private bool IsCabinet(Stream cabStream, out short id, out int cabFolderCount, out int fileCount)
{
int streamHandle = StreamHandles.AllocHandle(cabStream);
try {
Erf.Clear();
NativeMethods.FDI.CABINFO fdici;
bool isCabinet = 0 != NativeMethods.FDI.IsCabinet(fdiHandle, streamHandle, out fdici);
if (Erf.Error)
{
if (((NativeMethods.FDI.ERROR)Erf.Oper) == NativeMethods.FDI.ERROR.UNKNOWN_CABINET_VERSION)
{
isCabinet = false;
}
else
{
throw new CabException(
Erf.Oper,
Erf.Type,
CabException.GetErrorMessage(Erf.Oper, Erf.Type, true));
}
}
id = fdici.setID;
cabFolderCount = fdici.cFolders;
fileCount = fdici.cFiles;
return(isCabinet);
} finally {
StreamHandles.FreeHandle(streamHandle);
}
}
public CabUnpacker(CabEngine cabEngine)
: base(cabEngine)
{
fdiAllocMemHandler = CabAllocMem;
fdiFreeMemHandler = CabFreeMem;
fdiOpenStreamHandler = CabOpenStream;
fdiReadStreamHandler = CabReadStream;
fdiWriteStreamHandler = CabWriteStream;
fdiCloseStreamHandler = CabCloseStream;
fdiSeekStreamHandler = CabSeekStream;
fdiHandle = NativeMethods.FDI.Create(
fdiAllocMemHandler,
fdiFreeMemHandler,
fdiOpenStreamHandler,
fdiReadStreamHandler,
fdiWriteStreamHandler,
fdiCloseStreamHandler,
fdiSeekStreamHandler,
NativeMethods.FDI.CPU_80386,
ErfHandle.AddrOfPinnedObject());
if (Erf.Error)
{
int error = Erf.Oper;
int errorCode = Erf.Type;
ErfHandle.Free();
throw new CabException(
error,
errorCode,
CabException.GetErrorMessage(error, errorCode, true));
}
}
protected void CheckError(bool extracting)
{
if (Erf.Error)
{
throw new CabException(
Erf.Oper,
Erf.Type,
CabException.GetErrorMessage(Erf.Oper, Erf.Type, extracting));
}
}