Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / MimeBasePart.cs / 1305376 / MimeBasePart.cs
using System; using System.Collections.Specialized; using System.IO; using System.Text; using System.Net.Mail; namespace System.Net.Mime { internal class MimeBasePart { protected ContentType contentType; protected ContentDisposition contentDisposition; HeaderCollection headers; internal const string defaultCharSet = "utf-8";//"iso-8859-1"; internal MimeBasePart() { } internal static bool ShouldUseBase64Encoding(Encoding encoding){ if (encoding == Encoding.Unicode || encoding == Encoding.UTF8 || encoding == Encoding.UTF32 || encoding == Encoding.BigEndianUnicode) { return true; } return false; } //use when the length of the header is not known or if there is no header internal static string EncodeHeaderValue(string value, Encoding encoding, bool base64Encoding){ return MimeBasePart.EncodeHeaderValue(value, encoding, base64Encoding, 0); } //used when the length of the header name itself is known (i.e. Subject : ) internal static string EncodeHeaderValue(string value, Encoding encoding, bool base64Encoding, int headerLength) { StringBuilder newString = new StringBuilder(); //no need to encode if it's pure ascii if (IsAscii(value, false)) { return value; } if (encoding == null) { encoding = Encoding.GetEncoding(MimeBasePart.defaultCharSet); } EncodedStreamFactory factory = new EncodedStreamFactory(); IEncodableStream stream = factory.GetEncoderForHeader(encoding, base64Encoding, headerLength); byte[] buffer = encoding.GetBytes(value); stream.EncodeBytes(buffer, 0, buffer.Length); return stream.GetEncodedString(); } internal static string DecodeHeaderValue(string value) { if(value == null || value.Length == 0){ return String.Empty; } string newValue = String.Empty; //split strings, they may be folded. If they are, decode one at a time and append the results string[] substringsToDecode = value.Split(new char[] { '\r', '\n', ' ' }, StringSplitOptions.RemoveEmptyEntries); foreach (string foldedSubString in substringsToDecode) { //an encoded string has as specific format in that it must start and end with an //'=' char and contains five parts, separated by '?' chars. //the first and last part are therefore '=', the second part is the byte encoding (B or Q) //the third is the unicode encoding type, and the fourth is encoded message itself. '?' is not valid inside of //an encoded string other than as a separator for these five parts. //If this check fails, the string is either not encoded or cannot be decoded by this method string[] subStrings = foldedSubString.Split('?'); if ((subStrings.Length != 5 || subStrings[0] != "=" || subStrings[4] != "=")) { return value; } string charSet = subStrings[1]; bool base64Encoding = (subStrings[2] == "B"); byte[] buffer = ASCIIEncoding.ASCII.GetBytes(subStrings[3]); int newLength; EncodedStreamFactory encoderFactory = new EncodedStreamFactory(); IEncodableStream s = encoderFactory.GetEncoderForHeader(Encoding.GetEncoding(charSet), base64Encoding, 0); newLength = s.DecodeBytes(buffer, 0, buffer.Length); Encoding encoding = Encoding.GetEncoding(charSet); newValue += encoding.GetString(buffer, 0, newLength); } return newValue; } internal static Encoding DecodeEncoding(string value) { if(value == null || value.Length == 0){ return null; } string[] subStrings = value.Split('?'); if ((subStrings.Length != 5 || subStrings[0] != "=" || subStrings[4] != "=")) { return null; } string charSet = subStrings[1]; return Encoding.GetEncoding(charSet); } internal static bool IsAscii(string value, bool permitCROrLF) { if (value == null) throw new ArgumentNullException("value"); foreach (char c in value) { if ((int)c > 0x7f) { return false; } if (!permitCROrLF && (c=='\r' || c=='\n')) { return false; } } return true; } internal static bool IsAnsi(string value, bool permitCROrLF) { if (value == null) throw new ArgumentNullException("value"); foreach (char c in value) { if ((int)c > 0xff) { return false; } if (!permitCROrLF && (c=='\r' || c=='\n')) { return false; } } return true; } internal string ContentID { get { return Headers[MailHeaderInfo.GetString(MailHeaderID.ContentID)]; } set { if (string.IsNullOrEmpty(value)) { Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.ContentID)); } else { Headers[MailHeaderInfo.GetString(MailHeaderID.ContentID)] = value; } } } internal string ContentLocation { get { return Headers[MailHeaderInfo.GetString(MailHeaderID.ContentLocation)]; } set { if (string.IsNullOrEmpty(value)) { Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.ContentLocation)); } else { Headers[MailHeaderInfo.GetString(MailHeaderID.ContentLocation)] = value; } } } internal NameValueCollection Headers { get { //persist existing info before returning if (headers == null) headers = new HeaderCollection(); if (contentType == null){ contentType = new ContentType(); } contentType.PersistIfNeeded(headers,false); if (contentDisposition != null) contentDisposition.PersistIfNeeded(headers,false); return headers; } } internal ContentType ContentType{ get{ if (contentType == null){ contentType = new ContentType(); } return contentType; } set { if (value == null) throw new ArgumentNullException("value"); contentType = value; contentType.PersistIfNeeded((HeaderCollection)Headers,true); } } internal virtual void Send(BaseWriter writer) { throw new NotImplementedException(); } internal virtual IAsyncResult BeginSend(BaseWriter writer, AsyncCallback callback, object state) { throw new NotImplementedException(); } internal void EndSend(IAsyncResult asyncResult) { if (asyncResult == null) { throw new ArgumentNullException("asyncResult"); } LazyAsyncResult castedAsyncResult = asyncResult as MimePartAsyncResult; if (castedAsyncResult == null || castedAsyncResult.AsyncObject != this) { throw new ArgumentException(SR.GetString(SR.net_io_invalidasyncresult), "asyncResult"); } if (castedAsyncResult.EndCalled) { throw new InvalidOperationException(SR.GetString(SR.net_io_invalidendcall, "EndSend")); } castedAsyncResult.InternalWaitForCompletion(); castedAsyncResult.EndCalled = true; if (castedAsyncResult.Result is Exception) { throw (Exception)castedAsyncResult.Result; } } internal class MimePartAsyncResult: LazyAsyncResult { internal MimePartAsyncResult(MimeBasePart part, object state, AsyncCallback callback):base(part,state,callback) { } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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