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//
// ByteBuffer.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
//
// (C) 2009 - 2010 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
namespace Mono.Reflection {
class ByteBuffer {
internal byte [] buffer;
internal int position;
public ByteBuffer (byte [] buffer)
{
this.buffer = buffer;
}
public byte ReadByte ()
{
CheckCanRead (1);
return buffer [position++];
}
public byte [] ReadBytes (int length)
{
CheckCanRead (length);
var value = new byte [length];
Buffer.BlockCopy (buffer, position, value, 0, length);
position += length;
return value;
}
public short ReadInt16 ()
{
CheckCanRead (2);
short value = (short) (buffer [position]
| (buffer [position + 1] << 8));
position += 2;
return value;
}
public int ReadInt32 ()
{
CheckCanRead (4);
int value = buffer [position]
| (buffer [position + 1] << 8)
| (buffer [position + 2] << 16)
| (buffer [position + 3] << 24);
position += 4;
return value;
}
public long ReadInt64 ()
{
CheckCanRead (8);
uint low = (uint) (buffer [position]
| (buffer [position + 1] << 8)
| (buffer [position + 2] << 16)
| (buffer [position + 3] << 24));
uint high = (uint) (buffer [position + 4]
| (buffer [position + 5] << 8)
| (buffer [position + 6] << 16)
| (buffer [position + 7] << 24));
long value = (((long) high) << 32) | low;
position += 8;
return value;
}
public float ReadSingle ()
{
if (!BitConverter.IsLittleEndian) {
var bytes = ReadBytes (4);
Array.Reverse (bytes);
return BitConverter.ToSingle (bytes, 0);
}
CheckCanRead (4);
float value = BitConverter.ToSingle (buffer, position);
position += 4;
return value;
}
public double ReadDouble ()
{
if (!BitConverter.IsLittleEndian) {
var bytes = ReadBytes (8);
Array.Reverse (bytes);
return BitConverter.ToDouble (bytes, 0);
}
CheckCanRead (8);
double value = BitConverter.ToDouble (buffer, position);
position += 8;
return value;
}
void CheckCanRead (int count)
{
if (position + count > buffer.Length)
throw new ArgumentOutOfRangeException ();
}
}
}
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