Fix #184 Fix Size calculations Fix Stream Size validations

.editorconfig

@@ -120,7 +120,7 @@ csharp_style_prefer_pattern_matching = true
 csharp_style_prefer_switch_expression = true
 
 # Null-checking preferences
-csharp_style_conditional_delegate_call = true
+csharp_style_conditional_delegate_call = true:suggestion
 
 # Modifier preferences
 csharp_prefer_static_anonymous_function = true
@@ -188,7 +188,7 @@ csharp_space_after_comma = true
 csharp_space_after_dot = false
 csharp_space_after_keywords_in_control_flow_statements = true
 csharp_space_after_semicolon_in_for_statement = true
-csharp_space_around_binary_operators = ignore
+csharp_space_around_binary_operators = before_and_after
 csharp_space_around_declaration_statements = false
 csharp_space_before_colon_in_inheritance_clause = true
 csharp_space_before_comma = false

sources/OpenMcdf/CompoundFile.cs

@@ -727,6 +727,8 @@ List<Sector> miniStream
  null,
  sourceStream);
 
+
+
  // Set updated/new sectors within the ministream
  // We are writing data in a NORMAL Sector chain.
  for (int i = 0; i < sectorChain.Count; i++)
@@ -743,9 +745,13 @@ List<Sector> miniStream
  s.Id = (int)(miniStreamView.Position - Sector.MINISECTOR_SIZE) / Sector.MINISECTOR_SIZE;
 
  RootStorage.DirEntry.Size = miniStreamView.Length;
+
+
  }
  }
 
+
+
  // Update miniFAT
  StreamRW miniFATStreamRW = new(miniFATView);
  for (int i = 0; i < sectorChain.Count - 1; i++)
@@ -754,12 +760,14 @@ List<Sector> miniStream
  int nextId = sectorChain[i + 1].Id;
  miniFATStreamRW.Seek(currentId * 4, SeekOrigin.Begin);
  miniFATStreamRW.Write(nextId);
+
  }
 
  // Write End of Chain in MiniFAT
  miniFATStreamRW.Seek(sectorChain[sectorChain.Count - 1].Id * SIZE_OF_SID, SeekOrigin.Begin);
  miniFATStreamRW.Write(Sector.ENDOFCHAIN);
 
+
  // Update sector chains
  AllocateSectorChain(miniStreamView.BaseSectorChain);
  AllocateSectorChain(miniFATView.BaseSectorChain);
@@ -1007,6 +1015,10 @@ private void AllocateFATSectorChain(List<Sector> sectorChain)
  /// <param name="FATsectorChain">A FAT sector chain</param>
  private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
  {
+ //Get initial DIFAT chain
+ List<Sector> difatSectors =
+ GetSectorChain(-1, SectorType.DIFAT);
+
  // Get initial sector's count
  header.FATSectorsNumber = FATsectorChain.Count;
 
@@ -1022,22 +1034,34 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
  }
 
  // Sector count...
- int nCurrentSectors = sectors.Count;
+ //int nCurrentSectors = sectors.Count;
 
  // Temp DIFAT count
- int nDIFATSectors = (int)header.DIFATSectorsNumber;
+ //int nDIFATSectors = (int)header.DIFATSectorsNumber;
+ int nDIFATSectors = 0;
 
  if (FATsectorChain.Count > HEADER_DIFAT_ENTRIES_COUNT)
  {
  nDIFATSectors = Ceiling((double)(FATsectorChain.Count - HEADER_DIFAT_ENTRIES_COUNT) / DIFAT_SECTOR_FAT_ENTRIES_COUNT);
  nDIFATSectors = LowSaturation(nDIFATSectors - (int)header.DIFATSectorsNumber); //required DIFAT
  }
 
+
+ for (int i = 0; i < (nDIFATSectors - difatSectors.Count); i++)
+ {
+ Sector s = new Sector(SectorSize, sourceStream);
+ sectors.Add(s);
+ s.Id = sectors.Count - 1;
+ s.Type = SectorType.DIFAT;
+ difatSectors.Add(s);
+ }
+
  // ...sum with new required DIFAT sectors count
- nCurrentSectors += nDIFATSectors;
+ //nCurrentSectors += nDIFATSectors;
+ //header.FATSectorsNumber += nDIFATSectors;
 
  // ReCheck FAT bias
- while (header.FATSectorsNumber * FAT_SECTOR_ENTRIES_COUNT < nCurrentSectors)
+ while (FATsectorChain.Count * FAT_SECTOR_ENTRIES_COUNT < sectors.Count)
  {
  Sector extraFATSector = new Sector(SectorSize, sourceStream);
  sectors.Add(extraFATSector);
@@ -1047,26 +1071,25 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
 
  FATsectorChain.Add(extraFATSector);
 
- header.FATSectorsNumber++;
- nCurrentSectors++;
+ //header.FATSectorsNumber++;
+ //nCurrentSectors++;
 
  //... so, adding a FAT sector may induce DIFAT sectors to increase by one
  // and consequently this may induce ANOTHER FAT sector (TO-THINK: May this condition occur ?)
- if (nDIFATSectors * DIFAT_SECTOR_FAT_ENTRIES_COUNT <
- (header.FATSectorsNumber > HEADER_DIFAT_ENTRIES_COUNT ?
- header.FATSectorsNumber - HEADER_DIFAT_ENTRIES_COUNT :
- 0))
+ if (difatSectors.Count * DIFAT_SECTOR_FAT_ENTRIES_COUNT < (FATsectorChain.Count - HEADER_DIFAT_ENTRIES_COUNT))
  {
- nDIFATSectors++;
- nCurrentSectors++;
+
+ Sector s = new Sector(SectorSize, sourceStream);
+ sectors.Add(s);
+ s.Type = SectorType.DIFAT;
+ s.Id = sectors.Count - 1;
+ difatSectors.Add(s);
+
  }
  }
 
- List<Sector> difatSectors =
- GetSectorChain(-1, SectorType.DIFAT);
-
  using StreamView difatStream
- = new StreamView(difatSectors, SectorSize, sourceStream);
+ = new StreamView(difatSectors, SectorSize, difatSectors.Count * SectorSize, null, sourceStream);
 
  StreamRW difatStreamRW = new(difatStream);
 
@@ -1101,7 +1124,7 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
  }
  }
 
- header.DIFATSectorsNumber = (uint)nDIFATSectors;
+ header.DIFATSectorsNumber = (uint)difatStream.BaseSectorChain.Count;
 
  // Chain first sector
  if (difatStream.BaseSectorChain != null && difatStream.BaseSectorChain.Count > 0)
@@ -1130,16 +1153,17 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
 
  // Mark DIFAT Sectors in FAT
  using StreamView fatSv =
- new StreamView(FATsectorChain, SectorSize, header.FATSectorsNumber * SectorSize, null, sourceStream);
+ new StreamView(FATsectorChain, SectorSize, FATsectorChain.Count * SectorSize, null, sourceStream);
 
  StreamRW streamRW = new(fatSv);
- for (int i = 0; i < header.DIFATSectorsNumber; i++)
+
+ for (int i = 0; i < difatStream.BaseSectorChain.Count; i++)
  {
  streamRW.Seek(difatStream.BaseSectorChain[i].Id * 4, SeekOrigin.Begin);
  streamRW.Write(Sector.DIFSECT);
  }
 
- for (int i = 0; i < header.FATSectorsNumber; i++)
+ for (int i = 0; i < fatSv.BaseSectorChain.Count; i++)
  {
  streamRW.Seek(fatSv.BaseSectorChain[i].Id * 4, SeekOrigin.Begin);
  streamRW.Write(Sector.FATSECT);
@@ -1148,7 +1172,8 @@ private void AllocateDIFATSectorChain(List<Sector> FATsectorChain)
  //fatSv.Seek(fatSv.BaseSectorChain[fatSv.BaseSectorChain.Count - 1].Id * 4, SeekOrigin.Begin);
  //fatSv.Write(BitConverter.GetBytes(Sector.ENDOFCHAIN), 0, 4);
 
- header.FATSectorsNumber = fatSv.BaseSectorChain.Count;
+ header.FATSectorsNumber = FATsectorChain.Count;
+ header.DIFATSectorsNumber = (uint)difatSectors.Count;
  }
 
  /// <summary>
@@ -1244,9 +1269,8 @@ List<Sector> result
  List<Sector> difatSectors = GetDifatSectorChain();
 
  int idx = 0;
-
-
  int nextSecID;
+
  // Read FAT entries from the header Fat entry array (max 109 entries)
  while (idx < header.FATSectorsNumber && idx < N_HEADER_FAT_ENTRY)
  {
@@ -1277,9 +1301,7 @@ List<Sector> result
  (
  difatSectors,
  SectorSize,
- header.FATSectorsNumber > N_HEADER_FAT_ENTRY ?
- (header.FATSectorsNumber - N_HEADER_FAT_ENTRY) * 4 :
- 0,
+ difatSectors.Count * SectorSize,
  null,
  sourceStream);
 
@@ -1340,6 +1362,7 @@ List<Sector> result
  using StreamView fatStream
  = new StreamView(fatSectors, SectorSize, fatSectors.Count * SectorSize, null, sourceStream);
  StreamRW fatStreamRW = new(fatStream);
+
  while (true)
  {
  if (nextSecID == Sector.ENDOFCHAIN) break;
@@ -1389,12 +1412,12 @@ List<Sector> result
  List<Sector> miniStream = GetNormalSectorChain(RootEntry.StartSect);
 
  using StreamView miniFATView
- = new StreamView(miniFAT, SectorSize, header.MiniFATSectorsNumber * Sector.MINISECTOR_SIZE, null, sourceStream);
+ = new StreamView(miniFAT, SectorSize, header.MiniFATSectorsNumber * SectorSize, null, sourceStream);
 
  using StreamView miniStreamView =
  new StreamView(miniStream, SectorSize, RootStorage.Size, null, sourceStream);
 
- using BinaryReader miniFATReader = new BinaryReader(miniFATView);
+ StreamRW miniFATReader = new StreamRW(miniFATView);
 
  int nextSecID = secID;
  HashSet<int> processedSectors = new HashSet<int>();
@@ -1834,7 +1857,7 @@ List<Sector> miniFAT
  = GetSectorChain(header.FirstMiniFATSectorID, SectorType.Normal);
 
  using StreamView miniFATView
- = new StreamView(miniFAT, SectorSize, header.MiniFATSectorsNumber * Sector.MINISECTOR_SIZE, null, sourceStream);
+ = new StreamView(miniFAT, SectorSize, header.MiniFATSectorsNumber * SectorSize, null, sourceStream);
 
  StreamRW miniFATStreamRW = new(miniFATView);
 

sources/OpenMcdf/StreamView.cs

@@ -94,6 +94,9 @@ public override int Read(byte[] buffer, int offset, int count)
  long intMax = Math.Min(int.MaxValue, length);
  count = Math.Min((int)intMax, count);
 
+ // Ensure read request greater then stream length, when position is not 0, return only the limited and correct number of bytes
+ count = (int)Math.Min(length - position, count); 
+
  if (BaseSectorChain != null && BaseSectorChain.Count > 0)
  {
  // First sector

sources/Test/OpenMcdf.Extensions.Test/OLEPropertiesExtensionsTest.cs

@@ -472,5 +472,27 @@ public void Test_Retain_Dictionary_Property_In_AppSpecific_Streams()
  CollectionAssert.AreEqual(expectedPropertyNames, co.PropertyNames);
  }
  }
+
+ [TestMethod]
+ public void Test_FIX_CRASH()
+ {
+ using CompoundFile cf = new(CFSVersion.Ver_4, CFSConfiguration.Default);
+
+ CFStream cfStream = cf.RootStorage.AddStream("MyStream");
+ using Stream stream = cfStream.AsIOStream();
+ const int BufferLength = 4096 * 21;
+ var buffer = Helpers.GetBuffer(BufferLength);
+ stream.Write(buffer, 0, buffer.Length);
+ stream.Position = 0;
+
+ Assert.AreEqual(BufferLength, cfStream.Size);
+
+ using MemoryStream memoryStream = new();
+ using BufferedStream bufferedStream = new(stream);
+ bufferedStream.CopyTo(memoryStream);
+
+ Assert.AreEqual(memoryStream.Length, cfStream.Size);
+
+ }
  }
 }

sources/Test/OpenMcdf.Test/CompoundFileTest.cs

@@ -1088,5 +1088,7 @@ public void Test_FIX_BUG_96_CompoundFile_SaveOverwrite()
 
  File.Delete(filename2);
  }
+
+
  }
 }