private void ProcessAESExtraData(ZipExtraData extraData)
{
if (!extraData.Find(0x9901))
{
throw new ZipException("AES Extra Data missing");
}
versionToExtract = 0x33;
Flags |= 0x40;
int valueLength = extraData.ValueLength;
if (valueLength < 7)
{
throw new ZipException("AES Extra Data Length " + valueLength + " invalid.");
}
extraData.ReadShort();
extraData.ReadShort();
int num3 = extraData.ReadByte();
int num4 = extraData.ReadShort();
_aesEncryptionStrength = num3;
method = (CompressionMethod)num4;
}
internal void ProcessExtraData(bool localHeader)
{
ZipExtraData extraData = new ZipExtraData(extra);
if (extraData.Find(1))
{
forceZip64_ = true;
if (extraData.ValueLength < 4)
{
throw new ZipException("Extra data extended Zip64 information length is invalid");
}
if (localHeader || (size == 0xffffffffL))
{
size = (ulong)extraData.ReadLong();
}
if (localHeader || (compressedSize == 0xffffffffL))
{
compressedSize = (ulong)extraData.ReadLong();
}
if (!localHeader && (offset == 0xffffffffL))
{
offset = extraData.ReadLong();
}
}
else if (((versionToExtract & 0xff) >= 0x2d) && ((size == 0xffffffffL) || (compressedSize == 0xffffffffL)))
{
throw new ZipException("Zip64 Extended information required but is missing.");
}
if (extraData.Find(10))
{
if (extraData.ValueLength < 4)
{
throw new ZipException("NTFS Extra data invalid");
}
extraData.ReadInt();
while (extraData.UnreadCount >= 4)
{
int num = extraData.ReadShort();
int amount = extraData.ReadShort();
if (num == 1)
{
if (amount >= 0x18)
{
long fileTime = extraData.ReadLong();
extraData.ReadLong();
extraData.ReadLong();
DateTime = DateTime.FromFileTime(fileTime);
}
break;
}
extraData.Skip(amount);
}
}
else if (extraData.Find(0x5455))
{
int valueLength = extraData.ValueLength;
if (((extraData.ReadByte() & 1) != 0) && (valueLength >= 5))
{
int seconds = extraData.ReadInt();
DateTime time = new DateTime(0x7b2, 1, 1, 0, 0, 0);
DateTime = (time.ToUniversalTime() + new TimeSpan(0, 0, 0, seconds, 0)).ToLocalTime();
}
}
if (method == CompressionMethod.WinZipAES)
{
ProcessAESExtraData(extraData);
}
}