class/Mono.Cecil/Mono.Cecil.Metadata/MetadataHeap.cs

   1 //
   2 // MetadataHeap.cs
   3 //
   4 // Author:
   5 //   Jb Evain (jbevain@gmail.com)
   6 //
   7 // (C) 2005 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
  29 namespace Mono.Cecil.Metadata {
  30
  31         using System;
  32
  33         using Mono.Cecil;
  34
  35         public abstract class MetadataHeap : IMetadataVisitable  {
  36
  37                 MetadataStream m_stream;
  38                 string m_name;
  39                 byte [] m_data;
  40
  41                 public string Name {
  42                         get { return m_name; }
  43                 }
  44
  45                 public byte [] Data {
  46                         get { return m_data; }
  47                         set { m_data = value; }
  48                 }
  49
  50                 public int IndexSize;
  51
  52                 internal MetadataHeap (MetadataStream stream, string name)
  53                 {
  54                         m_name = name;
  55                         m_stream = stream;
  56                 }
  57
  58                 public static MetadataHeap HeapFactory (MetadataStream stream)
  59                 {
  60                         switch (stream.Header.Name) {
  61                         case MetadataStream.Tables :
  62                         case MetadataStream.IncrementalTables :
  63                                 return new TablesHeap (stream);
  64                         case MetadataStream.GUID :
  65                                 return new GuidHeap (stream);
  66                         case MetadataStream.Strings :
  67                                 return new StringsHeap (stream);
  68                         case MetadataStream.UserStrings :
  69                                 return new UserStringsHeap (stream);
  70                         case MetadataStream.Blob :
  71                                 return new BlobHeap (stream);
  72                         default :
  73                                 return null;
  74                         }
  75                 }
  76
  77                 public MetadataStream GetStream ()
  78                 {
  79                         return m_stream;
  80                 }
  81
  82                 protected virtual byte [] ReadBytesFromStream (uint pos)
  83                 {
  84                         int start, length = Utilities.ReadCompressedInteger (m_data, (int) pos, out start);
  85                         byte [] buffer = new byte [length];
  86                         Buffer.BlockCopy (m_data, start, buffer, 0, length);
  87                         return buffer;
  88                 }
  89
  90                 public abstract void Accept (IMetadataVisitor visitor);
  91         }
  92 }