Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / ContentType.cs / 2 / ContentType.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mime { using System; using System.Collections; using System.Collections.Specialized; using System.IO; using System.Text; using System.Globalization; using System.Net.Mail; ////// Typed Content-Type header /// /// We parse the type during construction and set. /// null and string.empty will throw for construction,set and mediatype/subtype /// constructors set isPersisted to false. isPersisted needs to be tracked seperately /// than isChanged because isChanged only determines if the cached value should be used. /// isPersisted tracks if the object has been persisted. However, obviously if isChanged is true /// the object isn't persisted. /// If any subcomponents are changed, isChanged is set to true and isPersisted is false /// ToString caches the value until a isChanged is true, then it recomputes the full value. /// public class ContentType { string mediaType; string subType; bool isChanged; string type; bool isPersisted; TrackingStringDictionary parameters; ////// Default content type - can be used if the Content-Type header /// is not defined in the message headers. /// internal readonly static string Default = "application/octet-stream"; public ContentType() : this(Default) { } ////// ctor. /// /// Unparsed value of the Content-Type header. public ContentType(string contentType) { if (contentType == null) { throw new ArgumentNullException("contentType"); } if (contentType == String.Empty) { throw new ArgumentException(SR.GetString(SR.net_emptystringcall,"contentType"), "contentType"); } isChanged = true; type = contentType; ParseValue(); } public string Boundary { get { return Parameters["boundary"]; } set { if (value == null || value == string.Empty) { Parameters.Remove("boundary"); } else{ Parameters["boundary"] = value; } } } public string CharSet { get { return Parameters["charset"]; } set { if (value == null || value == string.Empty) { Parameters.Remove("charset"); } else{ Parameters["charset"] = value; } } } ////// Gets the media type. /// public string MediaType { get { return mediaType + "/" + subType; } set { if (value == null) { throw new ArgumentNullException("value"); } if (value == string.Empty) { throw new ArgumentException(SR.GetString(SR.net_emptystringset), "value"); } int offset = 0; mediaType = MailBnfHelper.ReadToken(value, ref offset, null); if (mediaType.Length == 0 || offset >= value.Length || value[offset++] != '/') throw new FormatException(SR.GetString(SR.MediaTypeInvalid)); subType = MailBnfHelper.ReadToken(value, ref offset, null); if(subType.Length == 0 || offset < value.Length){ throw new FormatException(SR.GetString(SR.MediaTypeInvalid)); } isChanged = true; isPersisted = false; } } public string Name { get { string value = Parameters["name"]; Encoding nameEncoding = MimeBasePart.DecodeEncoding(value); if(nameEncoding != null) value = MimeBasePart.DecodeHeaderValue(value); return value; } set { if (value == null || value == string.Empty) { Parameters.Remove("name"); } else{ if (MimeBasePart.IsAscii(value, false)) { Parameters["name"] = value; } else { Encoding encoding = Encoding.GetEncoding(MimeBasePart.defaultCharSet); Parameters["name"] = MimeBasePart.EncodeHeaderValue(value, encoding, MimeBasePart.ShouldUseBase64Encoding(encoding)); } } } } public StringDictionary Parameters { get { if (parameters == null) { if (type == null) { parameters = new TrackingStringDictionary(); } } return parameters; } } internal void Set(string contentType, HeaderCollection headers) { type = contentType; ParseValue(); headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentType), ToString()); isPersisted = true; } internal void PersistIfNeeded(HeaderCollection headers, bool forcePersist) { if (IsChanged || !isPersisted || forcePersist) { headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentType), ToString()); isPersisted = true; } } internal bool IsChanged { get { return (isChanged || parameters != null && parameters.IsChanged); } } public override string ToString() { if (type == null || IsChanged) { StringBuilder builder = new StringBuilder(); builder.Append(mediaType); builder.Append('/'); builder.Append(subType); foreach (string key in Parameters.Keys) { builder.Append("; "); builder.Append(key); builder.Append('='); MailBnfHelper.GetTokenOrQuotedString(parameters[key], builder); } type = builder.ToString(); isChanged = false; parameters.IsChanged = false; isPersisted = false; } return type; } public override bool Equals(object rparam) { if (rparam == null) { return false; } return (String.Compare(ToString(), rparam.ToString(), StringComparison.OrdinalIgnoreCase ) == 0); } public override int GetHashCode(){ return ToString().GetHashCode(); } // Helper methods. void ParseValue() { int offset = 0; Exception exception = null; parameters = new TrackingStringDictionary(); try{ mediaType = MailBnfHelper.ReadToken(type, ref offset, null); if (mediaType == null || mediaType.Length == 0 || offset >= type.Length || type[offset++] != '/'){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); } if (exception == null) { subType = MailBnfHelper.ReadToken(type, ref offset, null); if (subType == null || subType.Length == 0){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); } } if (exception == null) { while (MailBnfHelper.SkipCFWS(type, ref offset)) { if (type[offset++] != ';'){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); break; } if (!MailBnfHelper.SkipCFWS(type, ref offset)) break; string paramAttribute = MailBnfHelper.ReadParameterAttribute(type, ref offset, null); if(paramAttribute == null || paramAttribute.Length == 0){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); break; } string paramValue; if ( offset >= type.Length || type[offset++] != '='){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); break; } if (!MailBnfHelper.SkipCFWS(type, ref offset)){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); break; } if (type[offset] == '"') paramValue = MailBnfHelper.ReadQuotedString(type, ref offset, null); else paramValue = MailBnfHelper.ReadToken(type, ref offset, null); if(paramValue == null){ exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); break; } parameters.Add(paramAttribute, paramValue); } } parameters.IsChanged = false; } catch(FormatException){ throw new FormatException(SR.GetString(SR.ContentTypeInvalid)); } if(exception != null){ throw new FormatException(SR.GetString(SR.ContentTypeInvalid)); } } } }
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