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

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Santiago1969 opened this issue Oct 11, 2022 · 3 comments
Open

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

Santiago1969 opened this issue Oct 11, 2022 · 3 comments

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@Santiago1969
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Santiago1969 commented Oct 11, 2022 •
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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
@riebl
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riebl commented Oct 18, 2022

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.

@Santiago1969
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Santiago1969 commented Oct 19, 2022 via email

@Santiago1969
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Santiago1969 commented Oct 19, 2022 via email •
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@riebl @Santiago1969