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using System;
using System.IO;
using System.Text;
namespace StringBuilderStream
{
public class StringBuilderStream : Stream
{
public StringBuilder stringBuilder { get; private set; }
public Encoding Encoding { get; private set; }
public StringBuilderStream(Encoding encoding, StringBuilder stringBuilder)
{
this.stringBuilder = stringBuilder;
this.Encoding = encoding;
}
public StringBuilderStream(Encoding encoding)
:this(encoding, new StringBuilder())
{
}
public StringBuilderStream()
: this(Encoding.Default)
{
}
public override string ToString()
{
return stringBuilder.ToString();
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return true; }
}
public override bool CanWrite
{
get { return true; }
}
public override void Flush()
{
}
public override long Length
{
get { return stringBuilder.Length; }
}
public override long Position { get; set; }
public override int Read(byte[] buffer, int offset, int count)
{
int remainingLength = stringBuilder.Length - (int)Position;
int actualCount = count < remainingLength ? count : remainingLength;
var chars = new char[actualCount];
stringBuilder.CopyTo((int)Position, chars, 0, actualCount);
var bytes = Encoding.GetBytes(chars);
bytes.CopyTo(buffer, offset);
return actualCount;
}
public override long Seek(long offset, SeekOrigin origin)
{
if (origin == SeekOrigin.Begin)
{
Position = offset;
}
else if (origin == SeekOrigin.Current)
{
Position += offset;
}
else if (origin == SeekOrigin.End)
{
Position = stringBuilder.Length - Position;
}
return Position;
}
public override void SetLength(long value)
{
if (stringBuilder.Length > value)
{
stringBuilder.Length = (int)value;
}
}
public override void Write(byte[] buffer, int offset, int count)
{
if (stringBuilder.Length > Position)
{
stringBuilder.Length = (int)Position;
}
stringBuilder.Append(Encoding.GetString(buffer, offset, count));
Position = stringBuilder.ToString().Length;
}
//You don't need to override BeginWrite/EndWrite, etc., unless you can call subsequent async methods:
//http://blogs.msdn.com/b/pfxteam/archive/2012/04/06/10291582.aspx
}
}
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