谁有Quoted-Printable算法的函数
我在收邮件的时候，附件名字是被Quoted-Printable过的
变成这种字符串了：=?iso-8859-1?q?=B6=AB=C0=BC=BF=C6=BC=BC=B7=A2=D5=B9=D3=D0=CF=DE=B9=AB=CB=BE_=C3=E6=CA=D4=CA=D4=CC=E2.doc?=
谁有这个算法的函数
public static string qp(string Raw)
问题点数：50、回复次数：7Top
1 楼dejollia（Jollia）回复于 2005-11-11 12:45:17 得分 15
Quoted-Printable简称QP， 一般用在Email系统中。它通常用于少量文本方式的8位字符的编码，这种编码的应该是很好辨认的，它有大量的"="。下面是它的一个例子：
QP的算法可以说是最简单的也可以说是编码效率很低的一种编码（它的编码率是1:3），它是专门为了处理8位字符制定的。
它的算法是：读一个字符，如果ASCII码大于127，即字符的第8位是1的话，进行编码，否则忽略（有时也对7位字符编码）。编码很简单，看下面的C语言描述即可,关于QP的详细说明和准确定义可以参阅RFC2045。
/* QP编码 */
void qp(unsigned char sour, unsigned char& first, unsigned char& second)
/*
sour:要编码的字符
first:编码后的第一个字符
second:编码后的第二个字符
first和second为返回值
*/
{
if(sour > 127)
{
first=sour >> 4;
second=sour & 15;
if(first > 9)
first += 55;
else
first += 48;
if(second > 9)
second += 55;
else
second += 48;
printf("%c%c%c", '=', first, second);
}
}
/*QP解码*/
void uqp(unsigned char& sour, unsigned char first, unsigned char second)
/*
sour:解码后的字符
first:QP码的第一个字符
second:QP码的第二个字符
sour为返回值
*/
{
if(first >= 65)
first -= 55;
else
first -= 48;
if(second >= 65)
second -= 55;
else
second -= 48;
sour = NULL;
sour = first<<4;
sour |= second;
}Top
2 楼nik_Amis（...）回复于 2005-11-11 13:38:25 得分 0
这个偶也搜到了，那位大虾翻译成C#?
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3 楼purpo（漂泊的云）回复于 2005-11-30 10:45:47 得分 0
东兰科技发展有限公司_面试试题.doc
Top
4 楼purpo（漂泊的云）回复于 2005-12-01 15:35:34 得分 0
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Security;
using System.Collections;
namespace WindowsApplication1
{
/// QuotedPrintable 的摘要说明。
/// Quoted-Printable也是MIME邮件中常用的编码方式之一。
/// 同Base64一样，它也将输入的字符串或数据编码成全是ASCII码的可打印字符串。
///Quoted-Printable编码的基本方法是：输入数据在33-60、62-126范围内的，直接输出；
///其它的需编码为“=”加两个字节的HEX码(大写)。
///为保证输出行不超过规定长度，可在行尾加“=\r\n”序列作为软回车。
public class QuotedPrintable
{
private QuotedPrintable()
{
}
public const int RFC_1521_MAX_CHARS_PER_LINE = 75;
public static string Encode(string toencode)
{
return Encode(toencode, RFC_1521_MAX_CHARS_PER_LINE);
}
public static string Encode(string toencode, int charsperline)
{
if (toencode == null)
throw new ArgumentNullException();
if (charsperline <= 0)
throw new ArgumentOutOfRangeException();
string line, encodedHtml = "";
StringReader sr = new StringReader(toencode);
try
{
while((line=sr.ReadLine())!=null)
encodedHtml += EncodeSmallLine(line);
return FormatEncodedString(encodedHtml, charsperline);
}
finally
{
sr.Close();
sr = null;
}
}
public static string EncodeFile(string filepath)
{
return EncodeFile(filepath, RFC_1521_MAX_CHARS_PER_LINE);
}
public static string EncodeFile(string filepath, int charsperline)
{
if (filepath == null)
throw new ArgumentNullException();
string encodedHtml = "", line;
FileInfo f = new FileInfo(filepath);
if (! f.Exists)
throw new FileNotFoundException();
StreamReader sr = f.OpenText();
try
{
while((line=sr.ReadLine())!=null)
encodedHtml += EncodeSmallLine(line);
return FormatEncodedString(encodedHtml, charsperline);
}
finally
{
sr.Close();
sr = null;
f = null;
}
}
public static string EncodeSmall(string s)
{
if (s == null)
throw new ArgumentNullException();
string result = "";
byte[] pByte = Encoding.Default.GetBytes(s);
for( int i = 0 ; i <= pByte.Length-1 ;i++)
{
if ( (pByte[i] >= 33 && pByte[i] <= 60 ) || ( pByte[i] >=62 && pByte[i] <=126 ))
{
result += (char)pByte[i] ;
}
else
{
result = result +"=" +pByte[i].ToString("X2");
}
}
return result ;
}
public static string EncodeSmallLine(string s)
{
if (s == null)
throw new ArgumentNullException();
return EncodeSmall(s + "\r\n");
}
public static string FormatEncodedString(string qpstr, int maxcharlen)
{
if (qpstr == null)
throw new ArgumentNullException();
string strout = "";
StringWriter qpsw = new StringWriter();
try
{
byte[] pByte = Encoding.Default.GetBytes(qpstr);
for(int i = 0 ;i <= pByte.Length - 1 ;i++)
{
strout += (char)pByte[i] ;
if ( i == maxcharlen )
{
qpsw.WriteLine("{0}=", strout);
qpsw.Flush();
i=0;
strout = "";
}
}
qpsw.WriteLine(strout);
qpsw.Flush();
return qpsw.ToString();
}
finally
{
qpsw.Close();
qpsw = null;
}
}
static string HexDecoder(string line)
{
string result = "";
string tempLine = "";
if ( line.EndsWith("=") )
{
tempLine = line.Substring(0,line.Length-1) ;
}
else
{
tempLine = line ;
}
char[] pChar = tempLine.ToCharArray();
ArrayList al = new ArrayList();
for(int i = 0;i<= pChar.Length-1;i++ )
{
if( pChar[i] == '=' )
{
al.Add(int.Parse(pChar[i+1].ToString()+pChar[i+2].ToString(),System.Globalization.NumberStyles.HexNumber));
i = i + 2;
}
else
{
al.Add((int)pChar[i]);
}
}
byte[] pByte = new byte[al.Count];
for( int i = 0;i <= pByte.Length-1;i++)
{
tempLine = al[i].ToString();
pByte[i] = byte.Parse(tempLine);
}
result = Encoding.Default.GetString(pByte);
return result;
}
public static string DecodeFile(string filepath)
{
if (filepath == null)
throw new ArgumentNullException();
string decodedHtml = "", line;
FileInfo f = new FileInfo(filepath);
if (! f.Exists)
throw new FileNotFoundException();
StreamReader sr = f.OpenText();
try
{
while((line=sr.ReadLine())!=null)
decodedHtml += Decode(line);
return decodedHtml;
}
finally
{
sr.Close();
sr = null;
f = null;
}
}
public static string Decode(string encoded)
{
if (encoded == null)
throw new ArgumentNullException();
string line;
StringWriter sw = new StringWriter();
StringReader sr = new StringReader(encoded);
try
{
while((line=sr.ReadLine())!=null)
{
if (line.EndsWith("="))
sw.Write(HexDecoder(line.Substring(0, line.Length-1)));
else
sw.WriteLine(HexDecoder(line));
sw.Flush();
}
return sw.ToString();
}
finally
{
sw.Close();
sr.Close();
sw = null;
sr = null;
}
}
}
}
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5 楼purpo（漂泊的云）回复于 2005-12-01 15:39:41 得分 0
注：最近做一个项目中要用到QP编码及解码，故特意写了一个算法，以上仅供参考，希望各位多交流交流，不足之处还请赐教。Top
6 楼s5689412（华君）回复于 2005-12-01 15:59:25 得分 5
也可以参考这里：
http://www.codeproject.com/dotnet/cpSphereEmailComponent.aspTop
7 楼sugarsupper（智慧之刃）回复于 2005-12-01 16:17:14 得分 30
我找到的一个,lz看看吧
public static string ConvertFromQPString(string quoted_printableString)
{
string InputString=quoted_printableString;
StringBuilder builder1 = new StringBuilder();
InputString = InputString.Replace("=\r\n", "");
for (int num1 = 0; num1 < InputString.Length; num1++)
{
if (InputString[num1] == '=')
{
try
{
if (HexToDec(InputString.Substring(num1 + 1, 2)) < 0x80)
{
if (HexToDec(InputString.Substring(num1 + 1, 2)) >= 0)
{
byte[] buffer1 = new byte[1] { (byte) HexToDec(InputString.Substring(num1 + 1, 2)) } ;
builder1.Append(Encoding.Default.GetString(buffer1));
num1 += 2;
}
}
else if (InputString[num1 + 1] != '=')
{
byte[] buffer2 = new byte[2] { (byte) HexToDec(InputString.Substring(num1 + 1, 2)), (byte) HexToDec(InputString.Substring(num1 + 4, 2)) } ;
builder1.Append(Encoding.Default.GetString(buffer2));
num1 += 5;
}
}
catch
{
builder1.Append(InputString.Substring(num1, 1));
}
}
else
{
builder1.Append(InputString.Substring(num1, 1));
}
}
return builder1.ToString();
}
private static int HexToDec(string hex)
{
int num1 = 0;
string text1 = "0123456789ABCDEF";
for (int num2 = 0; num2 < hex.Length; num2++)
{
if (text1.IndexOf(hex[num2]) == -1)
{
return -1;
}
num1 = (num1 * 0x10) + text1.IndexOf(hex[num2]);
}
return num1;
} //Top
