libjava/java/nio/natVMDirectByteBufferImpl.cc

   1 // natDirectByteBufferImpl.cc
   2
   3 /* Copyright (C) 2003, 2004  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12
  13 #include <gcj/cni.h>
  14 #include <jvm.h>
  15
  16 #include <stdlib.h>
  17
  18 #include <gnu/gcj/RawData.h>
  19 #include <java/nio/VMDirectByteBuffer.h>
  20
  21 using gnu::gcj::RawData;
  22
  23 RawData*
  24 java::nio::VMDirectByteBuffer::allocate (jint capacity)
  25 {
  26   return reinterpret_cast<gnu::gcj::RawData*> (::malloc (capacity));
  27 }
  28
  29 void
  30 java::nio::VMDirectByteBuffer::free (gnu::gcj::RawData* address)
  31 {
  32   ::free (reinterpret_cast<void*> (address));
  33 }
  34
  35 jbyte
  36 java::nio::VMDirectByteBuffer::get (RawData* address, jint index)
  37 {
  38   jbyte* pointer = reinterpret_cast<jbyte*> (address) + index;
  39   return *pointer;
  40 }
  41
  42 void
  43 java::nio::VMDirectByteBuffer::get (RawData* address, jint index,
  44                                     jbyteArray dst, jint offset, jint length)
  45 {
  46   jbyte* src = reinterpret_cast<jbyte*> (address) + index;
  47   memcpy (elements (dst) + offset, src, length);
  48 }
  49
  50 void
  51 java::nio::VMDirectByteBuffer::put (gnu::gcj::RawData* address,
  52                                     jint index, jbyte value)
  53 {
  54   jbyte* pointer = reinterpret_cast<jbyte*> (address) + index;
  55   *pointer = value;
  56 }
  57
  58 RawData*
  59 java::nio::VMDirectByteBuffer::adjustAddress (RawData* address, jint offset)
  60 {
  61   jbyte* start = reinterpret_cast<jbyte*> (address) + offset;
  62   return reinterpret_cast<RawData*>(start);
  63 }
  64
  65 void
  66 java::nio::VMDirectByteBuffer::shiftDown (RawData* address, jint dst_offset,
  67                                           jint src_offset, jint count)
  68 {
  69   jbyte* dst = reinterpret_cast<jbyte*> (address) + dst_offset;
  70   jbyte* src = reinterpret_cast<jbyte*> (address) + src_offset;
  71   ::memmove(dst, src, count);
  72 }