Rewrite mmap operations with KNI

app/src/main/cpp/fdutils.c

@@ -24,17 +24,6 @@ Java_com_hippo_Native_getFd(JNIEnv *env, jclass clazz, jobject fileDescriptor) {
     return fd;
 }
 
-JNIEXPORT jobject JNICALL
-Java_com_hippo_Native_mapFd(JNIEnv *env, jclass clazz, jint fd, jlong capability) {
-    void *addr = mmap(0, capability, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-    if (addr != MAP_FAILED) {
-        return (*env)->NewDirectByteBuffer(env, addr, capability);
-    } else {
-        LOGE("%s%s", "mmap failed with error ", strerror(errno));
-        return NULL;
-    }
-}
-
 JNIEXPORT void JNICALL
 Java_com_hippo_Native_unmapDirectByteBuffer(JNIEnv *env, jclass clazz, jobject buffer) {
     void *addr = (*env)->GetDirectBufferAddress(env, buffer);