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-rw-r--r--lib/ngtcp2_rob.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/lib/ngtcp2_rob.c b/lib/ngtcp2_rob.c
new file mode 100644
index 0000000..9c3d75d
--- /dev/null
+++ b/lib/ngtcp2_rob.c
@@ -0,0 +1,319 @@
+/*
+ * 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;
+}
+
+int 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 0;
+ }
+ ngtcp2_ksl_remove_hint(&rob->dataksl, &it, &it, &d->range);
+ ngtcp2_rob_data_del(d, rob->mem);
+ }
+
+ return 0;
+}
+
+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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 05:40:46 +0000