System.Net.Cache.SingleItemRequestCache.FrozenCacheEntry.GetBytes C# (CSharp) Method

            static byte[] GetBytes(Stream stream)
            {
                byte[] bytes;
                bool   resize = false;
                if (stream.CanSeek)
                    bytes = new byte[stream.Length];
                else
                {
                    resize = true;
                    bytes = new byte[4096*2];
                }
                
                int offset = 0;
                while (true)
                {   int read = stream.Read(bytes, offset, bytes.Length-offset);
                    if (read == 0)
                        break;
                    if ((offset+=read) == bytes.Length && resize)
                    {
                        byte[] newBytes = new byte[bytes.Length+4096*2];
                        Buffer.BlockCopy(bytes, 0, newBytes, 0, offset);
                        bytes = newBytes;
                    }
                }
                if (resize)
                {
                    byte[] newBytes = new byte[offset];
                    Buffer.BlockCopy(bytes, 0, newBytes, 0, offset);
                    bytes = newBytes;
                }
                return bytes;
            }