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/Mono.Cecil/Mono.Cecil.Metadata/StringHeap.cs

http://github.com/icsharpcode/ILSpy
C# | 81 lines | 39 code | 15 blank | 27 comment | 9 complexity | be315961c955b74b528280d005d048ed MD5 | raw file
 1//
 2// StringHeap.cs
 3//
 4// Author:
 5//   Jb Evain (jbevain@gmail.com)
 6//
 7// Copyright (c) 2008 - 2011 Jb Evain
 8//
 9// Permission is hereby granted, free of charge, to any person obtaining
10// a copy of this software and associated documentation files (the
11// "Software"), to deal in the Software without restriction, including
12// without limitation the rights to use, copy, modify, merge, publish,
13// distribute, sublicense, and/or sell copies of the Software, and to
14// permit persons to whom the Software is furnished to do so, subject to
15// the following conditions:
16//
17// The above copyright notice and this permission notice shall be
18// included in all copies or substantial portions of the Software.
19//
20// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27//
28
29using System;
30using System.Collections.Generic;
31using System.Text;
32
33using Mono.Cecil.PE;
34
35namespace Mono.Cecil.Metadata {
36
37	class StringHeap : Heap {
38
39		readonly Dictionary<uint, string> strings = new Dictionary<uint, string> ();
40
41		public StringHeap (Section section, uint start, uint size)
42			: base (section, start, size)
43		{
44		}
45
46		public string Read (uint index)
47		{
48			if (index == 0)
49				return string.Empty;
50
51			string @string;
52			if (strings.TryGetValue (index, out @string))
53				return @string;
54
55			if (index > Size - 1)
56				return string.Empty;
57
58			@string = ReadStringAt (index);
59			if (@string.Length != 0)
60				strings.Add (index, @string);
61
62			return @string;
63		}
64
65		protected virtual string ReadStringAt (uint index)
66		{
67			int length = 0;
68			byte [] data = Section.Data;
69			int start = (int) (index + Offset);
70
71			for (int i = start; ; i++) {
72				if (data [i] == 0)
73					break;
74
75				length++;
76			}
77
78			return Encoding.UTF8.GetString (data, start, length);
79		}
80	}
81}