context: //
  // System.IO.BinaryWriter
  //
  // Authors:
  //   Matt Kimball (matt@kimball.net)
  //   Marek Safar (marek.safar@gmail.com)
  //
  
  //
  // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  // Copyright 2011 Xamarin Inc.
  //
  // Permission is hereby granted, free of charge, to any person obtaining
  // a copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to
  // permit persons to whom the Software is furnished to do so, subject to
  // the following conditions:
  // 
  // The above copyright notice and this permission notice shall be
  // included in all copies or substantial portions of the Software.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  using System;
  using System.Text;
  using System.Globalization;
  using Mono.Security;
  using System.Runtime.InteropServices;
  
  namespace System.IO {
  	[Serializable]
  	[ComVisible (true)]
  	public class BinaryWriter : IDisposable {
  
  		// Null is a BinaryWriter with no backing store.
  		public static readonly BinaryWriter Null = new BinaryWriter ();
  
  		protected Stream OutStream;
  		private Encoding m_encoding;
  		private byte [] buffer;
  		byte [] stringBuffer;
  		int maxCharsPerRound;
  		bool disposed;
  
  		protected BinaryWriter() : this (Stream.Null, Encoding.UTF8UnmarkedUnsafe)
  		{
  		}
  
  		public BinaryWriter(Stream output) : this(output, Encoding.UTF8UnmarkedUnsafe)
  		{
  		}
  		
  #if NET_4_5
  		readonly bool leave_open;
  		
  		public BinaryWriter(Stream output, Encoding encoding)
  			: this (output, encoding, false)
  		{
  		}
  		
  		public BinaryWriter(Stream output, Encoding encoding, bool leaveOpen)
  #else
  		const bool leave_open = false;
  		
  		public BinaryWriter(Stream output, Encoding encoding)
  #endif
  		{
  			if (output == null) 
  				throw new ArgumentNullException("output");
  			if (encoding == null) 
  				throw new ArgumentNullException("encoding");
  			if (!output.CanWrite)
  				throw new ArgumentException(Locale.GetText ("Stream does not support writing or already closed."));
  
  #if NET_4_5
  			leave_open = leaveOpen;
  #endif
  			OutStream = output;
  			m_encoding = encoding;
  			buffer = new byte [16];
  		}
  
  		public virtual Stream BaseStream {
  			get {
  				Flush ();
  				return OutStream;
  			}
  		}
  
  		public virtual void Close() {
  			Dispose (true);
  		}
  
  #if NET_4_0
  		public void Dispose ()
  #else
  		void IDisposable.Dispose() 
  #endif
  		{
  			Dispose (true);
  		}
  
  		protected virtual void Dispose (bool disposing)
  		{
  			if (disposing && OutStream != null && !leave_open)
  				OutStream.Close();
  			
  			buffer = null;
  			m_encoding = null;
  			disposed = true;
  		}
  
  		public virtual void Flush() {
  			OutStream.Flush();
  		}
  
  		public virtual long Seek(int offset, SeekOrigin origin) {
  
  			return OutStream.Seek(offset, origin);
  		}
  
  		public virtual void Write(bool value) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			buffer [0] = (byte) (value ? 1 : 0);
  			OutStream.Write(buffer, 0, 1);
  		}
  
  		public virtual void Write(byte value) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			OutStream.WriteByte(value);
  		}
  
  		public virtual void Write(byte[] buffer) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			if (buffer == null)
  				throw new ArgumentNullException("buffer");
  			OutStream.Write(buffer, 0, buffer.Length);
  		}
  
  		public virtual void Write(byte[] buffer, int index, int count) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			if (buffer == null)
  				throw new ArgumentNullException("buffer");
  			OutStream.Write(buffer, index, count);
  		}
  
  		public virtual void Write(char ch) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			char[] dec = new char[1];
  			dec[0] = ch;
  			byte[] enc = m_encoding.GetBytes(dec, 0, 1);
  			OutStream.Write(enc, 0, enc.Length);
  		}
  		
  		public virtual void Write(char[] chars) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			if (chars == null)
  				throw new ArgumentNullException("chars");
  			byte[] enc = m_encoding.GetBytes(chars, 0, chars.Length);
  			OutStream.Write(enc, 0, enc.Length);
  		}
  
  		public virtual void Write(char[] chars, int index, int count) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			if (chars == null)
  				throw new ArgumentNullException("chars");
  			byte[] enc = m_encoding.GetBytes(chars, index, count);
  			OutStream.Write(enc, 0, enc.Length);
  		}
  
  		unsafe public virtual void Write(decimal value) {
  
  			if (disposed)
  				throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  
  			byte* value_ptr = (byte *)&value;
  			
  			/*
  			 * decimal in stream is lo32, mi32, hi32, ss32
  			 * but its internal structure si ss32, hi32, lo32, mi32
  			 */
  				 
  			if (BitConverter.IsLittleEndian) {
  				for (int i = 0; i < 16; i++) {
  					if (i < 4) 
  						buffer [i + 12] = value_ptr [i];
  					else if (i < 8)
  						buffer [i + 4] = value_ptr [i];
  					else if (i < 12)
  
gt: 						buffer [i - 8] = value_ptr [i];