Add AssemblyExtensions.TryGetRawMetadata to the System.Reflection.Metadata namespace.

This patch contains has the necessary changes in coreclr and mscorlib. Tests will be added separately, once the new API is
published and can be consumed.

Part of dotnet/corefx#2768

1 files changed, 26 insertions, 0 deletions

diff --git a/src/vm/assemblynative.cpp b/src/vm/assemblynative.cpp
index 40df0068c5..5b4e0c5347 100644
--- a/src/vm/assemblynative.cpp
+++ b/src/vm/assemblynative.cpp
@@ -2614,3 +2614,29 @@ INT_PTR QCALLTYPE AssemblyNative::GetLoadContextForAssembly(QCall::AssemblyHandl
     return ptrManagedAssemblyLoadContext;
 }
 #endif // defined(FEATURE_HOST_ASSEMBLY_RESOLVER)
+
+// static
+BOOL QCALLTYPE AssemblyNative::InternalTryGetRawMetadata(
+    QCall::AssemblyHandle assembly,
+    UINT8 **blobRef,
+    INT32 *lengthRef)
+{
+    QCALL_CONTRACT;
+
+    PTR_CVOID metadata = nullptr;
+
+    BEGIN_QCALL;
+
+    _ASSERTE(assembly != nullptr);
+    _ASSERTE(blobRef != nullptr);
+    _ASSERTE(lengthRef != nullptr);
+
+    static_assert_no_msg(sizeof(*lengthRef) == sizeof(COUNT_T));
+    metadata = assembly->GetFile()->GetLoadedMetadata(reinterpret_cast<COUNT_T *>(lengthRef));
+    *blobRef = reinterpret_cast<UINT8 *>(const_cast<PTR_VOID>(metadata));
+    _ASSERTE(*lengthRef >= 0);
+
+    END_QCALL;
+
+    return metadata != nullptr;
+}