[PATCH 3/3] 04.08: add inline funcs for transaction id bits

Various users of gsm48_hdr apply the same hardcoded shifts/bitmasks to obtain the transaction ID encoded in the upper nibble of the protocol discriminator. Centralize. Patch for openbsc.git will follow. --- include/osmocom/gsm/protocol/gsm_04_08.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h index 08f32b7..af9c2e9 100644 --- a/include/osmocom/gsm/protocol/gsm_04_08.h +++ b/include/osmocom/gsm/protocol/gsm_04_08.h @@ -763,6 +763,33 @@ static inline uint8_t gsm48_hdr_pdisc(struct gsm48_hdr *hdr) return pdisc; } +static inline uint8_t gsm48_hdr_trans_id(struct gsm48_hdr *hdr) +{ + /* + * 3GPP TS 24.007 version 12.0.0 Release 12, + * 11.2.3.1.3 Transaction identifier + */ + return (hdr->proto_discr & 0xf0) >> 4; +} + +static inline uint8_t gsm48_hdr_trans_id_flip_ti(struct gsm48_hdr *hdr) +{ + /* + * 3GPP TS 24.007 version 12.0.0 Release 12, + * 11.2.3.1.3 Transaction identifier + */ + return gsm48_hdr_trans_id(hdr) ^ 0x08; +} + +static inline uint8_t gsm48_hdr_trans_id_no_ti(struct gsm48_hdr *hdr) +{ + /* + * 3GPP TS 24.007 version 12.0.0 Release 12, + * 11.2.3.1.3 Transaction identifier + */ + return gsm48_hdr_trans_id(hdr) & 0x07; +} + static inline uint8_t gsm48_hdr_msg_type_r98(struct gsm48_hdr *hdr) { /* -- 2.1.4