internal static IntPtr FdiOpen(string filename, int oflag, int pmode)
{
FileMode mode = CabinetNativeApi.ConvertOpflagToFileMode(oflag);
FileAccess access = CabinetNativeApi.ConvertPermissionModeToFileAccess(pmode);
FileShare share = CabinetNativeApi.ConvertPermissionModeToFileShare(pmode);
// This method is used for opening the cab file as well as saving the extracted files.
// When we are opening the cab file we only need read permissions.
// We force read permissions so that non-elevated users can extract cab files.
if (mode == FileMode.Open || mode == FileMode.OpenOrCreate)
{
access = FileAccess.Read;
share = FileShare.Read;
}
try
{
FileStream stream = new FileStream(filename, mode, access, share);
if (stream == null)
{
return(new IntPtr(-1));
}
return(GCHandle.ToIntPtr(GCHandle.Alloc(stream)));
}
catch (IOException)
{
return(new IntPtr(-1));
}
}
internal override bool Extract(string cabinetName, string srcPath, string destPath)
{
IntPtr nativeDestPath = Marshal.StringToHGlobalAnsi(destPath);
bool result = CabinetNativeApi.FDICopy(
fdiContext,
cabinetName,
srcPath,
0, // Not used
Marshal.GetFunctionPointerForDelegate(_notifyDelegate),
IntPtr.Zero,
nativeDestPath);
Marshal.FreeHGlobal(nativeDestPath);
return(result);
}
internal CabinetNativeApi.FdiContextHandle fdiContext; // HFDI
internal CabinetExtractor()
{
CabinetNativeApi.FdiERF err = new CabinetNativeApi.FdiERF();
populateDelegates();
// marshal the delegate to a unmanaged function pointer so that AppDomain reference is stored correctly.
fdiContext = CabinetNativeApi.FDICreate(
Marshal.GetFunctionPointerForDelegate(_allocDelegate),
Marshal.GetFunctionPointerForDelegate(_freeDelegate),
Marshal.GetFunctionPointerForDelegate(_openDelegate),
Marshal.GetFunctionPointerForDelegate(_readDelegate),
Marshal.GetFunctionPointerForDelegate(_writeDelegate),
Marshal.GetFunctionPointerForDelegate(_closeDelegate),
Marshal.GetFunctionPointerForDelegate(_seekDelegate),
CabinetNativeApi.FdiCreateCpuType.Cpu80386,
err);
}
internal static int FdiSeek(IntPtr fp, int offset, int origin)
{
GCHandle handle = GCHandle.FromIntPtr(fp);
FileStream stream = (FileStream)handle.Target;
SeekOrigin seekOrigin = CabinetNativeApi.ConvertOriginToSeekOrigin(origin);
long status = 0;
try
{
status = stream.Seek(offset, seekOrigin);
}
catch (NotSupportedException) { status = -1; }
catch (IOException) { status = -1; }
catch (ArgumentException) { status = -1; }
catch (ObjectDisposedException) { status = -1; }
return((int)status);
}
protected override bool ReleaseHandle()
{
return(CabinetNativeApi.FDIDestroy(this.handle));
}
// Handles FDI notification
internal static IntPtr FdiNotify(FdiNotificationType fdint, FdiNotification fdin)
{
switch (fdint)
{
case FdiNotificationType.FdintCOPY_FILE:
{
// TODO: Should I catch exceptions for the new functions?
// Copy target directory
string destPath = Marshal.PtrToStringAnsi(fdin.pv);
// Split the path to a filename and path
string fileName = Path.GetFileName(fdin.psz1);
string remainingPsz1Path = Path.GetDirectoryName(fdin.psz1);
destPath = Path.Combine(destPath, remainingPsz1Path);
Directory.CreateDirectory(destPath); // Creates all intermediate directories if necessary.
// Create the file
string absoluteFilePath = Path.Combine(destPath, fileName);
return(CabinetNativeApi.FdiOpen(absoluteFilePath, (int)OpFlags.Create, (int)(PermissionMode.Read | PermissionMode.Write))); // TODO: OK to ignore _O_SEQUENTIAL, WrOnly, and _O_BINARY?
}
case FdiNotificationType.FdintCLOSE_FILE_INFO:
{
// Close the file
CabinetNativeApi.FdiClose(fdin.hf);
// Set the file attributes
string destPath = Marshal.PtrToStringAnsi(fdin.pv);
string absoluteFilePath = Path.Combine(destPath, fdin.psz1);
IntPtr hFile = PlatformInvokes.CreateFile(
absoluteFilePath,
PlatformInvokes.FileDesiredAccess.GenericRead | PlatformInvokes.FileDesiredAccess.GenericWrite,
PlatformInvokes.FileShareMode.Read,
IntPtr.Zero,
PlatformInvokes.FileCreationDisposition.OpenExisting,
PlatformInvokes.FileAttributes.Normal,
IntPtr.Zero);
if (hFile != IntPtr.Zero)
{
PlatformInvokes.FILETIME ftFile = new PlatformInvokes.FILETIME();
if (PlatformInvokes.DosDateTimeToFileTime(fdin.date, fdin.time, ftFile))
{
PlatformInvokes.FILETIME ftLocal = new PlatformInvokes.FILETIME();
if (PlatformInvokes.LocalFileTimeToFileTime(ftFile, ftLocal))
{
PlatformInvokes.SetFileTime(hFile, ftLocal, null, ftLocal);
}
}
PlatformInvokes.CloseHandle(hFile);
}
PlatformInvokes.SetFileAttributesW(
absoluteFilePath,
(PlatformInvokes.FileAttributes)fdin.attribs & (PlatformInvokes.FileAttributes.ReadOnly | PlatformInvokes.FileAttributes.Hidden | PlatformInvokes.FileAttributes.System | PlatformInvokes.FileAttributes.Archive));
// Call notification function
return(new IntPtr(1));
}
}
return(new IntPtr(0));
}