Class MetaDataTablesHdr

The Meta Data Tables Header contains information about all present data tables in the .Net assembly.

Inheritance

System.Object

AbstractStructure

MetaDataTablesHdr

Implements

IMetaDataTablesHdr

Namespace: PeNet.Header.Net

Assembly: PeNet.dll

Syntax

public class MetaDataTablesHdr : AbstractStructure, IMetaDataTablesHdr

Constructors

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MetaDataTablesHdr(IRawFile, Int64)

Create a new Meta Data Tables Header instance from a byte array.

Declaration

public MetaDataTablesHdr(IRawFile peFile, long offset)

Parameters

Type	Name	Description
IRawFile	peFile	PE file which contains a MetaDataTablesHdr structure.
System.Int64	offset	Offset in the PE file, where the header starts.

Properties

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ExtraData

When present in the PE file, gets or sets the extra 32-bits stored after the table row counts.

Declaration

public uint? ExtraData { get; set; }

Property Value

Type	Description
System.Nullable<System.UInt32>

Remarks

This is an undocumented feature of the CLR. See also: https://github.com/dotnet/runtime/blob/ce2165d8084cca98b95f5d8ff9386759bfd8c722/src/coreclr/md/runtime/metamodel.cpp#L290

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HasExtraData

Gets a value indicating whether the tables stream header contains an additional 32-bits after the table row counts.

Declaration

public bool HasExtraData { get; }

Property Value

Type	Description
System.Boolean

Remarks

This is an undocumented feature of the CLR. See also: https://github.com/dotnet/runtime/blob/ce2165d8084cca98b95f5d8ff9386759bfd8c722/src/coreclr/md/runtime/metamodel.cpp#L290

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HeapSizes

The first 3 bits indicate the size of indexes into the streams. Bit 0 (0x01) set: Indexes into #String are 4 bytes wide. Bit 1 (0x02) set: Indexes into #GUID heap are 4 bytes wide. Bit 2 (0x04) set: Indexes into #Blob heap are 4 bytes wide. If bit not set: indexes into heap is 2 bytes wide.

The remainder bits are undocumented, but exist in the current implementation of the CLR. Bit 4 (0x40) set: Indicates that 4 extra bytes are stored in the tables stream header.

Declaration

public byte HeapSizes { get; set; }

Property Value

Type	Description
System.Byte

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MajorVersion

Major Version.

Declaration

public byte MajorVersion { get; set; }

Property Value

Type	Description
System.Byte

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MaskSorted

Bit mask which shows, which tables are sorted.

Declaration

public ulong MaskSorted { get; set; }

Property Value

Type	Description
System.UInt64

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MaskValid

Bit mask which shows, which tables are present in the .Net assembly. Maximal 64 tables can be present, but most tables are not defined such that the high bits of the mask are always 0.

Declaration

public MaskValidType MaskValid { get; set; }

Property Value

Type	Description
MaskValidType

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MaskValidResolved

MaskValid flags resolved to readable strings.

Declaration

public List<string> MaskValidResolved { get; }

Property Value

Type	Description
List<System.String>

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MinorVersion

Minor Version.

Declaration

public byte MinorVersion { get; set; }

Property Value

Type	Description
System.Byte

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Reserved1

Reserved1, always 0.

Declaration

public uint Reserved1 { get; set; }

Property Value

Type	Description
System.UInt32

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Reserved2

Reserved2, always 1.

Declaration

public byte Reserved2 { get; set; }

Property Value

Type	Description
System.Byte

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TableDefinitions

Access a list of defined tables in the Meta Data Tables Header with the name and number of rows of the table.

Declaration

public List<MetaDataTablesHdr.MetaDataTableInfo> TableDefinitions { get; }

Property Value

Type	Description
List<MetaDataTablesHdr.MetaDataTableInfo>

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Tables

Access all parsed meta data tables.

Declaration

public Tables Tables { get; }

Property Value

Type	Description
Tables

Methods

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ResolveMaskValid(MaskValidType)

Resolve which tables are present in the .Net header based on the MaskValid flags from the MetaDataTablesHdr.

Declaration

public static List<string> ResolveMaskValid(MaskValidType maskValid)

Parameters

Type	Name	Description
MaskValidType	maskValid	MaskValid value from the MetaDataTablesHdr

Returns

Type	Description
List<System.String>	List with present table names.

Implements

IMetaDataTablesHdr