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Jni helper.cpp

lollipop-dev/service/jni/jni_helper.cpp

Header code

namespace android {
/* JNI Helpers for wifi_hal to WifiNative bridge implementation */
void throwException( JNIEnv *env, const char *message, int line );
jboolean  getBoolField(JNIEnv *env, jobject obj, const char *name);
jint  getIntField(JNIEnv *env, jobject obj, const char *name);
jlong getLongField(JNIEnv *env, jobject obj, const char *name);
jobject getObjectField(JNIEnv *env, jobject obj, const char *name, const char *type);
jlong getLongArrayField(JNIEnv *env, jobject obj, const char *name, int index);
jobject getObjectArrayField(JNIEnv *env, jobject obj, const char *name, const char *type, int index);
void setIntField(JNIEnv *env, jobject obj, const char *name, jint value);
void setLongField(JNIEnv *env, jobject obj, const char *name, jlong value);
void setLongArrayField(JNIEnv *env, jobject obj, const char *name, jlongArray value);
void setLongArrayElement(JNIEnv *env, jobject obj, const char *name, int index, jlong value);
void setStringField(JNIEnv *env, jobject obj, const char *name, const char *value);
void reportEvent(JNIEnv *env, jclass cls, const char *method, const char *signature, ...);
jobject createObject(JNIEnv *env, const char *className);
void setObjectField(JNIEnv *env, jobject obj, const char *name, const char *type, jobject value);
jlong getStaticLongField(JNIEnv *env, jobject obj, const char *name);
jlong getStaticLongField(JNIEnv *env, jclass cls, const char *name);
void setStaticLongField(JNIEnv *env, jobject obj, const char *name, jlong value);
void setStaticLongField(JNIEnv *env, jclass cls, const char *name, jlong value);
jlong getStaticLongArrayField(JNIEnv *env, jobject obj, const char *name, int index);
jlong getStaticLongArrayField(JNIEnv *env, jclass cls, const char *name, int index);
void setStaticLongArrayField(JNIEnv *env, jobject obj, const char *name, jlongArray value);
void setStaticLongArrayField(JNIEnv *env, jclass obj, const char *name, jlongArray value);
}
#define THROW(env, message)      throwException(env, message, __LINE__)

Source code

/*
 * Copyright 2008, 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.
 */
#define LOG_TAG "wifi"
#include "jni.h"
#include <ScopedUtfChars.h>
#include <utils/misc.h>
#include <android_runtime/AndroidRuntime.h>
#include <utils/Log.h>
#include <utils/String16.h>
#include "wifi.h"
#include "wifi_hal.h"
#include "jni_helper.h"
namespace android {
/* JNI Helpers for wifi_hal implementation */
void throwException( JNIEnv *env, const char *message, int line )
{
    ALOGE("error at line %d: %s", line, message);
    const char *className = "java/lang/Exception";
    jclass exClass = (env)->FindClass(className );
    if ( exClass == NULL ) {
        ALOGE("Could not find exception class to throw error");
        ALOGE("error at line %d: %s", line, message);
        return;
    }
    (env)->ThrowNew(exClass, message);
}
jboolean getBoolField(JNIEnv *env, jobject obj, const char *name)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, "Z");
    if (field == 0) {
        THROW(env, "Error in accessing field");
        return 0;
    }
    jboolean value = (env)->GetBooleanField(obj, field);
    env->DeleteLocalRef(cls);
    return value;
}
jint getIntField(JNIEnv *env, jobject obj, const char *name)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, "I");
    if (field == 0) {
        THROW(env, "Error in accessing field");
        return 0;
    }
    jint value = (env)->GetIntField(obj, field);
    env->DeleteLocalRef(cls);
    return value;
}
jlong getLongField(JNIEnv *env, jobject obj, const char *name)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, "J");
    if (field == 0) {
        THROW(env, "Error in accessing field");
        return 0;
    }
    jlong value = (env)->GetLongField(obj, field);
    env->DeleteLocalRef(cls);
    return value;
}
jlong getStaticLongField(JNIEnv *env, jobject obj, const char *name)
{
    jclass cls = (env)->GetObjectClass(obj);
    jlong result = getStaticLongField(env, cls, name);
    env->DeleteLocalRef(cls);
    return result;
}
jlong getStaticLongField(JNIEnv *env, jclass cls, const char *name)
{
    jfieldID field = (env)->GetStaticFieldID(cls, name, "J");
    if (field == 0) {
        THROW(env, "Error in accessing field");
        return 0;
    }
    ALOGE("getStaticLongField %s %p", name, cls);
    return (env)->GetStaticLongField(cls, field);
}
jobject getObjectField(JNIEnv *env, jobject obj, const char *name, const char *type)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, type);
    if (field == 0) {
        THROW(env, "Error in accessing field");
        return 0;
    }
    jobject value = (env)->GetObjectField(obj, field);
    env->DeleteLocalRef(cls);
    return value;
}
jlong getLongArrayField(JNIEnv *env, jobject obj, const char *name, int index)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, "[J");
    if (field == 0) {
        THROW(env, "Error in accessing field definition");
        return 0;
    }
    jlongArray array = (jlongArray)(env)->GetObjectField(obj, field);
    if (array == NULL) {
        THROW(env, "Error in accessing array");
        return 0;
    }
    jlong *elem = (env)->GetLongArrayElements(array, 0);
    if (elem == NULL) {
        THROW(env, "Error in accessing index element");
        return 0;
    }
    jlong value = elem[index];
    (env)->ReleaseLongArrayElements(array, elem, 0);
    env->DeleteLocalRef(array);
    env->DeleteLocalRef(cls);
    return value;
}
jlong getStaticLongArrayField(JNIEnv *env, jobject obj, const char *name, int index)
{
    jclass cls = (env)->GetObjectClass(obj);
    jlong result = getStaticLongArrayField(env, cls, name, index);
    env->DeleteLocalRef(cls);
    return result;
}
jlong getStaticLongArrayField(JNIEnv *env, jclass cls, const char *name, int index)
{
    jfieldID field = (env)->GetStaticFieldID(cls, name, "[J");
    if (field == 0) {
        THROW(env, "Error in accessing field definition");
        return 0;
    }
    jlongArray array = (jlongArray)(env)->GetStaticObjectField(cls, field);
    jlong *elem = (env)->GetLongArrayElements(array, 0);
    if (elem == NULL) {
        THROW(env, "Error in accessing index element");
        return 0;
    }
    jlong value = elem[index];
    (env)->ReleaseLongArrayElements(array, elem, 0);
    env->DeleteLocalRef(array);
    return value;
}
jobject getObjectArrayField(JNIEnv *env, jobject obj, const char *name, const char *type, int index)
{
    jclass cls = (env)->GetObjectClass(obj);
    jfieldID field = (env)->GetFieldID(cls, name, type);
    if (field == 0) {
        THROW(env, "Error in accessing field definition");
        return 0;
    }
    jobjectArray array = (jobjectArray)(env)->GetObjectField(obj, field);
    jobject elem = (env)->GetObjectArrayElement(array, index);
    if (elem == NULL) {
        THROW(env, "Error in accessing index element");
        return 0;
    }
    env->DeleteLocalRef(array);
    env->DeleteLocalRef(cls);
    return elem;
}
void setIntField(JNIEnv *env, jobject obj, const char *name, jint value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing class");
        return;
    }
    jfieldID field = (env)->GetFieldID(cls, name, "I");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetIntField(obj, field, value);
    env->DeleteLocalRef(cls);
}
void setLongField(JNIEnv *env, jobject obj, const char *name, jlong value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing class");
        return;
    }
    jfieldID field = (env)->GetFieldID(cls, name, "J");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetLongField(obj, field, value);
    env->DeleteLocalRef(cls);
}
void setStaticLongField(JNIEnv *env, jobject obj, const char *name, jlong value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing class");
        return;
    }
    setStaticLongField(env, cls, name, value);
    env->DeleteLocalRef(cls);
}
void setStaticLongField(JNIEnv *env, jclass cls, const char *name, jlong value)
{
    jfieldID field = (env)->GetStaticFieldID(cls, name, "J");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetStaticLongField(cls, field, value);
}
void setLongArrayField(JNIEnv *env, jobject obj, const char *name, jlongArray value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing field");
        return;
    } else {
        ALOGD("cls = %p", cls);
    }
    jfieldID field = (env)->GetFieldID(cls, name, "[J");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetObjectField(obj, field, value);
    ALOGD("array field set");
    env->DeleteLocalRef(cls);
}
void setStaticLongArrayField(JNIEnv *env, jobject obj, const char *name, jlongArray value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing field");
        return;
    } else {
        ALOGD("cls = %p", cls);
    }
    setStaticLongArrayField(env, cls, name, value);
    env->DeleteLocalRef(cls);
}
void setStaticLongArrayField(JNIEnv *env, jclass cls, const char *name, jlongArray value)
{
    jfieldID field = (env)->GetStaticFieldID(cls, name, "[J");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetStaticObjectField(cls, field, value);
    ALOGD("array field set");
}
void setLongArrayElement(JNIEnv *env, jobject obj, const char *name, int index, jlong value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing field");
        return;
    } else {
        ALOGD("cls = %p", cls);
    }
    jfieldID field = (env)->GetFieldID(cls, name, "[J");
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    } else {
        ALOGD("field = %p", field);
    }
    jlongArray array = (jlongArray)(env)->GetObjectField(obj, field);
    if (array == NULL) {
        THROW(env, "Error in accessing array");
        return;
    } else {
        ALOGD("array = %p", array);
    }
    jlong *elem = (env)->GetLongArrayElements(array, NULL);
    if (elem == NULL) {
        THROW(env, "Error in accessing index element");
        return;
    }
    elem[index] = value;
    env->ReleaseLongArrayElements(array, elem, 0);
    env->DeleteLocalRef(array);
    env->DeleteLocalRef(cls);
}
void setObjectField(JNIEnv *env, jobject obj, const char *name, const char *type, jobject value)
{
    jclass cls = (env)->GetObjectClass(obj);
    if (cls == NULL) {
        THROW(env, "Error in accessing class");
        return;
    }
    jfieldID field = (env)->GetFieldID(cls, name, type);
    if (field == NULL) {
        THROW(env, "Error in accessing field");
        return;
    }
    (env)->SetObjectField(obj, field, value);
    env->DeleteLocalRef(cls);
}
void setStringField(JNIEnv *env, jobject obj, const char *name, const char *value)
{
    jstring str = env->NewStringUTF(value);
    if (str == NULL) {
        THROW(env, "Error in accessing class");
        return;
    }
    setObjectField(env, obj, name, "Ljava/lang/String;", str);
    env->DeleteLocalRef(str);
}
void reportEvent(JNIEnv *env, jclass cls, const char *method, const char *signature, ...)
{
    va_list params;
    va_start(params, signature);
    jmethodID methodID = env->GetStaticMethodID(cls, method, signature);
    if (method == NULL) {
        ALOGE("Error in getting method ID");
        return;
    }
    env->CallStaticVoidMethodV(cls, methodID, params);
    va_end(params);
}
jobject createObject(JNIEnv *env, const char *className)
{
    jclass cls = env->FindClass(className);
    if (cls == NULL) {
        ALOGE("Error in finding class");
        return NULL;
    }
    jmethodID constructor = env->GetMethodID(cls, "<init>", "()V");
    if (constructor == NULL) {
        ALOGE("Error in constructor ID");
        return NULL;
    }
    jobject obj = env->NewObject(cls, constructor);
    if (constructor == NULL) {
        ALOGE("Could not create new object of %s", className);
        return NULL;
    }
    env->DeleteLocalRef(cls);
    return obj;
}
}; // namespace android

com_android_server_wifi_WifiNative.cpp

/*
 * Copyright 2008, 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.
 */
#define LOG_TAG "wifi"
#include "jni.h"
#include <ScopedUtfChars.h>
#include <utils/misc.h>
#include <android_runtime/AndroidRuntime.h>
#include <utils/Log.h>
#include <utils/String16.h>
#include <ctype.h>
#include "wifi.h"
#include "wifi_hal.h"
#include "jni_helper.h"
#define REPLY_BUF_SIZE 4096 // wpa_supplicant's maximum size.
#define EVENT_BUF_SIZE 2048
namespace android {
static jint DBG = false;
static bool doCommand(JNIEnv* env, jstring javaCommand,
                      char* reply, size_t reply_len) {
    ScopedUtfChars command(env, javaCommand);
    if (command.c_str() == NULL) {
        return false; // ScopedUtfChars already threw on error.
    }
    if (DBG) {
        ALOGD("doCommand: %s", command.c_str());
    }
    --reply_len; // Ensure we have room to add NUL termination.
    if (::wifi_command(command.c_str(), reply, &reply_len) != 0) {
        return false;
    }
    // Strip off trailing newline.
    if (reply_len > 0 && reply[reply_len-1] == '\n') {
        reply[reply_len-1] = '\0';
    } else {
        reply[reply_len] = '\0';
    }
    return true;
}
static jint doIntCommand(JNIEnv* env, jstring javaCommand) {
    char reply[REPLY_BUF_SIZE];
    if (!doCommand(env, javaCommand, reply, sizeof(reply))) {
        return -1;
    }
    return static_cast<jint>(atoi(reply));
}
static jboolean doBooleanCommand(JNIEnv* env, jstring javaCommand) {
    char reply[REPLY_BUF_SIZE];
    if (!doCommand(env, javaCommand, reply, sizeof(reply))) {
        return JNI_FALSE;
    }
    return (strcmp(reply, "OK") == 0);
}
// Send a command to the supplicant, and return the reply as a String.
static jstring doStringCommand(JNIEnv* env, jstring javaCommand) {
    char reply[REPLY_BUF_SIZE];
    if (!doCommand(env, javaCommand, reply, sizeof(reply))) {
        return NULL;
    }
    return env->NewStringUTF(reply);
}
static jboolean android_net_wifi_isDriverLoaded(JNIEnv* env, jobject)
{
    return (::is_wifi_driver_loaded() == 1);
}
static jboolean android_net_wifi_loadDriver(JNIEnv* env, jobject)
{
    return (::wifi_load_driver() == 0);
}
static jboolean android_net_wifi_unloadDriver(JNIEnv* env, jobject)
{
    return (::wifi_unload_driver() == 0);
}
static jboolean android_net_wifi_startSupplicant(JNIEnv* env, jobject, jboolean p2pSupported)
{
    return (::wifi_start_supplicant(p2pSupported) == 0);
}
static jboolean android_net_wifi_killSupplicant(JNIEnv* env, jobject, jboolean p2pSupported)
{
    return (::wifi_stop_supplicant(p2pSupported) == 0);
}
static jboolean android_net_wifi_connectToSupplicant(JNIEnv* env, jobject)
{
    return (::wifi_connect_to_supplicant() == 0);
}
static void android_net_wifi_closeSupplicantConnection(JNIEnv* env, jobject)
{
    ::wifi_close_supplicant_connection();
}
static jstring android_net_wifi_waitForEvent(JNIEnv* env, jobject)
{
    char buf[EVENT_BUF_SIZE];
    int nread = ::wifi_wait_for_event(buf, sizeof buf);
    if (nread > 0) {
        return env->NewStringUTF(buf);
    } else {
        return NULL;
    }
}
static jboolean android_net_wifi_doBooleanCommand(JNIEnv* env, jobject, jstring javaCommand) {
    return doBooleanCommand(env, javaCommand);
}
static jint android_net_wifi_doIntCommand(JNIEnv* env, jobject, jstring javaCommand) {
    return doIntCommand(env, javaCommand);
}
static jstring android_net_wifi_doStringCommand(JNIEnv* env, jobject, jstring javaCommand) {
    return doStringCommand(env,javaCommand);
}
/* wifi_hal <==> WifiNative bridge */
static jclass mCls;                             /* saved WifiNative object */
static JavaVM *mVM;                             /* saved JVM pointer */
static const char *WifiHandleVarName = "sWifiHalHandle";
static const char *WifiIfaceHandleVarName = "sWifiIfaceHandles";
static jmethodID OnScanResultsMethodID;
static JNIEnv *getEnv() {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    return env;
}
static wifi_handle getWifiHandle(JNIEnv *env, jclass cls) {
    return (wifi_handle) getStaticLongField(env, cls, WifiHandleVarName);
}
static wifi_interface_handle getIfaceHandle(JNIEnv *env, jclass cls, jint index) {
    return (wifi_interface_handle) getStaticLongArrayField(env, cls, WifiIfaceHandleVarName, index);
}
static jobject createScanResult(JNIEnv *env, wifi_scan_result *result) {
    // ALOGD("creating scan result");
    jobject scanResult = createObject(env, "android/net/wifi/ScanResult");
    if (scanResult == NULL) {
        ALOGE("Error in creating scan result");
        return NULL;
    }
    // ALOGD("setting SSID to %s", result.ssid);
    setStringField(env, scanResult, "SSID", result->ssid);
    char bssid[32];
    sprintf(bssid, "%02x:%02x:%02x:%02x:%02x:%02x", result->bssid[0], result->bssid[1],
        result->bssid[2], result->bssid[3], result->bssid[4], result->bssid[5]);
    setStringField(env, scanResult, "BSSID", bssid);
    setIntField(env, scanResult, "level", result->rssi);
    setIntField(env, scanResult, "frequency", result->channel);
    setLongField(env, scanResult, "timestamp", result->ts);
    return scanResult;
}
static jboolean android_net_wifi_startHal(JNIEnv* env, jclass cls) {
    wifi_handle halHandle = getWifiHandle(env, cls);
    if (halHandle == NULL) {
        wifi_error res = wifi_initialize(&halHandle);
        if (res == WIFI_SUCCESS) {
            setStaticLongField(env, cls, WifiHandleVarName, (jlong)halHandle);
            ALOGD("Did set static halHandle = %p", halHandle);
        }
        env->GetJavaVM(&mVM);
        mCls = (jclass) env->NewGlobalRef(cls);
        ALOGD("halHandle = %p, mVM = %p, mCls = %p", halHandle, mVM, mCls);
        return res == WIFI_SUCCESS;
    } else {
        return true;
    }
}
void android_net_wifi_hal_cleaned_up_handler(wifi_handle handle) {
    ALOGD("In wifi cleaned up handler");
    JNIEnv * env = getEnv();
    setStaticLongField(env, mCls, WifiHandleVarName, 0);
    env->DeleteGlobalRef(mCls);
    mCls = NULL;
    mVM  = NULL;
}
static void android_net_wifi_stopHal(JNIEnv* env, jclass cls) {
    ALOGD("In wifi stop Hal");
    wifi_handle halHandle = getWifiHandle(env, cls);
    wifi_cleanup(halHandle, android_net_wifi_hal_cleaned_up_handler);
}
static void android_net_wifi_waitForHalEvents(JNIEnv* env, jclass cls) {
    ALOGD("waitForHalEvents called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    wifi_handle halHandle = getWifiHandle(env, cls);
    wifi_event_loop(halHandle);
}
static int android_net_wifi_getInterfaces(JNIEnv *env, jclass cls) {
    int n = 0;
    wifi_handle halHandle = getWifiHandle(env, cls);
    wifi_interface_handle *ifaceHandles = NULL;
    int result = wifi_get_ifaces(halHandle, &n, &ifaceHandles);
    if (result < 0) {
        return result;
    }
    if (n < 0) {
        THROW(env, "android_net_wifi_getInterfaces no interfaces");
        return 0;
    }
    if (ifaceHandles == NULL) {
       THROW(env, "android_net_wifi_getInterfaces null interface array");
       return 0;
    }
    if (n > 8) {
        THROW(env, "Too many interfaces");
        return 0;
    }
    jlongArray array = (env)->NewLongArray(n);
    if (array == NULL) {
        THROW(env, "Error in accessing array");
        return 0;
    }
    jlong elems[8];
    for (int i = 0; i < n; i++) {
        elems[i] = reinterpret_cast<jlong>(ifaceHandles[i]);
    }
    env->SetLongArrayRegion(array, 0, n, elems);
    setStaticLongArrayField(env, cls, WifiIfaceHandleVarName, array);
    return (result < 0) ? result : n;
}
static jstring android_net_wifi_getInterfaceName(JNIEnv *env, jclass cls, jint i) {
    char buf[EVENT_BUF_SIZE];
    jlong value = getStaticLongArrayField(env, cls, WifiIfaceHandleVarName, i);
    wifi_interface_handle handle = (wifi_interface_handle) value;
    int result = ::wifi_get_iface_name(handle, buf, sizeof(buf));
    if (result < 0) {
        return NULL;
    } else {
        return env->NewStringUTF(buf);
    }
}
static void onScanResultsAvailable(wifi_request_id id, unsigned num_results) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onScanResultsAvailable called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    reportEvent(env, mCls, "onScanResultsAvailable", "(I)V", id);
}
static void onScanEvent(wifi_scan_event event, unsigned status) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onScanStatus called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    reportEvent(env, mCls, "onScanStatus", "(I)V", status);
}
static void onFullScanResult(wifi_request_id id, wifi_scan_result *result) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onFullScanResult called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    jobject scanResult = createScanResult(env, result);
    ALOGD("Creating a byte array of length %d", result->ie_length);
    jbyteArray elements = env->NewByteArray(result->ie_length);
    if (elements == NULL) {
        ALOGE("Error in allocating array");
        return;
    }
    ALOGE("Setting byte array");
    jbyte *bytes = (jbyte *)&(result->ie_data[0]);
    env->SetByteArrayRegion(elements, 0, result->ie_length, bytes);
    ALOGE("Returning result");
    reportEvent(env, mCls, "onFullScanResult", "(ILandroid/net/wifi/ScanResult;[B)V", id,
            scanResult, elements);
    env->DeleteLocalRef(scanResult);
    env->DeleteLocalRef(elements);
}
static jboolean android_net_wifi_startScan(
        JNIEnv *env, jclass cls, jint iface, jint id, jobject settings) {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("starting scan on interface[%d] = %p", iface, handle);
    wifi_scan_cmd_params params;
    memset(&params, 0, sizeof(params));
    params.base_period = getIntField(env, settings, "base_period_ms");
    params.max_ap_per_scan = getIntField(env, settings, "max_ap_per_scan");
    params.report_threshold = getIntField(env, settings, "report_threshold");
    ALOGD("Initialized common fields %d, %d, %d", params.base_period,
            params.max_ap_per_scan, params.report_threshold);
    const char *bucket_array_type = "[Lcom/android/server/wifi/WifiNative$BucketSettings;";
    const char *channel_array_type = "[Lcom/android/server/wifi/WifiNative$ChannelSettings;";
    jobjectArray buckets = (jobjectArray)getObjectField(env, settings, "buckets", bucket_array_type);
    params.num_buckets = getIntField(env, settings, "num_buckets");
    ALOGD("Initialized num_buckets to %d", params.num_buckets);
    for (int i = 0; i < params.num_buckets; i++) {
        jobject bucket = getObjectArrayField(env, settings, "buckets", bucket_array_type, i);
        params.buckets[i].bucket = getIntField(env, bucket, "bucket");
        params.buckets[i].band = (wifi_band) getIntField(env, bucket, "band");
        params.buckets[i].period = getIntField(env, bucket, "period_ms");
        ALOGD("Initialized common bucket fields %d:%d:%d", params.buckets[i].bucket,
                params.buckets[i].band, params.buckets[i].period);
        int report_events = getIntField(env, bucket, "report_events");
        params.buckets[i].report_events = report_events;
        ALOGD("Initialized report events to %d", params.buckets[i].report_events);
        jobjectArray channels = (jobjectArray)getObjectField(
                env, bucket, "channels", channel_array_type);
        params.buckets[i].num_channels = getIntField(env, bucket, "num_channels");
        ALOGD("Initialized num_channels to %d", params.buckets[i].num_channels);
        for (int j = 0; j < params.buckets[i].num_channels; j++) {
            jobject channel = getObjectArrayField(env, bucket, "channels", channel_array_type, j);
            params.buckets[i].channels[j].channel = getIntField(env, channel, "frequency");
            params.buckets[i].channels[j].dwellTimeMs = getIntField(env, channel, "dwell_time_ms");
            bool passive = getBoolField(env, channel, "passive");
            params.buckets[i].channels[j].passive = (passive ? 1 : 0);
            ALOGD("Initialized channel %d", params.buckets[i].channels[j].channel);
        }
    }
    ALOGD("Initialized all fields");
    wifi_scan_result_handler handler;
    memset(&handler, 0, sizeof(handler));
    handler.on_scan_results_available = &onScanResultsAvailable;
    handler.on_full_scan_result = &onFullScanResult;
    handler.on_scan_event = &onScanEvent;
    return wifi_start_gscan(id, handle, params, handler) == WIFI_SUCCESS;
}
static jboolean android_net_wifi_stopScan(JNIEnv *env, jclass cls, jint iface, jint id) {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("stopping scan on interface[%d] = %p", iface, handle);
    return wifi_stop_gscan(id, handle)  == WIFI_SUCCESS;
}
static jobject android_net_wifi_getScanResults(
        JNIEnv *env, jclass cls, jint iface, jboolean flush)  {

    wifi_scan_result results[256];
    int num_results = 256;

    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("getting scan results on interface[%d] = %p", iface, handle);

    int result = wifi_get_cached_gscan_results(handle, 1, num_results, results, &num_results);
    if (result == WIFI_SUCCESS) {
        jclass clsScanResult = (env)->FindClass("android/net/wifi/ScanResult");
        if (clsScanResult == NULL) {
            ALOGE("Error in accessing class");
            return NULL;
        }
        jobjectArray scanResults = env->NewObjectArray(num_results, clsScanResult, NULL);
        if (scanResults == NULL) {
            ALOGE("Error in allocating array");
            return NULL;
        }
        for (int i = 0; i < num_results; i++) {
            jobject scanResult = createObject(env, "android/net/wifi/ScanResult");
            if (scanResult == NULL) {
                ALOGE("Error in creating scan result");
                return NULL;
            }
            setStringField(env, scanResult, "SSID", results[i].ssid);
            char bssid[32];
            sprintf(bssid, "%02x:%02x:%02x:%02x:%02x:%02x", results[i].bssid[0],
                    results[i].bssid[1], results[i].bssid[2], results[i].bssid[3],
                    results[i].bssid[4], results[i].bssid[5]);
            setStringField(env, scanResult, "BSSID", bssid);
            setIntField(env, scanResult, "level", results[i].rssi);
            setIntField(env, scanResult, "frequency", results[i].channel);
            setLongField(env, scanResult, "timestamp", results[i].ts);
            env->SetObjectArrayElement(scanResults, i, scanResult);
            env->DeleteLocalRef(scanResult);
        }
        return scanResults;
    } else {
        return NULL;
    }
}
static jboolean android_net_wifi_getScanCapabilities(
        JNIEnv *env, jclass cls, jint iface, jobject capabilities) {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("getting scan capabilities on interface[%d] = %p", iface, handle);
    wifi_gscan_capabilities c;
    memset(&c, 0, sizeof(c));
    int result = wifi_get_gscan_capabilities(handle, &c);
    if (result != WIFI_SUCCESS) {
        ALOGD("failed to get capabilities : %d", result);
        return JNI_FALSE;
    }
    setIntField(env, capabilities, "max_scan_cache_size", c.max_scan_cache_size);
    setIntField(env, capabilities, "max_scan_buckets", c.max_scan_buckets);
    setIntField(env, capabilities, "max_ap_cache_per_scan", c.max_ap_cache_per_scan);
    setIntField(env, capabilities, "max_rssi_sample_size", c.max_rssi_sample_size);
    setIntField(env, capabilities, "max_scan_reporting_threshold", c.max_scan_reporting_threshold);
    setIntField(env, capabilities, "max_hotlist_aps", c.max_hotlist_aps);
    setIntField(env, capabilities, "max_significant_wifi_change_aps",
                c.max_significant_wifi_change_aps);
    return JNI_TRUE;
}
static byte parseHexChar(char ch) {
    if (isdigit(ch))
        return ch - '0';
    else if ('A' <= ch && ch <= 'F')
        return ch - 'A' + 10;
    else if ('a' <= ch && ch <= 'f')
        return ch - 'a' + 10;
    else {
        ALOGE("invalid character in bssid %c", ch);
        return 0;
    }
}
static byte parseHexByte(const char * &str) {
    byte b = parseHexChar(str[0]);
    if (str[1] == ':' || str[1] == '\0') {
        str += 2;
        return b;
    } else {
        b = b << 4 | parseHexChar(str[1]);
        str += 3;
        return b;
    }
}
static void parseMacAddress(const char *str, mac_addr addr) {
    addr[0] = parseHexByte(str);
    addr[1] = parseHexByte(str);
    addr[2] = parseHexByte(str);
    addr[3] = parseHexByte(str);
    addr[4] = parseHexByte(str);
    addr[5] = parseHexByte(str);
}
static bool parseMacAddress(JNIEnv *env, jobject obj, mac_addr addr) {
    jstring macAddrString = (jstring) getObjectField(
            env, obj, "bssid", "Ljava/lang/String;");
    if (macAddrString == NULL) {
        ALOGE("Error getting bssid field");
        return false;
    }
    const char *bssid = env->GetStringUTFChars(macAddrString, NULL);
    if (bssid == NULL) {
        ALOGE("Error getting bssid");
        return false;
    }
    parseMacAddress(bssid, addr);
    return true;
}
static void onHotlistApFound(wifi_request_id id,
        unsigned num_results, wifi_scan_result *results) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onHotlistApFound called, vm = %p, obj = %p, env = %p, num_results = %d",
            mVM, mCls, env, num_results);
    jclass clsScanResult = (env)->FindClass("android/net/wifi/ScanResult");
    if (clsScanResult == NULL) {
        ALOGE("Error in accessing class");
        return;
    }
    jobjectArray scanResults = env->NewObjectArray(num_results, clsScanResult, NULL);
    if (scanResults == NULL) {
        ALOGE("Error in allocating array");
        return;
    }
    for (unsigned i = 0; i < num_results; i++) {
        jobject scanResult = createObject(env, "android/net/wifi/ScanResult");
        if (scanResult == NULL) {
            ALOGE("Error in creating scan result");
            return;
        }
        setStringField(env, scanResult, "SSID", results[i].ssid);
        char bssid[32];
        sprintf(bssid, "%02x:%02x:%02x:%02x:%02x:%02x", results[i].bssid[0], results[i].bssid[1],
            results[i].bssid[2], results[i].bssid[3], results[i].bssid[4], results[i].bssid[5]);
        setStringField(env, scanResult, "BSSID", bssid);
        setIntField(env, scanResult, "level", results[i].rssi);
        setIntField(env, scanResult, "frequency", results[i].channel);
        setLongField(env, scanResult, "timestamp", results[i].ts);
        env->SetObjectArrayElement(scanResults, i, scanResult);
        ALOGD("Found AP %32s %s", results[i].ssid, bssid);
    }
    reportEvent(env, mCls, "onHotlistApFound", "(I[Landroid/net/wifi/ScanResult;)V",
        id, scanResults);
}
static jboolean android_net_wifi_setHotlist(
        JNIEnv *env, jclass cls, jint iface, jint id, jobject ap)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("setting hotlist on interface[%d] = %p", iface, handle);
    wifi_bssid_hotlist_params params;
    memset(&params, 0, sizeof(params));
    jobjectArray array = (jobjectArray) getObjectField(env, ap,
            "bssidInfos", "[Landroid/net/wifi/WifiScanner$BssidInfo;");
    params.num_ap = env->GetArrayLength(array);
    if (params.num_ap == 0) {
        ALOGE("Error in accesing array");
        return false;
    }
    for (int i = 0; i < params.num_ap; i++) {
        jobject objAp = env->GetObjectArrayElement(array, i);
        jstring macAddrString = (jstring) getObjectField(
                env, objAp, "bssid", "Ljava/lang/String;");
        if (macAddrString == NULL) {
            ALOGE("Error getting bssid field");
            return false;
        }
        const char *bssid = env->GetStringUTFChars(macAddrString, NULL);
        if (bssid == NULL) {
            ALOGE("Error getting bssid");
            return false;
        }
        parseMacAddress(bssid, params.ap[i].bssid);
        mac_addr addr;
        memcpy(addr, params.ap[i].bssid, sizeof(mac_addr));
        char bssidOut[32];
        sprintf(bssidOut, "%0x:%0x:%0x:%0x:%0x:%0x", addr[0], addr[1],
            addr[2], addr[3], addr[4], addr[5]);
        ALOGD("Added bssid %s", bssidOut);
        params.ap[i].low = getIntField(env, objAp, "low");
        params.ap[i].high = getIntField(env, objAp, "high");
    }
    wifi_hotlist_ap_found_handler handler;
    memset(&handler, 0, sizeof(handler));
    handler.on_hotlist_ap_found = &onHotlistApFound;
    return wifi_set_bssid_hotlist(id, handle, params, handler) == WIFI_SUCCESS;
}
static jboolean android_net_wifi_resetHotlist(
        JNIEnv *env, jclass cls, jint iface, jint id)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("resetting hotlist on interface[%d] = %p", iface, handle);
    return wifi_reset_bssid_hotlist(id, handle) == WIFI_SUCCESS;
}
void onSignificantWifiChange(wifi_request_id id,
        unsigned num_results, wifi_significant_change_result **results) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onSignificantWifiChange called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    jclass clsScanResult = (env)->FindClass("android/net/wifi/ScanResult");
    if (clsScanResult == NULL) {
        ALOGE("Error in accessing class");
        return;
    }
    jobjectArray scanResults = env->NewObjectArray(num_results, clsScanResult, NULL);
    if (scanResults == NULL) {
        ALOGE("Error in allocating array");
        return;
    }
    for (unsigned i = 0; i < num_results; i++) {
        wifi_significant_change_result result = *(results[i]);
        jobject scanResult = createObject(env, "android/net/wifi/ScanResult");
        if (scanResult == NULL) {
            ALOGE("Error in creating scan result");
            return;
        }
        // setStringField(env, scanResult, "SSID", results[i].ssid);
        char bssid[32];
        sprintf(bssid, "%02x:%02x:%02x:%02x:%02x:%02x", result.bssid[0], result.bssid[1],
            result.bssid[2], result.bssid[3], result.bssid[4], result.bssid[5]);
        setStringField(env, scanResult, "BSSID", bssid);
        setIntField(env, scanResult, "level", result.rssi[0]);
        setIntField(env, scanResult, "frequency", result.channel);
        // setLongField(env, scanResult, "timestamp", result.ts);
        env->SetObjectArrayElement(scanResults, i, scanResult);
    }
    reportEvent(env, mCls, "onSignificantWifiChange", "(I[Landroid/net/wifi/ScanResult;)V",
        id, scanResults);
}
static jboolean android_net_wifi_trackSignificantWifiChange(
        JNIEnv *env, jclass cls, jint iface, jint id, jobject settings)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("tracking significant wifi change on interface[%d] = %p", iface, handle);
    wifi_significant_change_params params;
    memset(&params, 0, sizeof(params));
    params.rssi_sample_size = getIntField(env, settings, "rssiSampleSize");
    params.lost_ap_sample_size = getIntField(env, settings, "lostApSampleSize");
    params.min_breaching = getIntField(env, settings, "minApsBreachingThreshold");
    const char *bssid_info_array_type = "[Landroid/net/wifi/WifiScanner$BssidInfo;";
    jobjectArray bssids = (jobjectArray)getObjectField(
                env, settings, "bssidInfos", bssid_info_array_type);
    params.num_ap = env->GetArrayLength(bssids);
    if (params.num_ap == 0) {
        ALOGE("Error in accessing array");
        return false;
    }
    ALOGD("Initialized common fields %d, %d, %d, %d", params.rssi_sample_size,
            params.lost_ap_sample_size, params.min_breaching, params.num_ap);
    for (int i = 0; i < params.num_ap; i++) {
        jobject objAp = env->GetObjectArrayElement(bssids, i);
        jstring macAddrString = (jstring) getObjectField(
                env, objAp, "bssid", "Ljava/lang/String;");
        if (macAddrString == NULL) {
            ALOGE("Error getting bssid field");
            return false;
        }
        const char *bssid = env->GetStringUTFChars(macAddrString, NULL);
        if (bssid == NULL) {
            ALOGE("Error getting bssid");
            return false;
        }
        mac_addr addr;
        parseMacAddress(bssid, addr);
        memcpy(params.ap[i].bssid, addr, sizeof(mac_addr));
        char bssidOut[32];
        sprintf(bssidOut, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1],
            addr[2], addr[3], addr[4], addr[5]);
        params.ap[i].low = getIntField(env, objAp, "low");
        params.ap[i].high = getIntField(env, objAp, "high");
        ALOGD("Added bssid %s, [%04d, %04d]", bssidOut, params.ap[i].low, params.ap[i].high);
    }
    ALOGD("Added %d bssids", params.num_ap);
    wifi_significant_change_handler handler;
    memset(&handler, 0, sizeof(handler));
    handler.on_significant_change = &onSignificantWifiChange;
    return wifi_set_significant_change_handler(id, handle, params, handler) == WIFI_SUCCESS;
}
static jboolean android_net_wifi_untrackSignificantWifiChange(
        JNIEnv *env, jclass cls, jint iface, jint id)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("resetting significant wifi change on interface[%d] = %p", iface, handle);
    return wifi_reset_significant_change_handler(id, handle) == WIFI_SUCCESS;
}
wifi_iface_stat link_stat;
wifi_radio_stat radio_stat; // L release has support for only one radio
void onLinkStatsResults(wifi_request_id id, wifi_iface_stat *iface_stat,
         int num_radios, wifi_radio_stat *radio_stats)
{
    if (iface_stat != 0) {
        memcpy(&link_stat, iface_stat, sizeof(wifi_iface_stat));
    } else {
        memset(&link_stat, 0, sizeof(wifi_iface_stat));
    }
    if (num_radios > 0 && radio_stats != 0) {
        memcpy(&radio_stat, radio_stats, sizeof(wifi_radio_stat));
    } else {
        memset(&radio_stat, 0, sizeof(wifi_radio_stat));
    }
}
static jobject android_net_wifi_getLinkLayerStats (JNIEnv *env, jclass cls, jint iface)  {
    wifi_stats_result_handler handler;
    memset(&handler, 0, sizeof(handler));
    handler.on_link_stats_results = &onLinkStatsResults;
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    int result = wifi_get_link_stats(0, handle, handler);
    if (result < 0) {
        ALOGE("android_net_wifi_getLinkLayerStats: failed to get link statistics\n");
        return NULL;
    }
    jobject wifiLinkLayerStats = createObject(env, "android/net/wifi/WifiLinkLayerStats");
    if (wifiLinkLayerStats == NULL) {
       ALOGE("Error in allocating wifiLinkLayerStats");
       return NULL;
    }
    setIntField(env, wifiLinkLayerStats, "beacon_rx", link_stat.beacon_rx);
    setIntField(env, wifiLinkLayerStats, "rssi_mgmt", link_stat.rssi_mgmt);
    setLongField(env, wifiLinkLayerStats, "rxmpdu_be", link_stat.ac[WIFI_AC_BE].rx_mpdu);
    setLongField(env, wifiLinkLayerStats, "rxmpdu_bk", link_stat.ac[WIFI_AC_BK].rx_mpdu);
    setLongField(env, wifiLinkLayerStats, "rxmpdu_vi", link_stat.ac[WIFI_AC_VI].rx_mpdu);
    setLongField(env, wifiLinkLayerStats, "rxmpdu_vo", link_stat.ac[WIFI_AC_VO].rx_mpdu);
    setLongField(env, wifiLinkLayerStats, "txmpdu_be", link_stat.ac[WIFI_AC_BE].tx_mpdu);
    setLongField(env, wifiLinkLayerStats, "txmpdu_bk", link_stat.ac[WIFI_AC_BK].tx_mpdu);
    setLongField(env, wifiLinkLayerStats, "txmpdu_vi", link_stat.ac[WIFI_AC_VI].tx_mpdu);
    setLongField(env, wifiLinkLayerStats, "txmpdu_vo", link_stat.ac[WIFI_AC_VO].tx_mpdu);
    setLongField(env, wifiLinkLayerStats, "lostmpdu_be", link_stat.ac[WIFI_AC_BE].mpdu_lost);
    setLongField(env, wifiLinkLayerStats, "lostmpdu_bk", link_stat.ac[WIFI_AC_BK].mpdu_lost);
    setLongField(env, wifiLinkLayerStats, "lostmpdu_vi",  link_stat.ac[WIFI_AC_VI].mpdu_lost);
    setLongField(env, wifiLinkLayerStats, "lostmpdu_vo", link_stat.ac[WIFI_AC_VO].mpdu_lost);
    setLongField(env, wifiLinkLayerStats, "retries_be", link_stat.ac[WIFI_AC_BE].retries);
    setLongField(env, wifiLinkLayerStats, "retries_bk", link_stat.ac[WIFI_AC_BK].retries);
    setLongField(env, wifiLinkLayerStats, "retries_vi", link_stat.ac[WIFI_AC_VI].retries);
    setLongField(env, wifiLinkLayerStats, "retries_vo", link_stat.ac[WIFI_AC_VO].retries);
    setIntField(env, wifiLinkLayerStats, "on_time", radio_stat.on_time);
    setIntField(env, wifiLinkLayerStats, "tx_time", radio_stat.tx_time);
    setIntField(env, wifiLinkLayerStats, "rx_time", radio_stat.rx_time);
    setIntField(env, wifiLinkLayerStats, "on_time_scan", radio_stat.on_time_scan);
    return wifiLinkLayerStats;
}
static jint android_net_wifi_getSupportedFeatures(JNIEnv *env, jclass cls, jint iface) {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    feature_set set = 0;
    wifi_error result = WIFI_SUCCESS;
    /*
    set = WIFI_FEATURE_INFRA
        | WIFI_FEATURE_INFRA_5G
        | WIFI_FEATURE_HOTSPOT
        | WIFI_FEATURE_P2P
        | WIFI_FEATURE_SOFT_AP
        | WIFI_FEATURE_GSCAN
        | WIFI_FEATURE_PNO
        | WIFI_FEATURE_TDLS
        | WIFI_FEATURE_EPR;
    */
    result = wifi_get_supported_feature_set(handle, &set);
    if (result == WIFI_SUCCESS) {
        /* Temporary workaround for RTT capability */
        set = set | WIFI_FEATURE_D2AP_RTT;
        ALOGD("wifi_get_supported_feature_set returned set = 0x%x", set);
        return set;
    } else {
        ALOGD("wifi_get_supported_feature_set returned error = 0x%x", result);
        return 0;
    }
}
static void onRttResults(wifi_request_id id, unsigned num_results, wifi_rtt_result results[]) {
    JNIEnv *env = NULL;
    mVM->AttachCurrentThread(&env, NULL);
    ALOGD("onRttResults called, vm = %p, obj = %p, env = %p", mVM, mCls, env);
    jclass clsRttResult = (env)->FindClass("android/net/wifi/RttManager$RttResult");
    if (clsRttResult == NULL) {
        ALOGE("Error in accessing class");
        return;
    }
    jobjectArray rttResults = env->NewObjectArray(num_results, clsRttResult, NULL);
    if (rttResults == NULL) {
        ALOGE("Error in allocating array");
        return;
    }
    for (unsigned i = 0; i < num_results; i++) {
        wifi_rtt_result& result = results[i];
        jobject rttResult = createObject(env, "android/net/wifi/RttManager$RttResult");
        if (rttResult == NULL) {
            ALOGE("Error in creating rtt result");
            return;
        }
        char bssid[32];
        sprintf(bssid, "%02x:%02x:%02x:%02x:%02x:%02x", result.addr[0], result.addr[1],
            result.addr[2], result.addr[3], result.addr[4], result.addr[5]);
        setStringField(env, rttResult, "bssid", bssid);
        setIntField(env,  rttResult, "status",               result.status);
        setIntField(env,  rttResult, "requestType",          result.type);
        setLongField(env, rttResult, "ts",                   result.ts);
        setIntField(env,  rttResult, "rssi",                 result.rssi);
        setIntField(env,  rttResult, "rssi_spread",          result.rssi_spread);
        setIntField(env,  rttResult, "tx_rate",              result.tx_rate.bitrate);
        setLongField(env, rttResult, "rtt_ns",               result.rtt);
        setLongField(env, rttResult, "rtt_sd_ns",            result.rtt_sd);
        setLongField(env, rttResult, "rtt_spread_ns",        result.rtt_spread);
        setIntField(env,  rttResult, "distance_cm",          result.distance);
        setIntField(env,  rttResult, "distance_sd_cm",       result.distance_sd);
        setIntField(env,  rttResult, "distance_spread_cm",   result.distance_spread);
        env->SetObjectArrayElement(rttResults, i, rttResult);
    }
    reportEvent(env, mCls, "onRttResults", "(I[Landroid/net/wifi/RttManager$RttResult;)V",
        id, rttResults);
}
const int MaxRttConfigs = 16;
static jboolean android_net_wifi_requestRange(
        JNIEnv *env, jclass cls, jint iface, jint id, jobject params)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("sending rtt request [%d] = %p", id, handle);
    wifi_rtt_config configs[MaxRttConfigs];
    memset(&configs, 0, sizeof(configs));
    int len = env->GetArrayLength((jobjectArray)params);
    if (len > MaxRttConfigs) {
        return false;
    }
    for (int i = 0; i < len; i++) {
        jobject param = env->GetObjectArrayElement((jobjectArray)params, i);
        if (param == NULL) {
            ALOGD("could not get element %d", i);
            continue;
        }
        wifi_rtt_config &config = configs[i];
        parseMacAddress(env, param, config.addr);
        config.type = (wifi_rtt_type)getIntField(env, param, "requestType");
        config.peer = (wifi_peer_type)getIntField(env, param, "deviceType");
        config.channel.center_freq = getIntField(env, param, "frequency");
        config.channel.width = (wifi_channel_width)getIntField(env, param, "channelWidth");
        config.num_samples_per_measurement = getIntField(env, param, "num_samples");
        config.num_retries_per_measurement = getIntField(env, param, "num_retries");
    }
    wifi_rtt_event_handler handler;
    handler.on_rtt_results = &onRttResults;
    return wifi_rtt_range_request(id, handle, len, configs, handler) == WIFI_SUCCESS;
}
static jboolean android_net_wifi_cancelRange(
        JNIEnv *env, jclass cls, jint iface, jint id, jobject params)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("cancelling rtt request [%d] = %p", id, handle);
    mac_addr addrs[MaxRttConfigs];
    memset(&addrs, 0, sizeof(addrs));
    int len = env->GetArrayLength((jobjectArray)params);
    if (len > MaxRttConfigs) {
        return false;
    }
    for (int i = 0; i < len; i++) {
        jobject param = env->GetObjectArrayElement((jobjectArray)params, i);
        if (param == NULL) {
            ALOGD("could not get element %d", i);
            continue;
        }
        parseMacAddress(env, param, addrs[i]);
    }
    return wifi_rtt_range_cancel(id, handle, len, addrs) == WIFI_SUCCESS;
}
static jboolean android_net_wifi_setScanningMacOui(JNIEnv *env, jclass cls,
        jint iface, jbyteArray param)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("setting scan oui %p", handle);
    static const unsigned oui_len = 3;          /* OUI is upper 3 bytes of mac_address */
    int len = env->GetArrayLength(param);
    if (len != oui_len) {
        ALOGE("invalid oui length %d", len);
        return false;
    }
    jbyte* bytes = env->GetByteArrayElements(param, NULL);
    if (bytes == NULL) {
        ALOGE("failed to get array");
        return false;
    }
    return wifi_set_scanning_mac_oui(handle, (byte *)bytes) == WIFI_SUCCESS;
}
static jintArray android_net_wifi_getValidChannels(JNIEnv *env, jclass cls,
        jint iface, jint band)  {
    wifi_interface_handle handle = getIfaceHandle(env, cls, iface);
    ALOGD("getting valid channels %p", handle);
    static const int MaxChannels = 64;
    wifi_channel channels[64];
    int num_channels = 0;
    wifi_error result = wifi_get_valid_channels(handle, band, MaxChannels,
            channels, &num_channels);
    if (result == WIFI_SUCCESS) {
        jintArray channelArray = env->NewIntArray(num_channels);
        if (channelArray == NULL) {
            ALOGE("failed to allocate channel list");
            return NULL;
        }
        env->SetIntArrayRegion(channelArray, 0, num_channels, channels);
        return channelArray;
    } else {
        ALOGE("failed to get channel list : %d", result);
        return NULL;
    }
}
// ----------------------------------------------------------------------------
/*
 * JNI registration.
 */
static JNINativeMethod gWifiMethods[] = {
    /* name, signature, funcPtr */
    { "loadDriver", "()Z",  (void *)android_net_wifi_loadDriver },
    { "isDriverLoaded", "()Z",  (void *)android_net_wifi_isDriverLoaded },
    { "unloadDriver", "()Z",  (void *)android_net_wifi_unloadDriver },
    { "startSupplicant", "(Z)Z",  (void *)android_net_wifi_startSupplicant },
    { "killSupplicant", "(Z)Z",  (void *)android_net_wifi_killSupplicant },
    { "connectToSupplicantNative", "()Z", (void *)android_net_wifi_connectToSupplicant },
    { "closeSupplicantConnectionNative", "()V",
            (void *)android_net_wifi_closeSupplicantConnection },
    { "waitForEventNative", "()Ljava/lang/String;", (void*)android_net_wifi_waitForEvent },
    { "doBooleanCommandNative", "(Ljava/lang/String;)Z", (void*)android_net_wifi_doBooleanCommand },
    { "doIntCommandNative", "(Ljava/lang/String;)I", (void*)android_net_wifi_doIntCommand },
    { "doStringCommandNative", "(Ljava/lang/String;)Ljava/lang/String;",
            (void*) android_net_wifi_doStringCommand },
    { "startHalNative", "()Z", (void*) android_net_wifi_startHal },
    { "stopHalNative", "()V", (void*) android_net_wifi_stopHal },
    { "waitForHalEventNative", "()V", (void*) android_net_wifi_waitForHalEvents },
    { "getInterfacesNative", "()I", (void*) android_net_wifi_getInterfaces},
    { "getInterfaceNameNative", "(I)Ljava/lang/String;", (void*) android_net_wifi_getInterfaceName},
    { "getScanCapabilitiesNative", "(ILcom/android/server/wifi/WifiNative$ScanCapabilities;)Z",
            (void *) android_net_wifi_getScanCapabilities},
    { "startScanNative", "(IILcom/android/server/wifi/WifiNative$ScanSettings;)Z",
            (void*) android_net_wifi_startScan},
    { "stopScanNative", "(II)Z", (void*) android_net_wifi_stopScan},
    { "getScanResultsNative", "(IZ)[Landroid/net/wifi/ScanResult;",
            (void *) android_net_wifi_getScanResults},
    { "setHotlistNative", "(IILandroid/net/wifi/WifiScanner$HotlistSettings;)Z",
            (void*) android_net_wifi_setHotlist},
    { "resetHotlistNative", "(II)Z", (void*) android_net_wifi_resetHotlist},
    { "trackSignificantWifiChangeNative", "(IILandroid/net/wifi/WifiScanner$WifiChangeSettings;)Z",
            (void*) android_net_wifi_trackSignificantWifiChange},
    { "untrackSignificantWifiChangeNative", "(II)Z",
            (void*) android_net_wifi_untrackSignificantWifiChange},
    { "getWifiLinkLayerStatsNative", "(I)Landroid/net/wifi/WifiLinkLayerStats;",
            (void*) android_net_wifi_getLinkLayerStats},
    { "getSupportedFeatureSetNative", "(I)I",
            (void*) android_net_wifi_getSupportedFeatures},
    { "requestRangeNative", "(II[Landroid/net/wifi/RttManager$RttParams;)Z",
            (void*) android_net_wifi_requestRange},
    { "cancelRangeRequestNative", "(II[Landroid/net/wifi/RttManager$RttParams;)Z",
            (void*) android_net_wifi_cancelRange},
    { "setScanningMacOuiNative", "(I[B)Z", (void*) android_net_wifi_setScanningMacOui},
    { "getChannelsForBandNative", "(II)[I", (void*) android_net_wifi_getValidChannels}
};
int register_android_net_wifi_WifiNative(JNIEnv* env) {
    return AndroidRuntime::registerNativeMethods(env,
            "com/android/server/wifi/WifiNative", gWifiMethods, NELEM(gWifiMethods));
}
/* User to register native functions */
extern "C"
jint Java_com_android_server_wifi_WifiNative_registerNatives(JNIEnv* env, jclass clazz) {
    return AndroidRuntime::registerNativeMethods(env,
            "com/android/server/wifi/WifiNative", gWifiMethods, NELEM(gWifiMethods));
}
}; // namespace android

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