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Read Stream to fill the byte array

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; namespace Lilium.IO {     public static class StreamExtensions     {         public static byte[] ReadStrict(this Stream stream, byte[] buffer)         {             if (stream == null) throw new ArgumentNullException("stream");             if (buffer == null) throw new ArgumentNullException("buffer");             var bytesLeft = buffer.Length;             var bufferOffset = 0;             while (true)             {                 var count = stream.Read(buffer, bufferOffset, bytesLeft);                 if (count == bytesLeft)                     return buffer;                 else                 {                     if (count == 0)                         throw new IOException(string.Format("Unexcepted end of stream. Excepted more {0} bytes.", bytesLeft));                     bytesLeft -= count;                 }             }          }     } }