diff options
Diffstat (limited to 'phpBB/includes/utf/utf_tools.php')
| -rw-r--r-- | phpBB/includes/utf/utf_tools.php | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/phpBB/includes/utf/utf_tools.php b/phpBB/includes/utf/utf_tools.php new file mode 100644 index 0000000000..b3c3c5ed5e --- /dev/null +++ b/phpBB/includes/utf/utf_tools.php @@ -0,0 +1,217 @@ +<?php +/** +* +* @package phpBB3 +* @version $Id$ +* @copyright (c) 2005 phpBB Group +* @license http://opensource.org/licenses/gpl-license.php GNU Public License +* +*/ + +/** +* UTF-8 tools +* +* Whenever possible, these functions will try to use PHP's built-in functions or +* extensions, otherwise they will default to custom routines. +* +* If we go with UTF-8 in 3.2, we will also need a Unicode-aware replacement +* to strtolower() +* +* @package phpBB3 +*/ + +/** +* Return the length (in characters) of a UTF-8 string +* +* @param string $text UTF-8 string +* @return integer Length (in chars) of given string +*/ +function utf8_strlen($text) +{ + if (function_exists('iconv_strlen')) + { + return iconv_strlen($text, 'utf-8'); + } + + if (function_exists('mb_strlen')) + { + return mb_strlen($text, 'utf-8'); + } + + return strlen(utf8_decode($text)); +} + +/** +* Recode a string to UTF-8 +* +* If the encoding is not supported, the string is returned as-is +* +* @param string $string Original string +* @param string $encoding Original encoding +* @return string The string, encoded in UTF-8 +*/ +function utf8_recode($string, $encoding) +{ + $encoding = strtolower($encoding); + + if ($encoding == 'utf-8' || !is_string($string) || !isset($string[0])) + { + return $string; + } + + /** + * PHP has a built-in function for encoding from iso-8859-1, let's use that + */ + if ($encoding == 'iso-8859-1') + { + return utf8_encode($string); + } + + /** + * First, try iconv() + */ + if (function_exists('iconv')) + { + $ret = @iconv($encoding, 'utf-8', $string); + + if (isset($ret[0])) + { + return $ret; + } + } + + /** + * Try the mb_string extension + */ + if (function_exists('mb_convert_encoding')) + { + $ret = @mb_convert_encoding($string, 'utf-8', $encoding); + + if (isset($ret[0])) + { + return $ret; + } + } + + /** + * Try the recode extension + */ + if (function_exists('recode_string')) + { + $ret = @recode_string($encoding . '..utf-8', $string); + + if (isset($ret[0])) + { + return $ret; + } + } + + /** + * If nothing works, check if we have a custom transcoder available + */ + if (!preg_match('#^[a-z0-9\\-]+$#', $encoding)) + { + /** + * Make sure the encoding name is alphanumeric, we don't want it + * to be abused into loading arbitrary files + */ + trigger_error('Unknown encoding: ' . $encoding); + } + + global $phpbb_root_path; + if (!file_exists($phpbb_root_path . 'includes/utf/data/')) + { + return $string; + } + + die('Finish me!! '.basename(__FILE__).' at line '.__LINE__); +} + +/** +* Replace all UTF-8 chars that are not in ASCII with their NCR +* +* @param string $text UTF-8 string in NFC +* @return string ASCII string using NCRs for non-ASCII chars +*/ +function utf8_encode_ncr($text) +{ + return preg_replace_callback('#[\\xC2-\\xF4][\\x80-\\xBF]+#', 'utf8_encode_ncr_callback', $text); +} + +/** +* Callback used in encode_ncr() +* +* Takes a UTF-8 char and replaces it with its NCR. Attention, $m is an array +* +* @param array $m 0-based numerically indexed array passed by preg_replace_callback() +* @return string A HTML NCR if the character is valid, or the original string otherwise +*/ +function utf8_encode_ncr_callback($m) +{ + switch (strlen($m[0])) + { + case 1: + return '&#' . ord($m[0]) . ';'; + + case 2: + return '&#' . (((ord($m[0][0]) & 0x1F) << 6) | (ord($m[0][1]) & 0x3F)) . ';'; + + case 3: + return '&#' . (((ord($m[0][0]) & 0x0F) << 12) | ((ord($m[0][1]) & 0x3F) << 6) | (ord($m[0][2]) & 0x3F)) . ';'; + + case 4: + return '&#' . (((ord($m[0][0]) & 0x07) << 18) | ((ord($m[0][1]) & 0x3F) << 12) | ((ord($m[0][2]) & 0x3F) << 6) | (ord($m[0][3]) & 0x3F)) . ';'; + + default: + return $m[0]; + } +} + +/** +* Convert Numeric Character References to UTF-8 chars +* +* Notes: +* - we do not convert NCRs recursively, if you pass &#38; it will return & +* - we DO NOT check for the existence of the Unicode characters, therefore an entity +* may be converted to an inexistent codepoint +* +* @param string $text String to convert, encoded in UTF-8 (no normal form required) +* @return string UTF-8 string where NCRs have been replaced with the actual chars +*/ +function utf8_decode_ncr($text) +{ + return preg_replace_callback('/&#([0-9]{1,6}|x[0-9A-F]{1,5});/i', 'utf8_decode_ncr_callback', $text); +} + +/** +* Callback used in decode_ncr() +* +* Takes a NCR (in decimal or hexadecimal) and returns a UTF-8 char. Attention, $m is an array. +* It will ignore most of invalid NCRs, but not all! +* +* @param array $m 0-based numerically indexed array passed by preg_replace_callback() +* @return string UTF-8 char +*/ +function utf8_decode_ncr_callback($m) +{ + $cp = (strncasecmp($m[1], 'x', 1)) ? $m[1] : hexdec(substr($m[1], 1)); + + if ($cp > 0xFFFF) + { + return chr(0xF0 | ($cp >> 18)) . chr(0x80 | (($cp >> 12) & 0x3F)) . chr(0x80 | (($cp >> 6) & 0x3F)) . chr(0x80 | ($cp & 0x3F)); + } + elseif ($cp > 0x7FF) + { + return chr(0xE0 | ($cp >> 12)) . chr(0x80 | (($cp >> 6) & 0x3F)) . chr(0x80 | ($cp & 0x3F)); + } + elseif ($cp > 0x7F) + { + return chr(0xC0 | ($cp >> 6)) . chr(0x80 | ($cp & 0x3F)); + } + else + { + return chr($cp); + } +} + +?>
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