/* | |
* | |
* 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 | |
} |