Starts an IO buffer reader.
INKIOBufferBlock INKIOBufferReaderStart
(INKIOBufferReader
readerp
)
Gets the read start block for the IO buffer reader.
INKIOBufferReaderStart
may return
NULL
if there is no data available for reading; it
may also return an IO buffer block with no data available for
reading. You should check for both conditions.
The read start block for the IO buffer reader.
INK_ERROR_PTR
if an error occurs.