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 "Float" 18 19 #include "JNIHelp.h" 20 #include "JniConstants.h" 21 22 #include <math.h> 23 #include <stdlib.h> 24 #include <stdio.h> 25 26 union Float { 27 unsigned int bits; 28 float f; 29 }; 30 31 static const jint NaN = 0x7fc00000; 32 33 static jint Float_floatToIntBits(JNIEnv*, jclass, jfloat val) { 34 Float f; 35 f.f = val; 36 // For this method all values in the NaN range are normalized to the canonical NaN value. 37 return isnanf(f.f) ? NaN : f.bits; 38 } 39 40 jint Float_floatToRawIntBits(JNIEnv*, jclass, jfloat val) { 41 Float f; 42 f.f = val; 43 return f.bits; 44 } 45 46 jfloat Float_intBitsToFloat(JNIEnv*, jclass, jint val) { 47 Float f; 48 f.bits = val; 49 return f.f; 50 } 51 52 static JNINativeMethod gMethods[] = { 53 NATIVE_METHOD(Float, floatToIntBits, "(F)I"), 54 NATIVE_METHOD(Float, floatToRawIntBits, "(F)I"), 55 NATIVE_METHOD(Float, intBitsToFloat, "(I)F"), 56 }; 57 int register_java_lang_Float(JNIEnv* env) { 58 return jniRegisterNativeMethods(env, "java/lang/Float", gMethods, NELEM(gMethods)); 59 } 60
