106 lines
3.5 KiB
C#
106 lines
3.5 KiB
C#
//
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// System.Web.Mail.Base64AttachmentEncoder.cs
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//
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// Author(s):
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// Per Arneng <pt99par@student.bth.se>
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//
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.Text;
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using System.Security.Cryptography;
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namespace System.Web.Mail {
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// a class that handles Base64 encoding for attachments
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internal class Base64AttachmentEncoder : IAttachmentEncoder {
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// reads bytes from a stream and writes the encoded
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// as base64 encoded characters. ( 60 chars on each row)
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public void EncodeStream( Stream ins , Stream outs ) {
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if( ( ins == null ) || ( outs == null ) )
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throw new ArgumentNullException( "The input and output streams may not " +
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"be null.");
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ICryptoTransform base64 = new ToBase64Transform();
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// the buffers
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byte[] plainText = new byte[ base64.InputBlockSize ];
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byte[] cipherText = new byte[ base64.OutputBlockSize ];
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int readLength = 0;
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int count = 0;
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byte[] newln = new byte[] { 13 , 10 }; //CR LF with mail
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// read through the stream until there
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// are no more bytes left
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while( true ) {
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// read some bytes
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readLength = ins.Read( plainText , 0 , plainText.Length );
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// break when there is no more data
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if( readLength < 1 ) break;
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// transfrom and write the blocks. If the block size
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// is less than the InputBlockSize then write the final block
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if( readLength == plainText.Length ) {
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base64.TransformBlock( plainText , 0 ,
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plainText.Length ,
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cipherText , 0 );
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// write the data
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outs.Write( cipherText , 0 , cipherText.Length );
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// do this to output lines that
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// are 60 chars long
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count += cipherText.Length;
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if( count == 60 ) {
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outs.Write( newln , 0 , newln.Length );
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count = 0;
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}
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} else {
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// convert the final blocks of bytes and write them
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cipherText = base64.TransformFinalBlock( plainText , 0 , readLength );
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outs.Write( cipherText , 0 , cipherText.Length );
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}
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}
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outs.Write( newln , 0 , newln.Length );
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}
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}
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}
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