QuotedPrintableEncoding.cs类源码-Mime命名空间-代码大全-开发者工具网

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你现在查看的是QuotedPrintableEncoding.cs类的源码

/// <summary>
/// 类说明：Assistant
/// 编 码 人：苏飞
/// 联系方式：361983679  
/// 更新网站：http://www.sufeinet.com/thread-655-1-1.html
/// </summary>
using System;
using System.IO;
using System.Text.RegularExpressions;

namespace DotNet.Utilities
{
    /// <summary>
    /// This class is based on the QuotedPrintable class written by Bill Gearhart
    /// </summary>
    public static class QuotedPrintableEncoding
    {
        private const string Equal = "=";

private const string HexPattern = "(\\=([0-9A-F][0-9A-F]))";

public static string Decode(string contents)
        {
            if (contents == null)
            {
                throw new ArgumentNullException("contents");
            }

using (StringWriter writer = new StringWriter())
            {
                using (StringReader reader = new StringReader(contents))
                {
                    string line;
                    while ((line = reader.ReadLine()) != null)
                    {
                        /*remove trailing line whitespace that may have
                         been added by a mail transfer agent per rule
                         #3 of the Quoted Printable section of RFC 1521.*/
                        line.TrimEnd();

if (line.EndsWith(Equal))
                        {
                            writer.Write(DecodeLine(line));
                        } //handle soft line breaks for lines that end with an "="
                        else
                        {
                            writer.WriteLine(DecodeLine(line));
                        }
                    }
                }
                writer.Flush();

return writer.ToString();
            }
        }

private static string DecodeLine(string line)
        {
            if (line == null)
            {
                throw new ArgumentNullException("line");
            }

Regex hexRegex = new Regex(HexPattern, RegexOptions.IgnoreCase);

return hexRegex.Replace(line, new MatchEvaluator(HexMatchEvaluator));
        }

private static string HexMatchEvaluator(Match m)
        {
            int dec = Convert.ToInt32(m.Groups[2].Value, 16);
            char character = Convert.ToChar(dec);
            return character.ToString();
        }
    }
}