internal static int SafeStgOpenStorageOnStream(
Stream s,
int grfMode,
out IStorage ppstgOpen
)
{
Invariant.Assert(s != null, "s cannot be null");
UnsafeNativeCompoundFileMethods.UnsafeNativeIStorage storage;
UnsafeNativeCompoundFileMethods.UnsafeLockBytesOnStream lockByteStream = new UnsafeNativeCompoundFileMethods.UnsafeLockBytesOnStream(s);
int result;
result = UnsafeNativeCompoundFileMethods.StgOpenStorageOnILockBytes(
(UnsafeNativeCompoundFileMethods.UnsafeNativeILockBytes)lockByteStream,
null,
grfMode,
new IntPtr(0), // Pointer to SNB struct, not marshalled, must be null.
0,
out storage);
if (result == SafeNativeCompoundFileConstants.S_OK)
{
ppstgOpen = new SafeIStorageImplementation(storage);
}
else
{
ppstgOpen = null;
lockByteStream.Dispose();
}
return(result);
}
internal static int SafeStgOpenStorageEx(
string pwcsName, //Pointer to path of compound file to create
int grfMode, // Specifies the access mode for opening the storage object
int stgfmt, // Specifies the storage file format, 5 is DocFile
int grfAttrs, // Reserved; must be zero
IntPtr pStgOptions, // Pointer to STGOPTIONS, not marshalled, must use NULL.
IntPtr reserved2, // Reserved; must be null
ref Guid riid, // Specifies the GUID of the interface pointer
out IStorage ppObjectOpen //Pointer to an interface pointer
)
{
UnsafeNativeCompoundFileMethods.UnsafeNativeIStorage storage;
int result;
result = UnsafeNativeCompoundFileMethods.StgOpenStorageEx(
pwcsName,
grfMode,
stgfmt,
grfAttrs,
pStgOptions,
reserved2,
ref riid,
out storage);
if (result == SafeNativeCompoundFileConstants.S_OK)
{
ppObjectOpen = new SafeIStorageImplementation(storage);
}
else
{
ppObjectOpen = null;
}
return(result);
}
internal static int SafeStgCreateDocfileOnStream(
Stream s,
int grfMode,
out IStorage ppstgOpen
)
{
Invariant.Assert(s != null, "s cannot be null");
UnsafeNativeCompoundFileMethods.UnsafeNativeIStorage storage;
UnsafeNativeCompoundFileMethods.UnsafeLockBytesOnStream lockByteStream = new UnsafeNativeCompoundFileMethods.UnsafeLockBytesOnStream(s);
int result;
result = UnsafeNativeCompoundFileMethods.StgCreateDocfileOnILockBytes(
(UnsafeNativeCompoundFileMethods.UnsafeNativeILockBytes)lockByteStream,
grfMode,
0, // Must be zero
out storage);
if (result == SafeNativeCompoundFileConstants.S_OK)
{
ppstgOpen = new SafeIStorageImplementation(storage, lockByteStream);
}
else
{
ppstgOpen = null;
lockByteStream.Dispose();
}
return(result);
}
internal static int SafePropVariantClear(ref PROPVARIANT pvar)
{
return(UnsafeNativeCompoundFileMethods.PropVariantClear(ref pvar));
}
internal SafeIPropertyStorageImplementation(UnsafeNativeCompoundFileMethods.UnsafeNativeIPropertyStorage propertyStorage)
{
_unsafePropertyStorage = propertyStorage;
}
internal SafeIEnumSTATPROPSETSTGImplementation(UnsafeNativeCompoundFileMethods.UnsafeNativeIEnumSTATPROPSETSTG enumSTATPROPSETSTG)
{
_unsafeEnumSTATPROPSETSTG = enumSTATPROPSETSTG;
}
internal SafeIStreamImplementation(UnsafeNativeCompoundFileMethods.UnsafeNativeIStream stream)
{
_unsafeStream = stream;
}
internal SafeIStorageImplementation(UnsafeNativeCompoundFileMethods.UnsafeNativeIStorage storage,
UnsafeNativeCompoundFileMethods.UnsafeLockBytesOnStream lockBytesStream)
{
SecurityHelper.DemandCompoundFileIOPermission();
if (storage == null)
{
throw new ArgumentNullException("storage");
}
_unsafeStorage = storage;
_unsafePropertySetStorage = (UnsafeNativeCompoundFileMethods.UnsafeNativeIPropertySetStorage) _unsafeStorage;
_unsafeLockByteStream = lockBytesStream;
}
internal SafeIStorageImplementation(UnsafeNativeCompoundFileMethods.UnsafeNativeIStorage storage)
: this(storage, null)
{
}
// <SecurityNote>
// Critical: This method calls security suppressed unmanaged CompoundFile code.
// ComoundFileIOPermission needs to be demanded to ensure that the only calls
// that can go through must be either done in Full Trust or with under assertion of
// CompoundFileIOPermission.
// SecurityTreatAsSafe: Demands CompoundFileIOPermission before it makes any calls to
// unmanaged APIs
// </SecurityNote>
internal static int SafePropVariantClear(ref PROPVARIANT pvar)
{
SecurityHelper.DemandCompoundFileIOPermission();
return(UnsafeNativeCompoundFileMethods.PropVariantClear(ref pvar));
}
