tor-android/external/badvpn_dns/ncd/NCDPlaceholderDb.c

128 lines
3.9 KiB
C

/**
* @file NCDPlaceholderDb.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 <string.h>
#include <limits.h>
#include <stdlib.h>
#include <misc/balloc.h>
#include <misc/strdup.h>
#include <base/BLog.h>
#include <ncd/make_name_indices.h>
#include "NCDPlaceholderDb.h"
#include <generated/blog_channel_NCDPlaceholderDb.h>
int NCDPlaceholderDb_Init (NCDPlaceholderDb *o, NCDStringIndex *string_index)
{
ASSERT(string_index)
o->count = 0;
o->capacity = 1;
o->string_index = string_index;
if (!(o->arr = BAllocArray(o->capacity, sizeof(o->arr[0])))) {
BLog(BLOG_ERROR, "NCDPlaceholderDb_Init failed");
return 0;
}
return 1;
}
void NCDPlaceholderDb_Free (NCDPlaceholderDb *o)
{
for (size_t i = 0; i < o->count; i++) {
BFree(o->arr[i].varnames);
}
BFree(o->arr);
}
int NCDPlaceholderDb_AddVariable (NCDPlaceholderDb *o, const char *varname, int *out_plid)
{
ASSERT(varname)
ASSERT(out_plid)
ASSERT(o->count <= o->capacity)
ASSERT(o->capacity > 0)
if (o->count == o->capacity) {
if (o->capacity > SIZE_MAX / 2) {
BLog(BLOG_ERROR, "too many placeholder entries (cannot resize)");
return 0;
}
size_t newcap = 2 * o->capacity;
struct NCDPlaceholderDb__entry *newarr = BAllocArray(newcap, sizeof(newarr[0]));
if (!newarr) {
BLog(BLOG_ERROR, "BAllocArray failed");
return 0;
}
memcpy(newarr, o->arr, o->count * sizeof(newarr[0]));
BFree(o->arr);
o->arr = newarr;
o->capacity = newcap;
}
ASSERT(o->count < o->capacity)
if (o->count > INT_MAX) {
BLog(BLOG_ERROR, "too many placeholder entries (cannot fit integer)");
return 0;
}
NCD_string_id_t *varnames;
size_t num_names;
if (!ncd_make_name_indices(o->string_index, varname, &varnames, &num_names)) {
BLog(BLOG_ERROR, "ncd_make_name_indices failed");
return 0;
}
*out_plid = o->count;
o->arr[o->count].varnames = varnames;
o->arr[o->count].num_names = num_names;
o->count++;
return 1;
}
void NCDPlaceholderDb_GetVariable (NCDPlaceholderDb *o, int plid, const NCD_string_id_t **out_varnames, size_t *out_num_names)
{
ASSERT(plid >= 0)
ASSERT(plid < o->count)
ASSERT(out_varnames)
ASSERT(out_num_names)
*out_varnames = o->arr[plid].varnames;
*out_num_names = o->arr[plid].num_names;
}