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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.
*/
#include "ngtcp2_vec.h"
#include <string.h>
#include <assert.h>
#include "ngtcp2_str.h"
ngtcp2_vec *ngtcp2_vec_init(ngtcp2_vec *vec, const uint8_t *base, size_t len) {
vec->base = (uint8_t *)base;
vec->len = len;
return vec;
}
int ngtcp2_vec_new(ngtcp2_vec **pvec, const uint8_t *data, size_t datalen,
const ngtcp2_mem *mem) {
size_t len;
uint8_t *p;
len = sizeof(ngtcp2_vec) + datalen;
*pvec = ngtcp2_mem_malloc(mem, len);
if (*pvec == NULL) {
return NGTCP2_ERR_NOMEM;
}
p = (uint8_t *)(*pvec) + sizeof(ngtcp2_vec);
(*pvec)->base = p;
(*pvec)->len = datalen;
if (datalen) {
/* p = */ ngtcp2_cpymem(p, data, datalen);
}
return 0;
}
void ngtcp2_vec_del(ngtcp2_vec *vec, const ngtcp2_mem *mem) {
ngtcp2_mem_free(mem, vec);
}
uint64_t ngtcp2_vec_len(const ngtcp2_vec *vec, size_t n) {
size_t i;
size_t res = 0;
for (i = 0; i < n; ++i) {
res += vec[i].len;
}
return res;
}
int64_t ngtcp2_vec_len_varint(const ngtcp2_vec *vec, size_t n) {
uint64_t res = 0;
size_t len;
size_t i;
for (i = 0; i < n; ++i) {
len = vec[i].len;
if (len > NGTCP2_MAX_VARINT - res) {
return -1;
}
res += len;
}
return (int64_t)res;
}
ngtcp2_ssize ngtcp2_vec_split(ngtcp2_vec *src, size_t *psrccnt, ngtcp2_vec *dst,
size_t *pdstcnt, size_t left, size_t maxcnt) {
size_t i;
size_t srccnt = *psrccnt;
size_t nmove;
size_t extra = 0;
for (i = 0; i < srccnt; ++i) {
if (left >= src[i].len) {
left -= src[i].len;
continue;
}
if (*pdstcnt && src[srccnt - 1].base + src[srccnt - 1].len == dst[0].base) {
if (*pdstcnt + srccnt - i - 1 > maxcnt) {
return -1;
}
dst[0].len += src[srccnt - 1].len;
dst[0].base = src[srccnt - 1].base;
extra = src[srccnt - 1].len;
--srccnt;
} else if (*pdstcnt + srccnt - i > maxcnt) {
return -1;
}
if (left == 0) {
*psrccnt = i;
} else {
*psrccnt = i + 1;
}
nmove = srccnt - i;
if (nmove) {
memmove(dst + nmove, dst, sizeof(ngtcp2_vec) * (*pdstcnt));
*pdstcnt += nmove;
memcpy(dst, src + i, sizeof(ngtcp2_vec) * nmove);
}
dst[0].len -= left;
dst[0].base += left;
src[i].len = left;
if (nmove == 0) {
extra -= left;
}
return (ngtcp2_ssize)(ngtcp2_vec_len(dst, nmove) + extra);
}
return 0;
}
size_t ngtcp2_vec_merge(ngtcp2_vec *dst, size_t *pdstcnt, ngtcp2_vec *src,
size_t *psrccnt, size_t left, size_t maxcnt) {
size_t orig_left = left;
size_t i;
ngtcp2_vec *a, *b;
assert(maxcnt);
if (*pdstcnt == 0) {
if (*psrccnt == 0) {
return 0;
}
a = &dst[0];
b = &src[0];
if (left >= b->len) {
*a = *b;
++*pdstcnt;
left -= b->len;
i = 1;
} else {
a->len = left;
a->base = b->base;
b->len -= left;
b->base += left;
return left;
}
} else {
i = 0;
}
for (; left && i < *psrccnt; ++i) {
a = &dst[*pdstcnt - 1];
b = &src[i];
if (left >= b->len) {
if (a->base + a->len == b->base) {
a->len += b->len;
} else if (*pdstcnt == maxcnt) {
break;
} else {
dst[(*pdstcnt)++] = *b;
}
left -= b->len;
continue;
}
if (a->base + a->len == b->base) {
a->len += left;
} else if (*pdstcnt == maxcnt) {
break;
} else {
dst[*pdstcnt].len = left;
dst[*pdstcnt].base = b->base;
++*pdstcnt;
}
b->len -= left;
b->base += left;
left = 0;
break;
}
memmove(src, src + i, sizeof(ngtcp2_vec) * (*psrccnt - i));
*psrccnt -= i;
return orig_left - left;
}
size_t ngtcp2_vec_copy_at_most(ngtcp2_vec *dst, size_t dstcnt,
const ngtcp2_vec *src, size_t srccnt,
size_t left) {
size_t i, j;
for (i = 0, j = 0; left > 0 && i < srccnt && j < dstcnt;) {
if (src[i].len == 0) {
++i;
continue;
}
dst[j] = src[i];
if (dst[j].len > left) {
dst[j].len = left;
return j + 1;
}
left -= dst[j].len;
++i;
++j;
}
return j;
}
void ngtcp2_vec_copy(ngtcp2_vec *dst, const ngtcp2_vec *src, size_t cnt) {
memcpy(dst, src, sizeof(ngtcp2_vec) * cnt);
}
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