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FileChannelImpl.java (smallTransferFrom): New.

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2005-03-09  Andrew Haley  <aph@redhat.com>

        * gnu/java/nio/channels/FileChannelImpl.java (smallTransferFrom):
        New.
        (smallTransferTo): New.
        (transferFrom): Loop around smallTransferFrom, copying pageSize
        bytes each time.
        (transferTo): Likewise.

From-SVN: r96240
This commit is contained in:
Andrew Haley 2005-03-10 15:29:15 +00:00 • committed by Andrew Haley
parent 8117c488e1
commit 4fd24a7582
2 changed files with 97 additions and 12 deletions
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9
libjava/ChangeLog
View file

@ -1,3 +1,12 @@
2005-03-09 Andrew Haley <aph@redhat.com>
* gnu/java/nio/channels/FileChannelImpl.java (smallTransferFrom):
New.
(smallTransferTo): New.
(transferFrom): Loop around smallTransferFrom, copying pageSize
bytes each time.
(transferTo): Likewise.
2005-03-09 David Daney <ddaney@avtrex.com>
PR libgcj/20389

100
libjava/gnu/java/nio/channels/FileChannelImpl.java
View file

@ -282,7 +282,30 @@ public final class FileChannelImpl extends FileChannel
throw new ClosedChannelException ();
}
public long transferTo (long position, long count, WritableByteChannel target)
// like transferTo, but with a count of less than 2Gbytes
private int smallTransferTo (long position, int count,
WritableByteChannel target)
throws IOException
{
ByteBuffer buffer;
try
{
// Try to use a mapped buffer if we can. If this fails for
// any reason we'll fall back to using a ByteBuffer.
buffer = map (MapMode.READ_ONLY, position, count);
}
catch (IOException e)
{
buffer = ByteBuffer.allocate (count);
read (buffer, position);
buffer.flip();
}
return target.write (buffer);
}
public long transferTo (long position, long count,
WritableByteChannel target)
throws IOException
{
if (position < 0
@ -295,14 +318,57 @@ public final class FileChannelImpl extends FileChannel
if ((mode & READ) == 0)
throw new NonReadableChannelException ();
// XXX: count needs to be casted from long to int. Dataloss ?
ByteBuffer buffer = ByteBuffer.allocate ((int) count);
read (buffer, position);
buffer.flip();
return target.write (buffer);
final int pageSize = 65536;
long total = 0;
while (count > 0)
{
int transferred
= smallTransferTo (position, (int)Math.min (count, pageSize),
target);
if (transferred < 0)
break;
total += transferred;
position += transferred;
count -= transferred;
}
return total;
}
public long transferFrom (ReadableByteChannel src, long position, long count)
// like transferFrom, but with a count of less than 2Gbytes
private int smallTransferFrom (ReadableByteChannel src, long position,
int count)
throws IOException
{
ByteBuffer buffer = null;
if (src instanceof FileChannel)
{
try
{
// Try to use a mapped buffer if we can. If this fails
// for any reason we'll fall back to using a ByteBuffer.
buffer = ((FileChannel)src).map (MapMode.READ_ONLY, position,
count);
}
catch (IOException e)
{
}
}
if (buffer == null)
{
buffer = ByteBuffer.allocate ((int) count);
src.read (buffer);
buffer.flip();
}
return write (buffer, position);
}
public long transferFrom (ReadableByteChannel src, long position,
long count)
throws IOException
{
if (position < 0
@ -315,11 +381,21 @@ public final class FileChannelImpl extends FileChannel
if ((mode & WRITE) == 0)
throw new NonWritableChannelException ();
// XXX: count needs to be casted from long to int. Dataloss ?
ByteBuffer buffer = ByteBuffer.allocate ((int) count);
src.read (buffer);
buffer.flip();
return write (buffer, position);
final int pageSize = 65536;
long total = 0;
while (count > 0)
{
int transferred = smallTransferFrom (src, position,
(int)Math.min (count, pageSize));
if (transferred < 0)
break;
total += transferred;
position += transferred;
count -= transferred;
}
return total;
}
public FileLock tryLock (long position, long size, boolean shared)