ECC-1150: Deal with encoding a MISSING value

src/grib_accessor_class_from_scale_factor_scaled_value.c

@@ -200,6 +200,14 @@ static int pack_double(grib_accessor* a, const double* val, size_t* len)
         return GRIB_SUCCESS;
     }
 
+    if (exact == GRIB_MISSING_DOUBLE) {
+        if ((ret = grib_set_missing(hand, self->scaleFactor)) != GRIB_SUCCESS)
+            return ret;
+        if ((ret = grib_set_missing(hand, self->scaledValue)) != GRIB_SUCCESS)
+            return ret;
+        return GRIB_SUCCESS;
+    }
+
     accessor_factor = grib_find_accessor(hand, self->scaleFactor);
     accessor_value  = grib_find_accessor(hand, self->scaledValue);
     if (!accessor_factor || !accessor_value) {

tests/grib_ecc-1150.sh

@@ -20,8 +20,8 @@ tempFilt=temp.${label}.filt
 
 in=$ECCODES_SAMPLES_PATH/GRIB2.tmpl
 
-# Lower limit
-# -------------
+# Decoding: Lower limit
+# ----------------------
 ${tools_dir}/grib_set -s \
    productDefinitionTemplateNumber=5,scaleFactorOfLowerLimit=missing,scaledValueOfLowerLimit=missing \
    $in $tempGrib
@@ -39,8 +39,8 @@ EOF
 ${tools_dir}/grib_filter $tempFilt $tempGrib
 
 
-# Try upper limit too
-# --------------------
+# Decoding: upper limit
+# -----------------------
 ${tools_dir}/grib_set -s \
    productDefinitionTemplateNumber=5,scaleFactorOfUpperLimit=missing,scaledValueOfUpperLimit=missing \
    $in $tempGrib
@@ -57,6 +57,15 @@ cat > $tempFilt <<EOF
 EOF
 ${tools_dir}/grib_filter $tempFilt $tempGrib
 
+# Encoding
+# ----------
+temp2=temp2.${label}.grib
+${tools_dir}/grib_set -s upperLimit=missing,lowerLimit=missing $tempGrib $temp2
+grib_check_key_equals $temp2 lowerLimit,upperLimit 'MISSING MISSING'
+grib_check_key_equals $temp2 \
+  scaleFactorOfLowerLimit,scaledValueOfLowerLimit,scaleFactorOfUpperLimit,scaledValueOfUpperLimit \
+  'MISSING MISSING MISSING MISSING'
+rm -f $temp2
 
 # Clean up
 rm -f $tempGrib $tempFilt