H5VLblob_get

herr_t H5VLblob_get(void *  obj,  hid_t connector_id,  const  void *  blob_id,  void *  buf,
       size_t size,  void * *  req)

Gets a blob through the VOL.

`obj`	Object containing blob
`connector_id`	VOL connector identifier
`blob_id`	Blob identifier
`buf`	Buffer to receive blob data
`size`	Size of buffer
`req`	Async request object (can be null)

Non-negative on success, negative on failure.