private void WriteArchive()
{
if (this.Mode == ZipArchiveMode.Update)
{
foreach (ZipArchiveEntry zipArchiveEntry in this.entries.Values)
{
zipArchiveEntry.Dispose();
}
}
long position1 = this.Writer.BaseStream.Position;
foreach (ZipArchiveEntry zipArchiveEntry in this.entries.Values)
{
zipArchiveEntry.WriteCentralDirectoryHeader();
}
long num = this.Writer.BaseStream.Position - position1;
bool flag = false;
if (position1 >= (long)uint.MaxValue || num >= (long)uint.MaxValue || this.entries.Count >= (int)ushort.MaxValue)
{
flag = true;
}
if (flag)
{
long position2 = this.Writer.BaseStream.Position;
if (this.zip64EndOfCentralDirectoryRecord == null)
{
this.zip64EndOfCentralDirectoryRecord = new Zip64EndOfCentralDirectoryRecord();
}
this.zip64EndOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory = (ulong)this.entries.Count;
this.zip64EndOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectoryOnThisDisk = (ulong)this.entries.Count;
this.zip64EndOfCentralDirectoryRecord.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = (ulong)position1;
this.zip64EndOfCentralDirectoryRecord.SizeOfCentralDirectory = (ulong)num;
this.zip64EndOfCentralDirectoryRecord.WriteBlock(this.Writer);
if (this.zip64EndOfCentralDirectoryLocator == null)
{
this.zip64EndOfCentralDirectoryLocator = new Zip64EndOfCentralDirectoryLocator();
}
this.zip64EndOfCentralDirectoryLocator.NumberOfTheDiskWithTheStartOfTheZip64EndOfCentralDirectory = 0U;
this.zip64EndOfCentralDirectoryLocator.NumberOfDisks = 1U;
this.zip64EndOfCentralDirectoryLocator.RelativeOffsetOfTheZip64EndOfCentralDirectoryRecord = (ulong)position2;
this.zip64EndOfCentralDirectoryLocator.WriteBlock(this.Writer);
}
if (this.endOfCentralDirectoryRecord == null)
{
this.endOfCentralDirectoryRecord = new EndOfCentralDirectoryRecord();
}
this.endOfCentralDirectoryRecord.NumberOfThisDisk = (ushort)0;
this.endOfCentralDirectoryRecord.NumberOfTheDiskWithTheStartOfTheCentralDirectory = (ushort)0;
this.endOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectoryOnThisDisk = this.entries.Count < (int)ushort.MaxValue ? (ushort)this.entries.Count : ushort.MaxValue;
this.endOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory = this.entries.Count < (int)ushort.MaxValue ? (ushort)this.entries.Count : ushort.MaxValue;
this.endOfCentralDirectoryRecord.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = position1 > (long)uint.MaxValue ? uint.MaxValue : (uint)position1;
this.endOfCentralDirectoryRecord.SizeOfCentralDirectory = num > (long)uint.MaxValue ? uint.MaxValue : (uint)num;
this.endOfCentralDirectoryRecord.WriteBlock(this.Writer);
if (this.Mode != ZipArchiveMode.Update)
{
return;
}
this.workingStream.Seek(0L, SeekOrigin.Begin);
this.originalStream.Seek(0L, SeekOrigin.Begin);
ZipFile.CopyStreamTo(this.workingStream, this.originalStream);
this.originalStream.SetLength(this.workingStream.Length);
}
private void ReadEndOfCentralDirectory()
{
try
{
this.Reader.BaseStream.Seek(-18L, SeekOrigin.End);
if (!ZipHelper.SeekBackwardsToSignature(this.Reader.BaseStream, 101010256U))
{
throw new InvalidDataException("End of central directory not found.");
}
long position = this.Reader.BaseStream.Position;
this.endOfCentralDirectoryRecord = new EndOfCentralDirectoryRecord();
if (!this.endOfCentralDirectoryRecord.TryReadBlock(this.archiveReader))
{
throw new InvalidDataException("End of central directory not found.");
}
if ((int)this.endOfCentralDirectoryRecord.NumberOfThisDisk != (int)this.endOfCentralDirectoryRecord.NumberOfTheDiskWithTheStartOfTheCentralDirectory)
{
throw new InvalidDataException("Splitted archive is not supported.");
}
if ((int)this.endOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory != (int)this.endOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectoryOnThisDisk)
{
throw new InvalidDataException("Splitted archive is not supported.");
}
if (this.endOfCentralDirectoryRecord.NumberOfThisDisk == ushort.MaxValue || this.endOfCentralDirectoryRecord.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber == uint.MaxValue || this.endOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory == ushort.MaxValue)
{
this.Reader.BaseStream.Seek(position - 16L, SeekOrigin.Begin);
if (ZipHelper.SeekBackwardsToSignature(this.Reader.BaseStream, 117853008U))
{
this.zip64EndOfCentralDirectoryLocator = new Zip64EndOfCentralDirectoryLocator();
if (!this.zip64EndOfCentralDirectoryLocator.TryReadBlock(this.archiveReader))
{
throw new InvalidDataException("ZIP64 End of central directory locator not found.");
}
if (this.zip64EndOfCentralDirectoryLocator.RelativeOffsetOfTheZip64EndOfCentralDirectoryRecord > (ulong)long.MaxValue)
{
throw new InvalidDataException("Relative offset of the Zip64 End Of Central Directory Record is too big.");
}
this.Reader.BaseStream.Seek((long)this.zip64EndOfCentralDirectoryLocator.RelativeOffsetOfTheZip64EndOfCentralDirectoryRecord, SeekOrigin.Begin);
this.zip64EndOfCentralDirectoryRecord = new Zip64EndOfCentralDirectoryRecord();
if (!this.zip64EndOfCentralDirectoryRecord.TryReadBlock(this.archiveReader))
{
throw new InvalidDataException("Zip64 End Of Central Directory Record not found.");
}
if (this.zip64EndOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory > (ulong)long.MaxValue)
{
throw new InvalidDataException("Number of entries is too big.");
}
if (this.zip64EndOfCentralDirectoryRecord.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber > (ulong)long.MaxValue)
{
throw new InvalidDataException("Relative offset of the Central Directory Start is too big.");
}
if ((long)this.zip64EndOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectory != (long)this.zip64EndOfCentralDirectoryRecord.NumberOfEntriesInTheCentralDirectoryOnThisDisk)
{
throw new InvalidDataException("Splitted archive is not supported.");
}
}
}
if (this.CentralDirectoryStart > this.Reader.BaseStream.Length)
{
throw new InvalidDataException("Relative offset of the Central Directory Start is too big.");
}
}
catch (EndOfStreamException ex)
{
throw new InvalidDataException("Archive corrupted", (Exception)ex);
}
catch (IOException ex)
{
throw new InvalidDataException("Archive corrupted", (Exception)ex);
}
}