BaseEntity.cs :  » Bloggers » dasBlog » Lesnikowski » Pawel » Mail » Pop3 » C# / CSharp Open Source

using System;
using System.Collections;

namespace Lesnikowski.Pawel.Mail.Pop3{
  public class BaseEntity
  {
    protected string header; //all header 
    public string contentType;
    public string contentTransferEncoding;
    public string charset;
        public string boundary;
        public bool hasAttachments=false;
        public ArrayList attachments=new ArrayList();

    public BaseEntity(string buffer)
    {
      GetHeader(buffer);
            this.contentType      =this.GetValueFromHeader("Content-Type: ");
            //Try again? Not per spec...
            if (this.contentType == null || this.contentType.Length == 0)
            {
                this.contentType = this.GetValueFromHeader("Content-type: ");
            }
            this.contentTransferEncoding=this.GetValueFromHeader("Content-Transfer-Encoding: ");

      if (contentType.IndexOf("text/plain")!=-1 || contentType.IndexOf("text/html")!=-1)
        this.charset=GetValueEqualFromHeader2("charset=");
    }

        internal bool ParseMixedMessage(string buffer, string boundary)
        {
            int start=0,end;
        
            for(;;)
            {
                start=buffer.IndexOf(boundary,start);
        
                if (start==-1)
                    break;
        
                end=buffer.IndexOf(boundary,start+1);

                if (end==-1)
                    break;

                // remove boundary from buffer
                start += boundary.Length;

                Attachment a=new Attachment( buffer.Substring(start,end-start-2) );

                this.attachments.Add(a);
            }
            return true;
        }

    protected void GetHeader(string buffer) 
    {
      int end=buffer.IndexOf("\r\n\r\n");

      if (end==-1)
        throw new Exception("can't get header");
      
      header=buffer.Substring(0, end);
      header+="\r\n\r\n";
    }

    protected string GetValueFromHeader(string key)
    {
      int start=header.ToLower().IndexOf(key.ToLower());
      if(start<0)
        return "";
      start=header.IndexOf(' ',start);
      if (start<0)
        return "";
      int end=header.IndexOf("\r\n",start);
      if (end<=0)
        return "";
      return QuotedCoding.Decode(header.Substring(start+1, end-start-1).Trim());
    }

    /// <summary>
    /// z 'ala="123"'
    /// </summary>
    /// <param name="key">ala=</param>
    /// <returns>123</returns>
    protected string GetValueEqualFromHeader(string key)
    {
      int start=header.IndexOf(key);
      if (start==-1)
        return "";
      start=header.IndexOf('"',start);
      int end=header.IndexOf('"',start+1);
      if (start==-1 || end==-1)
        return "";
      return QuotedCoding.Decode(header.Substring(start+1,end-start-1));
    }

    /// <summary>
    /// z 'ala="123"'
    /// </summary>
    /// <param name="key">ala=</param>
    /// <returns>123</returns>
    protected string GetValueEqualFromHeader2(string key)
    {
      bool noQuotes = false;
      int end = -1;
      int start = header.IndexOf(key);
      if (start == -1)
        return "";
      start = header.IndexOf('"', start);
      if (start == -1)
      {
        noQuotes = true;
        start = header.IndexOf('=', header.IndexOf(key));
      }
      if (noQuotes)
      {
        end = header.IndexOf("\r\n", start + 1);
      }
      else
      {
        end = header.IndexOf('"', start + 1);
      }
      if (start == -1 || end == -1)
        return "";
      return QuotedCoding.Decode(header.Substring(start + 1, end - start - 1));
    }

  }
}