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ofono
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Add Cell Broadcast encoding / decoding utilities

This commit is contained in:
Denis Kenzior 2009-06-30 17:35:56 -05:00
parent 97d53bf0ec
commit b1602d49e5
2 changed files with 66 additions and 0 deletions
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45
src/smsutil.c
View File

@ -2484,3 +2484,48 @@ gboolean cbs_dcs_decode(guint8 dcs, gboolean *udhi, enum sms_class *cls,
return TRUE;
}
gboolean cbs_decode(const unsigned char *pdu, int len, struct cbs *out)
{
/* CBS is always a fixed length of 88 bytes */
if (len != 88)
return FALSE;
out->gs = (enum cbs_geo_scope) ((pdu[0] >> 6) & 0x03);
out->message_code = ((pdu[0] & 0x3f) << 4) | ((pdu[1] >> 4) & 0xf);
out->update_number = (pdu[1] & 0xf);
out->message_identifier = (pdu[2] << 8) | pdu[3];
out->dcs = pdu[4];
out->max_pages = pdu[5] & 0xf;
out->page = (pdu[5] >> 4) & 0xf;
/* If a mobile receives the code 0000 in either the first field or
* the second field then it shall treat the CBS message exactly the
* same as a CBS message with page parameter 0001 0001 (i.e. a single
* page message).
*/
if (out->max_pages == 0 || out->page == 0) {
out->max_pages = 1;
out->page = 1;
}
memcpy(out->ud, pdu + 6, 82);
return TRUE;
}
gboolean cbs_encode(const struct cbs *cbs, int *len, unsigned char *pdu)
{
pdu[0] = (cbs->gs << 6) | ((cbs->message_code >> 4) & 0x3f);
pdu[1] = ((cbs->message_code & 0xf) << 4) | cbs->update_number;
pdu[2] = cbs->message_identifier >> 8;
pdu[3] = cbs->message_identifier & 0xff;
pdu[4] = cbs->dcs;
pdu[5] = cbs->max_pages | (cbs->page << 4);
memcpy(pdu + 6, cbs->ud, 82);
if (len)
*len = 88;
return TRUE;
}

21
src/smsutil.h
View File

@ -201,6 +201,13 @@ enum cbs_language {
CBS_LANGUAGE_ICELANDIC = 0x24
};
enum cbs_geo_scope {
CBS_GEO_SCOPE_CELL_IMMEDIATE,
CBS_GEO_SCOPE_PLMN,
CBS_GEO_SCOPE_SERVICE_AREA,
CBS_GEO_SCOPE_CELL_NORMAL
};
struct sms_address {
enum sms_number_type number_type;
enum sms_numbering_plan numbering_plan;
@ -356,6 +363,17 @@ struct sms_assembly {
GSList *assembly_list;
};
struct cbs {
enum cbs_geo_scope gs; /* 2 bits */
guint16 message_code; /* 10 bits */
guint8 update_number; /* 4 bits */
guint16 message_identifier; /* 16 bits */
guint8 dcs; /* 8 bits */
guint8 max_pages; /* 4 bits */
guint8 page; /* 4 bits */
guint8 ud[82];
};
static inline gboolean is_bit_set(unsigned char oct, int bit)
{
int mask = 0x1 << bit;
@ -427,3 +445,6 @@ GSList *sms_text_prepare(const char *utf8, guint16 ref,
gboolean cbs_dcs_decode(guint8 dcs, gboolean *udhi, enum sms_class *cls,
enum sms_charset *charset, gboolean *compressed,
enum cbs_language *language, gboolean *iso639);
gboolean cbs_decode(const unsigned char *pdu, int len, struct cbs *out);
gboolean cbs_encode(const struct cbs *cbs, int *len, unsigned char *pdu);