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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Reflection.Metadata;
using System.Reflection.PortableExecutable;
using Internal.TypeSystem;
using Internal.TypeSystem.Ecma;
namespace ILCompiler
{
/// <summary>
/// A resource blocking policy that blocks RESX resources in framework assemblies.
/// This is useful for size-conscious scenarios where the conveniece of having
/// proper exception messages in framework-throw exceptions is not important.
/// </summary>
public sealed class FrameworkStringResourceBlockingPolicy : ManifestResourceBlockingPolicy
{
public override bool IsManifestResourceBlocked(ModuleDesc module, string resourceName)
{
// The embedded RESX files all have names that end with .resources, so use that as the initial filter.
if (!resourceName.EndsWith(".resources", StringComparison.OrdinalIgnoreCase))
return false;
// Assuming multimodule and non-ecma assemblies are unsupported
EcmaModule ecmaModule = (EcmaModule)module;
// If this is not a framework assembly, no resources are blocked
if (!IsFrameworkAssembly(ecmaModule))
return false;
MetadataReader reader = ecmaModule.MetadataReader;
// We have a resource in the framework assembly. Now check if this is a RESX
foreach (ManifestResourceHandle resourceHandle in reader.ManifestResources)
{
ManifestResource resource = reader.GetManifestResource(resourceHandle);
if (reader.StringComparer.Equals(resource.Name, resourceName) &&
resource.Implementation.IsNil)
{
PEMemoryBlock resourceDirectory =
ecmaModule.PEReader.GetSectionData(ecmaModule.PEReader.PEHeaders.CorHeader.ResourcesDirectory.RelativeVirtualAddress);
BlobReader blob = resourceDirectory.GetReader((int)resource.Offset, resourceDirectory.Length - (int)resource.Offset);
int length = (int)blob.ReadUInt32();
if (length > 4)
{
// Check for magic bytes that correspond to RESX
if (blob.ReadUInt32() == 0xBEEFCACE)
return true;
}
}
}
return false;
}
/// <summary>
/// Gets a value indicating whether '<paramref name="module"/>' is a framework assembly.
/// </summary>
private static bool IsFrameworkAssembly(EcmaModule module)
{
MetadataReader reader = module.MetadataReader;
// We look for [assembly:AssemblyMetadata(".NETFrameworkAssembly", "")]
foreach (CustomAttributeHandle attributeHandle in reader.GetAssemblyDefinition().GetCustomAttributes())
{
if (!reader.GetAttributeNamespaceAndName(attributeHandle, out StringHandle namespaceHandle, out StringHandle nameHandle))
continue;
if (!reader.StringComparer.Equals(namespaceHandle, "System.Reflection") ||
!reader.StringComparer.Equals(nameHandle, "AssemblyMetadataAttribute"))
continue;
var attributeTypeProvider = new CustomAttributeTypeProvider(module);
CustomAttribute attribute = reader.GetCustomAttribute(attributeHandle);
CustomAttributeValue<TypeDesc> decodedAttribute = attribute.DecodeValue(attributeTypeProvider);
if (decodedAttribute.FixedArguments.Length != 2)
continue;
if (decodedAttribute.FixedArguments[0].Value is string s && s == ".NETFrameworkAssembly")
return true;
}
return false;
}
}
}
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