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contrib/pgcrypto/mbuf.h
122 строки
4 KB
Peter Geoghegan
Harmonize parameter names in contrib code.
22 сен 2022, 23:59
22 сен 2022, 23:59
0faf7d9
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/* * 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_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 len); int mbuf_free(MBuf *mbuf); /* * Push filter */ int pushf_create(PushFilter **mp_p, const PushFilterOps *op, 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 **res, MBuf *dst); /* * Pull filter */ int pullf_create(PullFilter **pf_p, const PullFilterOps *op, void *init_arg, PullFilter *src); int pullf_read(PullFilter *pf, int len, uint8 **data_p); int pullf_read_max(PullFilter *pf, int len, uint8 **data_p, uint8 *tmpbuf); void pullf_free(PullFilter *pf); int pullf_read_fixed(PullFilter *src, int len, uint8 *dst); int pullf_create_mbuf_reader(PullFilter **mp_p, MBuf *src); #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 */