/*
openDICOM.NET openDICOM# 0.1.1
openDICOM# provides a library for DICOM related development on Mono.
Copyright (C) 2006-2007 Albert Gnandt
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
$Id: OW.cs 48 2007-03-28 13:49:15Z agnandt $
*/
using System;
using openDicom.DataStructure;
using openDicom.Registry;
namespace openDicom.Encoding{
/// <summary>
/// This class represents the specific DICOM VR Other Word String (OW).
/// </summary>
public sealed class OtherWordString: ValueRepresentation
{
public OtherWordString(Tag tag): base("OW", tag) {}
public override string ToLongString()
{
return "Other Word String (OW)";
}
protected override Array DecodeImproper(byte[] bytes)
{
ushort[] wordValue = new ushort[(int) Math.Floor((double) bytes.Length / 2)];
byte[] buffer = new byte[2];
for (int i = 0; i < wordValue.Length; i++)
{
Array.Copy(bytes, i * 2, buffer, 0, 2);
wordValue[i] = BitConverter.ToUInt16(
TransferSyntax.CorrectByteOrdering(buffer), 0);
}
return new ushort[1][] { wordValue };
}
protected override Array DecodeProper(byte[] bytes)
{
ValueMultiplicity vm = Tag.GetDictionaryEntry().VM;
if (vm.Equals(1) || vm.IsUndefined)
{
if (bytes.Length % 2 != 0)
throw new EncodingException(
"A value of multiple 2 bytes is only allowed.", Tag,
Name + "/value.Length", bytes.Length.ToString());
// TODO: Get allowed length from transfer syntax.
ushort[] wordValue = new ushort[bytes.Length / 2];
byte[] buffer = new byte[2];
for (int i = 0; i < wordValue.Length; i++)
{
Array.Copy(bytes, i * 2, buffer, 0, 2);
wordValue[i] = BitConverter.ToUInt16(
TransferSyntax.CorrectByteOrdering(buffer), 0);
}
return new ushort[1][] { wordValue };
}
else
throw new EncodingException(
"Multiple values are not allowed within this field.", Tag,
Name + "/VM", vm.ToString());
}
}
}
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