A string name block (SNB) is a pointer to an array of pointers to strings,
that ends in a NULL pointer. String name blocks are used the IStorage
interface and API calls that open storage objects. The strings point to
contained storage objects or streams that are to be excluded in the open calls.
typedef OLESTR **SNB
The SNB should be created by allocating a contiguous block of memory in which
the pointers to strings are followed by a NULL pointer, which is then followed
by the actual strings.
The marshalling of a string name block is based on the assumption that the SNB
passed in was created this way. Although it could be stored in other ways, the
SNB created in this manner has the advantage of requiring only one allocation
operation and one freeing of memory for all the strings.
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