Fix #256 - wrong limit calculation for DIFAT sectors - added unit test

Author: ironfede

sources/OpenMcdf/CompoundFile.cs

@@ -1042,8 +1042,9 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
                 nDIFATSectors = LowSaturation(nDIFATSectors - (int)header.DIFATSectorsNumber); //required DIFAT
             }
 
-
-            for (int i = 0; i < (nDIFATSectors - difatSectors.Count); i++)
+            //for (int i = 0; i < (nDIFATSectors - difatSectors.Count); i++)
+            
+            for (int i = 0; i < nDIFATSectors; i++)
             {
                 Sector s = new Sector(SectorSize, sourceStream);
                 sectors.Add(s);

sources/OpenMcdf/OpenMcdf.csproj

@@ -68,7 +68,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>2.2.1.9</ApplicationVersion>
+    <ApplicationVersion>2.4.1.0</ApplicationVersion>
     <IsWebBootstrapper>true</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
@@ -78,7 +78,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>2.4.0.0</Version>
+    <Version>2.4.1.0</Version>
     <Authors>ironfede</Authors>
     <PackageProjectUrl>https://github.com/ironfede/openmcdf</PackageProjectUrl>
     <PackageIconUrl></PackageIconUrl>

sources/OpenMcdf/Properties/AssemblyInfo.cs

@@ -8,7 +8,7 @@
 [assembly: AssemblyDescription("OpenMcdf is a 100% .net / C# component that allows developers to manipulate Microsoft Compound Document File Format for OLE structured storage. It supports read/write operations on streams and storages and traversal of structures tree.")]
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("Federico Blaseotto")]
-[assembly: AssemblyProduct("OpenMcdf 2.3")]
+[assembly: AssemblyProduct("OpenMcdf 2.4")]
 [assembly: AssemblyCopyright("Copyright © 2010-2024, Federico Blaseotto")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
@@ -31,7 +31,7 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.4.0.0")]
+[assembly: AssemblyVersion("2.4.1.0")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("OpenMcdf.Tests,PublicKey=002400000480000094000000060200000024000052534131000400000100010085b50cbc1e40df696f8c30eaafc59a01e22303cb038fc832289b2c393f908a65c9aaa0d28026a47c6e5f85cc236f0735bea17236dbaaf91fea0003ddc1bb9c4cd318c5b855e7ef5877df5a7fc8394ee747d3573b69622e045837d546befb2fc13257e984db53a73dd59254a9a1d3c99a8ca6876c91304ea96899ac06a88d7bc6")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("OpenMcdf.Test,PublicKey=002400000480000094000000060200000024000052534131000400000100010085b50cbc1e40df696f8c30eaafc59a01e22303cb038fc832289b2c393f908a65c9aaa0d28026a47c6e5f85cc236f0735bea17236dbaaf91fea0003ddc1bb9c4cd318c5b855e7ef5877df5a7fc8394ee747d3573b69622e045837d546befb2fc13257e984db53a73dd59254a9a1d3c99a8ca6876c91304ea96899ac06a88d7bc6")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("OpenMcdf.Extensions,PublicKey=002400000480000094000000060200000024000052534131000400000100010085b50cbc1e40df696f8c30eaafc59a01e22303cb038fc832289b2c393f908a65c9aaa0d28026a47c6e5f85cc236f0735bea17236dbaaf91fea0003ddc1bb9c4cd318c5b855e7ef5877df5a7fc8394ee747d3573b69622e045837d546befb2fc13257e984db53a73dd59254a9a1d3c99a8ca6876c91304ea96899ac06a88d7bc6")]

sources/Test/OpenMcdf.Test/CFStreamTest.cs

@@ -1047,5 +1047,38 @@ public void TEST_RESIZE_STREAM_BUG_119()
                 cf.Commit();
             }
         }
+
+        /// <summary>
+        /// Resize without transition to smaller chain has a wrong behavior
+        /// </summary>
+        [TestMethod]
+        public void TEST_ADD_STREAM_BUG_256()
+        {
+            string tempFile = @"OpenMCDFCrash.dat";
+
+            // create big MCDF file
+            CFSVersion version = CFSVersion.Ver_3;
+            CFSConfiguration configuration = CFSConfiguration.Default;
+            CFSUpdateMode updateMode = CFSUpdateMode.Update;
+
+            using (CompoundFile compoundFile = new CompoundFile(version, configuration))
+            {
+                compoundFile.SaveAs(tempFile);
+                compoundFile.Close();
+            }
+
+            using (var compoundFile = new CompoundFile(tempFile, updateMode, configuration))
+            {
+                byte[] data = new byte[6617123];
+
+                for (int i = 0; i < 100; i++)
+                {
+                    var cfStream = compoundFile.RootStorage.AddStream($"Stream {i}.dat");
+                    cfStream.SetData(data);
+                }
+
+                compoundFile.Commit();
+            }
+        }
     }
 }