NPOI/test/NPOI.TestCases/POIFS/FileSystem/TestEmptyDocument.cs

/* ====================================================================
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   contributor license agreements.  See the NOTICE file distributed with
   this work for Additional information regarding copyright ownership.
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   (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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/* ================================================================
 * About NPOI
 * Author: Tony Qu 
 * Author's email: tonyqus (at) gmail.com 
 * Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
 * HomePage: http://www.codeplex.com/npoi
 * Contributors:
 * 
 * ==============================================================*/

using System;
using System.Collections;
using System.IO;

using NUnit.Framework;

using NPOI.POIFS.FileSystem;
using NPOI.Util;

using NPOI.POIFS.Storage;
using NPOI.POIFS.Properties;
using NPOI.POIFS.EventFileSystem;


namespace TestCases.POIFS.FileSystem
{
    [TestFixture]
    public class TestEmptyDocument
    {
        private static POILogger _logger = POILogFactory.GetLogger(typeof(TestEmptyDocument));

        private class AnonymousClass : POIFSWriterListener
        {
            public void ProcessPOIFSWriterEvent(POIFSWriterEvent ev)
            {
                TestEmptyDocument._logger.Log(POILogger.WARN, "Written");
                Console.WriteLine("Written");
            }
        }

        private class AnonymousClass1 :POIFSWriterListener
        {
            public void ProcessPOIFSWriterEvent(POIFSWriterEvent ev)
            {
                try
                {
                    ev.Stream.Write(0);
                    Console.WriteLine("Send an event");
                }
                catch (IOException exception)
                {
                    throw new Exception("Exception on write: " + exception.Message);
                }
            }
        }

        private class EmptyClass : POIFSWriterListener
        {
            public void ProcessPOIFSWriterEvent(POIFSWriterEvent ev)
            {
                try
                {
                    ;
                }
                catch (IOException exception)
                {
                    throw new Exception("Exception on write: " + exception.Message);
                }
            }
        }
       

        [Test]
        public void TestSingleEmptyDocument()
        {
            POIFSFileSystem fs = new POIFSFileSystem();
            DirectoryEntry dir = fs.Root;
            dir.CreateDocument("Foo", new MemoryStream(new byte[] { }));

            MemoryStream output = new MemoryStream();
            fs.WriteFileSystem(output);
            byte[] temp = output.ToArray();
            Assert.IsNotNull(new POIFSFileSystem(new MemoryStream(temp)));
        }

        [Test]
        public void TestSingleEmptyDocumentEvent()
        {
            POIFSFileSystem fs = new POIFSFileSystem();
            DirectoryEntry dir = fs.Root;
            dir.CreateDocument("Foo", 0, new AnonymousClass());

            MemoryStream output = new MemoryStream();
            fs.WriteFileSystem(output);
            Assert.IsNotNull(new POIFSFileSystem(new MemoryStream(output.ToArray())));
        }
        [Test]
        public void TestEmptyDocumentWithFriend()
        {
            POIFSFileSystem fs = new POIFSFileSystem();
            DirectoryEntry dir = fs.Root;
            dir.CreateDocument("Bar", new MemoryStream(new byte[]{0}));
            dir.CreateDocument("Foo", new MemoryStream(new byte[]{}));

            MemoryStream output = new MemoryStream();
            fs.WriteFileSystem(output);
            Assert.IsNotNull(new POIFSFileSystem(new MemoryStream(output.ToArray())));
        }

        [Test]
        public void TestEmptyDocumentEventWithFriend()
        {
            POIFSFileSystem fs = new POIFSFileSystem();
            DirectoryEntry dir = fs.Root;
            dir.CreateDocument("Bar", 1, new AnonymousClass1());
            dir.CreateDocument("Foo", 0, new EmptyClass());

            MemoryStream output = new MemoryStream();
            fs.WriteFileSystem(output);
            Assert.IsNotNull(new POIFSFileSystem(new MemoryStream(output.ToArray())));

        }
        [Test]
        public void TestEmptyDocumentBug11744()
        {
            byte[] TestData = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

            POIFSFileSystem fs = new POIFSFileSystem();
            fs.CreateDocument(new MemoryStream(new byte[0]), "Empty");
            fs.CreateDocument(new MemoryStream(TestData), "NotEmpty");
            MemoryStream output = new MemoryStream();
            fs.WriteFileSystem(output);

            // This line caused the error.
            fs = new POIFSFileSystem(new MemoryStream(output.ToArray()));

            DocumentEntry entry = (DocumentEntry)fs.Root.GetEntry("Empty");
            Assert.AreEqual(0, entry.Size, "Expected zero size");
            byte[] actualReadbackData;
            actualReadbackData = NPOI.Util.IOUtils.ToByteArray(new DocumentInputStream(entry));
            Assert.AreEqual(0, actualReadbackData.Length, "Expected zero read from stream");

            entry = (DocumentEntry)fs.Root.GetEntry("NotEmpty");
            actualReadbackData = NPOI.Util.IOUtils.ToByteArray(new DocumentInputStream(entry));
            Assert.AreEqual(TestData.Length, entry.Size, "Expected size was wrong");
            Assert.IsTrue(
                    Arrays.Equals(TestData,actualReadbackData), "Expected different data Read from stream");
        }
    }
}