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/*
* include/haproxy/buf-t.h
* Simple buffer handling - types definitions.
*
* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _HAPROXY_BUF_T_H
#define _HAPROXY_BUF_T_H
#include <haproxy/api-t.h>
/* Structure defining a buffer's head */
struct buffer {
size_t size; /* buffer size in bytes */
char *area; /* points to <size> bytes */
size_t data; /* amount of data after head including wrapping */
size_t head; /* start offset of remaining data relative to area */
};
/* A buffer may be in 3 different states :
* - unallocated : size == 0, area == 0 (b_is_null() is true)
* - waiting : size == 0, area != 0 (b_is_null() is true)
* - allocated : size > 0, area > 0 (b_is_null() is false)
*/
/* initializers for certain buffer states. It is important that the NULL buffer
* remains the one with all fields initialized to zero so that a calloc() or a
* memset() on a struct automatically sets a NULL buffer.
*/
#define BUF_NULL ((struct buffer){ })
#define BUF_WANTED ((struct buffer){ .area = (char *)1 })
#define BUF_RING ((struct buffer){ .area = (char *)2 })
#endif /* _HAPROXY_BUF_T_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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