dicomreader.cs

ecg tool kit for medical image retrieval system

/***************************************************************************
Copyright 2008, Thoraxcentrum, Erasmus MC, Rotterdam, The Netherlands

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Written by Maarten JB van Ettinger.

****************************************************************************/
using System;
using System.IO;
using ECGConversion.DICOM;

namespace ECGConversion
{
	/// <summary>
	/// UNIPROReader class. class to read UNIPRO format.
	/// </summary>
	public class DICOMReader : IECGReader
	{
		public DICOMReader()
		{}
		public override IECGFormat Read(string file, int offset, ECGConfig cfg)
		{
			LastError = 0;
			IECGFormat ret = null;
			if (file != null)
			{
				try
				{
					Stream input = new FileStream(file, FileMode.Open, FileAccess.Read);
					ret = Read(input, offset, cfg);
					input.Close();
				}
				catch
				{
					LastError = 1;
				}
			}
			return ret;
		}
		public override IECGFormat Read(Stream input, int offset, ECGConfig cfg)
		{
			LastError = 0;
			IECGFormat ret = null;
			if ((input != null)
			&&	(input.CanRead))
			{
				ret = new DICOMFormat();

				if (ret.Config != null)
				{
					ret.Config.Set(cfg);

					if (!ret.Config.ConfigurationWorks())
					{
						LastError = 3;

						return null;
					}
				}

				if (ret.CheckFormat(input, offset))
				{
					LastError = (ret.Read(input, offset) << 2);
				}

				if (!ret.Works())
				{
					LastError = 2;
					ret = null;
				}
			}
			else
			{
				LastError = 1;
			}
			return ret;
		}
		public override IECGFormat Read(byte[] buffer, int offset, ECGConfig cfg)
		{
			LastError = 0;
			IECGFormat ret = null;
			if (buffer != null)
			{
				ret = new DICOMFormat();

				if (ret.Config != null)
				{
					ret.Config.Set(cfg);

					if (!ret.Config.ConfigurationWorks())
					{
						LastError = 3;

						return null;
					}
				}

				if (ret.CheckFormat(buffer, offset))
				{
					LastError = (ret.Read(buffer, offset) << 2);
				}

				if (!ret.Works())
				{
					LastError = 2;
					ret = null;
				}
			}
			else
			{
				LastError = 1;
			}
			return ret;
		}
		public override string getErrorMessage()
		{
			string message = null;
			switch (LastError)
			{
				case 0:
					break;
				case 1:
					message = "No file found";
					break;
				case 2:
					message = "Not a DICOM ECG file";
					break;
				case 3:
					message = "Incorrect format configuration";
					break;
				default:
					message = "ECG file type specific error";
					break;
			}
			return message;
		}
	}
}