IMAP 文件夹名称编码解码代码,C#代码库,德仔网

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【C#】 IMAP 文件夹名称编码解码

作者:Alice / 发布于2016/5/11/ 700

// 编码
public class ImapFolderEncoder {
    public static String encode(String folder) {
    String rtn = "", base64;
    int index = 0;
    Pattern regAsis = Pattern.compile("\\G(?:[\\x20-\\x25\\x27-\\x7e])+");
    Pattern reg26 = Pattern.compile("\\G&");
    Pattern regEncode = Pattern.compile("\\G(?:[^\\x20-\\x7e])+");
    Pattern regEq = Pattern.compile("=+$");
    Pattern regSlash = Pattern.compile("\\/");
    while (index < folder.length()) {
        Matcher m;
        m = regAsis.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        rtn = rtn + m.group();
        continue;
        }
        m = reg26.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        rtn = rtn + "&-";
        continue;
        }
        m = regEncode.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        base64 = SimpleUtil.encodeBase64Content(m.group(), "UTF-16BE");
        base64 = base64.replaceAll(regEq.pattern(), "");
        base64 = base64.replaceAll(regSlash.pattern(), ",");
        rtn = rtn + "&" + base64 + "-";
        continue;
        }
    }
    return rtn;
    }
    
}

// 解码
public class ImapFolderDecoder {
    public static String decode(String folder) {
    String rtn = "", base64;
    int index = 0;
    Pattern regAsis = Pattern.compile("\\G([^&]+)");
    Pattern reg26 = Pattern.compile("\\G\\&-");
    Pattern regDecode = Pattern.compile("\\G\\&([A-Za-z0-9+,]+)-?");
    Pattern regComma = Pattern.compile(",");
    while (index < folder.length()) {
        Matcher m;
        m = regAsis.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        rtn = rtn + m.group();
        continue;
        }
        m = reg26.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        rtn = rtn + "&";
        continue;
        }
        m = regDecode.matcher(folder);
        if (m.find(index)) {
        index = index + (m.end() - m.start());
        base64 = m.group().substring(1, m.group().length() - 1);
        base64 = base64.replaceAll(regComma.pattern(), "/");
        int mod = base64.length() % 4;
        int count = 4 - mod;
        while (count > 0) {
            base64 += "=";
            count--;
        }
        base64 = SimpleUtil.base64Decode(base64, "UTF-16BE");
        rtn = rtn + base64;
        continue;
        }
    }
    return rtn;
    }
}

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