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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
using System;
namespace Apache.Qpid.Buffer
{
internal sealed class SimpleByteBuffer : ByteBuffer
{
private byte[] _buffer;
public override int Capacity
{
get { return _buffer.Length; }
}
public override byte[] Array
{
get { return _buffer; }
}
/// <summary>
/// Initialize a new instance with the desired size
/// </summary>
/// <param name="desiredSize">Initial Length of the array</param>
internal SimpleByteBuffer(int desiredSize)
{
_buffer = new byte[desiredSize];
Position = 0;
Limit = Capacity;
}
/// <summary>
/// Initialize a new instance with the data from
/// an underlying array
/// </summary>
/// <param name="buffer">Initial data</param>
/// <remarks>The original array is copied during construction and is not modified</remarks>
internal SimpleByteBuffer(byte[] buffer)
{
_buffer = (byte[])buffer.Clone();
// position at end
Position = Limit = Capacity;
}
protected override void DoWrite(int position, byte value)
{
// available space is already handled by base class
_buffer[position] = value;
}
protected override void DoWrite(int position, byte[] src, int offset, int length)
{
// available space is already handled by base class
for ( int i = 0; i < length; i++ )
{
_buffer[position+i] = src[offset+i];
}
}
protected override byte DoReadByte(int position)
{
return _buffer[position];
}
protected override void DoReadBytes(int position, byte[] dest, int offset, int length)
{
System.Array.Copy(_buffer, position, dest, offset, length);
}
protected override void DoCompact()
{
if ( Remaining > 0 )
{
if ( Position > 0 )
{
System.Array.Copy(_buffer, Position, _buffer, 0, Remaining);
}
Position = Remaining;
} else
{
Position = 0;
}
Limit = Capacity;
}
protected override void DoResize(int newSize)
{
if ( newSize < Capacity )
throw new NotSupportedException("Cannot resize a buffer to make it smaller");
int newCapacity = 1;
while ( newCapacity < newSize )
{
newCapacity <<= 1;
}
byte[] newBuffer = new byte[newCapacity];
System.Array.Copy(_buffer, newBuffer, _buffer.Length);
_buffer = newBuffer;
}
} // class SimpleByteBuffer
}
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