/Mono.Cecil.Metadata/BlobHeap.cs

 1//
 2// Author:
 3//   Jb Evain (jbevain@gmail.com)
 4//
 5// Copyright (c) 2008 - 2015 Jb Evain
 6// Copyright (c) 2008 - 2011 Novell, Inc.
 7//
 8// Licensed under the MIT/X11 license.
 9//
10
11using System;
12
13namespace Mono.Cecil.Metadata {
14
15	sealed class BlobHeap : Heap {
16
17		public BlobHeap (byte [] data)
18			: base (data)
19		{
20		}
21
22		public byte [] Read (uint index)
23		{
24			if (index == 0 || index > this.data.Length - 1)
25				return Empty<byte>.Array;
26
27			int position = (int) index;
28			int length = (int) data.ReadCompressedUInt32 (ref position);
29
30			if (length > data.Length - position)
31				return Empty<byte>.Array;
32
33			var buffer = new byte [length];
34
35			Buffer.BlockCopy (data, position, buffer, 0, length);
36
37			return buffer;
38		}
39
40		public void GetView (uint signature, out byte [] buffer, out int index, out int length)
41		{
42			if (signature == 0 || signature > data.Length - 1) {
43				buffer = null;
44				index = length = 0;
45				return;
46			}
47
48			buffer = data;
49
50			index = (int) signature;
51			length = (int) buffer.ReadCompressedUInt32 (ref index);
52		}
53	}
54}