BloombergLP::bdlbb::BlobUtil::getContiguousDataBuffer

Obtain contiguous storage for at least the specified addLength bytes in the specified blob at position blob‐>length(), and then grow blob‐>length() by addLength. If, upon entry, such storage does not exist in blob, first trim the final data buffer, if any, and insert a new buffer obtained from the specified factory. Return a pointer to the beginning of the storage obtained. The behavior of this function is undefined unless 0 < addLength, and factory‐>allocate(), if called, yields a block of memory of a size at least as large as addLength.