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/*
* ngtcp2
*
* Copyright (c) 2018 ngtcp2 contributors
*
* 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 NGTCP2_VEC_H
#define NGTCP2_VEC_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_mem.h"
/*
* ngtcp2_vec_lit is a convenient macro to fill the object pointed by
* |DEST| with the literal string |LIT|.
*/
#define ngtcp2_vec_lit(DEST, LIT) \
((DEST)->base = (uint8_t *)(LIT), (DEST)->len = sizeof(LIT) - 1, (DEST))
/*
* ngtcp2_vec_init initializes |vec| with the given parameters. It
* returns |vec|.
*/
ngtcp2_vec *ngtcp2_vec_init(ngtcp2_vec *vec, const uint8_t *base, size_t len);
/*
* ngtcp2_vec_new allocates and initializes |*pvec| with given |data|
* of length |datalen|. This function allocates memory for |*pvec|
* and the given data with a single allocation, and the contents
* pointed by |data| is copied into the allocated memory space. To
* free the allocated memory, call ngtcp2_vec_del.
*/
int ngtcp2_vec_new(ngtcp2_vec **pvec, const uint8_t *data, size_t datalen,
const ngtcp2_mem *mem);
/*
* ngtcp2_vec_del frees the memory allocated by |vec| which is
* allocated and initialized by ngtcp2_vec_new.
*/
void ngtcp2_vec_del(ngtcp2_vec *vec, const ngtcp2_mem *mem);
/*
* ngtcp2_vec_len returns the sum of length in |vec| of |n| elements.
*/
uint64_t ngtcp2_vec_len(const ngtcp2_vec *vec, size_t n);
/*
* ngtcp2_vec_len_varint is similar to ngtcp2_vec_len, but it returns
* -1 if the sum of the length exceeds NGTCP2_MAX_VARINT.
*/
int64_t ngtcp2_vec_len_varint(const ngtcp2_vec *vec, size_t n);
/*
* ngtcp2_vec_split splits |src| to |dst| so that the sum of the
* length in |src| does not exceed |left| bytes. The |maxcnt| is the
* maximum number of elements which |dst| array can contain. The
* caller must set |*psrccnt| to the number of elements of |src|.
* Similarly, the caller must set |*pdstcnt| to the number of elements
* of |dst|. The split does not necessarily occur at the boundary of
* ngtcp2_vec object. After split has done, this function updates
* |*psrccnt| and |*pdstcnt|. This function returns the number of
* bytes moved from |src| to |dst|. If split cannot be made because
* doing so exceeds |maxcnt|, this function returns -1.
*/
ngtcp2_ssize ngtcp2_vec_split(ngtcp2_vec *src, size_t *psrccnt, ngtcp2_vec *dst,
size_t *pdstcnt, size_t left, size_t maxcnt);
/*
* ngtcp2_vec_merge merges |src| into |dst| by moving at most |left|
* bytes from |src|. The |maxcnt| is the maximum number of elements
* which |dst| array can contain. The caller must set |*pdstcnt| to
* the number of elements of |dst|. Similarly, the caller must set
* |*psrccnt| to the number of elements of |src|. After merge has
* done, this function updates |*psrccnt| and |*pdstcnt|. This
* function returns the number of bytes moved from |src| to |dst|.
*/
size_t ngtcp2_vec_merge(ngtcp2_vec *dst, size_t *pdstcnt, ngtcp2_vec *src,
size_t *psrccnt, size_t left, size_t maxcnt);
/*
* ngtcp2_vec_copy_at_most copies |src| of length |srccnt| to |dst| of
* length |dstcnt|. The total number of bytes which the copied
* ngtcp2_vec refers to is at most |left|. The empty elements in
* |src| are ignored. This function returns the number of elements
* copied.
*/
size_t ngtcp2_vec_copy_at_most(ngtcp2_vec *dst, size_t dstcnt,
const ngtcp2_vec *src, size_t srccnt,
size_t left);
/*
* ngtcp2_vec_copy copies |src| of length |cnt| to |dst|. |dst| must
* have sufficient capacity.
*/
void ngtcp2_vec_copy(ngtcp2_vec *dst, const ngtcp2_vec *src, size_t cnt);
#endif /* NGTCP2_VEC_H */
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