X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/82258709f6c66a06c4f09dc902128c2d1eb41389..556826b5d52152450259311c613695ee5adcac04:/client/jansson/hashtable.c

diff --git a/client/jansson/hashtable.c b/client/jansson/hashtable.c
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+/*
+ * Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#if HAVE_CONFIG_H
+#include <jansson_private_config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#if HAVE_STDINT_H
+#include <stdint.h>
+#endif
+
+#include <jansson_config.h>   /* for JSON_INLINE */
+#include "jansson_private.h"  /* for container_of() */
+#include "hashtable.h"
+
+#ifndef INITIAL_HASHTABLE_ORDER
+#define INITIAL_HASHTABLE_ORDER 3
+#endif
+
+typedef struct hashtable_list list_t;
+typedef struct hashtable_pair pair_t;
+typedef struct hashtable_bucket bucket_t;
+
+extern volatile uint32_t hashtable_seed;
+
+/* Implementation of the hash function */
+#include "lookup3.h"
+
+#define list_to_pair(list_)  container_of(list_, pair_t, list)
+#define ordered_list_to_pair(list_)  container_of(list_, pair_t, ordered_list)
+#define hash_str(key)        ((size_t)hashlittle((key), strlen(key), hashtable_seed))
+
+static JSON_INLINE void list_init(list_t *list)
+{
+    list->next = list;
+    list->prev = list;
+}
+
+static JSON_INLINE void list_insert(list_t *list, list_t *node)
+{
+    node->next = list;
+    node->prev = list->prev;
+    list->prev->next = node;
+    list->prev = node;
+}
+
+static JSON_INLINE void list_remove(list_t *list)
+{
+    list->prev->next = list->next;
+    list->next->prev = list->prev;
+}
+
+static JSON_INLINE int bucket_is_empty(hashtable_t *hashtable, bucket_t *bucket)
+{
+    return bucket->first == &hashtable->list && bucket->first == bucket->last;
+}
+
+static void insert_to_bucket(hashtable_t *hashtable, bucket_t *bucket,
+                             list_t *list)
+{
+    if(bucket_is_empty(hashtable, bucket))
+    {
+        list_insert(&hashtable->list, list);
+        bucket->first = bucket->last = list;
+    }
+    else
+    {
+        list_insert(bucket->first, list);
+        bucket->first = list;
+    }
+}
+
+static pair_t *hashtable_find_pair(hashtable_t *hashtable, bucket_t *bucket,
+                                   const char *key, size_t hash)
+{
+    list_t *list;
+    pair_t *pair;
+
+    if(bucket_is_empty(hashtable, bucket))
+        return NULL;
+
+    list = bucket->first;
+    while(1)
+    {
+        pair = list_to_pair(list);
+        if(pair->hash == hash && strcmp(pair->key, key) == 0)
+            return pair;
+
+        if(list == bucket->last)
+            break;
+
+        list = list->next;
+    }
+
+    return NULL;
+}
+
+/* returns 0 on success, -1 if key was not found */
+static int hashtable_do_del(hashtable_t *hashtable,
+                            const char *key, size_t hash)
+{
+    pair_t *pair;
+    bucket_t *bucket;
+    size_t index;
+
+    index = hash & hashmask(hashtable->order);
+    bucket = &hashtable->buckets[index];
+
+    pair = hashtable_find_pair(hashtable, bucket, key, hash);
+    if(!pair)
+        return -1;
+
+    if(&pair->list == bucket->first && &pair->list == bucket->last)
+        bucket->first = bucket->last = &hashtable->list;
+
+    else if(&pair->list == bucket->first)
+        bucket->first = pair->list.next;
+
+    else if(&pair->list == bucket->last)
+        bucket->last = pair->list.prev;
+
+    list_remove(&pair->list);
+    list_remove(&pair->ordered_list);
+    json_decref(pair->value);
+
+    jsonp_free(pair);
+    hashtable->size--;
+
+    return 0;
+}
+
+static void hashtable_do_clear(hashtable_t *hashtable)
+{
+    list_t *list, *next;
+    pair_t *pair;
+
+    for(list = hashtable->list.next; list != &hashtable->list; list = next)
+    {
+        next = list->next;
+        pair = list_to_pair(list);
+        json_decref(pair->value);
+        jsonp_free(pair);
+    }
+}
+
+static int hashtable_do_rehash(hashtable_t *hashtable)
+{
+    list_t *list, *next;
+    pair_t *pair;
+    size_t i, index, new_size, new_order;
+    struct hashtable_bucket *new_buckets;
+
+    new_order = hashtable->order + 1;
+    new_size = hashsize(new_order);
+
+    new_buckets = jsonp_malloc(new_size * sizeof(bucket_t));
+    if(!new_buckets)
+        return -1;
+
+    jsonp_free(hashtable->buckets);
+    hashtable->buckets = new_buckets;
+    hashtable->order = new_order;
+
+    for(i = 0; i < hashsize(hashtable->order); i++)
+    {
+        hashtable->buckets[i].first = hashtable->buckets[i].last =
+            &hashtable->list;
+    }
+
+    list = hashtable->list.next;
+    list_init(&hashtable->list);
+
+    for(; list != &hashtable->list; list = next) {
+        next = list->next;
+        pair = list_to_pair(list);
+        index = pair->hash % new_size;
+        insert_to_bucket(hashtable, &hashtable->buckets[index], &pair->list);
+    }
+
+    return 0;
+}
+
+
+int hashtable_init(hashtable_t *hashtable)
+{
+    size_t i;
+
+    hashtable->size = 0;
+    hashtable->order = INITIAL_HASHTABLE_ORDER;
+    hashtable->buckets = jsonp_malloc(hashsize(hashtable->order) * sizeof(bucket_t));
+    if(!hashtable->buckets)
+        return -1;
+
+    list_init(&hashtable->list);
+    list_init(&hashtable->ordered_list);
+
+    for(i = 0; i < hashsize(hashtable->order); i++)
+    {
+        hashtable->buckets[i].first = hashtable->buckets[i].last =
+            &hashtable->list;
+    }
+
+    return 0;
+}
+
+void hashtable_close(hashtable_t *hashtable)
+{
+    hashtable_do_clear(hashtable);
+    jsonp_free(hashtable->buckets);
+}
+
+int hashtable_set(hashtable_t *hashtable, const char *key, json_t *value)
+{
+    pair_t *pair;
+    bucket_t *bucket;
+    size_t hash, index;
+
+    /* rehash if the load ratio exceeds 1 */
+    if(hashtable->size >= hashsize(hashtable->order))
+        if(hashtable_do_rehash(hashtable))
+            return -1;
+
+    hash = hash_str(key);
+    index = hash & hashmask(hashtable->order);
+    bucket = &hashtable->buckets[index];
+    pair = hashtable_find_pair(hashtable, bucket, key, hash);
+
+    if(pair)
+    {
+        json_decref(pair->value);
+        pair->value = value;
+    }
+    else
+    {
+        /* offsetof(...) returns the size of pair_t without the last,
+           flexible member. This way, the correct amount is
+           allocated. */
+
+        size_t len = strlen(key);
+        if(len >= (size_t)-1 - offsetof(pair_t, key)) {
+            /* Avoid an overflow if the key is very long */
+            return -1;
+        }
+
+        pair = jsonp_malloc(offsetof(pair_t, key) + len + 1);
+        if(!pair)
+            return -1;
+
+        pair->hash = hash;
+        strncpy(pair->key, key, len + 1);
+        pair->value = value;
+        list_init(&pair->list);
+        list_init(&pair->ordered_list);
+
+        insert_to_bucket(hashtable, bucket, &pair->list);
+        list_insert(&hashtable->ordered_list, &pair->ordered_list);
+
+        hashtable->size++;
+    }
+    return 0;
+}
+
+void *hashtable_get(hashtable_t *hashtable, const char *key)
+{
+    pair_t *pair;
+    size_t hash;
+    bucket_t *bucket;
+
+    hash = hash_str(key);
+    bucket = &hashtable->buckets[hash & hashmask(hashtable->order)];
+
+    pair = hashtable_find_pair(hashtable, bucket, key, hash);
+    if(!pair)
+        return NULL;
+
+    return pair->value;
+}
+
+int hashtable_del(hashtable_t *hashtable, const char *key)
+{
+    size_t hash = hash_str(key);
+    return hashtable_do_del(hashtable, key, hash);
+}
+
+void hashtable_clear(hashtable_t *hashtable)
+{
+    size_t i;
+
+    hashtable_do_clear(hashtable);
+
+    for(i = 0; i < hashsize(hashtable->order); i++)
+    {
+        hashtable->buckets[i].first = hashtable->buckets[i].last =
+            &hashtable->list;
+    }
+
+    list_init(&hashtable->list);
+    list_init(&hashtable->ordered_list);
+    hashtable->size = 0;
+}
+
+void *hashtable_iter(hashtable_t *hashtable)
+{
+    return hashtable_iter_next(hashtable, &hashtable->ordered_list);
+}
+
+void *hashtable_iter_at(hashtable_t *hashtable, const char *key)
+{
+    pair_t *pair;
+    size_t hash;
+    bucket_t *bucket;
+
+    hash = hash_str(key);
+    bucket = &hashtable->buckets[hash & hashmask(hashtable->order)];
+
+    pair = hashtable_find_pair(hashtable, bucket, key, hash);
+    if(!pair)
+        return NULL;
+
+    return &pair->ordered_list;
+}
+
+void *hashtable_iter_next(hashtable_t *hashtable, void *iter)
+{
+    list_t *list = (list_t *)iter;
+    if(list->next == &hashtable->ordered_list)
+        return NULL;
+    return list->next;
+}
+
+void *hashtable_iter_key(void *iter)
+{
+    pair_t *pair = ordered_list_to_pair((list_t *)iter);
+    return pair->key;
+}
+
+void *hashtable_iter_value(void *iter)
+{
+    pair_t *pair = ordered_list_to_pair((list_t *)iter);
+    return pair->value;
+}
+
+void hashtable_iter_set(void *iter, json_t *value)
+{
+    pair_t *pair = ordered_list_to_pair((list_t *)iter);
+
+    json_decref(pair->value);
+    pair->value = value;
+}