93 lines
4.2 KiB
C
93 lines
4.2 KiB
C
/* buffer.h
|
|
|
|
Definitions for the object management API protocol buffering... */
|
|
|
|
/*
|
|
* Copyright (c) 1996-1999 Internet Software Consortium.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of The Internet Software Consortium nor the names
|
|
* of its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
|
|
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This software has been written for the Internet Software Consortium
|
|
* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
|
|
* To learn more about the Internet Software Consortium, see
|
|
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
|
|
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
|
|
* ``http://www.nominum.com''.
|
|
*/
|
|
|
|
/* OMAPI buffers are ring buffers, which means that the beginning of the
|
|
buffer and the end of the buffer chase each other around. As long as
|
|
the tail never catches up to the head, there's room in the buffer for
|
|
data.
|
|
|
|
- If the tail and the head are equal, the buffer is empty.
|
|
|
|
- If the tail is less than the head, the contents of the buffer
|
|
are the bytes from the head to the end of buffer, and in addition,
|
|
the bytes between the beginning of the buffer and the tail, not
|
|
including the byte addressed by the tail.
|
|
|
|
- If the tail is greater than the head, then the buffer contains
|
|
valid bytes starting with the byte addressed by the head, and
|
|
ending with the byte before the byte addressed by the tail.
|
|
|
|
There will always be at least one byte of waste, because the tail can't
|
|
increase so that it's equal to the head (that would represent an empty
|
|
buffer. */
|
|
#define OMAPI_BUF_SIZE 4048
|
|
typedef struct _omapi_buffer {
|
|
struct _omapi_buffer *next; /* Buffers can be chained. */
|
|
u_int32_t refcnt; /* Buffers are reference counted. */
|
|
u_int16_t head, tail; /* Buffers are organized in a ring. */
|
|
char buf [OMAPI_BUF_SIZE]; /* The actual buffer is included in
|
|
the buffer data structure. */
|
|
} omapi_buffer_t;
|
|
|
|
#define BUFFER_BYTES_FREE(x) \
|
|
((x) -> tail > (x) -> head \
|
|
? sizeof ((x) -> buf) - ((x) -> tail - (x) -> head) \
|
|
: (x) -> head - (x) -> tail)
|
|
|
|
#define BYTES_IN_BUFFER(x) \
|
|
((x) -> tail > (x) -> head \
|
|
? (x) -> tail - (x) -> head - 1 \
|
|
: sizeof ((x) -> buf) - ((x) -> head - (x) -> tail) - 1)
|
|
|
|
isc_result_t omapi_connection_require (omapi_object_t *, unsigned);
|
|
isc_result_t omapi_connection_copyout (unsigned char *,
|
|
omapi_object_t *, unsigned);
|
|
isc_result_t omapi_connection_copyin (omapi_object_t *,
|
|
const unsigned char *, unsigned);
|
|
isc_result_t omapi_connection_flush (omapi_object_t *);
|
|
isc_result_t omapi_connection_get_uint32 (omapi_object_t *, u_int32_t *);
|
|
isc_result_t omapi_connection_put_uint32 (omapi_object_t *, u_int32_t);
|
|
isc_result_t omapi_connection_get_uint16 (omapi_object_t *, u_int16_t *);
|
|
isc_result_t omapi_connection_put_uint16 (omapi_object_t *, u_int32_t);
|
|
|