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gsmtap_util: Add chantype_gsmtap2rsl() as inverse of chantype_rsl2gsmtap() 

Change-Id: Ie1bc00670887064da0fea61c3dab036c23ceea25
This commit is contained in:
Harald Welte 2017-07-12 23:43:40 +02:00
parent b808da44ab
commit 93713a55b9
2 changed files with 41 additions and 1 deletions
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1
include/osmocom/core/gsmtap_util.h
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@ -9,6 +9,7 @@
* \file gsmtap_util.h */
uint8_t chantype_rsl2gsmtap(uint8_t rsl_chantype, uint8_t rsl_link_id);
void chantype_gsmtap2rsl(uint8_t gsmtap_chantype, uint8_t *rsl_chantype, uint8_t *link_id);
struct msgb *gsmtap_makemsg_ex(uint8_t type, uint16_t arfcn, uint8_t ts, uint8_t chan_type,
uint8_t ss, uint32_t fn, int8_t signal_dbm,

41
src/gsmtap_util.c
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@ -1,7 +1,7 @@
/*! \file gsmtap_util.c
* GSMTAP support code in libosmocore. */
/*
* (C) 2010-2011 by Harald Welte <laforge@gnumonks.org>
* (C) 2010-2017 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
@ -89,6 +89,45 @@ uint8_t chantype_rsl2gsmtap(uint8_t rsl_chantype, uint8_t link_id)
return ret;
}
/*! convert GSMTAP channel type to RSL channel number + Link ID
* \param[in] gsmtap_chantype GSMTAP channel type
* \param[out] rsl_chantype RSL channel mumber
* \param[out] link_id RSL link identifier
*/
void chantype_gsmtap2rsl(uint8_t gsmtap_chantype, uint8_t *rsl_chantype,
uint8_t *link_id)
{
switch (gsmtap_chantype & ~GSMTAP_CHANNEL_ACCH & 0xff) {
case GSMTAP_CHANNEL_TCH_F: // TCH/F, FACCH/F
*rsl_chantype = RSL_CHAN_Bm_ACCHs;
break;
case GSMTAP_CHANNEL_TCH_H: // TCH/H, FACCH/H
*rsl_chantype = RSL_CHAN_Lm_ACCHs;
break;
case GSMTAP_CHANNEL_SDCCH4: // SDCCH/4
*rsl_chantype = RSL_CHAN_SDCCH4_ACCH;
break;
case GSMTAP_CHANNEL_SDCCH8: // SDCCH/8
*rsl_chantype = RSL_CHAN_SDCCH8_ACCH;
break;
case GSMTAP_CHANNEL_BCCH: // BCCH
*rsl_chantype = RSL_CHAN_BCCH;
break;
case GSMTAP_CHANNEL_RACH: // RACH
*rsl_chantype = RSL_CHAN_RACH;
break;
case GSMTAP_CHANNEL_PCH: // PCH
case GSMTAP_CHANNEL_AGCH: // AGCH
*rsl_chantype = RSL_CHAN_PCH_AGCH;
break;
case GSMTAP_CHANNEL_PDCH:
*rsl_chantype = GSMTAP_CHANNEL_PDCH;
break;
}
*link_id = gsmtap_chantype & GSMTAP_CHANNEL_ACCH ? 0x40 : 0x00;
}
/*! create an arbitrary type GSMTAP message
* \param[in] type The GSMTAP_TYPE_xxx constant of the message to create
* \param[in] arfcn GSM ARFCN (Channel Number)