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//
// System.Web.Mail.UUAttachmentEncoder.cs
//
// Author(s):
// Per Arneng <pt99par@student.bth.se>
//
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Text;
namespace System.Web.Mail {
// a class that handles UU encoding for attachments
internal class UUAttachmentEncoder : IAttachmentEncoder {
protected byte[] beginTag;
protected byte[] endTag;
protected byte[] endl;
public UUAttachmentEncoder( int mode , string fileName ) {
string endlstr = "\r\n";
beginTag =
Encoding.ASCII.GetBytes( "begin " + mode + " " + fileName + endlstr);
endTag =
Encoding.ASCII.GetBytes( "`" + endlstr + "end" + endlstr );
endl = Encoding.ASCII.GetBytes( endlstr );
}
// uu encodes a stream in to another stream
public void EncodeStream( Stream ins , Stream outs ) {
// write the start tag
outs.Write( beginTag , 0 , beginTag.Length );
// create the uu transfom and the buffers
ToUUEncodingTransform tr = new ToUUEncodingTransform();
byte[] input = new byte[ tr.InputBlockSize ];
byte[] output = new byte[ tr.OutputBlockSize ];
while( true ) {
// read from the stream until no more data is available
int check = ins.Read( input , 0 , input.Length );
if( check < 1 ) break;
// if the read length is not InputBlockSize
// write a the final block
if( check == tr.InputBlockSize ) {
tr.TransformBlock( input , 0 , check , output , 0 );
outs.Write( output , 0 , output.Length );
outs.Write( endl , 0 , endl.Length );
} else {
byte[] finalBlock = tr.TransformFinalBlock( input , 0 , check );
outs.Write( finalBlock , 0 , finalBlock.Length );
outs.Write( endl , 0 , endl.Length );
break;
}
}
// write the end tag.
outs.Write( endTag , 0 , endTag.Length );
}
}
}
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