From 35d0b14df6995e79e84201c45d49ef986f9e0b77 Mon Sep 17 00:00:00 2001
From: Per Bothner <per@bothner.com>
Date: Mon, 16 Feb 2004 12:00:33 -0800
Subject: ByteBuffer.java (endian): Make non-private so other java.nio classes
 can inherit it.

	* java/nio/ByteBuffer.java (endian):  Make non-private so other
	java.nio classes can inherit it.
	(<init>):  Don't bother clearing array_offset.
	* java/nio/ByteBuffer.java (allocate):  Re-implement using wrap.
	* java/nio/ByteBuffer.java (get(byte[],int,int)):  Check underflow.
	Remove redundant test.

	* java/nio/ByteBufferImpl.java (asCharBuffer, asShortBuffer,
	asIntBuffer, asLongBuffer, asFloatBuffer, asDoubleBuffer):
	Use new XxxViewBufferImpl constructors.
	* java/nio/MappedByteBufferImpl.java:  Likewise.
	* java/nio/DirectByteBufferImpl.java:  Likewise.

	* java/nio/ByteBufferImpl.java:  Remove one constructor.
	Inline super in remaining constructor.
	* java/nio/ByteBuffer.java:  Remove unused constructor.

	* java/nio/ByteBufferImpl.java (shiftDown):  New optimized method.

	* java/nio/ByteBufferImpl.java (get, put):  Add array_offset.
	* java/nio/DirectByteBufferImpl.java (owner):  New field.
	(offset):  Remove unused field.
	(<init>):  Modify one and add another constructor.  Change callers.
	(allocateDirect):  Removed - not used.
	(getImpl, putImpl):  Make static and pass address explicitly,
	to make them useful for MappedByteBufferImpl.
	(get, put):  Check for underflow.  Modify for new getImpl.
	(getImpl):  New native method where target is array.
	(get(byte[],int,int)):  Use the above.
	(adjustAddress):  New static native method.
	(slice, duplicate, asReadOnly):  New implementations.
	* java/nio/natDirectByteBufferImpl.cc (getImpl, putImpl, shiftDown,
	adjustAddress):  New or updated native methods.

From-SVN: r77919
---
 libjava/java/nio/ByteBufferImpl.java | 41 ++++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 18 deletions(-)

(limited to 'libjava/java/nio/ByteBufferImpl.java')

diff --git a/libjava/java/nio/ByteBufferImpl.java b/libjava/java/nio/ByteBufferImpl.java
index 6a3814862c9..5d3c3d31a86 100644
--- a/libjava/java/nio/ByteBufferImpl.java
+++ b/libjava/java/nio/ByteBufferImpl.java
@@ -45,45 +45,42 @@ final class ByteBufferImpl extends ByteBuffer
 {
   private boolean readOnly;
 
-  ByteBufferImpl (int capacity)
-  {
-    this (new byte [capacity], 0, capacity, capacity, 0, -1, false);
-  }
-  
   ByteBufferImpl (byte[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)
   {
-    super (buffer, offset, capacity, limit, position, mark);
+    super (capacity, limit, position, mark);
+    this.backing_buffer = buffer;
+    this.array_offset = offset;
     this.readOnly = readOnly;
   }
   
   public CharBuffer asCharBuffer ()
   {
-    return new CharViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new CharViewBufferImpl (this, remaining() >> 1);
   }
 
   public ShortBuffer asShortBuffer ()
   {
-    return new ShortViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new ShortViewBufferImpl (this, remaining() >> 1);
   }
 
   public IntBuffer asIntBuffer ()
   {
-    return new IntViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new IntViewBufferImpl (this, remaining() >> 2);
   }
 
   public LongBuffer asLongBuffer ()
   {
-    return new LongViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new LongViewBufferImpl (this, remaining() >> 3);
   }
 
   public FloatBuffer asFloatBuffer ()
   {
-    return new FloatViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new FloatViewBufferImpl (this, remaining() >> 2);
   }
 
   public DoubleBuffer asDoubleBuffer ()
   {
-    return new DoubleViewBufferImpl (this, position (), remaining(), remaining (), 0, -1, isReadOnly (), order());
+    return new DoubleViewBufferImpl (this, remaining() >> 3);
   }
 
   public boolean isReadOnly ()
@@ -106,6 +103,13 @@ final class ByteBufferImpl extends ByteBuffer
     return new ByteBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
   }
   
+  void shiftDown (int dst_offset, int src_offset, int count)
+  {
+    System.arraycopy(backing_buffer, array_offset + src_offset,
+		     backing_buffer, array_offset + dst_offset,
+		     count);
+  }
+
   public ByteBuffer compact ()
   {
     int pos = position();
@@ -129,7 +133,7 @@ final class ByteBufferImpl extends ByteBuffer
    */
   final public byte get ()
   {
-    byte result = backing_buffer [position ()];
+    byte result = backing_buffer [position () + array_offset];
     position (position () + 1);
     return result;
   }
@@ -144,9 +148,10 @@ final class ByteBufferImpl extends ByteBuffer
   {
     if (readOnly)
       throw new ReadOnlyBufferException ();
-	  	    
-    backing_buffer [position ()] = value;
-    position (position () + 1);
+
+    int pos = position();
+    backing_buffer [pos + array_offset] = value;
+    position (pos + 1);
     return this;
   }
   
@@ -159,7 +164,7 @@ final class ByteBufferImpl extends ByteBuffer
    */
   final public byte get (int index)
   {
-    return backing_buffer [index];
+    return backing_buffer [index + array_offset];
   }
   
   /**
@@ -175,7 +180,7 @@ final class ByteBufferImpl extends ByteBuffer
     if (readOnly)
       throw new ReadOnlyBufferException ();
     	    
-    backing_buffer [index] = value;
+    backing_buffer [index + array_offset] = value;
     return this;
   }
   
-- 
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