1 files changed, 184 insertions, 0 deletions

diff --git a/src/engine/burnextension.cpp b/src/engine/burnextension.cpp
new file mode 100644
index 00000000..99673cd9
--- /dev/null
+++ b/src/engine/burnextension.cpp
@@ -0,0 +1,184 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+// function definitions
+
+/*******************************************************************
+ BurnExtensionParseFromXml - 
+
+*******************************************************************/
+EXTERN_C HRESULT BurnExtensionParseFromXml(
+    __in BURN_EXTENSIONS* pBurnExtensions,
+    __in BURN_PAYLOADS* pBaPayloads,
+    __in IXMLDOMNode* pixnBundle
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNodeList* pixnNodes = NULL;
+    IXMLDOMNode* pixnNode = NULL;
+    DWORD cNodes = 0;
+
+    // Select BundleExtension nodes.
+    hr = XmlSelectNodes(pixnBundle, L"BundleExtension", &pixnNodes);
+    ExitOnFailure(hr, "Failed to select BundleExtension nodes.");
+
+    // Get BundleExtension node count.
+    hr = pixnNodes->get_length((long*)&cNodes);
+    ExitOnFailure(hr, "Failed to get BundleExtension node count.");
+
+    if (!cNodes)
+    {
+        ExitFunction();
+    }
+
+    // Allocate memory for BundleExtensions.
+    pBurnExtensions->rgExtensions = (BURN_EXTENSION*)MemAlloc(sizeof(BURN_EXTENSION) * cNodes, TRUE);
+    ExitOnNull(pBurnExtensions->rgExtensions, hr, E_OUTOFMEMORY, "Failed to allocate memory for BundleExtension structs.");
+
+    pBurnExtensions->cExtensions = cNodes;
+
+    // parse search elements
+    for (DWORD i = 0; i < cNodes; ++i)
+    {
+        BURN_EXTENSION* pExtension = &pBurnExtensions->rgExtensions[i];
+
+        hr = XmlNextElement(pixnNodes, &pixnNode, NULL);
+        ExitOnFailure(hr, "Failed to get next node.");
+
+        // @Id
+        hr = XmlGetAttributeEx(pixnNode, L"Id", &pExtension->sczId);
+        ExitOnFailure(hr, "Failed to get @Id.");
+
+        // @EntryPayloadId
+        hr = XmlGetAttributeEx(pixnNode, L"EntryPayloadId", &pExtension->sczEntryPayloadId);
+        ExitOnFailure(hr, "Failed to get @EntryPayloadId.");
+
+        hr = PayloadFindById(pBaPayloads, pExtension->sczEntryPayloadId, &pExtension->pEntryPayload);
+        ExitOnFailure(hr, "Failed to find BundleExtension EntryPayload '%ls'.", pExtension->sczEntryPayloadId);
+
+        // prepare next iteration
+        ReleaseNullObject(pixnNode);
+    }
+
+    hr = S_OK;
+
+LExit:
+    ReleaseObject(pixnNode);
+    ReleaseObject(pixnNodes);
+
+    return hr;
+}
+
+/*******************************************************************
+ BurnExtensionUninitialize - 
+
+*******************************************************************/
+EXTERN_C void BurnExtensionUninitialize(
+    __in BURN_EXTENSIONS* pBurnExtensions
+    )
+{
+    if (pBurnExtensions->rgExtensions)
+    {
+        for (DWORD i = 0; i < pBurnExtensions->cExtensions; ++i)
+        {
+            BURN_EXTENSION* pExtension = &pBurnExtensions->rgExtensions[i];
+
+            ReleaseStr(pExtension->sczEntryPayloadId);
+            ReleaseStr(pExtension->sczId);
+        }
+        MemFree(pBurnExtensions->rgExtensions);
+    }
+
+    // clear struct
+    memset(pBurnExtensions, 0, sizeof(BURN_EXTENSIONS));
+}
+
+/*******************************************************************
+ BurnExtensionLoad - 
+
+*******************************************************************/
+EXTERN_C HRESULT BurnExtensionLoad(
+    __in BURN_EXTENSIONS * pBurnExtensions,
+    __in BURN_EXTENSION_ENGINE_CONTEXT* pEngineContext
+    )
+{
+    HRESULT hr = S_OK;
+    BUNDLE_EXTENSION_CREATE_ARGS args = { };
+    BUNDLE_EXTENSION_CREATE_RESULTS results = { };
+
+    if (!pBurnExtensions->rgExtensions || !pBurnExtensions->cExtensions)
+    {
+        ExitFunction();
+    }
+
+    for (DWORD i = 0; i < pBurnExtensions->cExtensions; ++i)
+    {
+        BURN_EXTENSION* pExtension = &pBurnExtensions->rgExtensions[i];
+
+        memset(&args, 0, sizeof(BUNDLE_EXTENSION_CREATE_ARGS));
+        memset(&results, 0, sizeof(BUNDLE_EXTENSION_CREATE_RESULTS));
+
+        args.cbSize = sizeof(BUNDLE_EXTENSION_CREATE_ARGS);
+        args.pfnBundleExtensionEngineProc = EngineForExtensionProc;
+        args.pvBundleExtensionEngineProcContext = pEngineContext;
+        args.qwEngineAPIVersion = MAKEQWORDVERSION(0, 0, 0, 1); // TODO: need to decide whether to keep this, and if so when to update it.
+
+        results.cbSize = sizeof(BUNDLE_EXTENSION_CREATE_RESULTS);
+
+        // Load BundleExtension DLL.
+        pExtension->hBextModule = ::LoadLibraryExW(pExtension->pEntryPayload->sczLocalFilePath, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+        ExitOnNullWithLastError(pExtension->hBextModule, hr, "Failed to load BundleExtension DLL '%ls': '%ls'.", pExtension->sczId, pExtension->pEntryPayload->sczLocalFilePath);
+
+        // Get BundleExtensionCreate entry-point.
+        PFN_BUNDLE_EXTENSION_CREATE pfnCreate = (PFN_BUNDLE_EXTENSION_CREATE)::GetProcAddress(pExtension->hBextModule, "BundleExtensionCreate");
+        ExitOnNullWithLastError(pfnCreate, hr, "Failed to get BundleExtensionCreate entry-point '%ls'.", pExtension->sczId);
+
+        // Create BundleExtension.
+        hr = pfnCreate(&args, &results);
+        ExitOnFailure(hr, "Failed to create BundleExtension '%ls'.", pExtension->sczId);
+
+        pExtension->pfnBurnExtensionProc = results.pfnBundleExtensionProc;
+        pExtension->pvBurnExtensionProcContext = results.pvBundleExtensionProcContext;
+    }
+
+LExit:
+    return hr;
+}
+
+/*******************************************************************
+ BurnExtensionUnload - 
+
+*******************************************************************/
+EXTERN_C void BurnExtensionUnload(
+    __in BURN_EXTENSIONS * pBurnExtensions
+    )
+{
+    HRESULT hr = S_OK;
+
+    if (pBurnExtensions->rgExtensions)
+    {
+        for (DWORD i = 0; i < pBurnExtensions->cExtensions; ++i)
+        {
+            BURN_EXTENSION* pExtension = &pBurnExtensions->rgExtensions[i];
+
+            if (pExtension->hBextModule)
+            {
+                // Get BundleExtensionDestroy entry-point and call it if it exists.
+                PFN_BUNDLE_EXTENSION_DESTROY pfnDestroy = (PFN_BUNDLE_EXTENSION_DESTROY)::GetProcAddress(pExtension->hBextModule, "BundleExtensionDestroy");
+                if (pfnDestroy)
+                {
+                    pfnDestroy();
+                }
+
+                // Free BundleExtension DLL.
+                if (!::FreeLibrary(pExtension->hBextModule))
+                {
+                    hr = HRESULT_FROM_WIN32(::GetLastError());
+                    TraceError(hr, "Failed to unload BundleExtension DLL.");
+                }
+                pExtension->hBextModule = NULL;
+            }
+        }
+    }
+}