Initial revision
From-SVN: r102074
This commit is contained in:
Tom Tromey
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/* java_nio_VMDirectByteBuffer.c - Native methods for VMDirectByteBuffer
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Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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#include <config.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <jni.h>
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#include <jcl.h>
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#include "java_nio_VMDirectByteBuffer.h"
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static jclass classRawData;
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static jmethodID methodRawDataInit;
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static jfieldID fieldNativePointer;
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static void *NIOGetPointer (JNIEnv *, jobject);
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static jobject NIOGetRawData (JNIEnv *, void *pointer);
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static void *
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NIOGetPointer (JNIEnv * env, jobject rawdata)
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{
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#if SIZEOF_VOID_P == 4
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return (void *) (*env)->GetIntField (env, rawdata, fieldNativePointer);
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#elif SIZEOF_VOID_P == 8
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return (void *) (*env)->GetLongField (env, rawdata, fieldNativePointer);
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#else
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#error unsupported pointer size
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#endif
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}
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static jobject
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NIOGetRawData (JNIEnv * env, void *pointer)
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{
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#if SIZEOF_VOID_P == 4
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return (*env)->NewObject (env, classRawData, methodRawDataInit,
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(jint) pointer);
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#elif SIZEOF_VOID_P == 8
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return (*env)->NewObject (env, classRawData, methodRawDataInit,
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(jlong) pointer);
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#else
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#error unsupported pointer size
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#endif
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}
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JNIEXPORT void JNICALL
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Java_java_nio_VMDirectByteBuffer_init
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)))
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{
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#if SIZEOF_VOID_P == 4
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classRawData = (*env)->FindClass (env, "gnu/classpath/RawData32");
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if (classRawData == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal class");
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return;
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}
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methodRawDataInit = (*env)->GetMethodID (env, classRawData,
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"<init>", "(I)V");
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if (methodRawDataInit == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal constructor");
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return;
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}
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fieldNativePointer = (*env)->GetFieldID (env, classRawData, "data", "I");
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if (fieldNativePointer == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal field");
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return;
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}
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#elif SIZEOF_VOID_P == 8
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classRawData = (*env)->FindClass (env, "gnu/classpath/RawData64");
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if (classRawData == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal class");
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return;
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}
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methodRawDataInit = (*env)->GetMethodID (env, classRawData,
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"<init>", "(J)V");
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if (methodRawDataInit == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal constructor");
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return;
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}
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fieldNativePointer = (*env)->GetFieldID (env, classRawData, "data", "J");
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if (fieldNativePointer == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"unable to find internal field");
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return;
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}
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#else
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#error unsupported pointer size
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#endif
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/* We need to wrap the jclass in global reference to make it persistent */
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if ((classRawData = (*env)->NewGlobalRef (env, classRawData)) == NULL)
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{
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JCL_ThrowException (env, "java/lang/InternalError",
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"failed to create global reference");
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return;
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}
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}
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JNIEXPORT jobject JNICALL
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Java_java_nio_VMDirectByteBuffer_allocate
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)), jint capacity)
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{
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void *buffer;
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buffer = malloc (capacity);
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if (buffer == NULL)
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{
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JCL_ThrowException (env, "java/lang/OutOfMemoryError",
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"unable to allocate memory for direct byte buffer");
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return 0;
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}
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return NIOGetRawData (env, buffer);
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}
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JNIEXPORT void JNICALL
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Java_java_nio_VMDirectByteBuffer_free
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)), jobject address)
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{
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free (NIOGetPointer (env, address));
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}
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JNIEXPORT jbyte JNICALL
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Java_java_nio_VMDirectByteBuffer_get__Lgnu_classpath_RawData_2I
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
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jobject address, jint index)
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{
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return ((jbyte *) NIOGetPointer (env, address))[index];
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}
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JNIEXPORT void JNICALL
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Java_java_nio_VMDirectByteBuffer_put
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
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jobject address, jint index, jbyte value)
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{
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jbyte *pointer = (jbyte *) NIOGetPointer (env, address) + index;
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*pointer = value;
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}
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JNIEXPORT void JNICALL
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Java_java_nio_VMDirectByteBuffer_get__Lgnu_classpath_RawData_2I_3BII
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
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jobject address, jint index, jbyteArray dst, jint dst_offset, jint dst_len)
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{
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jbyte *src = (jbyte *) NIOGetPointer (env, address) + index;
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memcpy ((*env)->GetByteArrayElements (env, dst, NULL) + dst_offset, src,
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dst_len);
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}
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JNIEXPORT void JNICALL
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Java_java_nio_VMDirectByteBuffer_shiftDown
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
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jobject address, jint dst_offset, jint src_offset, jint count)
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{
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jbyte *dst = (jbyte *) NIOGetPointer (env, address) + dst_offset;
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jbyte *src = (jbyte *) NIOGetPointer (env, address) + src_offset;
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memmove (dst, src, count);
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}
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JNIEXPORT jobject JNICALL
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Java_java_nio_VMDirectByteBuffer_adjustAddress
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(JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
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jobject address, jint offset)
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{
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return NIOGetRawData (env, (jbyte *) NIOGetPointer (env, address) + offset);
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}
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