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nghttp2/lib/nghttp2_map.c

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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2012 nghttp2 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 "nghttp2_map.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "nghttp2_helper.h"
+
+#define INITIAL_TABLE_LENGTH 256
+
+int nghttp2_map_init(nghttp2_map *map, nghttp2_mem *mem) {
+  map->mem = mem;
+  map->tablelen = INITIAL_TABLE_LENGTH;
+  map->table =
+      nghttp2_mem_calloc(mem, map->tablelen, sizeof(nghttp2_map_bucket));
+  if (map->table == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  map->size = 0;
+
+  return 0;
+}
+
+void nghttp2_map_free(nghttp2_map *map) {
+  size_t i;
+  nghttp2_map_bucket *bkt;
+
+  if (!map) {
+    return;
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+    }
+  }
+
+  nghttp2_mem_free(map->mem, map->table);
+}
+
+void nghttp2_map_each_free(nghttp2_map *map,
+                           int (*func)(nghttp2_map_entry *entry, void *ptr),
+                           void *ptr) {
+  uint32_t i;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      func(bkt->ptr, ptr);
+      bkt->ptr = NULL;
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        func(nghttp2_ksl_it_get(&it), ptr);
+      }
+
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+      bkt->ksl = NULL;
+    }
+  }
+}
+
+int nghttp2_map_each(nghttp2_map *map,
+                     int (*func)(nghttp2_map_entry *entry, void *ptr),
+                     void *ptr) {
+  int rv;
+  uint32_t i;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      rv = func(bkt->ptr, ptr);
+      if (rv != 0) {
+        return rv;
+      }
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        rv = func(nghttp2_ksl_it_get(&it), ptr);
+        if (rv != 0) {
+          return rv;
+        }
+      }
+    }
+  }
+  return 0;
+}
+
+void nghttp2_map_entry_init(nghttp2_map_entry *entry, key_type key) {
+  entry->key = key;
+  entry->next = NULL;
+}
+
+/* FNV1a hash */
+static uint32_t hash(key_type key, uint32_t mod) {
+  uint8_t *p, *end;
+  uint32_t h = 0x811C9DC5u;
+
+  p = (uint8_t *)&key;
+  end = p + sizeof(key_type);
+
+  for (; p != end;) {
+    h ^= *p++;
+    h += (h << 1) + (h << 4) + (h << 7) + (h << 8) + (h << 24);
+  }
+
+  return h & (mod - 1);
+}
+
+static int less(const nghttp2_ksl_key *lhs, const nghttp2_ksl_key *rhs) {
+  return *(key_type *)lhs < *(key_type *)rhs;
+}
+
+static int map_insert(nghttp2_map *map, nghttp2_map_bucket *table,
+                      uint32_t tablelen, nghttp2_map_entry *entry) {
+  uint32_t h = hash(entry->key, tablelen);
+  nghttp2_map_bucket *bkt = &table[h];
+  nghttp2_mem *mem = map->mem;
+  int rv;
+
+  if (bkt->ptr == NULL &&
+      (bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0)) {
+    bkt->ptr = entry;
+    return 0;
+  }
+
+  if (!bkt->ksl) {
+    bkt->ksl = nghttp2_mem_malloc(mem, sizeof(*bkt->ksl));
+    if (bkt->ksl == NULL) {
+      return NGHTTP2_ERR_NOMEM;
+    }
+    nghttp2_ksl_init(bkt->ksl, less, sizeof(key_type), mem);
+  }
+
+  if (bkt->ptr) {
+    rv = nghttp2_ksl_insert(bkt->ksl, NULL, &bkt->ptr->key, bkt->ptr);
+    if (rv != 0) {
+      return rv;
+    }
+
+    bkt->ptr = NULL;
+  }
+
+  return nghttp2_ksl_insert(bkt->ksl, NULL, &entry->key, entry);
+}
+
+/* new_tablelen must be power of 2 */
+static int map_resize(nghttp2_map *map, uint32_t new_tablelen) {
+  uint32_t i;
+  nghttp2_map_bucket *new_table;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+  int rv;
+
+  new_table =
+      nghttp2_mem_calloc(map->mem, new_tablelen, sizeof(nghttp2_map_bucket));
+  if (new_table == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      rv = map_insert(map, new_table, new_tablelen, bkt->ptr);
+      if (rv != 0) {
+        goto fail;
+      }
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        rv = map_insert(map, new_table, new_tablelen, nghttp2_ksl_it_get(&it));
+        if (rv != 0) {
+          goto fail;
+        }
+      }
+    }
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+    }
+  }
+
+  nghttp2_mem_free(map->mem, map->table);
+  map->tablelen = new_tablelen;
+  map->table = new_table;
+
+  return 0;
+
+fail:
+  for (i = 0; i < new_tablelen; ++i) {
+    bkt = &new_table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+    }
+  }
+
+  return rv;
+}
+
+int nghttp2_map_insert(nghttp2_map *map, nghttp2_map_entry *new_entry) {
+  int rv;
+
+  /* Load factor is 0.75 */
+  if ((map->size + 1) * 4 > map->tablelen * 3) {
+    rv = map_resize(map, map->tablelen * 2);
+    if (rv != 0) {
+      return rv;
+    }
+  }
+  rv = map_insert(map, map->table, map->tablelen, new_entry);
+  if (rv != 0) {
+    return rv;
+  }
+  ++map->size;
+  return 0;
+}
+
+nghttp2_map_entry *nghttp2_map_find(nghttp2_map *map, key_type key) {
+  nghttp2_map_bucket *bkt = &map->table[hash(key, map->tablelen)];
+  nghttp2_ksl_it it;
+
+  if (bkt->ptr) {
+    if (bkt->ptr->key == key) {
+      return bkt->ptr;
+    }
+    return NULL;
+  }
+
+  if (bkt->ksl) {
+    it = nghttp2_ksl_lower_bound(bkt->ksl, &key);
+    if (nghttp2_ksl_it_end(&it) ||
+        *(key_type *)nghttp2_ksl_it_key(&it) != key) {
+      return NULL;
+    }
+    return nghttp2_ksl_it_get(&it);
+  }
+
+  return NULL;
+}
+
+int nghttp2_map_remove(nghttp2_map *map, key_type key) {
+  nghttp2_map_bucket *bkt = &map->table[hash(key, map->tablelen)];
+  int rv;
+
+  if (bkt->ptr) {
+    if (bkt->ptr->key == key) {
+      bkt->ptr = NULL;
+      --map->size;
+      return 0;
+    }
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (bkt->ksl) {
+    rv = nghttp2_ksl_remove(bkt->ksl, NULL, &key);
+    if (rv != 0) {
+      return rv;
+    }
+    --map->size;
+    return 0;
+  }
+
+  return NGHTTP2_ERR_INVALID_ARGUMENT;
+}
+
+void nghttp2_map_clear(nghttp2_map *map) {
+  uint32_t i;
+  nghttp2_map_bucket *bkt;
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    bkt->ptr = NULL;
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+      bkt->ksl = NULL;
+    }
+  }
+
+  map->size = 0;
+}
+
+size_t nghttp2_map_size(nghttp2_map *map) { return map->size; }