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
Float_floatToIntBits(JNIEnv *,jclass,jfloat val)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
Float_floatToRawIntBits(JNIEnv *,jclass,jfloat val)40 jint Float_floatToRawIntBits(JNIEnv*, jclass, jfloat val) {
41 Float f;
42 f.f = val;
43 return f.bits;
44 }
45
Float_intBitsToFloat(JNIEnv *,jclass,jint val)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 };
register_java_lang_Float(JNIEnv * env)57 int register_java_lang_Float(JNIEnv* env) {
58 return jniRegisterNativeMethods(env, "java/lang/Float", gMethods, NELEM(gMethods));
59 }
60