Change in osmo-ttcn3-hacks[master]: library/PCUIF_Types.ttcn: add explicit ALIGN(left) attribute

Vadim Yanitskiy gerrit-no-reply at
Thu May 16 18:31:55 UTC 2019

Vadim Yanitskiy has uploaded this change for review. (

Change subject: library/PCUIF_Types.ttcn: add explicit ALIGN(left) attribute

library/PCUIF_Types.ttcn: add explicit ALIGN(left) attribute

In the documentation of Eclipse Titan compiler before [1] it was clearly
stated that if the length of the actual value can be determined and it
is less than the specified FIELDLENGTH, the remaining bits / bytes will
be padded with zeros. The attribute ALIGN specifies the sequence of the
actual value and the padding within the encoded field:

  Attribute syntax: ALIGN(<parameter>);
  Parameters allowed: left, right;
  Default value: 'right'.

Since [1], the default value is:

  'left' for octetstrings, 'right' for all other types.


In the most 'BTS_Tests.TC_pcu_*', including both 'TC_pcu_data_req_agch'
and 'TC_pcu_data_req_imm_ass_pch' we do pass the payload of length 23
bytes to ts_PCUIF_DATA_REQ(), what is less than the actual field length
(162 bytes). Thus when using titan.core <= 6.5.3, the payload appears
at the end of the buffer on the BTS side, so it reads 23 zero-bytes
from the beginning and does transmit them.

Let's explicitly add ALIGN(left) to field 'data' of 'PCUIF_data', so
the alignment would be done correctly, as expected by the BTS. Let's
also drop 'OCT162' type, as it doesn't make sense outside the
message definition.

This change makes the following test cases pass:

  - 'TC_pcu_data_req_agch' and
  - 'TC_pcu_data_req_imm_ass_pch'.

Change-Id: Ic4f358e5053e30e0dd7be8b6ac9c1d86cf9d8065
M library/PCUIF_Types.ttcn
1 file changed, 4 insertions(+), 6 deletions(-)

  git pull ssh:// refs/changes/73/14073/1

diff --git a/library/PCUIF_Types.ttcn b/library/PCUIF_Types.ttcn
index 17adbd1..750e0b4 100644
--- a/library/PCUIF_Types.ttcn
+++ b/library/PCUIF_Types.ttcn
@@ -67,12 +67,10 @@
 	PCUIF_Text	text
 } with { variant "" };
-type octetstring OCT162 length(162) with { variant "FIELDLENGTH(162)" };
 type record PCUIF_data {
 	PCUIF_Sapi	sapi,
 	uint8_t		len,
-	OCT162		data,
+	octetstring	data length(162),
 	uint32_t	fn,
 	uint16_t	arfcn,
 	uint8_t		trx_nr,
@@ -82,7 +80,7 @@
 	uint16_t	ber10k,
 	int16_t		ta_offs_qbits,
 	int16_t		lqual_cb
-} with { variant "" };
+} with { variant (data) "FIELDLENGTH(162), ALIGN(left)" };
 type record PCUIF_data_cnf_dt {
 	PCUIF_Sapi	sapi,
@@ -373,7 +371,7 @@
 						 template (value) uint8_t ts_nr,
 						 template (value) uint8_t block_nr,
 						 template (value) PCUIF_Sapi sapi,
-						 template (value) OCT162 data,
+						 template (value) octetstring data,
 						 template (value) uint32_t fn,
 						 template (value) uint16_t arfcn,
 						 template (value) int8_t rssi := -80,
@@ -405,7 +403,7 @@
 					 template uint8_t ts_nr := ?,
 					 template uint8_t block_nr := ?,
 					 template PCUIF_Sapi sapi := ?,
-					 template OCT162 data := ?) := {
+					 template octetstring data := ?) := {
 	msg_type := PCU_IF_MSG_DATA_IND,
 	bts_nr := bts_nr,
 	spare := ?,

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Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Ic4f358e5053e30e0dd7be8b6ac9c1d86cf9d8065
Gerrit-Change-Number: 14073
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <axilirator at>
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