cellular-infrastructure
/
osmo-mgw
mirror of https://gerrit.osmocom.org/osmo-mgw
10
0
Fork 0
Code Issues Releases Wiki Activity

[utils] Commit not working 7bit encoder... 

No one is using it so far, so no one gets hurt...
This commit is contained in:
Holger Freyther 2009-02-17 23:42:45 +00:00
parent 62f47773ae
commit ce66896d1d
1 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/gsm_utils.c
View File

@ -22,7 +22,9 @@
#include <openbsc/gsm_utils.h>
#include <malloc.h>
#include <string.h>
/* GSM 03.38 6.2.1 Charachter packing */
char *gsm_7bit_decode(u_int8_t *user_data, u_int8_t length)
{
u_int8_t d_off = 0, b_off = 0;
@ -40,3 +42,30 @@ char *gsm_7bit_decode(u_int8_t *user_data, u_int8_t length)
text[i] = '\0';
return text;
}
/* GSM 03.38 6.2.1 Charachter packing */
u_int8_t *gsm_7bit_encode(char *data)
{
int i;
u_int8_t d_off = 0, b_off = 0;
const int length = strlen(data);
char *result = malloc(length + 1);
memset(result, 0, length + 1);
for (i = 0; i < length; ++i) {
u_int8_t first = (data[i] & 0x7f) << b_off;
u_int8_t second = (data[i] & 0x7f) >> (7 - b_off);
result[d_off] |= first;
result[d_off + 1] = second;
b_off += 7;
if (b_off >= 8) {
d_off += 1;
b_off -= 8;
}
}
return result;
}