(bufferDescribe card_id [buf_id])
If buf_id was specified:
(bufferDescribe card_id bufi)
Or, if buf_id was not specified:
(bufferDescribe card_id buf0...bufN)
The description of each buffer, bufi, is provided as
(buf_idi sizei offseti data_usedi)
where size is in bytes, offset is the internal buffer location in hex (the user cannot control this), and data_used is the portion of the card buffer that is mirrored within the driver (see the bufferActiveLength command).
Otherwise, the following error message:
(error "bufferDescribe DR_ERR_CARD_INVALID (time) invalid card: card_id")
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