Drawing Record msofbtDg
The drawing record is very simple, with just a count and MSOSPID seed. The attentive reader may expect to find the size of the drawing recorded here, but that information is stored elsewhere by the host application.
// FDG - File DG
typedef struct _FDG
{
ULONG csp; // The number of shapes in this drawing
MSOSPID spidCur; // The last MSOSPID given to an SP in this DG
} FDG;