context: //
  // System.Data.SqlTypes.SqlBytes
  //
  // Author:
  //   Tim Coleman <tim@timcoleman.com>
  //
  // Copyright (C) Tim Coleman, 2003
  //
  
  //
  // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  //
  // 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.
  //
  
  #if NET_2_0
  
  using System;
  using System.Globalization;
  using System.IO;
  using System.Xml;
  using System.Xml.Schema;
  using System.Xml.Serialization;
  using System.Runtime.Serialization;
  
  namespace System.Data.SqlTypes
  {
  	[SerializableAttribute]
  	[XmlSchemaProvider ("GetXsdType")]
  	public sealed class SqlBytes : INullable, IXmlSerializable, ISerializable
  	{
  		#region Fields
  
  		bool notNull;
  		byte [] buffer;
  		StorageState storage = StorageState.UnmanagedBuffer;
  		Stream stream = null;
  
  		#endregion
  
  		#region Constructors
  
  		public SqlBytes ()
  		{
  			buffer = null;
  			notNull = false;
  		}
  
  		public SqlBytes (byte[] buffer)
  		{
  			if (buffer == null) {
  				notNull = false;
  				buffer = null;
  			}
  			else {
  				notNull = true;
  				this.buffer = buffer;
  				storage = StorageState.Buffer;
  			}
  		}
  
  		public SqlBytes (SqlBinary value)
  		{
  			if (value.IsNull) {
  				notNull = false;
  				buffer = null;
  			}
  			else {
  				notNull = true;
  				buffer = value.Value;
  				storage = StorageState.Buffer;
  			}
  		}
  
  		public SqlBytes (Stream s)
  		{
  			if (s == null) {
  				notNull = false;
  				buffer = null;
  			} else {
  				notNull = true;
  				int len = (int) s.Length;
  				buffer = new byte [len];
  				s.Read (buffer, 0, len);
  				storage = StorageState.Stream;
  				stream = s;
  			}
  		}
  
  		#endregion
  
  		#region Properties
  
  		public byte [] Buffer {
  			get { return buffer; }
  		}
  
  		public bool IsNull {
  			get { return !notNull; }
  		}
  
  		public byte this [long offset] {
  			set {
  				if (notNull && offset >= 0 && offset < buffer.Length)
  					buffer [offset] = value;
  			}
  			get {
  				if (buffer == null)
  					throw new SqlNullValueException ("Data is Null");
  				if (offset < 0 || offset >= buffer.Length)
  					throw new ArgumentOutOfRangeException ("Parameter name: offset");
  				return buffer [offset];
  			}
  		}
  
  		public long Length {
  			get {
  				if (!notNull || buffer == null)
  					throw new SqlNullValueException ("Data is Null");
  				if (buffer.Length < 0)
  					return -1;
  				return buffer.Length;
  			}
  		}
  
  		public long MaxLength {
  			get {
  				if (!notNull || buffer == null || storage == StorageState.Stream)
  					return -1;
  				return buffer.Length;
  			}
  		}
  
  		public static SqlBytes Null {
  			get {
  				return new SqlBytes ();
  			}
  		}
  
  		public StorageState Storage {
  			get {
  				if (storage == StorageState.UnmanagedBuffer)
  					throw new SqlNullValueException ("Data is Null");
  				return storage;
  			}
  		}
  
  		public Stream Stream {
  			set {
  				stream = value;
  			}
  			get {
  				return stream;
  			}
  		}
  
  		public byte [] Value {
  			get {
  				if (buffer == null)
  					return buffer;
  				return (byte []) buffer.Clone ();
  			}
  		}
  
  		#endregion
  
  		#region Methods
  
  		public void SetLength (long value)
  		{
  			if (buffer == null)
  				throw new SqlTypeException ("There is no buffer. Read or write operation failed.");
  			if (value < 0 || value > buffer.Length)
  				throw new ArgumentOutOfRangeException ("Specified argument was out of the range of valid values.");
  			Array.Resize (ref buffer, (int) value);
  		}
  
  		public void SetNull ()
  		{
  			buffer = null;
  			notNull = false;
  		}
  
  		public static explicit operator SqlBytes (SqlBinary value)
  		{
  			if (value.IsNull)
  				return Null;
  			else
  				return new SqlBytes (value.Value);
  		}
  
  		public static explicit operator SqlBinary (SqlBytes value)
  		{
  			if (value.IsNull)
  				return SqlBinary.Null;
  			else
  				return new SqlBinary (value.Value);
  		}
  
  		public SqlBinary ToSqlBinary ()
  		{
  			return new SqlBinary (buffer);
  		}
  
  		public static XmlQualifiedName GetXsdType (XmlSchemaSet schemaSet)
  		{
  			XmlQualifiedName qualifiedName = new XmlQualifiedName ("base64Binary", "http://www.w3.org/2001/XMLSchema");
  			return qualifiedName;
  		}
  		
  		[MonoTODO]
  		XmlSchema IXmlSerializable.GetSchema ()
  		{
  			throw new NotImplementedException ();
  		}
  
  		[MonoTODO]
  		void IXmlSerializable.ReadXml (XmlReader r)
  		{
  			throw new NotImplementedException ();
  		}
  
  		[MonoTODO]
  		void IXmlSerializable.WriteXml (XmlWriter writer)
  		{
  			throw new NotImplementedException ();
  		}
  
  		[MonoTODO]
  		void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
  		{
  			throw new NotImplementedException ();
  		}
  
  		public long Read (long offset, byte [] buffer, int offsetInBuffer, int count)
  		{
  			if (buffer == null)
  				throw new ArgumentNullException ("buffer");
  
  			if (IsNull)
  				throw new SqlNullValueException ("There is no buffer. Read or write failed");
  			
  			if (count > MaxLength || count > buffer.Length || 
  			    count < 0 || ((offsetInBuffer + count) > buffer.Length))
  				throw new ArgumentOutOfRangeException ("count");
  			
  			if (offset < 0 || offset > MaxLength)
  				throw new ArgumentOutOfRangeException ("offset");
  			
  			if (offsetInBuffer < 0 || offsetInBuffer > buffer.Length)
  				throw new ArgumentOutOfRangeException ("offsetInBuffer");
  			
  			/* Final count of what will be copied */
  			long actualCount = count;
  			if (count + offset > Length )
  				actualCount = Length - offset;
  			
  			Array.Copy (this.buffer, offset, buffer, offsetInBuffer, actualCount);
  			
  			return actualCount;
  		}
  
  		public void Write (long offset, byte [] buffer, int offsetInBuffer, int count)
  		{
  			if (buffer == null)
  				throw new ArgumentNullException ("buffer");
  
  			if (IsNull)
  				throw new SqlTypeException ("There is no buffer. Read or write operation failed.");
  							
  			if (offset < 0) 
  				throw new ArgumentOutOfRangeException ("offset");
  			
  			if (offsetInBuffer < 0 || offsetInBuffer > buffer.Length 
  			    || offsetInBuffer > Length 
  			    || offsetInBuffer + count > Length
  			    || offsetInBuffer + count > buffer.Length)
  
gt: 				throw new ArgumentOutOfRangeException ("offsetInBuffer");