6 files changed, 37 insertions, 0 deletions

diff --git a/src/api/burn/balutil/inc/BAFunctions.h b/src/api/burn/balutil/inc/BAFunctions.h
index f772eb3f..58c26166 100644
--- a/src/api/burn/balutil/inc/BAFunctions.h
+++ b/src/api/burn/balutil/inc/BAFunctions.h
@@ -90,6 +90,7 @@ enum BA_FUNCTIONS_MESSAGE
     BA_FUNCTIONS_MESSAGE_ONPLANNEDCOMPATIBLEPACKAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANNEDCOMPATIBLEPACKAGE,
     BA_FUNCTIONS_MESSAGE_ONPLANRESTORERELATEDBUNDLE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRESTORERELATEDBUNDLE,
     BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLETYPE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLETYPE,
+    BA_FUNCTIONS_MESSAGE_ONAPPLYDOWNGRADE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYDOWNGRADE,
 
     BA_FUNCTIONS_MESSAGE_ONTHEMELOADED = 1024,
     BA_FUNCTIONS_MESSAGE_WNDPROC,
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctions.h b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
index f558828f..fe5c99ba 100644
--- a/src/api/burn/balutil/inc/BalBaseBAFunctions.h
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
@@ -869,6 +869,14 @@ public: // IBootstrapperApplication
         return S_OK;
     }
 
+    virtual STDMETHODIMP OnApplyDowngrade(
+        __in HRESULT /*hrRecommended*/,
+        __in HRESULT* /*phrStatus*/
+        )
+    {
+        return S_OK;
+    }
+
 public: // IBAFunctions
     virtual STDMETHODIMP OnPlan(
         )
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
index ede00f28..100e5c30 100644
--- a/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
@@ -161,6 +161,7 @@ static HRESULT WINAPI BalBaseBAFunctionsProc(
         case BA_FUNCTIONS_MESSAGE_ONPLANNEDCOMPATIBLEPACKAGE:
         case BA_FUNCTIONS_MESSAGE_ONPLANRESTORERELATEDBUNDLE:
         case BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLETYPE:
+        case BA_FUNCTIONS_MESSAGE_ONAPPLYDOWNGRADE:
             hr = BalBaseBootstrapperApplicationProc((BOOTSTRAPPER_APPLICATION_MESSAGE)message, pvArgs, pvResults, pvContext);
             break;
         case BA_FUNCTIONS_MESSAGE_ONTHEMELOADED:
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
index 49f4b7ca..fd06a83f 100644
--- a/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
@@ -1069,6 +1069,14 @@ public: // IBootstrapperApplication
         return S_OK;
     }
 
+    virtual STDMETHODIMP OnApplyDowngrade(
+        __in HRESULT /*hrRecommended*/,
+        __in HRESULT* /*phrStatus*/
+        )
+    {
+        return S_OK;
+    }
+
 public: //CBalBaseBootstrapperApplication
     virtual STDMETHODIMP Initialize(
         __in const BOOTSTRAPPER_CREATE_ARGS* pCreateArgs
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
index 698349f7..4e413e4e 100644
--- a/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
@@ -738,6 +738,15 @@ static HRESULT BalBaseBAProcOnPlanRelatedBundleType(
     return pBA->OnPlanRelatedBundleType(pArgs->wzBundleId, pArgs->recommendedType, &pResults->requestedType, &pResults->fCancel);
 }
 
+static HRESULT BalBaseBAProcOnApplyDowngrade(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONAPPLYDOWNGRADE_ARGS* pArgs,
+    __inout BA_ONAPPLYDOWNGRADE_RESULTS* pResults
+    )
+{
+    return pBA->OnApplyDowngrade(pArgs->hrRecommended, &pResults->hrStatus);
+}
+
 /*******************************************************************
 BalBaseBootstrapperApplicationProc - requires pvContext to be of type IBootstrapperApplication.
                                      Provides a default mapping between the new message based BA interface and
@@ -1000,6 +1009,9 @@ static HRESULT WINAPI BalBaseBootstrapperApplicationProc(
         case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLETYPE:
             hr = BalBaseBAProcOnPlanRelatedBundleType(pBA, reinterpret_cast<BA_ONPLANRELATEDBUNDLETYPE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANRELATEDBUNDLETYPE_RESULTS*>(pvResults));
             break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYDOWNGRADE:
+            hr = BalBaseBAProcOnApplyDowngrade(pBA, reinterpret_cast<BA_ONAPPLYDOWNGRADE_ARGS*>(pvArgs), reinterpret_cast<BA_ONAPPLYDOWNGRADE_RESULTS*>(pvResults));
+            break;
         }
     }
 
diff --git a/src/api/burn/balutil/inc/IBootstrapperApplication.h b/src/api/burn/balutil/inc/IBootstrapperApplication.h
index 462df0cc..c9cf3126 100644
--- a/src/api/burn/balutil/inc/IBootstrapperApplication.h
+++ b/src/api/burn/balutil/inc/IBootstrapperApplication.h
@@ -707,4 +707,11 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
         __inout BOOTSTRAPPER_RELATED_BUNDLE_PLAN_TYPE* pRequestedType,
         __inout BOOL* pfCancel
         ) = 0;
+
+    // OnApplyDowngrade - called when the plan determined that nothing should happen to prevent downgrading.
+    //
+    STDMETHOD(OnApplyDowngrade)(
+        __in HRESULT hrRecommended,
+        __inout HRESULT* phrStatus
+        ) = 0;
 };