1 files changed, 65 insertions, 0 deletions
diff --git a/src/installer/corehost/cli/apphost/bundle/runner.cpp b/src/installer/corehost/cli/apphost/bundle/runner.cpp
new file mode 100644
index 00000000000..50d74235d7a
--- /dev/null
+++ b/src/installer/corehost/cli/apphost/bundle/runner.cpp
@@ -0,0 +1,65 @@
+// 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 <memory>
+#include "extractor.h"
+#include "runner.h"
+#include "trace.h"
+#include "header.h"
+#include "marker.h"
+#include "manifest.h"
+
+using namespace bundle;
+
+void runner_t::map_host()
+{
+    m_bundle_map = (int8_t *) pal::map_file_readonly(m_bundle_path, m_bundle_length);
+
+    if (m_bundle_map == nullptr)
+    {
+        trace::error(_X("Failure processing application bundle."));
+        trace::error(_X("Couldn't memory map the bundle file for reading."));
+        throw StatusCode::BundleExtractionIOError;
+    }
+}
+
+void runner_t::unmap_host()
+{
+    if (!pal::unmap_file(m_bundle_map, m_bundle_length))
+    {
+        trace::warning(_X("Failed to unmap bundle after extraction."));
+    }
+}
+
+// Current support for executing single-file bundles involves 
+// extraction of embedded files to actual files on disk. 
+// This method implements the file extraction functionality at startup.
+StatusCode runner_t::extract()
+{
+    try
+    {
+        map_host();
+        reader_t reader(m_bundle_map, m_bundle_length);
+
+        // Read the bundle header
+        reader.set_offset(marker_t::header_offset());
+        header_t header = header_t::read(reader, /* need_exact_version: */ true);
+
+        // Read the bundle manifest
+        // Reader is at the correct offset
+        manifest_t manifest = manifest_t::read(reader, header.num_embedded_files());
+
+        // Extract the files 
+        extractor_t extractor(header.bundle_id(), m_bundle_path, manifest);
+        m_extraction_dir = extractor.extract(reader);
+
+        unmap_host();
+        return StatusCode::Success;
+    }
+    catch (StatusCode e)
+    {
+        return e;
+    }
+}
+