<?php
if (!defined('DEDEINC')) exit('dedebiz');
/**
 * DedeBIZV6中用到的字符编码转换的小助手函数
 *
 * @version        $Id: charset.helper.php 1 2010-07-05 11:43:09Z tianya $
 * @package        DedeBIZ.Helpers
 * @copyright      Copyright (c) 2022, DedeBIZ.COM
 * @license        https://www.dedebiz.com/license
 * @link           https://www.dedebiz.com
 */


$UC2GBTABLE = $CODETABLE = $BIG5_DATA = $GB_DATA = '';
$GbkUniDic = null;

/**
 *  UTF-8 转GB编码
 *
 * @access    public
 * @param     string  $utfstr  需要转换的字符串
 * @return    string
 */
if (!function_exists('utf82gb')) {
    function utf82gb($utfstr)
    {
        if (function_exists('iconv')) {
            return iconv('utf-8', 'gbk//ignore', $utfstr);
        }
        global $UC2GBTABLE;
        $okstr = "";
        if (trim($utfstr) == "") {
            return $utfstr;
        }
        if (empty($UC2GBTABLE)) {
            $filename = DEDEINC."/data/gb2312-utf8.dat";
            $fp = fopen($filename, "r");
            while ($l = fgets($fp, 15)) {
                $UC2GBTABLE[hexdec(substr($l, 7, 6))] = hexdec(substr($l, 0, 6));
            }
            fclose($fp);
        }
        $okstr = "";
        $ulen = strlen($utfstr);
        for ($i = 0; $i < $ulen; $i++) {
            $c = $utfstr[$i];
            $cb = decbin(ord($utfstr[$i]));
            if (strlen($cb) == 8) {
                $csize = strpos(decbin(ord($cb)), "0");
                for ($j = 0; $j < $csize; $j++) {
                    $i++;
                    $c .= $utfstr[$i];
                }
                $c = utf82u($c);
                if (isset($UC2GBTABLE[$c])) {
                    $c = dechex($UC2GBTABLE[$c] + 0x8080);
                    $okstr .= chr(hexdec($c[0].$c[1])).chr(hexdec($c[2].$c[3]));
                } else {
                    $okstr .= "&#".$c.";";
                }
            } else {
                $okstr .= $c;
            }
        }
        $okstr = trim($okstr);
        return $okstr;
    }
}

/**
 *  GB转UTF-8编码
 *
 * @access    public
 * @param     string  $gbstr  gbk的字符串
 * @return    string
 */
if (!function_exists('gb2utf8')) {
    function gb2utf8($gbstr)
    {
        if (function_exists('iconv')) {
            return iconv('gbk', 'utf-8//ignore', $gbstr);
        }
        global $CODETABLE;
        if (trim($gbstr) == "") {
            return $gbstr;
        }
        if (empty($CODETABLE)) {
            $filename = DEDEINC."/data/gb2312-utf8.dat";
            $fp = fopen($filename, "r");
            while ($l = fgets($fp, 15)) {
                $CODETABLE[hexdec(substr($l, 0, 6))] = substr($l, 7, 6);
            }
            fclose($fp);
        }
        $ret = "";
        $utf8 = "";
        while ($gbstr != '') {
            if (ord(substr($gbstr, 0, 1)) > 0x80) {
                $thisW = substr($gbstr, 0, 2);
                $gbstr = substr($gbstr, 2, strlen($gbstr));
                $utf8 = "";
                @$utf8 = u2utf8(hexdec($CODETABLE[hexdec(bin2hex($thisW)) - 0x8080]));
                if ($utf8 != "") {
                    for ($i = 0; $i < strlen($utf8); $i += 3)
                        $ret .= chr(substr($utf8, $i, 3));
                }
            } else {
                $ret .= substr($gbstr, 0, 1);
                $gbstr = substr($gbstr, 1, strlen($gbstr));
            }
        }
        return $ret;
    }
}

/**
 *  Unicode转utf8
 *
 * @access    public
 * @param     string  $c  Unicode的字符串内容
 * @return    string
 */
if (!function_exists('u2utf8')) {
    function u2utf8($c)
    {
        for ($i = 0; $i < count($c); $i++) {
            $str = "";
        }
        if ($c < 0x80) {
            $str .= $c;
        } else if ($c < 0x800) {
            $str .= (0xC0 | $c >> 6);
            $str .= (0x80 | $c & 0x3F);
        } else if ($c < 0x10000) {
            $str .= (0xE0 | $c >> 12);
            $str .= (0x80 | $c >> 6 & 0x3F);
            $str .= (0x80 | $c & 0x3F);
        } else if ($c < 0x200000) {
            $str .= (0xF0 | $c >> 18);
            $str .= (0x80 | $c >> 12 & 0x3F);
            $str .= (0x80 | $c >> 6 & 0x3F);
            $str .= (0x80 | $c & 0x3F);
        }
        return $str;
    }
}

/**
 *  utf8转Unicode
 *
 * @access    public
 * @param     string  $c  UTF-8的字符串信息
 * @return    string
 */
if (!function_exists('utf82u')) {
    function utf82u($c)
    {
        switch (strlen($c)) {
            case 1:
                return ord($c);
            case 2:
                $n = (ord($c[0]) & 0x3f) << 6;
                $n += ord($c[1]) & 0x3f;
                return $n;
            case 3:
                $n = (ord($c[0]) & 0x1f) << 12;
                $n += (ord($c[1]) & 0x3f) << 6;
                $n += ord($c[2]) & 0x3f;
                return $n;
            case 4:
                $n = (ord($c[0]) & 0x0f) << 18;
                $n += (ord($c[1]) & 0x3f) << 12;
                $n += (ord($c[2]) & 0x3f) << 6;
                $n += ord($c[3]) & 0x3f;
                return $n;
        }
    }
}

/**
 *  Big5码转换成GB码
 *
 * @access    public
 * @param     string   $Text  字符串内容
 * @return    string
 */
if (!function_exists('big52gb')) {
    function big52gb($Text)
    {
        if (function_exists('iconv')) {
            return iconv('big5', 'gbk//ignore', $Text);
        }
        global $BIG5_DATA;
        if (empty($BIG5_DATA)) {
            $filename = DEDEINC."/data/big5-gb.dat";
            $fp = fopen($filename, "rb");
            $BIG5_DATA = fread($fp, filesize($filename));
            fclose($fp);
        }
        $max = strlen($Text) - 1;
        for ($i = 0; $i < $max; $i++) {
            $h = ord($Text[$i]);
            if ($h >= 0x80) {
                $l = ord($Text[$i + 1]);
                if ($h == 161 && $l == 64) {
                    $gbstr = "　";
                } else {
                    $p = ($h - 160) * 510 + ($l - 1) * 2;
                    $gbstr = $BIG5_DATA[$p].$BIG5_DATA[$p + 1];
                }
                $Text[$i] = $gbstr[0];
                $Text[$i + 1] = $gbstr[1];
                $i++;
            }
        }
        return $Text;
    }
}

/**
 *  GB码转换成Big5码
 *
 * @access    public
 * @param     string  $Text 字符串内容
 * @return    string
 */
if (!function_exists('gb2big5')) {
    function gb2big5($Text)
    {
        if (function_exists('iconv')) {
            return iconv('gbk', 'big5//ignore', $Text);
        }
        global $GB_DATA;
        if (empty($GB_DATA)) {
            $filename = DEDEINC."/data/gb-big5.dat";
            $fp = fopen($filename, "rb");
            $gb = fread($fp, filesize($filename));
            fclose($fp);
        }
        $max = strlen($Text) - 1;
        for ($i = 0; $i < $max; $i++) {
            $h = ord($Text[$i]);
            if ($h >= 0x80) {
                $l = ord($Text[$i + 1]);
                if ($h == 161 && $l == 64) {
                    $big = "　";
                } else {
                    $p = ($h - 160) * 510 + ($l - 1) * 2;
                    $big = $GB_DATA[$p].$GB_DATA[$p + 1];
                }
                $Text[$i] = $big[0];
                $Text[$i + 1] = $big[1];
                $i++;
            }
        }
        return $Text;
    }
}

/**
 *  unicode url编码转gbk编码函数
 *
 * @access    public
 * @param     string  $str  转换的内容
 * @return    string
 */
if (!function_exists('UnicodeUrl2Gbk')) {
    function UnicodeUrl2Gbk($str)
    {
        //载入对照词典
        if (!isset($GLOBALS['GbkUniDic'])) {
            $fp = fopen(DEDEINC.'/data/gbk-unicode.dat', 'rb');
            while (!feof($fp)) {
                $GLOBALS['GbkUniDic'][bin2hex(fread($fp, 2))] = fread($fp, 2);
            }
            fclose($fp);
        }

        //处理字符串
        $str = str_replace('$#$', '+', $str);
        $glen = strlen($str);
        $okstr = "";
        for ($i = 0; $i < $glen; $i++) {
            if ($glen - $i > 4) {
                if ($str[$i] == '%' && $str[$i + 1] == 'u') {
                    $uni = strtolower(substr($str, $i + 2, 4));
                    $i = $i + 5;
                    if (isset($GLOBALS['GbkUniDic'][$uni])) {
                        $okstr .= $GLOBALS['GbkUniDic'][$uni];
                    } else {
                        $okstr .= "&#".hexdec('0x'.$uni).";";
                    }
                } else {
                    $okstr .= $str[$i];
                }
            } else {
                $okstr .= $str[$i];
            }
        }
        return $okstr;
    }
}

/**
 *  自动转换字符集 支持数组转换
 *
 * @access    public
 * @param     string  $str  转换的内容
 * @return    string
 */
if (!function_exists('AutoCharset')) {
    function AutoCharset($fContents, $from = 'gbk', $to = 'utf-8')
    {
        $from   =  strtoupper($from) == 'UTF8' ? 'utf-8' : $from;
        $to       =  strtoupper($to) == 'UTF8' ? 'utf-8' : $to;
        if (strtoupper($from) === strtoupper($to) || empty($fContents) || (is_scalar($fContents) && !is_string($fContents))) {
            //如果编码相同或者非字符串标量则不转换
            return $fContents;
        }
        if (is_string($fContents)) {
            if (function_exists('mb_convert_encoding')) {
                return mb_convert_encoding($fContents, $to, $from);
            } elseif (function_exists('iconv')) {
                return iconv($from, $to, $fContents);
            } else {
                return $fContents;
            }
        } elseif (is_array($fContents)) {
            foreach ($fContents as $key => $val) {
                $_key =     AutoCharset($key, $from, $to);
                $fContents[$_key] = AutoCharset($val, $from, $to);
                if ($key != $_key)
                    unset($fContents[$key]);
            }
            return $fContents;
        } else {
            return $fContents;
        }
    }
}