1 /* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "Double" 18 19 #include "JNIHelp.h" 20 #include "JniConstants.h" 21 22 #include <math.h> 23 #include <stdlib.h> 24 #include <stdio.h> 25 #include <stdint.h> 26 27 union Double { 28 uint64_t bits; 29 double d; 30 }; 31 32 static const jlong NaN = 0x7ff8000000000000ULL; 33 34 static jlong Double_doubleToLongBits(JNIEnv*, jclass, jdouble val) { 35 Double d; 36 d.d = val; 37 // For this method all values in the NaN range are normalized to the canonical NaN value. 38 return isnan(d.d) ? NaN : d.bits; 39 } 40 41 static jlong Double_doubleToRawLongBits(JNIEnv*, jclass, jdouble val) { 42 Double d; 43 d.d = val; 44 return d.bits; 45 } 46 47 static jdouble Double_longBitsToDouble(JNIEnv*, jclass, jlong val) { 48 Double d; 49 d.bits = val; 50 return d.d; 51 } 52 53 static JNINativeMethod gMethods[] = { 54 NATIVE_METHOD(Double, doubleToLongBits, "(D)J"), 55 NATIVE_METHOD(Double, doubleToRawLongBits, "(D)J"), 56 NATIVE_METHOD(Double, longBitsToDouble, "(J)D"), 57 }; 58 int register_java_lang_Double(JNIEnv* env) { 59 return jniRegisterNativeMethods(env, "java/lang/Double", gMethods, NELEM(gMethods)); 60 } 61
