Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / MimeBasePart.cs / 2 / 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; } internal static string EncodeHeaderValue(string value, Encoding encoding, bool base64Encoding) { StringBuilder newString = new StringBuilder(); if (encoding == null && IsAscii(value,false)) { return value; } if (encoding == null) { encoding = Encoding.GetEncoding(MimeBasePart.defaultCharSet); } string encodingName = encoding.BodyName; if(encoding == Encoding.BigEndianUnicode){ encodingName = "utf-16be"; } newString.Append("=?"); newString.Append(encodingName); newString.Append("?"); newString.Append(base64Encoding ? "B" : "Q"); newString.Append("?"); byte[] buffer = encoding.GetBytes(value); if (base64Encoding) { Base64Stream s = new Base64Stream(-1); s.EncodeBytes(buffer, 0, buffer.Length, true); newString.Append(ASCIIEncoding.ASCII.GetString(s.WriteState.Buffer, 0, s.WriteState.Length)); } else { QuotedPrintableStream s = new QuotedPrintableStream(-1); s.EncodeBytes(buffer, 0, buffer.Length); newString.Append(ASCIIEncoding.ASCII.GetString(s.WriteState.Buffer, 0, s.WriteState.Length)); } newString.Append("?="); return newString.ToString(); } internal static string DecodeHeaderValue(string value) { if(value == null || value.Length == 0){ return String.Empty; } string[] subStrings = value.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; if (base64Encoding) { Base64Stream s = new Base64Stream(); newLength = s.DecodeBytes(buffer, 0, buffer.Length); } else { QuotedPrintableStream s = new QuotedPrintableStream(); newLength = s.DecodeBytes(buffer, 0, buffer.Length); } Encoding encoding = Encoding.GetEncoding(charSet); string 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; } /* // Consider removing. internal string ContentDescription { get { return Headers[MimePartHeaderNames.ContentDescription]; } set { if (value == null) throw new ArgumentNullException("value"); Headers[MimePartHeaderNames.ContentDescription] = value; } } */ 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) { } } } }
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