2011-01-19 09:10:16 +00:00
|
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
|
2011-03-22 15:36:13 +00:00
|
|
|
#include <osmocom/core/bits.h>
|
2011-01-19 09:10:16 +00:00
|
|
|
|
|
|
|
/* convert unpacked bits to packed bits, return length in bytes */
|
|
|
|
int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
uint8_t curbyte = 0;
|
|
|
|
pbit_t *outptr = out;
|
|
|
|
|
|
|
|
for (i = 0; i < num_bits; i++) {
|
|
|
|
uint8_t bitnum = 7 - (i % 8);
|
|
|
|
|
|
|
|
curbyte |= (in[i] << bitnum);
|
|
|
|
|
2011-01-22 21:48:37 +00:00
|
|
|
if(i % 8 == 7){
|
2011-01-19 09:10:16 +00:00
|
|
|
*outptr++ = curbyte;
|
|
|
|
curbyte = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* we have a non-modulo-8 bitcount */
|
|
|
|
if (i % 8)
|
|
|
|
*outptr++ = curbyte;
|
|
|
|
|
|
|
|
return outptr - out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* convert packed bits to unpacked bits, return length in bytes */
|
|
|
|
int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
ubit_t *cur = out;
|
|
|
|
ubit_t *limit = out + num_bits;
|
|
|
|
|
|
|
|
for (i = 0; i < (num_bits/8)+1; i++) {
|
|
|
|
pbit_t byte = in[i];
|
|
|
|
*cur++ = (byte >> 7) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 6) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 5) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 4) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 3) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 2) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 1) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
*cur++ = (byte >> 0) & 1;
|
|
|
|
if (cur >= limit)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return cur - out;
|
|
|
|
}
|
2011-01-21 11:22:30 +00:00
|
|
|
|
|
|
|
/* convert unpacked bits to packed bits (extended options but slower),
|
|
|
|
* return length in bytes (max written ofs of output buffer + 1) */
|
|
|
|
int osmo_ubit2pbit_ext(pbit_t *out, unsigned int out_ofs,
|
|
|
|
const ubit_t *in, unsigned int in_ofs,
|
|
|
|
unsigned int num_bits, int lsb_mode)
|
|
|
|
{
|
|
|
|
int i, op, bn;
|
|
|
|
for (i=0; i<num_bits; i++) {
|
|
|
|
op = out_ofs + i;
|
|
|
|
bn = lsb_mode ? (op&7) : (7-(op&7));
|
|
|
|
if (in[in_ofs+i])
|
|
|
|
out[op>>3] |= 1 << bn;
|
|
|
|
else
|
|
|
|
out[op>>3] &= ~(1 << bn);
|
|
|
|
}
|
|
|
|
return ((out_ofs + num_bits - 1) >> 3) + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* convert packed bits to unpacked bits (extended options but slower),
|
|
|
|
* return length in bytes (max written ofs of output buffer + 1) */
|
|
|
|
int osmo_pbit2ubit_ext(ubit_t *out, unsigned int out_ofs,
|
|
|
|
const pbit_t *in, unsigned int in_ofs,
|
|
|
|
unsigned int num_bits, int lsb_mode)
|
|
|
|
{
|
|
|
|
int i, ip, bn;
|
|
|
|
for (i=0; i<num_bits; i++) {
|
|
|
|
ip = in_ofs + i;
|
|
|
|
bn = lsb_mode ? (ip&7) : (7-(ip&7));
|
|
|
|
out[out_ofs+i] = !!(in[ip>>3] & (1<<bn));
|
|
|
|
}
|
|
|
|
return out_ofs + num_bits;
|
|
|
|
}
|