| /* |
| * mbuf.h |
| * Memory buffer operations. |
| * |
| * Copyright (c) 2005 Marko Kreen |
| * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. |
| * |
| * contrib/pgcrypto/mbuf.h |
| */ |
| |
| #ifndef __PX_MBUF_H |
| #define __PX_MBUF_H |
| |
| typedef struct MBuf MBuf; |
| typedef struct PushFilter PushFilter; |
| typedef struct PullFilter PullFilter; |
| typedef struct PushFilterOps PushFilterOps; |
| typedef struct PullFilterOps PullFilterOps; |
| |
| struct PushFilterOps |
| { |
| /* |
| * should return needed buffer size, 0- no buffering, <0 on error if NULL, |
| * no buffering, and priv=init_arg |
| */ |
| int (*init) (PushFilter *next, void *init_arg, void **priv_p); |
| |
| /* |
| * send data to next. should consume all? if null, it will be simply |
| * copied (in-place) returns 0 on error |
| */ |
| int (*push) (PushFilter *next, void *priv, |
| const uint8 *src, int len); |
| int (*flush) (PushFilter *next, void *priv); |
| void (*free) (void *priv); |
| }; |
| |
| struct PullFilterOps |
| { |
| /* |
| * should return needed buffer size, 0- no buffering, <0 on error if NULL, |
| * no buffering, and priv=init_arg |
| */ |
| int (*init) (void **priv_p, void *init_arg, PullFilter *src); |
| |
| /* |
| * request data from src, put result ptr to data_p can use ptr from src or |
| * use buf as work area if NULL in-place copy |
| */ |
| int (*pull) (void *priv, PullFilter *src, int len, |
| uint8 **data_p, uint8 *buf, int buflen); |
| void (*free) (void *priv); |
| }; |
| |
| /* |
| * Memory buffer |
| */ |
| MBuf *mbuf_create(int len); |
| MBuf *mbuf_create_from_data(uint8 *data, int len); |
| int mbuf_tell(MBuf *mbuf); |
| int mbuf_avail(MBuf *mbuf); |
| int mbuf_size(MBuf *mbuf); |
| int mbuf_grab(MBuf *mbuf, int len, uint8 **data_p); |
| int mbuf_steal_data(MBuf *mbuf, uint8 **data_p); |
| int mbuf_append(MBuf *dst, const uint8 *buf, int cnt); |
| int mbuf_rewind(MBuf *mbuf); |
| int mbuf_free(MBuf *mbuf); |
| |
| /* |
| * Push filter |
| */ |
| int pushf_create(PushFilter **res, const PushFilterOps *ops, void *init_arg, |
| PushFilter *next); |
| int pushf_write(PushFilter *mp, const uint8 *data, int len); |
| void pushf_free_all(PushFilter *mp); |
| void pushf_free(PushFilter *mp); |
| int pushf_flush(PushFilter *mp); |
| |
| int pushf_create_mbuf_writer(PushFilter **mp_p, MBuf *mbuf); |
| |
| /* |
| * Pull filter |
| */ |
| int pullf_create(PullFilter **res, const PullFilterOps *ops, |
| void *init_arg, PullFilter *src); |
| int pullf_read(PullFilter *mp, int len, uint8 **data_p); |
| int pullf_read_max(PullFilter *mp, int len, |
| uint8 **data_p, uint8 *tmpbuf); |
| void pullf_free(PullFilter *mp); |
| int pullf_read_fixed(PullFilter *src, int len, uint8 *dst); |
| |
| int pullf_create_mbuf_reader(PullFilter **pf_p, MBuf *mbuf); |
| |
| #define GETBYTE(pf, dst) \ |
| do { \ |
| uint8 __b; \ |
| int __res = pullf_read_fixed(pf, 1, &__b); \ |
| if (__res < 0) \ |
| return __res; \ |
| (dst) = __b; \ |
| } while (0) |
| |
| #endif /* __PX_MBUF_H */ |