internal void ProcessExtraData(bool localHeader)
{
StiZipExtraData extraData = new StiZipExtraData(this.extra);
if (extraData.Find(0x0001))
{
//forceZip64_ = true;
if (extraData.ValueLength < 4)
{
throw new StiZipException("Extra data extended Zip64 information length is invalid");
}
if (localHeader || (size == uint.MaxValue))
{
size = (ulong)extraData.ReadLong();
}
if (localHeader || (compressedSize == uint.MaxValue))
{
compressedSize = (ulong)extraData.ReadLong();
}
if (!localHeader && (offset == uint.MaxValue))
{
offset = extraData.ReadLong();
}
}
if (method == CompressionMethod.WinZipAES)
{
throw new StiZipException("Encryption is not supported");
}
}
private long LocateEntry(StiZipEntry entry)
{
_baseStream.Seek(offsetOfFirstEntry + entry.Offset, SeekOrigin.Begin);
if ((int)ReadLEUint() != StiZipConstants.LocalHeaderSignature)
{
throw new StiZipException(string.Format("Wrong local header signature @{0:X}",
offsetOfFirstEntry + entry.Offset));
}
short extractVersion = (short)ReadLEUshort();
short localFlags = (short)ReadLEUshort();
short compressionMethod = (short)ReadLEUshort();
short fileTime = (short)ReadLEUshort();
short fileDate = (short)ReadLEUshort();
uint crcValue = ReadLEUint();
long compressedSize = ReadLEUint();
long size = ReadLEUint();
int storedNameLength = ReadLEUshort();
int extraDataLength = ReadLEUshort();
byte[] nameData = new byte[storedNameLength];
Utils.ReadFully(_baseStream, nameData);
byte[] extraData = new byte[extraDataLength];
Utils.ReadFully(_baseStream, extraData);
StiZipExtraData localExtraData = new StiZipExtraData(extraData);
if (entry.IsFile)
{
if (!entry.IsCompressionMethodSupported())
{
throw new StiZipException("Compression method not supported");
}
if ((extractVersion > StiZipConstants.VersionMadeBy) ||
((extractVersion > 20) && (extractVersion < StiZipConstants.VersionZip64)) ||
((localFlags &
(int)
(GeneralBitFlags.Patched | GeneralBitFlags.StrongEncryption | GeneralBitFlags.EnhancedCompress |
GeneralBitFlags.HeaderMasked)) != 0))
{
throw new StiZipException("The library does not support the zip version required to extract this entry");
}
}
int extraLength = storedNameLength + extraDataLength;
return(offsetOfFirstEntry + entry.Offset + StiZipConstants.LocalHeaderBaseSize + extraLength);
}
