/// <summary>
/// Gets the index to the provided blob signature. If the signature is not present in the buffer, it will be
/// appended to the end of the stream.
/// </summary>
/// <param name="provider">The object to use for obtaining metadata tokens for members in the tables stream.</param>
/// <param name="signature">The signature to lookup or add.</param>
/// <param name="diagnosticBag">The bag used to collect diagnostic information.</param>
/// <returns>The index of the signature.</returns>
public uint GetBlobIndex(ITypeCodedIndexProvider provider, BlobSignature signature, DiagnosticBag diagnosticBag)
{
if (signature is null)
{
return(0u);
}
// Serialize blob.
using var stream = new MemoryStream();
var writer = new BinaryStreamWriter(stream);
signature.Write(new BlobSerializationContext(writer, provider, diagnosticBag));
return(GetBlobIndex(stream.ToArray()));
}
/// <summary>
/// Gets the index to the provided blob signature. If the signature is not present in the buffer, it will be
/// appended to the end of the stream.
/// </summary>
/// <param name="provider">The object to use for obtaining metadata tokens for members in the tables stream.</param>
/// <param name="signature">The signature to lookup or add.</param>
/// <returns>The index of the signature.</returns>
public uint GetBlobIndex(ITypeCodedIndexProvider provider, BlobSignature signature)
{
if (signature is null)
{
return(0u);
}
// Serialize blob.
using var stream = new MemoryStream();
var writer = new BinaryStreamWriter(stream);
signature.Write(writer, provider);
return(GetBlobIndex(stream.ToArray()));
}
/// <summary>
/// Gets or creates a new index for the given blob signature.
/// </summary>
/// <param name="signature">The blob signature to get the index from.</param>
/// <returns>The index.</returns>
public uint GetBlobOffset(BlobSignature signature)
{
if (signature == null)
{
return(0);
}
if (!_signatureOffsetMapping.TryGetValue(signature, out uint offset))
{
_signatureOffsetMapping.Add(signature, offset = _length);
uint signatureLength = signature.GetPhysicalLength(_parentBuffer);
_length += signatureLength.GetCompressedSize() + signatureLength;
}
return(offset);
}
public void CustomBlobs()
{
var assembly = NetAssemblyFactory.CreateAssembly("SomeAssembly", false);
var header = assembly.NetDirectory.MetadataHeader;
var image = header.LockMetadata();
var importer = new ReferenceImporter(image);
var writeLine = importer.ImportMethod(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }));
var main = new MethodDefinition("Main", MethodAttributes.Public | MethodAttributes.Static,
new MethodSignature(image.TypeSystem.Void));
main.CilMethodBody = new CilMethodBody(main);
main.CilMethodBody.Instructions.AddRange(new[]
{
CilInstruction.Create(CilOpCodes.Ldstr, "Hello, world!"),
CilInstruction.Create(CilOpCodes.Call, writeLine),
CilInstruction.Create(CilOpCodes.Ret)
});
image.Assembly.Modules[0].TopLevelTypes[0].Methods.Add(main);
image.ManagedEntrypoint = main;
var extraBlobs = new BlobSignature[]
{
new DataBlobSignature(new byte[] { 1, 2, 3 }),
new DataBlobSignature(new byte[] { 4, 5, 6 })
};
// Commit changes to assembly
var builder = new CustomBuilder(extraBlobs);
image.Header.UnlockMetadata(builder);
var blobStream = header.GetStream <BlobStream>();
Assert.Equal(new byte[] { 1, 2, 3 }, blobStream.GetBlobByOffset(builder.GetBlobOffset(extraBlobs[0])));
Assert.Equal(new byte[] { 4, 5, 6 }, blobStream.GetBlobByOffset(builder.GetBlobOffset(extraBlobs[1])));
}
public uint GetBlobOffset(BlobSignature signature)
{
return(_extraBlobs[signature]);
}
/// <summary>
/// Wraps a blob signature into a new stand-alone signature.
/// </summary>
/// <param name="signature">The signature to assign a metadata token.</param>
public StandAloneSignature(BlobSignature signature)
: this(new MetadataToken(TableIndex.StandAloneSig, 0))
{
Signature = signature;
}
