msm8974-common: libril: Encode MCC with 3 digit in CellIdentity

Bug: 145809537
Test: ril::util::mcc::test

Change-Id: Ie0b9d0a56530cc7a2146e9955d392867634d2b8b

ril/include/telephony/ril_mcc.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RIL_MCC_H
+#define RIL_MCC_H
+
+#include <climits>
+#include <cstdio>
+#include <string>
+
+namespace ril {
+namespace util {
+namespace mcc {
+
+/**
+ * Decode an integer mcc and encode as 3 digit string
+ *
+ * @param an integer mcc, its range should be in 0 to 999.
+ *
+ * @return string representation of an encoded MCC or an empty string
+ * if the MCC is not a valid MCC value.
+ */
+static inline std::string decode(int mcc) {
+    char mccStr[4] = {0};
+    if (mcc > 999 || mcc < 0) return "";
+
+    snprintf(mccStr, sizeof(mccStr), "%03d", mcc);
+    return mccStr;
+}
+
+// echo -e "#include \"hardware/ril/include/telephony/ril_mcc.h\"\nint main()"\
+// "{ return ril::util::mcc::test(); }" > ril_test.cpp \
+// && g++ -o /tmp/ril_test -DTEST_RIL_MCC ril_test.cpp; \
+// rm ril_test.cpp; /tmp/ril_test && [ $? ] && echo "passed"
+#ifdef TEST_RIL_MCC
+static int test() {
+    const struct mcc_ints { const int in; const char * out; } legacy_mccs[] = {
+        {INT_MAX, ""},
+        {1, "001"},
+        {11, "011"},
+        {111, "111"},
+        {0, "000"},
+        {9999, ""},
+        {-12, ""},
+    };
+
+    for (int i=0; i < sizeof(legacy_mccs) / sizeof(struct mcc_ints); i++) {
+        if (decode(legacy_mccs[i].in).compare(legacy_mccs[i].out)) return 1;
+    }
+
+    return 0;
+}
+#endif
+
+}
+}
+}
+#endif /* !defined(RIL_MCC_H) */

ril/libril/ril_service.cpp

@@ -28,6 +28,7 @@
 #include <hwbinder/ProcessState.h>
 #include <telephony/ril.h>
 #include <telephony/ril_mnc.h>
+#include <telephony/ril_mcc.h>
 #include <ril_service.h>
 #include <hidl/HidlTransportSupport.h>
 #include <utils/SystemClock.h>
@@ -3575,7 +3576,7 @@ void fillCellIdentityResponse(CellIdentity &cellIdentity, RIL_CellIdentity_v16 &
         case RIL_CELL_INFO_TYPE_GSM: {
             cellIdentity.cellIdentityGsm.resize(1);
             cellIdentity.cellIdentityGsm[0].mcc =
-                    std::to_string(rilCellIdentity.cellIdentityGsm.mcc);
+                    ril::util::mcc::decode(rilCellIdentity.cellIdentityGsm.mcc);
             cellIdentity.cellIdentityGsm[0].mnc =
                     ril::util::mnc::decode(rilCellIdentity.cellIdentityGsm.mnc);
 
@@ -3593,7 +3594,7 @@ void fillCellIdentityResponse(CellIdentity &cellIdentity, RIL_CellIdentity_v16 &
         case RIL_CELL_INFO_TYPE_WCDMA: {
             cellIdentity.cellIdentityWcdma.resize(1);
             cellIdentity.cellIdentityWcdma[0].mcc =
-                    std::to_string(rilCellIdentity.cellIdentityWcdma.mcc);
+                    ril::util::mcc::decode(rilCellIdentity.cellIdentityWcdma.mcc);
             cellIdentity.cellIdentityWcdma[0].mnc =
                     ril::util::mnc::decode(rilCellIdentity.cellIdentityWcdma.mnc);
 
@@ -3622,7 +3623,7 @@ void fillCellIdentityResponse(CellIdentity &cellIdentity, RIL_CellIdentity_v16 &
         case RIL_CELL_INFO_TYPE_LTE: {
             cellIdentity.cellIdentityLte.resize(1);
             cellIdentity.cellIdentityLte[0].mcc =
-                    std::to_string(rilCellIdentity.cellIdentityLte.mcc);
+                    ril::util::mcc::decode(rilCellIdentity.cellIdentityLte.mcc);
             cellIdentity.cellIdentityLte[0].mnc =
                     ril::util::mnc::decode(rilCellIdentity.cellIdentityLte.mnc);
 
@@ -3640,7 +3641,7 @@ void fillCellIdentityResponse(CellIdentity &cellIdentity, RIL_CellIdentity_v16 &
         case RIL_CELL_INFO_TYPE_TD_SCDMA: {
             cellIdentity.cellIdentityTdscdma.resize(1);
             cellIdentity.cellIdentityTdscdma[0].mcc =
-                    std::to_string(rilCellIdentity.cellIdentityTdscdma.mcc);
+                    ril::util::mcc::decode(rilCellIdentity.cellIdentityTdscdma.mcc);
             cellIdentity.cellIdentityTdscdma[0].mnc =
                     ril::util::mnc::decode(rilCellIdentity.cellIdentityTdscdma.mnc);
 
@@ -8095,7 +8096,7 @@ void convertRilCellInfoListToHal(void *response, size_t responseLen, hidl_vec<Ce
                 records[i].gsm.resize(1);
                 CellInfoGsm *cellInfoGsm = &records[i].gsm[0];
                 cellInfoGsm->cellIdentityGsm.mcc =
-                        std::to_string(rillCellInfo->CellInfo.gsm.cellIdentityGsm.mcc);
+                        ril::util::mcc::decode(rillCellInfo->CellInfo.gsm.cellIdentityGsm.mcc);
                 cellInfoGsm->cellIdentityGsm.mnc =
                         ril::util::mnc::decode(rillCellInfo->CellInfo.gsm.cellIdentityGsm.mnc);
                 cellInfoGsm->cellIdentityGsm.lac =
@@ -8119,7 +8120,7 @@ void convertRilCellInfoListToHal(void *response, size_t responseLen, hidl_vec<Ce
                 records[i].wcdma.resize(1);
                 CellInfoWcdma *cellInfoWcdma = &records[i].wcdma[0];
                 cellInfoWcdma->cellIdentityWcdma.mcc =
-                        std::to_string(rillCellInfo->CellInfo.wcdma.cellIdentityWcdma.mcc);
+                        ril::util::mcc::decode(rillCellInfo->CellInfo.wcdma.cellIdentityWcdma.mcc);
                 cellInfoWcdma->cellIdentityWcdma.mnc =
                         ril::util::mnc::decode(rillCellInfo->CellInfo.wcdma.cellIdentityWcdma.mnc);
                 cellInfoWcdma->cellIdentityWcdma.lac =
@@ -8167,7 +8168,7 @@ void convertRilCellInfoListToHal(void *response, size_t responseLen, hidl_vec<Ce
                 records[i].lte.resize(1);
                 CellInfoLte *cellInfoLte = &records[i].lte[0];
                 cellInfoLte->cellIdentityLte.mcc =
-                        std::to_string(rillCellInfo->CellInfo.lte.cellIdentityLte.mcc);
+                        ril::util::mcc::decode(rillCellInfo->CellInfo.lte.cellIdentityLte.mcc);
                 cellInfoLte->cellIdentityLte.mnc =
                         ril::util::mnc::decode(rillCellInfo->CellInfo.lte.cellIdentityLte.mnc);
                 cellInfoLte->cellIdentityLte.ci =
@@ -8197,7 +8198,8 @@ void convertRilCellInfoListToHal(void *response, size_t responseLen, hidl_vec<Ce
                 records[i].tdscdma.resize(1);
                 CellInfoTdscdma *cellInfoTdscdma = &records[i].tdscdma[0];
                 cellInfoTdscdma->cellIdentityTdscdma.mcc =
-                        std::to_string(rillCellInfo->CellInfo.tdscdma.cellIdentityTdscdma.mcc);
+                        ril::util::mcc::decode(
+                                rillCellInfo->CellInfo.tdscdma.cellIdentityTdscdma.mcc);
                 cellInfoTdscdma->cellIdentityTdscdma.mnc =
                         ril::util::mnc::decode(
                                 rillCellInfo->CellInfo.tdscdma.cellIdentityTdscdma.mnc);