ints representing the +* Unicode characters. Astral planes are supported ie. the ints in the +* output can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates +* are not allowed. +* Returns false if the input string isn't a valid UTF-8 octet sequence +* and raises a PHP error at level E_USER_WARNING +* Note: this function has been modified slightly in this library to +* trigger errors on encountering bad bytes +* @author <hsivonen@iki.fi> +* @param string UTF-8 encoded string +* @return mixed array of unicode code points or FALSE if UTF-8 invalid +* @see utf8_from_unicode +* @see http://hsivonen.iki.fi/php-utf8/ +* @package utf8 +* @subpackage unicode +*/ +function utf8_to_unicode($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 + + $out = array(); + $len = strlen($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. + $out[] = $in; + $mBytes = 1; + } + else if (0xC0 == (0xE0 & ($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; + $mBytes = 6; + } + else + { + // Current octet is neither in the US-ASCII range nor a legal first octet of a multi-octet sequence + trigger_error('utf8_to_unicode: Illegal sequence identifier in UTF-8 at byte '.$i, E_USER_WARNING); + 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 + ($mUcs4 > 0x10FFFF)) + { + trigger_error('utf8_to_unicode: Illegal sequence or codepoint in UTF-8 at byte '.$i, E_USER_WARNING); + return false; + } + + // BOM is legal but we don't want to output it + if (0xFEFF != $mUcs4) + $out[] = $mUcs4; + + // Initialize UTF8 cache + $mState = 0; + $mUcs4 = 0; + $mBytes = 1; + } + + } + else + { + /* ((0xC0 & (*in) != 0x80) && (mState != 0)) + Incomplete multi-octet sequence. */ + trigger_error('utf8_to_unicode: Incomplete multi-octet sequence in UTF-8 at byte '.$i, E_USER_WARNING); + return false; + } + } + } + + return $out; +} + +/** +* Takes an array of ints representing the Unicode characters and returns +* a UTF-8 string. Astral planes are supported ie. the ints in the +* input can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates +* are not allowed. +* Returns false if the input array contains ints that represent +* surrogates or are outside the Unicode range +* and raises a PHP error at level E_USER_WARNING +* Note: this function has been modified slightly in this library to use +* output buffering to concatenate the UTF-8 string (faster) as well as +* reference the array by it's keys +* @param array of unicode code points representing a string +* @return mixed UTF-8 string or FALSE if array contains invalid code points +* @author <hsivonen@iki.fi> +* @see utf8_to_unicode +* @see http://hsivonen.iki.fi/php-utf8/ +* @package utf8 +* @subpackage unicode +*/ +function utf8_from_unicode($arr) +{ + ob_start(); + + foreach (array_keys($arr) as $k) + { + if ( ($arr[$k] >= 0) && ($arr[$k] <= 0x007f) ) // ASCII range (including control chars) + { + echo chr($arr[$k]); + } + else if ($arr[$k] <= 0x07ff) //2 byte sequence + { + echo chr(0xc0 | ($arr[$k] >> 6)); + echo chr(0x80 | ($arr[$k] & 0x003f)); + } + else if($arr[$k] == 0xFEFF) // Byte order mark (skip) + { + // Nop -- zap the BOM + } + else if ($arr[$k] >= 0xD800 && $arr[$k] <= 0xDFFF) // Test for illegal surrogates + { + // Found a surrogate + trigger_error('utf8_from_unicode: Illegal surrogate at index: '.$k.', value: '.$arr[$k], E_USER_WARNING); + + return false; + } + else if ($arr[$k] <= 0xffff) // 3 byte sequence + { + echo chr(0xe0 | ($arr[$k] >> 12)); + echo chr(0x80 | (($arr[$k] >> 6) & 0x003f)); + echo chr(0x80 | ($arr[$k] & 0x003f)); + } + else if ($arr[$k] <= 0x10ffff) // 4 byte sequence + { + echo chr(0xf0 | ($arr[$k] >> 18)); + echo chr(0x80 | (($arr[$k] >> 12) & 0x3f)); + echo chr(0x80 | (($arr[$k] >> 6) & 0x3f)); + echo chr(0x80 | ($arr[$k] & 0x3f)); + } + else + { + trigger_error('utf8_from_unicode: Codepoint out of Unicode range at index: '.$k.', value: '.$arr[$k], E_USER_WARNING); + + // Out of range + return false; + } + } + + $result = ob_get_contents(); + ob_end_clean(); + + return $result; +} |