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