1 files changed, 189 insertions, 0 deletions
diff --git a/Utilities/cmnghttp2/lib/nghttp2_map.c b/Utilities/cmnghttp2/lib/nghttp2_map.c
new file mode 100644
index 0000000000..4d9f97b47e
--- /dev/null
+++ b/Utilities/cmnghttp2/lib/nghttp2_map.c
@@ -0,0 +1,189 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * 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>
+
+#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_entry *));
+  if (map->table == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  map->size = 0;
+
+  return 0;
+}
+
+void nghttp2_map_free(nghttp2_map *map) {
+  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;
+  for (i = 0; i < map->tablelen; ++i) {
+    nghttp2_map_entry *entry;
+    for (entry = map->table[i]; entry;) {
+      nghttp2_map_entry *next = entry->next;
+      func(entry, ptr);
+      entry = next;
+    }
+    map->table[i] = NULL;
+  }
+}
+
+int nghttp2_map_each(nghttp2_map *map,
+                     int (*func)(nghttp2_map_entry *entry, void *ptr),
+                     void *ptr) {
+  int rv;
+  uint32_t i;
+  for (i = 0; i < map->tablelen; ++i) {
+    nghttp2_map_entry *entry;
+    for (entry = map->table[i]; entry; entry = entry->next) {
+      rv = func(entry, 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;
+}
+
+/* Same hash function in android HashMap source code. */
+/* The |mod| must be power of 2 */
+static uint32_t hash(int32_t key, uint32_t mod) {
+  uint32_t h = (uint32_t)key;
+  h ^= (h >> 20) ^ (h >> 12);
+  h ^= (h >> 7) ^ (h >> 4);
+  return h & (mod - 1);
+}
+
+static int insert(nghttp2_map_entry **table, uint32_t tablelen,
+                  nghttp2_map_entry *entry) {
+  uint32_t h = hash(entry->key, tablelen);
+  if (table[h] == NULL) {
+    table[h] = entry;
+  } else {
+    nghttp2_map_entry *p;
+    /* We won't allow duplicated key, so check it out. */
+    for (p = table[h]; p; p = p->next) {
+      if (p->key == entry->key) {
+        return NGHTTP2_ERR_INVALID_ARGUMENT;
+      }
+    }
+    entry->next = table[h];
+    table[h] = entry;
+  }
+  return 0;
+}
+
+/* new_tablelen must be power of 2 */
+static int resize(nghttp2_map *map, uint32_t new_tablelen) {
+  uint32_t i;
+  nghttp2_map_entry **new_table;
+
+  new_table =
+      nghttp2_mem_calloc(map->mem, new_tablelen, sizeof(nghttp2_map_entry *));
+  if (new_table == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    nghttp2_map_entry *entry;
+    for (entry = map->table[i]; entry;) {
+      nghttp2_map_entry *next = entry->next;
+      entry->next = NULL;
+      /* This function must succeed */
+      insert(new_table, new_tablelen, entry);
+      entry = next;
+    }
+  }
+  nghttp2_mem_free(map->mem, map->table);
+  map->tablelen = new_tablelen;
+  map->table = new_table;
+
+  return 0;
+}
+
+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 = resize(map, map->tablelen * 2);
+    if (rv != 0) {
+      return rv;
+    }
+  }
+  rv = insert(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) {
+  uint32_t h;
+  nghttp2_map_entry *entry;
+  h = hash(key, map->tablelen);
+  for (entry = map->table[h]; entry; entry = entry->next) {
+    if (entry->key == key) {
+      return entry;
+    }
+  }
+  return NULL;
+}
+
+int nghttp2_map_remove(nghttp2_map *map, key_type key) {
+  uint32_t h;
+  nghttp2_map_entry **dst;
+
+  h = hash(key, map->tablelen);
+
+  for (dst = &map->table[h]; *dst; dst = &(*dst)->next) {
+    if ((*dst)->key != key) {
+      continue;
+    }
+
+    *dst = (*dst)->next;
+    --map->size;
+    return 0;
+  }
+  return NGHTTP2_ERR_INVALID_ARGUMENT;
+}
+
+size_t nghttp2_map_size(nghttp2_map *map) { return map->size; }