public ZipOutputStream(Stream baseStream, CompressionMethod method)
: base(baseStream, StreamOperationMode.Write, ZipHelper.GetCompressionSettings(method, (CompressionSettings)null), false, (EncryptionSettings)null)
{
}
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);
}
}