65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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* jni_utils.h Utilities for Java Native Interface code
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*
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* Copyright (C) 2014 Simon D. Levy
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this code. If not, see <http:#www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "../../../../../../c/coreslam.h"
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#include <jni.h>
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#include <stdlib.h>
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static jfieldID get_fid(JNIEnv *env, jobject object, const char * fieldname, const char * fieldsig)
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{
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jclass cls = (*env)->GetObjectClass(env, object);
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return (*env)->GetFieldID(env, cls, fieldname, fieldsig);
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}
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static jfieldID get_this_fid(JNIEnv *env, jobject thisobject)
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{
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return get_fid(env, thisobject, "native_ptr", "J");
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}
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static void * ptr_from_obj(JNIEnv *env, jobject thisobject)
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{
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return (void *)(*env)->GetLongField (env, thisobject, get_this_fid(env, thisobject));
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}
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static void ptr_to_obj(JNIEnv *env, jobject thisobject, void * ptr)
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{
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(*env)->SetLongField (env, thisobject, get_this_fid(env, thisobject), (long)ptr);
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}
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static scan_t * cscan_from_jscan(JNIEnv *env, jobject thisobject)
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{
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return (scan_t *)ptr_from_obj(env, thisobject);
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}
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static map_t * cmap_from_jmap(JNIEnv *env, jobject thisobject)
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{
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return (map_t *)ptr_from_obj(env, thisobject);
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}
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static double get_double_field(JNIEnv *env, jobject object, const char * fieldname)
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{
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return (*env)->GetDoubleField (env, object, get_fid(env, object, fieldname, "D"));
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}
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