contrib/apr-util/buckets/apr_buckets_heap.c

   1 /* Licensed to the Apache Software Foundation (ASF) under one or more
   2  * contributor license agreements.  See the NOTICE file distributed with
   3  * this work for additional information regarding copyright ownership.
   4  * The ASF licenses this file to You under the Apache License, Version 2.0
   5  * (the "License"); you may not use this file except in compliance with
   6  * the License.  You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "apr_buckets.h"
  18 #define APR_WANT_MEMFUNC
  19 #include "apr_want.h"
  20
  21 static apr_status_t heap_bucket_read(apr_bucket *b, const char **str,
  22                                      apr_size_t *len, apr_read_type_e block)
  23 {
  24     apr_bucket_heap *h = b->data;
  25
  26     *str = h->base + b->start;
  27     *len = b->length;
  28     return APR_SUCCESS;
  29 }
  30
  31 static void heap_bucket_destroy(void *data)
  32 {
  33     apr_bucket_heap *h = data;
  34
  35     if (apr_bucket_shared_destroy(h)) {
  36         (*h->free_func)(h->base);
  37         apr_bucket_free(h);
  38     }
  39 }
  40
  41 /* Warning: if you change this function, be sure to
  42  * change apr_bucket_pool_make() too! */
  43 APU_DECLARE(apr_bucket *) apr_bucket_heap_make(apr_bucket *b, const char *buf,
  44                                                apr_size_t length,
  45                                                void (*free_func)(void *data))
  46 {
  47     apr_bucket_heap *h;
  48
  49     h = apr_bucket_alloc(sizeof(*h), b->list);
  50
  51     if (!free_func) {
  52         h->alloc_len = length;
  53         h->base = apr_bucket_alloc(h->alloc_len, b->list);
  54         if (h->base == NULL) {
  55             apr_bucket_free(h);
  56             return NULL;
  57         }
  58         h->free_func = apr_bucket_free;
  59         memcpy(h->base, buf, length);
  60     }
  61     else {
  62         /* XXX: we lose the const qualifier here which indicates
  63          * there's something screwy with the API...
  64          */
  65         h->base = (char *) buf;
  66         h->alloc_len = length;
  67         h->free_func = free_func;
  68     }
  69
  70     b = apr_bucket_shared_make(b, h, 0, length);
  71     b->type = &apr_bucket_type_heap;
  72
  73     return b;
  74 }
  75
  76 APU_DECLARE(apr_bucket *) apr_bucket_heap_create(const char *buf,
  77                                                  apr_size_t length,
  78                                                  void (*free_func)(void *data),
  79                                                  apr_bucket_alloc_t *list)
  80 {
  81     apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
  82
  83     APR_BUCKET_INIT(b);
  84     b->free = apr_bucket_free;
  85     b->list = list;
  86     return apr_bucket_heap_make(b, buf, length, free_func);
  87 }
  88
  89 APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_heap = {
  90     "HEAP", 5, APR_BUCKET_DATA,
  91     heap_bucket_destroy,
  92     heap_bucket_read,
  93     apr_bucket_setaside_noop,
  94     apr_bucket_shared_split,
  95     apr_bucket_shared_copy
  96 };