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/* bitvector.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*! \addtogroup bitvector
* @{
*/
/*! \file bitvector.cpp
* \brief Additional functions for Osmocom bit vector abstraction.
*/
#include <bitvector.h>
extern "C" {
#include <osmocom/core/talloc.h>
}
void *bv_tall_ctx;
struct bitvec *bitvec_alloc(unsigned size)
{
struct bitvec *bv = talloc_zero(bv_tall_ctx, struct bitvec);
bv->data_len = size;
bv->cur_bit = 0;
bv->data = talloc_zero_array(bv_tall_ctx, uint8_t, size);
return bv;
}
void bitvec_free(struct bitvec *bv)
{
talloc_free(bv->data);
talloc_free(bv);
}
unsigned int bitvec_pack(struct bitvec *bv, uint8_t *buffer)
{
unsigned int i = 0;
for (i = 0; i < bv->data_len; i++)
{
buffer[i] = bv->data[i];
}
return i;
}
unsigned int bitvec_unpack(struct bitvec *bv, uint8_t *buffer)
{
unsigned int i = 0;
for (i = 0; i < bv->data_len; i++)
{
bv->data[i] = buffer[i];
}
return i;
}
int bitvec_unhex(struct bitvec *bv, const char* src)
{
unsigned val;
unsigned write_index = 0;
unsigned digits = bv->data_len*2;
for (unsigned i=0; i<digits; i++) {
if (sscanf(src+i, "%1x", &val) < 1) {
return 1;
}
bitvec_write_field(bv, write_index,val, 4);
}
return 0;
}
uint64_t bitvec_read_field(struct bitvec *bv, unsigned& read_index, unsigned len)
{
unsigned int i;
uint64_t ui = 0;
bv->cur_bit = read_index;
for (i = 0; i < len; i++) {
int bit = bitvec_get_bit_pos((const struct bitvec *)bv, bv->cur_bit);
if (bit < 0)
return bit;
if (bit)
ui |= ((uint64_t)1 << (len - i - 1));
bv->cur_bit++;
}
read_index += len;
return ui;
}
int bitvec_write_field_lh(struct bitvec *bv, unsigned& write_index,
uint64_t val, unsigned len)
{
unsigned int i;
int rc;
bv->cur_bit = write_index;
for (i = 0; i < len; i++) {
bit_value bit = L;
if (val & ((uint64_t)1 << (len - i - 1)))
bit = H;
rc = bitvec_set_bit(bv, bit);
if (rc)
return rc;
}
write_index += len;
return 0;
}
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