tor-android/external/badvpn_dns/ncd/extra/NCDBuf.c

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2015-01-25 11:08:34 +00:00
/**
* @file NCDBuf.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "NCDBuf.h"
#include <misc/balloc.h>
#include <misc/offset.h>
#include <misc/debug.h>
static void ref_target_func_release (BRefTarget *ref_target)
{
NCDBuf *o = UPPER_OBJECT(ref_target, NCDBuf, ref_target);
NCDBufStore *store = o->store;
if (store) {
LinkedList0_Remove(&store->used_bufs_list, &o->list_node);
LinkedList0_Prepend(&store->free_bufs_list, &o->list_node);
} else {
BFree(o);
}
}
void NCDBufStore_Init (NCDBufStore *o, size_t buf_size)
{
o->buf_size = buf_size;
LinkedList0_Init(&o->used_bufs_list);
LinkedList0_Init(&o->free_bufs_list);
DebugObject_Init(&o->d_obj);
}
void NCDBufStore_Free (NCDBufStore *o)
{
DebugObject_Free(&o->d_obj);
LinkedList0Node *ln;
ln = LinkedList0_GetFirst(&o->used_bufs_list);
while (ln) {
NCDBuf *buf = UPPER_OBJECT(ln, NCDBuf, list_node);
ASSERT(buf->store == o)
buf->store = NULL;
ln = LinkedList0Node_Next(ln);
}
ln = LinkedList0_GetFirst(&o->free_bufs_list);
while (ln) {
LinkedList0Node *next_ln = LinkedList0Node_Next(ln);
NCDBuf *buf = UPPER_OBJECT(ln, NCDBuf, list_node);
ASSERT(buf->store == o)
BFree(buf);
ln = next_ln;
}
}
size_t NCDBufStore_BufSize (NCDBufStore *o)
{
DebugObject_Access(&o->d_obj);
return o->buf_size;
}
NCDBuf * NCDBufStore_GetBuf (NCDBufStore *o)
{
DebugObject_Access(&o->d_obj);
NCDBuf *buf;
LinkedList0Node *ln = LinkedList0_GetFirst(&o->free_bufs_list);
if (ln) {
buf = UPPER_OBJECT(ln, NCDBuf, list_node);
ASSERT(buf->store == o)
LinkedList0_Remove(&o->free_bufs_list, &buf->list_node);
} else {
bsize_t size = bsize_add(bsize_fromsize(sizeof(NCDBuf)), bsize_fromsize(o->buf_size));
buf = BAllocSize(size);
if (!buf) {
return NULL;
}
buf->store = o;
}
LinkedList0_Prepend(&o->used_bufs_list, &buf->list_node);
BRefTarget_Init(&buf->ref_target, ref_target_func_release);
return buf;
}
BRefTarget * NCDBuf_RefTarget (NCDBuf *o)
{
return &o->ref_target;
}
char * NCDBuf_Data (NCDBuf *o)
{
return o->data;
}