How to code a SEQUENCE OF inside a SEQUENCE OF (asn1 to c)

I'm working with vanetza to make cpms messages, I have built the .c and .cpp files from the asn1, so the structures of the message have the structure of the asn1. I have a structure (PerceptionDataContainer) which is a SEQUENCE OF PerceptionData, the Sequence of is a special type of list. Each PerceptionData have a perceivedobjects structure which is a SEQUENCE OF PerceivedObject struct, I have made this code to add information to these struct;

vanetza::asn1::Cpm cpm;

auto object = asn1::allocate<PerceivedObject_t>(); //this fill the struct PerceivedObject with basic info
auto perception = asn1::allocate<PerceptionData_t>();

PerceivedObject *arrayobjeto[2];

cpm->cpm.cpmParameters.perceptionData = asn1::allocate<CpmParameters::CpmParameters__perceptionData>();

cpm->header.protocolVersion=2;
cpm->header.messageID=ItsPduHeader__messageID_cpm;
cpm->header.stationID=1;
cpm->cpm.cpmParameters.managementContainer.stationType=2;

for(int i=0; i<2;i++) {
    arrayobjeto[i]=asn1::allocate<PerceivedObject>();
    arrayobjeto[i]->objectID= i+1;
    arrayobjeto[i]->timeOfMeasurement = TimeOfMeasurement_oneMilliSecond;
    arrayobjeto[i]->xDistance.value = DistanceValue_oneMeter;
    arrayobjeto[i]->xDistance.confidence = DistanceConfidence_oneMeter;
    arrayobjeto[i]->yDistance.value = DistanceValue_oneMeter;
    arrayobjeto[i]->yDistance.confidence = DistanceConfidence_oneMeter;
    arrayobjeto[i]->xSpeed.value = SpeedValueExtended_oneCentimeterPerSec;
    arrayobjeto[i]->xSpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec;
    arrayobjeto[i]->ySpeed.value = SpeedValueExtended_oneCentimeterPerSec;
    arrayobjeto[i]->ySpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec;
}
perception->containerId=1;
perception->containerData.present=PerceptionData__containerData_PR_PerceivedObjectContainer;
perception->containerData.choice.PerceivedObjectContainer.numberOfPerceivedObjects=1;

for(int i=0; i<2;i++) {
    EXPECT_EQ(0, ASN_SEQUENCE_ADD(&perception->containerData.choice.PerceivedObjectContainer.perceivedObjects,arrayobjeto[i]));
}
EXPECT_EQ(0, ASN_SEQUENCE_ADD(&cpm->cpm.cpmParameters.perceptionData->list, perception));
EXPECT_EQ(1, cpm->cpm.cpmParameters.perceptionData->list.count);
EXPECT_EQ(2, cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.count);
EXPECT_EQ(perception, cpm->cpm.cpmParameters.perceptionData->list.array[0]);
EXPECT_EQ(arrayobjeto[0], cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.array[0]);

EXPECT_TRUE(cpm.validate());
EXPECT_FALSE(cpm.encode().empty());
ByteBuffer buffer = cpm.encode();
std::cout << "tamaño: " << buffer.size() << "\n";
for (const auto byte:buffer){
    printf("%02x ",byte);
}

ASSERT_TRUE(cpm.decode(buffer));
std::cout << cpm.size();

The definitions of the structs are these:

typedef struct CpmParameters {
   CpmManagementContainer_t     managementContainer;
   struct OriginatingStationData   *stationDataContainer;  /* OPTIONAL */
   struct CpmParameters__perceptionData {
    A_SEQUENCE_OF(struct PerceptionData) list;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
} *perceptionData;

....

  typedef struct PerceptionData {
    CpmContainerId_t     containerId;
    struct PerceptionData__containerData {
        PerceptionData__containerData_PR present;
        union PerceptionData__containerData_u {
            SensorInformationContainer_t     SensorInformationContainer;
            PerceivedObjectContainer_t   PerceivedObjectContainer;
            FreeSpaceAddendumContainer_t     FreeSpaceAddendumContainer;
      } choice;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
} containerData;

....

typedef struct PerceivedObjectContainer {
   NumberOfPerceivedObjects_t   numberOfPerceivedObjects;  /* DEFAULT 0 */
   struct PerceivedObjectContainer__perceivedObjects {
       A_SEQUENCE_OF(struct PerceivedObject) list;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
} perceivedObjects;

/* Context for parsing across buffer boundaries */
asn_struct_ctx_t _asn_ctx;
 } PerceivedObjectContainer_t;

I have reached a good encode but it can not be decode correctly and it seems I have loaded the data into the structs not perfectly, anyone knows how to do it correctly?

When I encode in vanetza the data it does a solution like this: 02 0e 00 00 00 01 00 00 20 13 5a 4e 90 06 b4 9d 20 00 00 00 00 00 18 6a 00 00 01 24 80 80 80 00 00 57 75 03 82 64 40 e0 99 20 00 63 80 01 8c 00 00 04 bb a8 1c 13 22 07 04 c9 00 03 1c 00 0c 60 But when I try to decode it it return false, (can't decode correctly the message) When I don't include the fields of the SEQUENCE OFs it encodes and decodes correctly

Hi @Santiago1969,

if I remember corretly, you should pass perceptionData instead of perceptionData->list to ASN_SEQUENCE_ADD: EXPECT_EQ(0, ASN_SEQUENCE_ADD(cpm->cpm.cpmParameters.perceptionData, perception)); Unfortunately, the whole ASN.1 code is plain C, and thus the void* types accept any pointer type. One has to be extremely careful there and the compiler will just silently accept faulty code.

Hi Raphael,

First of all, thank you for your time

I have made this:

vanetza::asn1::Cpm cpm;

auto object = asn1::allocate<PerceivedObject_t>();
auto perception = asn1::allocate<PerceptionData_t>();
auto sensor = asn1::allocate<SensorInformation>();
auto free = asn1::allocate<FreeSpaceAddendum>();

PerceivedObject *arrayobjeto[2];

cpm->cpm.cpmParameters.perceptionData =

asn1::allocate();

cpm->header.protocolVersion = 2;
cpm->header.messageID = ItsPduHeader__messageID_cpm;
cpm->header.stationID = 1;
cpm->cpm.cpmParameters.managementContainer.stationType = 2;
cpmsolo->header.protocolVersion = 2;
cpmsolo->header.messageID = ItsPduHeader__messageID_cpm;
cpmsolo->header.stationID = 1;
cpmsolo->cpm.cpmParameters.managementContainer.stationType = 2;

for (int i = 0; i < 2; i++) {
    arrayobjeto[i] = asn1::allocate<PerceivedObject>();
    arrayobjeto[i]->objectID = i + 1;
    arrayobjeto[i]->timeOfMeasurement =

TimeOfMeasurement_oneMilliSecond; arrayobjeto[i]->xDistance.value = DistanceValue_oneMeter; arrayobjeto[i]->xDistance.confidence = DistanceConfidence_oneMeter; arrayobjeto[i]->yDistance.value = DistanceValue_oneMeter; arrayobjeto[i]->yDistance.confidence = DistanceConfidence_oneMeter; arrayobjeto[i]->xSpeed.value = SpeedValueExtended_oneCentimeterPerSec; arrayobjeto[i]->xSpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec; arrayobjeto[i]->ySpeed.value = SpeedValueExtended_oneCentimeterPerSec; arrayobjeto[i]->ySpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec; } perception->containerId = 1; perception->containerData.present = PerceptionData__containerData_PR_PerceivedObjectContainer;

perception->containerData.choice.PerceivedObjectContainer.numberOfPerceivedObjects = 1;

for (int i = 0; i < 2; i++) {
    EXPECT_EQ(0,

ASN_SEQUENCE_ADD(&perception->containerData.choice.PerceivedObjectContainer.perceivedObjects,arrayobjeto[i])); }

EXPECT_EQ(0,

ASN_SEQUENCE_ADD(&cpm->cpm.cpmParameters.perceptionData->list, perception)); EXPECT_EQ(1, cpm->cpm.cpmParameters.perceptionData->list.count);

EXPECT_EQ(2,cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.count); EXPECT_EQ(perception, cpm->cpm.cpmParameters.perceptionData->list.array[0]);

EXPECT_EQ(arrayobjeto[0],cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.array[0]);

EXPECT_TRUE(cpm.validate());
EXPECT_FALSE(cpm.encode().empty());
ByteBuffer buffer = cpm.encode();

ASSERT_TRUE(cpm.decode(buffer3));

It doesn't give me an error, but I have analyze and the encoder is not working properly because the decode is false. It seems the message is storing wrong, but I don't know what to change, woudl you kindly give me some advice?

Thank you very much

El mar, 18 oct 2022 a las 20:40, Raphael Riebl @.***>) escribió:

Hi @Santiago1969 https://github.com/Santiago1969,

if I remember corretly, you should pass perceptionData instead of perceptionData->list to ASN_SEQUENCE_ADD: EXPECT_EQ(0, ASN_SEQUENCE_ADD(cpm->cpm.cpmParameters.perceptionData, perception)); Unfortunately, the whole ASN.1 code is plain C, and thus the void* types accept any pointer type. One has to be extremely careful there and the compiler will just silently accept faulty code.

— Reply to this email directly, view it on GitHub https://github.com/riebl/vanetza/issues/168#issuecomment-1282850486, or unsubscribe https://github.com/notifications/unsubscribe-auth/AWMO7YOCJQ7HWICKZKE5ZG3WD3VH7ANCNFSM6AAAAAARCAMRSQ . You are receiving this because you were mentioned.Message ID: @.***>

Apparently I have the information stored in the payload correctly as it doesn't dissapear during the program, here you can see it:

imagen

There are no errors code, just the false result of the cpm.decode() function. Do you know if the structs _asn_ctx must be used for something? We have tried other software (OSS) and it fills the payload of the cpm with their own functions and it's interesting that they mark a special bit for these fields, PerceptionDataContainer and StationDataContainer. Maybe this mark is in _asn_ctx?

El mié, 19 oct 2022 a las 10:48, Santiago Lopez Coll (< @.***>) escribió:

Hi Raphael,

First of all, thank you for your time

I have made this:

vanetza::asn1::Cpm cpm;
auto object = asn1::allocate<PerceivedObject_t>();
auto perception = asn1::allocate<PerceptionData_t>();
auto sensor = asn1::allocate<SensorInformation>();
auto free = asn1::allocate<FreeSpaceAddendum>();

PerceivedObject *arrayobjeto[2];

cpm->cpm.cpmParameters.perceptionData =
asn1::allocate();
cpm->header.protocolVersion = 2;
cpm->header.messageID = ItsPduHeader__messageID_cpm;
cpm->header.stationID = 1;
cpm->cpm.cpmParameters.managementContainer.stationType = 2;
cpmsolo->header.protocolVersion = 2;
cpmsolo->header.messageID = ItsPduHeader__messageID_cpm;
cpmsolo->header.stationID = 1;
cpmsolo->cpm.cpmParameters.managementContainer.stationType = 2;

for (int i = 0; i < 2; i++) {
    arrayobjeto[i] = asn1::allocate<PerceivedObject>();
    arrayobjeto[i]->objectID = i + 1;
    arrayobjeto[i]->timeOfMeasurement =
TimeOfMeasurement_oneMilliSecond; arrayobjeto[i]->xDistance.value = DistanceValue_oneMeter; arrayobjeto[i]->xDistance.confidence = DistanceConfidence_oneMeter; arrayobjeto[i]->yDistance.value = DistanceValue_oneMeter; arrayobjeto[i]->yDistance.confidence = DistanceConfidence_oneMeter; arrayobjeto[i]->xSpeed.value = SpeedValueExtended_oneCentimeterPerSec; arrayobjeto[i]->xSpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec; arrayobjeto[i]->ySpeed.value = SpeedValueExtended_oneCentimeterPerSec; arrayobjeto[i]->ySpeed.confidence = SpeedConfidence_equalOrWithinOneMeterPerSec; } perception->containerId = 1; perception->containerData.present = PerceptionData__containerData_PR_PerceivedObjectContainer;

perception->containerData.choice.PerceivedObjectContainer.numberOfPerceivedObjects = 1;
for (int i = 0; i < 2; i++) {
    EXPECT_EQ(0,
ASN_SEQUENCE_ADD(&perception->containerData.choice.PerceivedObjectContainer.perceivedObjects,arrayobjeto[i])); }
EXPECT_EQ(0,
ASN_SEQUENCE_ADD(&cpm->cpm.cpmParameters.perceptionData->list, perception)); EXPECT_EQ(1, cpm->cpm.cpmParameters.perceptionData->list.count);

EXPECT_EQ(2,cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.count); EXPECT_EQ(perception, cpm->cpm.cpmParameters.perceptionData->list.array[0]);

EXPECT_EQ(arrayobjeto[0],cpm->cpm.cpmParameters.perceptionData->list.array[0]->containerData.choice.PerceivedObjectContainer.perceivedObjects.list.array[0]);
EXPECT_TRUE(cpm.validate());
EXPECT_FALSE(cpm.encode().empty());
ByteBuffer buffer = cpm.encode();

ASSERT_TRUE(cpm.decode(buffer3));
It doesn't give me an error, but I have analyze and the encoder is not working properly because the decode is false. It seems the message is storing wrong, but I don't know what to change, woudl you kindly give me some advice?

Thank you very much

El mar, 18 oct 2022 a las 20:40, Raphael Riebl @.***>) escribió:

Hi @Santiago1969 https://github.com/Santiago1969,

if I remember corretly, you should pass perceptionData instead of perceptionData->list to ASN_SEQUENCE_ADD: EXPECT_EQ(0, ASN_SEQUENCE_ADD(cpm->cpm.cpmParameters.perceptionData, perception)); Unfortunately, the whole ASN.1 code is plain C, and thus the void* types accept any pointer type. One has to be extremely careful there and the compiler will just silently accept faulty code.

— Reply to this email directly, view it on GitHub https://github.com/riebl/vanetza/issues/168#issuecomment-1282850486, or unsubscribe https://github.com/notifications/unsubscribe-auth/AWMO7YOCJQ7HWICKZKE5ZG3WD3VH7ANCNFSM6AAAAAARCAMRSQ . You are receiving this because you were mentioned.Message ID: @.***>

riebl / vanetza

How to code a SEQUENCE OF inside a SEQUENCE OF (asn1 to c) #168