The Android Open Source Project | adc854b | 2009-03-03 19:28:47 -0800 | [diff] [blame^] | 1 | // |
| 2 | // java_lang_Double.c |
| 3 | // Android |
| 4 | // |
| 5 | // Copyright 2005 The Android Open Source Project |
| 6 | // |
| 7 | #include "JNIHelp.h" |
| 8 | |
| 9 | #include <math.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <stdio.h> |
| 12 | #include <stdint.h> |
| 13 | |
| 14 | typedef union { |
| 15 | uint64_t bits; |
| 16 | double d; |
| 17 | } Double; |
| 18 | |
| 19 | #define NaN (0x7ff8000000000000ULL) |
| 20 | |
| 21 | /* |
| 22 | * public static native long doubleToLongBits(double value) |
| 23 | */ |
| 24 | static jlong doubleToLongBits(JNIEnv* env, jclass clazz, jdouble val) |
| 25 | { |
| 26 | Double d; |
| 27 | |
| 28 | d.d = val; |
| 29 | |
| 30 | // For this method all values in the NaN range are |
| 31 | // normalized to the canonical NaN value. |
| 32 | |
| 33 | if (isnan(d.d)) |
| 34 | d.bits = NaN; |
| 35 | |
| 36 | return d.bits; |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * public static native long doubleToRawLongBits(double value) |
| 41 | */ |
| 42 | static jlong doubleToRawLongBits(JNIEnv* env, jclass clazz, jdouble val) |
| 43 | { |
| 44 | Double d; |
| 45 | |
| 46 | d.d = val; |
| 47 | |
| 48 | return d.bits; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * public static native double longBitsToDouble(long bits) |
| 53 | */ |
| 54 | static jdouble longBitsToDouble(JNIEnv* env, jclass clazz, jlong val) |
| 55 | { |
| 56 | Double d; |
| 57 | |
| 58 | d.bits = val; |
| 59 | |
| 60 | return d.d; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * JNI registration |
| 65 | */ |
| 66 | static JNINativeMethod gMethods[] = { |
| 67 | /* name, signature, funcPtr */ |
| 68 | { "doubleToLongBits", "(D)J", doubleToLongBits }, |
| 69 | { "doubleToRawLongBits", "(D)J", doubleToRawLongBits }, |
| 70 | { "longBitsToDouble", "(J)D", longBitsToDouble }, |
| 71 | }; |
| 72 | int register_java_lang_Double(JNIEnv* env) |
| 73 | { |
| 74 | return jniRegisterNativeMethods(env, "java/lang/Double", |
| 75 | gMethods, NELEM(gMethods)); |
| 76 | } |
| 77 | |