1 files changed, 33 insertions, 0 deletions
diff --git a/src/installer/corehost/cli/apphost/bundle/marker.cpp b/src/installer/corehost/cli/apphost/bundle/marker.cpp
new file mode 100644
index 00000000000..d2302923226
--- /dev/null
+++ b/src/installer/corehost/cli/apphost/bundle/marker.cpp
@@ -0,0 +1,33 @@
+// 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.
+
+#include "marker.h"
+#include "pal.h"
+#include "trace.h"
+#include "utils.h"
+
+using namespace bundle;
+
+int64_t marker_t::header_offset()
+{
+    // Contains the bundle_placeholder default value at compile time.
+    // If this is a single-file bundle, the last 8 bytes are replaced 
+    // bundle-header replaced by "dotnet publish" with the offset 
+    // where the bundle_header is located.
+    static volatile uint8_t placeholder[] = 
+    {
+        // 8 bytes represent the bundle header-offset 
+        // Zero for non-bundle apphosts (default).
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        // 64 bytes represent the bundle signature: SHA-256 for ".net core bundle"
+        0x8b, 0x12, 0x02, 0xb9, 0x6a, 0x61, 0x20, 0x38,
+        0x72, 0x7b, 0x93, 0x02, 0x14, 0xd7, 0xa0, 0x32,
+        0x13, 0xf5, 0xb9, 0xe6, 0xef, 0xae, 0x33, 0x18,
+        0xee, 0x3b, 0x2d, 0xce, 0x24, 0xb3, 0x6a, 0xae
+    };
+
+    volatile marker_t* marker = reinterpret_cast<volatile marker_t *>(placeholder);
+
+    return marker->locator.bundle_header_offset;
+}