iobuf: Add the IOBUF_INPUT_TEMP type to improve input temp handling.

* common/iobuf.h (enum iobuf_use): Add new member, IOBUF_INPUT_TEMP.
* common/iobuf.c (iobuf_temp_with_content): Create the iobuf as an
IOBUF_INPUT_TEMP, not an IOBUF_INPUT buffer.  Assert that LENGTH ==
A->D.SIZE.
(iobuf_push_filter2): If A is an IOBUF_INPUT_TEMP, then make the new
filter an IOBUF_INPUT filter and set its buffer size to
IOBUF_BUFFER_SIZE.
(underflow): If A is an IOBUF_INPUT_TEMP, then just return EOF; don't
remove already read data.
(iobuf_seek): If A is an IOBUF_INPUT_TEMP, don't discard the buffered
data.
(iobuf_alloc): Allow USE == IOBUF_INPUT_TEMP.
(pop_filter): Allow USE == IOBUF_INPUT_TEMP.
(iobuf_peek): Allow USE == IOBUF_INPUT_TEMP.
(iobuf_writebyte): Fail if USE == IOBUF_INPUT_TEMP.
(iobuf_write): Fail if USE == IOBUF_INPUT_TEMP.
(iobuf_writestr): Fail if USE == IOBUF_INPUT_TEMP.
(iobuf_flush_temp): Fail if USE == IOBUF_INPUT_TEMP.

--
Signed-off-by: Neal H. Walfield <[email protected]>.

Introduce a new iobuf type, IOBUF_INPUT_TEMP.  Use this for the iobuf
created by iobuf_temp_with_content instead of IOBUF_INPUT.  This was
necessary so that seeking and peeking correctly work on this type of
iobuf.  In particular, seeking didn't work because we discarded the
buffered data and peeking didn't work because we discarded data which
was already read, which made seeking later impossible.

0 files changed, 0 insertions, 0 deletions