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[SMS] implement GSM340_TP_VPF_ABSOLUTE 

- Added function "gsm340_scts" to decode the service center time stamp
  into a UTC/GMT timestamp
- in function gsm340_validity_period: can now decode validity period
  format absolute.
This commit is contained in:
Steffen Neubauer 2009-11-11 23:02:07 +09:00 committed by Harald Welte
parent d409be7fae
commit 5727cf4ea7
1 changed files with 50 additions and 3 deletions
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53
openbsc/src/gsm_04_11.c
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@ -216,10 +216,14 @@ static int gsm411_rp_sendmsg(struct msgb *msg, struct gsm_trans *trans,
return gsm411_cp_sendmsg(msg, trans, GSM411_MT_CP_DATA);
}
static time_t gsm340_scts(u_int8_t *scts);
static unsigned long gsm340_validity_period(u_int8_t sms_vpf, u_int8_t *sms_vp)
{
u_int8_t vp;
unsigned long minutes;
time_t expires;
time_t now;
switch (sms_vpf) {
case GSM340_TP_VPF_RELATIVE:
@ -236,8 +240,12 @@ static unsigned long gsm340_validity_period(u_int8_t sms_vpf, u_int8_t *sms_vp)
break;
case GSM340_TP_VPF_ABSOLUTE:
/* Chapter 9.2.3.12.2 */
/* FIXME: like service center time stamp */
DEBUGP(DSMS, "VPI absolute not implemented yet\n");
expires = gsm340_scts(sms_vp);
now = mktime(gmtime(NULL));
if (expires <= now)
minutes = 0;
else
minutes = (expires-now)/60;
break;
case GSM340_TP_VPF_ENHANCED:
/* Chapter 9.2.3.12.3 */
@ -317,6 +325,7 @@ static int gsm340_gen_oa(u_int8_t *oa, unsigned int oa_len,
return len_in_bytes;
}
/* Turn int into semi-octet representation: 98 => 0x89 */
static u_int8_t bcdify(u_int8_t value)
{
u_int8_t ret;
@ -327,6 +336,21 @@ static u_int8_t bcdify(u_int8_t value)
return ret;
}
/* Turn semi-octet representation into int: 0x89 => 98 */
static u_int8_t unbcdify(u_int8_t value)
{
u_int8_t ret;
if ((value & 0x0F) > 9 || (value >> 4) > 9)
DEBUGP(DSMS, "unbcdify got too big nibble: 0x%02X\n", value);
ret = (value&0x0F)*10;
if (ret > 90)
ret += value>>4;
return ret;
}
/* Generate 03.40 TP-SCTS */
static void gsm340_gen_scts(u_int8_t *scts, time_t time)
{
@ -338,7 +362,30 @@ static void gsm340_gen_scts(u_int8_t *scts, time_t time)
*scts++ = bcdify(tm->tm_hour);
*scts++ = bcdify(tm->tm_min);
*scts++ = bcdify(tm->tm_sec);
*scts++ = 0; /* FIXME: timezone */
*scts++ = bcdify(tm->tm_gmtoff/(60*15));
}
/* Decode 03.40 TP-SCTS (into utc/gmt timestamp) */
static time_t gsm340_scts(u_int8_t *scts)
{
struct tm tm;
u_int8_t yr = unbcdify(*scts++);
if (yr <= 80)
tm.tm_year = 100 + yr;
else
tm.tm_year = yr;
tm.tm_mon = unbcdify(*scts++) - 1;
tm.tm_mday = unbcdify(*scts++);
tm.tm_hour = unbcdify(*scts++);
tm.tm_min = unbcdify(*scts++);
tm.tm_sec = unbcdify(*scts++);
/* according to gsm 03.40 time zone is
"expressed in quarters of an hour" */
tm.tm_gmtoff = unbcdify(*scts++) * 15*60;
return mktime(&tm);
}
/* generate a msgb containing a TPDU derived from struct gsm_sms,