SevenBitStream.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / SevenBitStream.cs / 1305376 / SevenBitStream.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.Mime 
{ 
    using System;
    using System.IO; 
    using System.Text;

    /// 
    /// This stream validates outgoing bytes to be within the 
    /// acceptible range of 0 - 127.  Writes will throw if a
    /// value > 127 is found. 
    ///  
    internal class SevenBitStream : DelegatedStream, IEncodableStream
    { 
        /// 
        /// ctor.
        /// 
        /// Underlying stream 
        internal SevenBitStream(Stream stream) : base(stream)
        { 
        } 

        ///  
        /// Writes the specified content to the underlying stream
        /// 
        /// Buffer to write
        /// Offset within buffer to start writing 
        /// Count of bytes to write
        /// Callback to call when write completes 
        /// State to pass to callback 
        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
        { 
            if (buffer == null)
                throw new ArgumentNullException("buffer");

            if (offset < 0 || offset >= buffer.Length) 
                throw new ArgumentOutOfRangeException("offset");
 
            if (offset + count > buffer.Length) 
                throw new ArgumentOutOfRangeException("count");
 
            CheckBytes(buffer, offset, count);
            IAsyncResult result = base.BeginWrite(buffer, offset, count, callback, state);
            return result;
        } 

        ///  
        /// Writes the specified content to the underlying stream 
        /// 
        /// Buffer to write 
        /// Offset within buffer to start writing
        /// Count of bytes to write
        public override void Write(byte[] buffer, int offset, int count)
        { 
            if (buffer == null)
                throw new ArgumentNullException("buffer"); 
 
            if (offset < 0 || offset >= buffer.Length)
                throw new ArgumentOutOfRangeException("offset"); 

            if (offset + count > buffer.Length)
                throw new ArgumentOutOfRangeException("count");
 
            CheckBytes(buffer, offset, count);
            base.Write(buffer, offset, count); 
        } 

        // helper methods 

        /// 
        /// Checks the data in the buffer for bytes > 127.
        ///  
        /// Buffer containing data
        /// Offset within buffer to start checking 
        /// Count of bytes to check 
        void CheckBytes(byte[] buffer, int offset, int count)
        { 
            for (int i = count; i < offset + count; i++)
            {
                if (buffer[i] > 127)
                    throw new FormatException(SR.GetString(SR.Mail7BitStreamInvalidCharacter)); 
            }
        } 
 
        public int DecodeBytes(byte[] buffer, int offset, int count)
        { 
            throw new NotImplementedException();
        }

        //nothing to "encode" here so all we're actually doing is folding 
        public int EncodeBytes(byte[] buffer, int offset, int count)
        { 
            throw new NotImplementedException(); 
        }
 
        public Stream GetStream()
        {
            return this;
        } 

        public string GetEncodedString() 
        { 
            throw new NotImplementedException();
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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