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Mini Shell
Mini Shell
/*
* ngtcp2
*
* Copyright (c) 2017 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_rob.h"
#include <string.h>
#include <assert.h>
#include "ngtcp2_macro.h"
int ngtcp2_rob_gap_new(ngtcp2_rob_gap **pg, uint64_t begin, uint64_t end,
const ngtcp2_mem *mem) {
*pg = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_rob_gap));
if (*pg == NULL) {
return NGTCP2_ERR_NOMEM;
}
(*pg)->range.begin = begin;
(*pg)->range.end = end;
return 0;
}
void ngtcp2_rob_gap_del(ngtcp2_rob_gap *g, const ngtcp2_mem *mem) {
ngtcp2_mem_free(mem, g);
}
int ngtcp2_rob_data_new(ngtcp2_rob_data **pd, uint64_t offset, size_t chunk,
const ngtcp2_mem *mem) {
*pd = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_rob_data) + chunk);
if (*pd == NULL) {
return NGTCP2_ERR_NOMEM;
}
(*pd)->range.begin = offset;
(*pd)->range.end = offset + chunk;
(*pd)->begin = (uint8_t *)(*pd) + sizeof(ngtcp2_rob_data);
(*pd)->end = (*pd)->begin + chunk;
return 0;
}
void ngtcp2_rob_data_del(ngtcp2_rob_data *d, const ngtcp2_mem *mem) {
ngtcp2_mem_free(mem, d);
}
int ngtcp2_rob_init(ngtcp2_rob *rob, size_t chunk, const ngtcp2_mem *mem) {
int rv;
ngtcp2_rob_gap *g;
ngtcp2_ksl_init(&rob->gapksl, ngtcp2_ksl_range_compar, sizeof(ngtcp2_range),
mem);
rv = ngtcp2_rob_gap_new(&g, 0, UINT64_MAX, mem);
if (rv != 0) {
goto fail_rob_gap_new;
}
rv = ngtcp2_ksl_insert(&rob->gapksl, NULL, &g->range, g);
if (rv != 0) {
goto fail_gapksl_ksl_insert;
}
ngtcp2_ksl_init(&rob->dataksl, ngtcp2_ksl_range_compar, sizeof(ngtcp2_range),
mem);
rob->chunk = chunk;
rob->mem = mem;
return 0;
fail_gapksl_ksl_insert:
ngtcp2_rob_gap_del(g, mem);
fail_rob_gap_new:
ngtcp2_ksl_free(&rob->gapksl);
return rv;
}
void ngtcp2_rob_free(ngtcp2_rob *rob) {
ngtcp2_ksl_it it;
if (rob == NULL) {
return;
}
for (it = ngtcp2_ksl_begin(&rob->dataksl); !ngtcp2_ksl_it_end(&it);
ngtcp2_ksl_it_next(&it)) {
ngtcp2_rob_data_del(ngtcp2_ksl_it_get(&it), rob->mem);
}
for (it = ngtcp2_ksl_begin(&rob->gapksl); !ngtcp2_ksl_it_end(&it);
ngtcp2_ksl_it_next(&it)) {
ngtcp2_rob_gap_del(ngtcp2_ksl_it_get(&it), rob->mem);
}
ngtcp2_ksl_free(&rob->dataksl);
ngtcp2_ksl_free(&rob->gapksl);
}
static int rob_write_data(ngtcp2_rob *rob, uint64_t offset, const uint8_t *data,
size_t len) {
size_t n;
int rv;
ngtcp2_rob_data *d;
ngtcp2_range range = {offset, offset + len};
ngtcp2_ksl_it it;
for (it = ngtcp2_ksl_lower_bound_compar(&rob->dataksl, &range,
ngtcp2_ksl_range_exclusive_compar);
len; ngtcp2_ksl_it_next(&it)) {
if (ngtcp2_ksl_it_end(&it)) {
d = NULL;
} else {
d = ngtcp2_ksl_it_get(&it);
}
if (d == NULL || offset < d->range.begin) {
rv = ngtcp2_rob_data_new(&d, (offset / rob->chunk) * rob->chunk,
rob->chunk, rob->mem);
if (rv != 0) {
return rv;
}
rv = ngtcp2_ksl_insert(&rob->dataksl, &it, &d->range, d);
if (rv != 0) {
ngtcp2_rob_data_del(d, rob->mem);
return rv;
}
}
n = (size_t)ngtcp2_min((uint64_t)len, d->range.begin + rob->chunk - offset);
memcpy(d->begin + (offset - d->range.begin), data, n);
offset += n;
data += n;
len -= n;
}
return 0;
}
int ngtcp2_rob_push(ngtcp2_rob *rob, uint64_t offset, const uint8_t *data,
size_t datalen) {
int rv;
ngtcp2_rob_gap *g;
ngtcp2_range m, l, r, q = {offset, offset + datalen};
ngtcp2_ksl_it it;
it = ngtcp2_ksl_lower_bound_compar(&rob->gapksl, &q,
ngtcp2_ksl_range_exclusive_compar);
for (; !ngtcp2_ksl_it_end(&it);) {
g = ngtcp2_ksl_it_get(&it);
m = ngtcp2_range_intersect(&q, &g->range);
if (!ngtcp2_range_len(&m)) {
break;
}
if (ngtcp2_range_eq(&g->range, &m)) {
ngtcp2_ksl_remove_hint(&rob->gapksl, &it, &it, &g->range);
ngtcp2_rob_gap_del(g, rob->mem);
rv = rob_write_data(rob, m.begin, data + (m.begin - offset),
(size_t)ngtcp2_range_len(&m));
if (rv != 0) {
return rv;
}
continue;
}
ngtcp2_range_cut(&l, &r, &g->range, &m);
if (ngtcp2_range_len(&l)) {
ngtcp2_ksl_update_key(&rob->gapksl, &g->range, &l);
g->range = l;
if (ngtcp2_range_len(&r)) {
ngtcp2_rob_gap *ng;
rv = ngtcp2_rob_gap_new(&ng, r.begin, r.end, rob->mem);
if (rv != 0) {
return rv;
}
rv = ngtcp2_ksl_insert(&rob->gapksl, &it, &ng->range, ng);
if (rv != 0) {
ngtcp2_rob_gap_del(ng, rob->mem);
return rv;
}
}
} else if (ngtcp2_range_len(&r)) {
ngtcp2_ksl_update_key(&rob->gapksl, &g->range, &r);
g->range = r;
}
rv = rob_write_data(rob, m.begin, data + (m.begin - offset),
(size_t)ngtcp2_range_len(&m));
if (rv != 0) {
return rv;
}
ngtcp2_ksl_it_next(&it);
}
return 0;
}
void ngtcp2_rob_remove_prefix(ngtcp2_rob *rob, uint64_t offset) {
ngtcp2_rob_gap *g;
ngtcp2_rob_data *d;
ngtcp2_ksl_it it;
it = ngtcp2_ksl_begin(&rob->gapksl);
for (; !ngtcp2_ksl_it_end(&it);) {
g = ngtcp2_ksl_it_get(&it);
if (offset <= g->range.begin) {
break;
}
if (offset < g->range.end) {
ngtcp2_range r = {offset, g->range.end};
ngtcp2_ksl_update_key(&rob->gapksl, &g->range, &r);
g->range.begin = offset;
break;
}
ngtcp2_ksl_remove_hint(&rob->gapksl, &it, &it, &g->range);
ngtcp2_rob_gap_del(g, rob->mem);
}
it = ngtcp2_ksl_begin(&rob->dataksl);
for (; !ngtcp2_ksl_it_end(&it);) {
d = ngtcp2_ksl_it_get(&it);
if (offset < d->range.begin + rob->chunk) {
return;
}
ngtcp2_ksl_remove_hint(&rob->dataksl, &it, &it, &d->range);
ngtcp2_rob_data_del(d, rob->mem);
}
}
size_t ngtcp2_rob_data_at(ngtcp2_rob *rob, const uint8_t **pdest,
uint64_t offset) {
ngtcp2_rob_gap *g;
ngtcp2_rob_data *d;
ngtcp2_ksl_it it;
it = ngtcp2_ksl_begin(&rob->gapksl);
if (ngtcp2_ksl_it_end(&it)) {
return 0;
}
g = ngtcp2_ksl_it_get(&it);
if (g->range.begin <= offset) {
return 0;
}
it = ngtcp2_ksl_begin(&rob->dataksl);
d = ngtcp2_ksl_it_get(&it);
assert(d);
assert(d->range.begin <= offset);
assert(offset < d->range.begin + rob->chunk);
*pdest = d->begin + (offset - d->range.begin);
return (size_t)(ngtcp2_min(g->range.begin, d->range.begin + rob->chunk) -
offset);
}
void ngtcp2_rob_pop(ngtcp2_rob *rob, uint64_t offset, size_t len) {
ngtcp2_ksl_it it;
ngtcp2_rob_data *d;
it = ngtcp2_ksl_begin(&rob->dataksl);
d = ngtcp2_ksl_it_get(&it);
assert(d);
if (offset + len < d->range.begin + rob->chunk) {
return;
}
ngtcp2_ksl_remove_hint(&rob->dataksl, NULL, &it, &d->range);
ngtcp2_rob_data_del(d, rob->mem);
}
uint64_t ngtcp2_rob_first_gap_offset(ngtcp2_rob *rob) {
ngtcp2_ksl_it it = ngtcp2_ksl_begin(&rob->gapksl);
ngtcp2_rob_gap *g;
if (ngtcp2_ksl_it_end(&it)) {
return UINT64_MAX;
}
g = ngtcp2_ksl_it_get(&it);
return g->range.begin;
}
int ngtcp2_rob_data_buffered(ngtcp2_rob *rob) {
return ngtcp2_ksl_len(&rob->dataksl) != 0;
}
Zerion Mini Shell 1.0