mirror of https://gerrit.osmocom.org/libosmocore
core/msgb.h: introduce msgb_l4len() helper
There is already a group of similar functions for L1, L2 and L3, but L4 was missing. The L4 is usually used for parsing of complex L3 messages, such as SS/USSD and SMS. This change introduces a similar halper for L4. Change-Id: I755f2d654bbdad2a8b4f94df9023bdd370b07ae6
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@ -10,3 +10,4 @@
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libosmogsm gsm0480_l3hdr_push() removed from gsm/gsm0480.h (was not exposed)
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libosmogsm gsm48_push_l3hdr() (re)introduced in gsm/gsm48.h (GSM 04.08 API)
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libosmogsm gsm48_push_l3hdr_tid() a wrapper around gsm48_push_l3hdr()
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libosmocore msgb_l4len new symbol (exposed as 'static inline' in msgb.h)
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@ -169,6 +169,18 @@ static inline unsigned int msgb_l3len(const struct msgb *msgb)
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return msgb->tail - (uint8_t *)msgb_l3(msgb);
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}
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/*! determine length of L4 message
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* \param[in] msgb message buffer
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* \returns size of L4 message in bytes
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*
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* This function computes the number of bytes between the tail of the
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* message and the layer 4 header.
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*/
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static inline unsigned int msgb_l4len(const struct msgb *msgb)
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{
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return msgb->tail - (uint8_t *)msgb_sms(msgb);
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}
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/*! determine the length of the header
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* \param[in] msgb message buffer
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* \returns number of bytes between start of buffer and start of msg
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