libjava/classpath/native/jni/java-nio/java_nio_VMDirectByteBuffer.c

   1 /* java_nio_VMDirectByteBuffer.c - Native methods for VMDirectByteBuffer
   2    Copyright (C) 2004, 2005  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 #include <config.h>
  39 #include <errno.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include <jni.h>
  44 #include <jcl.h>
  45
  46 #include "java_nio_VMDirectByteBuffer.h"
  47
  48 JNIEXPORT jobject JNICALL
  49 Java_java_nio_VMDirectByteBuffer_allocate
  50   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)), jint capacity)
  51 {
  52   void *buffer;
  53
  54   buffer = malloc (capacity);
  55
  56   if (buffer == NULL)
  57     {
  58       JCL_ThrowException (env, "java/lang/OutOfMemoryError",
  59                           "unable to allocate memory for direct byte buffer");
  60       return 0;
  61     }
  62
  63   return JCL_NewRawDataObject (env, buffer);
  64 }
  65
  66 JNIEXPORT void JNICALL
  67 Java_java_nio_VMDirectByteBuffer_free
  68   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)), jobject address)
  69 {
  70   free (JCL_GetRawData (env, address));
  71 }
  72
  73 JNIEXPORT jbyte JNICALL
  74 Java_java_nio_VMDirectByteBuffer_get__Lgnu_classpath_Pointer_2I
  75   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
  76    jobject address, jint index)
  77 {
  78   return ((jbyte *) JCL_GetRawData (env, address))[index];
  79 }
  80
  81 JNIEXPORT void JNICALL
  82 Java_java_nio_VMDirectByteBuffer_put__Lgnu_classpath_Pointer_2IB
  83   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
  84    jobject address, jint index, jbyte value)
  85 {
  86   jbyte *pointer = (jbyte *) JCL_GetRawData (env, address) + index;
  87   *pointer = value;
  88 }
  89
  90 JNIEXPORT void JNICALL
  91 Java_java_nio_VMDirectByteBuffer_get__Lgnu_classpath_Pointer_2I_3BII
  92   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
  93    jobject address, jint index, jbyteArray dst, jint dst_offset, jint dst_len)
  94 {
  95   jbyte *src = (jbyte *) JCL_GetRawData (env, address) + index;
  96   jbyte *_dst = (*env)->GetByteArrayElements (env, dst, NULL);
  97   memcpy (_dst + dst_offset, src, dst_len);
  98   (*env)->ReleaseByteArrayElements (env, dst, _dst, 0);
  99 }
 100
 101 JNIEXPORT void JNICALL
 102 Java_java_nio_VMDirectByteBuffer_put__Lgnu_classpath_Pointer_2I_3BII
 103   (JNIEnv *env, jclass clazz __attribute__ ((__unused__)),
 104    jobject address, jint index, jbyteArray src, jint src_offset, jint src_len)
 105 {
 106   jbyte *_src = (*env)->GetByteArrayElements (env, src, NULL);
 107   jbyte *dst = (jbyte *)JCL_GetRawData (env, address);
 108   memcpy (dst + index, _src + src_offset, src_len);
 109   (*env)->ReleaseByteArrayElements (env, src, _src, 0);
 110 }
 111
 112 JNIEXPORT void JNICALL
 113 Java_java_nio_VMDirectByteBuffer_shiftDown
 114   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
 115    jobject address, jint dst_offset, jint src_offset, jint count)
 116 {
 117   jbyte *dst = (jbyte *) JCL_GetRawData (env, address) + dst_offset;
 118   jbyte *src = (jbyte *) JCL_GetRawData (env, address) + src_offset;
 119   memmove (dst, src, count);
 120 }
 121
 122 JNIEXPORT jobject JNICALL
 123 Java_java_nio_VMDirectByteBuffer_adjustAddress
 124   (JNIEnv * env, jclass clazz __attribute__ ((__unused__)),
 125    jobject address, jint offset)
 126 {
 127   return JCL_NewRawDataObject (env, (jbyte *) JCL_GetRawData (env, address) + offset);
 128 }