public static bool TryReadBlock(BinaryReader reader, out Zip64EndOfCentralDirectoryLocator zip64EOCDLocator)
{
zip64EOCDLocator = new Zip64EndOfCentralDirectoryLocator();
if (reader.ReadUInt32() != 0x7064b50)
{
return(false);
}
zip64EOCDLocator.NumberOfDiskWithZip64EOCD = reader.ReadUInt32();
zip64EOCDLocator.OffsetOfZip64EOCD = reader.ReadUInt64();
zip64EOCDLocator.TotalNumberOfDisks = reader.ReadUInt32();
return(true);
}
private void WriteArchiveEpilogue(long startOfCentralDirectory, long sizeOfCentralDirectory)
{
bool flag = false;
if (((startOfCentralDirectory >= 0xffffffffL) || (sizeOfCentralDirectory >= 0xffffffffL)) || (_entries.Count >= 0xffff))
{
flag = true;
}
if (flag)
{
long position = ArchiveStream1.Position;
Zip64EndOfCentralDirectoryRecord.WriteBlock(ArchiveStream1, (long)_entries.Count, startOfCentralDirectory, sizeOfCentralDirectory);
Zip64EndOfCentralDirectoryLocator.WriteBlock(ArchiveStream1, position);
}
ZipEndOfCentralDirectoryBlock.WriteBlock(ArchiveStream1, (long)_entries.Count, startOfCentralDirectory, sizeOfCentralDirectory, _archiveComment);
}
private void ReadEndOfCentralDirectory()
{
try
{
ZipEndOfCentralDirectoryBlock block;
ArchiveStream1.Seek(-18L, SeekOrigin.End);
if (!ZipHelper.SeekBackwardsToSignature(ArchiveStream1, 0x6054b50))
{
throw new InvalidDataException(Messages.EOCDNotFound);
}
long position = ArchiveStream1.Position;
ZipEndOfCentralDirectoryBlock.TryReadBlock(_archiveReader, out block);
if (block.NumberOfThisDisk != block.NumberOfTheDiskWithTheStartOfTheCentralDirectory)
{
throw new InvalidDataException(Messages.SplitSpanned);
}
_numberOfThisDisk = block.NumberOfThisDisk;
_centralDirectoryStart = block.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber;
if (block.NumberOfEntriesInTheCentralDirectory != block.NumberOfEntriesInTheCentralDirectoryOnThisDisk)
{
throw new InvalidDataException(Messages.SplitSpanned);
}
_expectedNumberOfEntries = block.NumberOfEntriesInTheCentralDirectory;
if (_mode == ZipArchiveMode.Update)
{
_archiveComment = block.ArchiveComment;
}
if (((block.NumberOfThisDisk == 0xffff) || (block.OffsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber == uint.MaxValue)) || (block.NumberOfEntriesInTheCentralDirectory == 0xffff))
{
ArchiveStream1.Seek(position - 0x10L, SeekOrigin.Begin);
if (ZipHelper.SeekBackwardsToSignature(ArchiveStream1, 0x7064b50))
{
Zip64EndOfCentralDirectoryLocator locator;
Zip64EndOfCentralDirectoryRecord record;
Zip64EndOfCentralDirectoryLocator.TryReadBlock(_archiveReader, out locator);
if (locator.OffsetOfZip64EOCD > 0x7fffffffffffffffL)
{
throw new InvalidDataException(Messages.FieldTooBigOffsetToZip64EOCD);
}
long offset = (long)locator.OffsetOfZip64EOCD;
ArchiveStream1.Seek(offset, SeekOrigin.Begin);
if (!Zip64EndOfCentralDirectoryRecord.TryReadBlock(_archiveReader, out record))
{
throw new InvalidDataException(Messages.Zip64EOCDNotWhereExpected);
}
_numberOfThisDisk = record.NumberOfThisDisk;
if (record.NumberOfEntriesTotal > 0x7fffffffffffffffL)
{
throw new InvalidDataException(Messages.FieldTooBigNumEntries);
}
if (record.OffsetOfCentralDirectory > 0x7fffffffffffffffL)
{
throw new InvalidDataException(Messages.FieldTooBigOffsetToCD);
}
if (record.NumberOfEntriesTotal != record.NumberOfEntriesOnThisDisk)
{
throw new InvalidDataException(Messages.SplitSpanned);
}
_expectedNumberOfEntries = (long)record.NumberOfEntriesTotal;
_centralDirectoryStart = (long)record.OffsetOfCentralDirectory;
}
}
if (_centralDirectoryStart > ArchiveStream1.Length)
{
throw new InvalidDataException(Messages.FieldTooBigOffsetToCD);
}
}
catch (EndOfStreamException exception)
{
throw new InvalidDataException(Messages.CDCorrupt, exception);
}
catch (IOException exception2)
{
throw new InvalidDataException(Messages.CDCorrupt, exception2);
}
}