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/*
* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.channels.spi.*;
/**
* File-descriptor based I/O utilities that are shared by NIO classes.
*/
class IOUtil {
private IOUtil() { } // No instantiation
static boolean randomBytes(byte[] someBytes)
{
try
{
if (false) throw new cli.System.Security.Cryptography.CryptographicException();
cli.System.Security.Cryptography.RNGCryptoServiceProvider csp = new cli.System.Security.Cryptography.RNGCryptoServiceProvider();
csp.GetBytes(someBytes);
return true;
}
catch (cli.System.Security.Cryptography.CryptographicException _)
{
return false;
}
}
static void configureBlocking(FileDescriptor fd, boolean blocking) throws IOException
{
fd.setSocketBlocking(blocking);
}
// this is a dummy method to allow us to use unmodified socket channel impls
static int fdVal(FileDescriptor fd)
{
return 0xbadc0de;
}
static int read(FileDescriptor fd, ByteBuffer dst, long position,
NativeDispatcher nd, Object lock)
throws IOException
{
if (dst.isReadOnly())
throw new IllegalArgumentException("Read-only buffer");
if (position != -1)
{
synchronized (lock)
{
long prevpos = fd.getFilePointer();
try
{
fd.seek(position);
return read(fd, dst, -1, nd, null);
}
finally
{
fd.seek(prevpos);
}
}
}
if (dst.hasArray())
{
byte[] buf = dst.array();
int len = nd.read(fd, buf, dst.arrayOffset() + dst.position(), dst.remaining());
if (len > 0)
{
dst.position(dst.position() + len);
}
return len;
}
else
{
byte[] buf = new byte[dst.remaining()];
int len = nd.read(fd, buf, 0, buf.length);
if (len > 0)
{
dst.put(buf, 0, len);
}
return len;
}
}
static long read(FileDescriptor fd, ByteBuffer[] bufs, int offset, int length, NativeDispatcher nd)
throws IOException
{
return nd.read(fd, bufs, offset, length);
}
static int write(FileDescriptor fd, ByteBuffer src, long position,
NativeDispatcher nd, Object lock)
throws IOException
{
if (position != -1)
{
synchronized (lock)
{
long prevpos = fd.getFilePointer();
try
{
fd.seek(position);
return write(fd, src, -1, nd, null);
}
finally
{
fd.seek(prevpos);
}
}
}
if (src.hasArray())
{
byte[] buf = src.array();
int len = nd.write(fd, buf, src.arrayOffset() + src.position(), src.remaining());
if (len > 0)
{
src.position(src.position() + len);
}
return len;
}
else
{
int pos = src.position();
byte[] buf = new byte[src.remaining()];
src.get(buf);
src.position(pos);
int len = nd.write(fd, buf, 0, buf.length);
if (len > 0)
{
src.position(pos + len);
}
return len;
}
}
static long write(FileDescriptor fd, ByteBuffer[] bufs, NativeDispatcher nd)
throws IOException
{
return nd.write(fd, bufs, 0, bufs.length);
}
static long write(FileDescriptor fd, ByteBuffer[] bufs, int offset, int length, NativeDispatcher nd)
throws IOException
{
return nd.write(fd, bufs, offset, length);
}
}
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