MailHeaderInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / MailHeaderInfo.cs / 1 / MailHeaderInfo.cs
                        

                        
                            using System; 
using System.Collections.Specialized;
using System.Net.Mail;
using System.Globalization;
using System.Collections.Generic; 

namespace System.Net.Mail { 
 
    // Enumeration of the well-known headers.
    // If you add to this enum you MUST also add the appropriate initializer in m_HeaderInfo below. 
    internal enum MailHeaderID {
        Bcc = 0,
        Cc,
        Comments, 
        ContentDescription,
        ContentDisposition, 
        ContentID, 
        ContentLocation,
        ContentTransferEncoding, 
        ContentType,
        Date,
        From,
        Importance, 
        InReplyTo,
        Keywords, 
        Max, 
        MessageID,
        MimeVersion, 
        Priority,
        References,
        ReplyTo,
        ResentBcc, 
        ResentCc,
        ResentDate, 
        ResentFrom, 
        ResentMessageID,
        ResentSender, 
        ResentTo,
        Sender,
        Subject,
        To, 
        XPriority,
        XReceiver, 
        XSender, 
        ZMaxEnumValue = XSender,  // Keep this to equal to the last "known" enum entry if you add to the end
        Unknown = -1 
    }

    internal static class MailHeaderInfo {
 
        // Structure that wraps information about a single mail header
        private struct HeaderInfo { 
            public readonly string NormalizedName; 
            public readonly bool IsSingleton;
            public readonly MailHeaderID ID; 
            public HeaderInfo(MailHeaderID id, string name, bool isSingleton) {
                ID = id;
                NormalizedName = name;
                IsSingleton = isSingleton; 
            }
        } 
 

 
        // Table of well-known mail headers.
        // Keep the initializers in sync with the enum above.
        private static readonly HeaderInfo[] m_HeaderInfo = {
            //             ID                                     NormalizedString             IsSingleton 
            new HeaderInfo(MailHeaderID.Bcc,                      "Bcc",                       true),
            new HeaderInfo(MailHeaderID.Cc,                       "Cc",                        true), 
            new HeaderInfo(MailHeaderID.Comments,                 "Comments",                  false), 
            new HeaderInfo(MailHeaderID.ContentDescription,       "Content-Description",       true),
            new HeaderInfo(MailHeaderID.ContentDisposition,       "Content-Disposition",       true), 
            new HeaderInfo(MailHeaderID.ContentID,                "Content-ID",                true),
            new HeaderInfo(MailHeaderID.ContentLocation,          "Content-Location",          true),
            new HeaderInfo(MailHeaderID.ContentTransferEncoding,  "Content-Transfer-Encoding", true),
            new HeaderInfo(MailHeaderID.ContentType,              "Content-Type",              true), 
            new HeaderInfo(MailHeaderID.Date,                     "Date",                      true),
            new HeaderInfo(MailHeaderID.From,                     "From",                      true), 
            new HeaderInfo(MailHeaderID.Importance,               "Importance",                true), 
            new HeaderInfo(MailHeaderID.InReplyTo,                "In-Reply-To",               true),
            new HeaderInfo(MailHeaderID.Keywords,                 "Keywords",                  false), 
            new HeaderInfo(MailHeaderID.Max,                      "Max",                       false),
            new HeaderInfo(MailHeaderID.MessageID,                "Message-ID",                true),
            new HeaderInfo(MailHeaderID.MimeVersion,              "MIME-Version",              true),
            new HeaderInfo(MailHeaderID.Priority,                 "Priority",                  true), 
            new HeaderInfo(MailHeaderID.References,               "References",                true),
            new HeaderInfo(MailHeaderID.ReplyTo,                  "Reply-To",                  true), 
            new HeaderInfo(MailHeaderID.ResentBcc,                "Resent-Bcc",                false), 
            new HeaderInfo(MailHeaderID.ResentCc,                 "Resent-Cc",                 false),
            new HeaderInfo(MailHeaderID.ResentDate,               "Resent-Date",               false), 
            new HeaderInfo(MailHeaderID.ResentFrom,               "Resent-From",               false),
            new HeaderInfo(MailHeaderID.ResentMessageID,          "Resent-Message-ID",         false),
            new HeaderInfo(MailHeaderID.ResentSender,             "Resent-Sender",             false),
            new HeaderInfo(MailHeaderID.ResentTo,                 "Resent-To",                 false), 
            new HeaderInfo(MailHeaderID.Sender,                   "Sender",                    true),
            new HeaderInfo(MailHeaderID.Subject,                  "Subject",                   true), 
            new HeaderInfo(MailHeaderID.To,                       "To",                        true), 
            new HeaderInfo(MailHeaderID.XPriority,                "X-Priority",                true),
            new HeaderInfo(MailHeaderID.XReceiver,                "X-Receiver",                false), 
            new HeaderInfo(MailHeaderID.XSender,                  "X-Sender",                  true)
        };

        private static readonly Dictionary m_HeaderDictionary; 

        static MailHeaderInfo() { 
 
#if DEBUG
            // Check that enum and header info array are in sync 
            for(int i = 0; i < m_HeaderInfo.Length; i++) {
                if((int)m_HeaderInfo[i].ID != i) {
                    throw new Exception("Header info data structures are not in sync");
                } 
            }
#endif 
 
            // Create dictionary for string-to-enum lookup.  Ordinal and IgnoreCase are intentional.
            m_HeaderDictionary = new Dictionary((int)MailHeaderID.ZMaxEnumValue + 1, StringComparer.OrdinalIgnoreCase); 
            for(int i = 0; i < m_HeaderInfo.Length; i++) {
                m_HeaderDictionary.Add(m_HeaderInfo[i].NormalizedName, i);
            }
        } 

        internal static string GetString(MailHeaderID id) { 
            switch(id) { 
                case MailHeaderID.Unknown:
                case MailHeaderID.ZMaxEnumValue+1: 
                    return null;
                default:
                    return m_HeaderInfo[(int)id].NormalizedName;
            } 
        }
 
        internal static MailHeaderID GetID(string name) { 
            int id;
            if(m_HeaderDictionary.TryGetValue(name, out id)) { 
                return (MailHeaderID)id;
            }
            return MailHeaderID.Unknown;
        } 

        internal static bool IsWellKnown(string name) { 
            int dummy; 
            return m_HeaderDictionary.TryGetValue(name, out dummy);
        } 

        internal static bool IsSingleton(string name) {
            int index;
            if(m_HeaderDictionary.TryGetValue(name, out index)) { 
                return m_HeaderInfo[index].IsSingleton;
            } 
            return false; 
        }
 
        internal static string NormalizeCase(string name) {
            int index;
            if(m_HeaderDictionary.TryGetValue(name, out index)) {
                return m_HeaderInfo[index].NormalizedName; 
            }
            return name; 
        } 

        internal static bool IsMatch(string name, MailHeaderID header) { 
            int index;
            if(m_HeaderDictionary.TryGetValue(name, out index) && (MailHeaderID)index == header) {
                return true;
            } 
            return false;
        } 
    } 
}

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