From e521edefdaa69d1b78b3d4318e046bb8457123b0 Mon Sep 17 00:00:00 2001 From: Vadim Yanitskiy Date: Wed, 7 Nov 2018 03:53:03 +0700 Subject: [PATCH] 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 --- TODO-RELEASE | 1 + include/osmocom/core/msgb.h | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/TODO-RELEASE b/TODO-RELEASE index 64833d232..5222ec965 100644 --- a/TODO-RELEASE +++ b/TODO-RELEASE @@ -10,3 +10,4 @@ libosmogsm gsm0480_l3hdr_push() removed from gsm/gsm0480.h (was not exposed) libosmogsm gsm48_push_l3hdr() (re)introduced in gsm/gsm48.h (GSM 04.08 API) libosmogsm gsm48_push_l3hdr_tid() a wrapper around gsm48_push_l3hdr() +libosmocore msgb_l4len new symbol (exposed as 'static inline' in msgb.h) diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h index b1cb6ec70..8843db014 100644 --- a/include/osmocom/core/msgb.h +++ b/include/osmocom/core/msgb.h @@ -169,6 +169,18 @@ static inline unsigned int msgb_l3len(const struct msgb *msgb) return msgb->tail - (uint8_t *)msgb_l3(msgb); } +/*! determine length of L4 message + * \param[in] msgb message buffer + * \returns size of L4 message in bytes + * + * This function computes the number of bytes between the tail of the + * message and the layer 4 header. + */ +static inline unsigned int msgb_l4len(const struct msgb *msgb) +{ + return msgb->tail - (uint8_t *)msgb_sms(msgb); +} + /*! determine the length of the header * \param[in] msgb message buffer * \returns number of bytes between start of buffer and start of msg