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// Jb Evain (jbevain@gmail.com)
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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namespace Mono.Cecil.Metadata {
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using Mono.Cecil.Binary;
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sealed class MetadataReader : BaseMetadataVisitor {
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BinaryReader m_binaryReader;
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MetadataTableReader m_tableReader;
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public MetadataTableReader TableReader {
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get { return m_tableReader; }
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public MetadataReader (ImageReader brv)
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m_binaryReader = brv.GetReader ();
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public MetadataRoot GetMetadataRoot ()
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public BinaryReader GetDataReader (RVA rva)
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return m_ir.Image.GetReaderAtVirtualAddress (rva);
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public override void VisitMetadataRoot (MetadataRoot root)
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root.Header = new MetadataRoot.MetadataRootHeader ();
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root.Streams = new MetadataStreamCollection ();
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public override void VisitMetadataRootHeader (MetadataRoot.MetadataRootHeader header)
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long headpos = m_binaryReader.BaseStream.Position;
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header.Signature = m_binaryReader.ReadUInt32 ();
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if (header.Signature != MetadataRoot.MetadataRootHeader.StandardSignature)
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throw new MetadataFormatException ("Wrong magic number");
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header.MajorVersion = m_binaryReader.ReadUInt16 ();
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header.MinorVersion = m_binaryReader.ReadUInt16 ();
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header.Reserved = m_binaryReader.ReadUInt32 ();
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uint length = m_binaryReader.ReadUInt32 ();
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long pos = m_binaryReader.BaseStream.Position;
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byte [] version, buffer = new byte [length];
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while (read < length) {
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byte cur = (byte)m_binaryReader.ReadSByte ();
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buffer [read++] = cur;
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version = new byte [read];
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Buffer.BlockCopy (buffer, 0, version, 0, read);
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header.Version = Encoding.UTF8.GetString (version, 0, version.Length);
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pos += length - headpos + 3;
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m_binaryReader.BaseStream.Position = pos;
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header.Version = string.Empty;
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header.Flags = m_binaryReader.ReadUInt16 ();
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header.Streams = m_binaryReader.ReadUInt16 ();
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public override void VisitMetadataStreamCollection (MetadataStreamCollection coll)
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for (int i = 0; i < m_root.Header.Streams; i++)
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coll.Add (new MetadataStream ());
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public override void VisitMetadataStreamHeader (MetadataStream.MetadataStreamHeader header)
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header.Offset = m_binaryReader.ReadUInt32 ();
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header.Size = m_binaryReader.ReadUInt32 ();
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StringBuilder buffer = new StringBuilder ();
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char cur = (char) m_binaryReader.ReadSByte ();
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header.Name = buffer.ToString ();
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if (header.Name.Length == 0)
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throw new MetadataFormatException ("Invalid stream name");
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long rootpos = m_root.GetImage ().ResolveVirtualAddress (
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m_root.GetImage ().CLIHeader.Metadata.VirtualAddress);
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long curpos = m_binaryReader.BaseStream.Position;
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if (header.Size != 0)
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if (header.Size != 0)
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m_binaryReader.BaseStream.Position = curpos;
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header.Stream.Heap = MetadataHeap.HeapFactory (header.Stream);
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public override void VisitGuidHeap (GuidHeap heap)
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public override void VisitStringsHeap (StringsHeap heap)
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if (heap.Data.Length < 1 && heap.Data [0] != 0)
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throw new MetadataFormatException ("Malformed #Strings heap");
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heap [(uint) 0] = string.Empty;
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public override void VisitTablesHeap (TablesHeap heap)
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heap.Tables = new TableCollection (heap);
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BinaryReader br = new BinaryReader (new MemoryStream (heap.Data));
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heap.Reserved = br.ReadUInt32 ();
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heap.MajorVersion = br.ReadByte ();
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heap.MinorVersion = br.ReadByte ();
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heap.HeapSizes = br.ReadByte ();
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heap.Reserved2 = br.ReadByte ();
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heap.Valid = br.ReadInt64 ();
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heap.Sorted = br.ReadInt64 ();
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// COMPACT FRAMEWORK NOTE: BinaryReader is not IDisposable
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public override void VisitBlobHeap (BlobHeap heap)
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public override void VisitUserStringsHeap (UserStringsHeap heap)
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void VisitHeap (MetadataHeap heap)
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long cursor = m_binaryReader.BaseStream.Position;
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m_binaryReader.BaseStream.Position = m_root.GetImage ().ResolveVirtualAddress (
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m_root.GetImage ().CLIHeader.Metadata.VirtualAddress)
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+ heap.GetStream ().Header.Offset;
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heap.Data = m_binaryReader.ReadBytes ((int) heap.GetStream ().Header.Size);
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m_binaryReader.BaseStream.Position = cursor;
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void SetHeapIndexSize (MetadataHeap heap, byte flag)
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TablesHeap th = m_root.Streams.TablesHeap;
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heap.IndexSize = ((th.HeapSizes & flag) > 0) ? 4 : 2;
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public override void TerminateMetadataRoot (MetadataRoot root)
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SetHeapIndexSize (root.Streams.StringsHeap, 0x01);
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SetHeapIndexSize (root.Streams.GuidHeap, 0x02);
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SetHeapIndexSize (root.Streams.BlobHeap, 0x04);
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m_tableReader = new MetadataTableReader (this);
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root.Streams.TablesHeap.Tables.Accept (m_tableReader);