plane can be determined using buf.nblock,
buf.nline, buf.nsample and sizeof the datatype field. It can be used
for bulk transfers. There are also a block and row vectors (Illiffe
vectors) pointing to each block and row of the main array to support
C bracket [] index notation for a 3D-array. It can be ignored. The
structure does maintain dynamic memory, so use MtkDataBuffer3DFree
when finished with this structure.</P>
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