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/* GMR-1 interleaving */
/* See GMR-1 05.003 (ETSI TS 101 376-5-3 V1.2.1) - Section 4.8 */
/* (C) 2011-2016 by Sylvain Munaut <tnt@246tNt.com>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*! \addtogroup interleave
* @{
*/
/*! \file l1/interleave.c
* \brief Osmocom GMR-1 interleaving implementation
*/
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <osmocom/core/bits.h>
#include <osmocom/gmr1/l1/interleave.h>
/*! \brief GMR-1 intra burst inteleaver
* \param[out] out Interleaved bit array to write to
* \param[in] in Original bit array to read from
* \param[in] N Dimension of the interleaving matrix
*
* Both arrays need to have a length of (8*N).
* This routine works for any type that has the same size as uint8_t like
* sbit_t or ubit_t.
*/
void
gmr1_interleave_intra(void *out, const void *in, int N)
{
const uint8_t *inb = (uint8_t *)in;
uint8_t *outb = (uint8_t *)out;
int len = N << 3;
int kc, kep, i, j;
for (kc=0; kc<len; kc++) {
i = kc >> 3;
j = (5 * kc) & 7;
kep = N * j + i;
outb[kep] = inb[kc];
}
}
/*! \brief GMR-1 intra burst de-interleaver
* \param[out] out Deinterleaved bit array to write to
* \param[in] in Interleaved bit array to read from
* \param[in] N Dimension of the interleaving matrix
*
* Both arrays need to have a length of (8*N).
* This routine works for any type that has the same size as uint8_t like
* sbit_t or ubit_t.
*/
void
gmr1_deinterleave_intra(void *out, const void *in, int N)
{
const uint8_t *inb = (uint8_t *)in;
uint8_t *outb = (uint8_t *)out;
int len = N << 3;
int kc, kep, i, j;
for (kc=0; kc<len; kc++) {
i = kc >> 3;
j = (5 * kc) & 7;
kep = N * j + i;
outb[kc] = inb[kep];
}
}
/*! \brief GMR-1 inter burst interleaver initializer
* \param[in] il The interleaver object to init
* \param[in] N The interleaving depth
* \param[in] K The interleaving width
*/
int
gmr1_interleaver_init(struct gmr1_interleaver *il, int N, int K)
{
int l;
uint8_t *b;
memset(il, 0x00, sizeof(struct gmr1_interleaver));
l = N * K * sizeof(uint8_t);
b = malloc(l);
if (!b)
return -ENOMEM;
memset(b, 0x00, l);
il->N = N;
il->K = K;
il->bits_cpp = b;
return 0;
}
/*! \brief GMR-1 inter burst interleaver cleanup
* \param[in] il The interleaver object to release
*/
void
gmr1_interleaver_fini(struct gmr1_interleaver *il)
{
free(il->bits_cpp);
memset(il, 0x00, sizeof(struct gmr1_interleaver));
}
/*! \brief GMR-1 inter burst interleaver
* \param[in] il The interleaver object
* \param[out] bits_epp N bits output of interleaver
* \param[in] bits_ep N bits input to interleaver
*
* bits_ep and bits_epp can be equal for inplace processing
*/
void
gmr1_interleave_inter(struct gmr1_interleaver *il,
void *bits_epp, void *bits_ep)
{
int i, jk;
uint8_t *d, *s;
/* Copy ep to cpp */
i = il->n % il->N;
d = &il->bits_cpp[i * il->K];
memcpy(d, bits_ep, il->K * sizeof(uint8_t));
/* Copy cpp to epp */
d = bits_epp;
s = il->bits_cpp;
for (jk=0; jk<il->K; jk++) {
i = ((il->n % il->N) - (jk % il->N) + il->N) % il->N;
d[jk] = s[(i * il->K) + jk];
}
/* Next burst */
il->n++;
}
/*! \brief GMR-1 inter burst de-interleaver
* \param[in] il The interleaver object
* \param[out] bits_ep N bits output from de-interleaver
* \param[in] bits_epp N bits input to de-interleaver
*
* bits_ep and bits_epp can be equal for inplace processing
*/
void
gmr1_deinterleave_inter(struct gmr1_interleaver *il,
void *bits_ep, void *bits_epp)
{
int i, jk;
uint8_t *d, *s;
/* Copy epp to cpp */
s = bits_epp;
d = il->bits_cpp;
for (jk=0; jk<il->K; jk++) {
i = ((il->n % il->N) - (jk % il->N) + il->N) % il->N;
d[(i * il->K) + jk] = s[jk];
}
/* Copy cpp to ep */
i = (il->n + 1) % il->N;
s = &il->bits_cpp[i * il->K];
memcpy(bits_ep, s, il->K * sizeof(uint8_t));
/* Next burst */
il->n++;
}
/*! @} */
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