From a0c40d5a1b8537a6338dacc27a88d236077ab785 Mon Sep 17 00:00:00 2001
From: Sean Hall <r.sean.hall@gmail.com>
Date: Sun, 18 Oct 2020 16:01:24 -0500
Subject: Allow unsetting version variables.

---
 src/engine/EngineForApplication.cpp |  7 +++++--
 src/engine/EngineForExtension.cpp   |  7 +++++--
 src/engine/variable.cpp             | 15 +++++++++++----
 src/engine/variant.cpp              | 29 ++++++++++++++++++++++-------
 4 files changed, 43 insertions(+), 15 deletions(-)

(limited to 'src/engine')

diff --git a/src/engine/EngineForApplication.cpp b/src/engine/EngineForApplication.cpp
index c5eb5467..87a0782c 100644
--- a/src/engine/EngineForApplication.cpp
+++ b/src/engine/EngineForApplication.cpp
@@ -583,8 +583,11 @@ static HRESULT BAEngineSetVariableVersion(
 
     if (wzVariable && *wzVariable)
     {
-        hr = VerParseVersion(wzValue, 0, FALSE, &pVersion);
-        ExitOnFailure(hr, "Failed to parse new version value.");
+        if (wzValue)
+        {
+            hr = VerParseVersion(wzValue, 0, FALSE, &pVersion);
+            ExitOnFailure(hr, "Failed to parse new version value.");
+        }
 
         hr = VariableSetVersion(&pContext->pEngineState->variables, wzVariable, pVersion, FALSE);
         ExitOnFailure(hr, "Failed to set version variable.");
diff --git a/src/engine/EngineForExtension.cpp b/src/engine/EngineForExtension.cpp
index c165e2c2..585b74a4 100644
--- a/src/engine/EngineForExtension.cpp
+++ b/src/engine/EngineForExtension.cpp
@@ -273,8 +273,11 @@ static HRESULT BEEngineSetVariableVersion(
 
     if (wzVariable && *wzVariable)
     {
-        hr = VerParseVersion(wzValue, 0, FALSE, &pVersion);
-        ExitOnFailure(hr, "Failed to parse new version value.");
+        if (wzValue)
+        {
+            hr = VerParseVersion(wzValue, 0, FALSE, &pVersion);
+            ExitOnFailure(hr, "Failed to parse new version value.");
+        }
 
         hr = VariableSetVersion(&pContext->pEngineState->variables, wzVariable, pVersion, FALSE);
         ExitOnFailure(hr, "Failed to set version variable.");
diff --git a/src/engine/variable.cpp b/src/engine/variable.cpp
index c2192346..3425b92c 100644
--- a/src/engine/variable.cpp
+++ b/src/engine/variable.cpp
@@ -1551,7 +1551,7 @@ static HRESULT SetVariableValue(
             case BURN_VARIANT_TYPE_NONE:
                 if (BURN_VARIANT_TYPE_NONE != pVariables->rgVariables[iVariable].Value.Type)
                 {
-                    LogStringLine(REPORT_STANDARD, "Unsetting variable '%ls'", wzVariable, pVariant->sczValue);
+                    LogStringLine(REPORT_STANDARD, "Unsetting variable '%ls'", wzVariable);
                 }
                 break;
 
@@ -1563,7 +1563,7 @@ static HRESULT SetVariableValue(
             case BURN_VARIANT_TYPE_STRING:
                 if (!pVariant->sczValue)
                 {
-                    LogStringLine(REPORT_STANDARD, "Unsetting variable '%ls'", wzVariable, pVariant->sczValue);
+                    LogStringLine(REPORT_STANDARD, "Unsetting variable '%ls'", wzVariable);
                 }
                 else
                 {
@@ -1572,7 +1572,14 @@ static HRESULT SetVariableValue(
                 break;
 
             case BURN_VARIANT_TYPE_VERSION:
-                LogStringLine(REPORT_STANDARD, "Setting version variable '%ls' to value '%ls'", wzVariable, pVariant->pValue->sczVersion);
+                if (!pVariant->pValue)
+                {
+                    LogStringLine(REPORT_STANDARD, "Unsetting variable '%ls'", wzVariable);
+                }
+                else
+                {
+                    LogStringLine(REPORT_STANDARD, "Setting version variable '%ls' to value '%ls'", wzVariable, pVariant->pValue->sczVersion);
+                }
                 break;
 
             default:
@@ -1581,7 +1588,7 @@ static HRESULT SetVariableValue(
             }
         }
 
-        if (BURN_VARIANT_TYPE_VERSION == pVariant->Type && pVariant->pValue->fInvalid)
+        if (BURN_VARIANT_TYPE_VERSION == pVariant->Type && pVariant->pValue && pVariant->pValue->fInvalid)
         {
             LogId(REPORT_WARNING, MSG_VARIABLE_INVALID_VERSION, wzVariable);
         }
diff --git a/src/engine/variant.cpp b/src/engine/variant.cpp
index 9fdb82cd..82f465b2 100644
--- a/src/engine/variant.cpp
+++ b/src/engine/variant.cpp
@@ -198,7 +198,14 @@ static HRESULT GetVersionInternal(
     case BURN_VARIANT_TYPE_VERSION:
         BVariantRetrieveVersion(pVariant, &pValue);
 
-        hr = VerCopyVersion(pValue, ppValue);
+        if (!pValue)
+        {
+            *ppValue = NULL;
+        }
+        else
+        {
+            hr = VerCopyVersion(pValue, ppValue);
+        }
         break;
     default:
         hr = E_INVALIDARG;
@@ -275,14 +282,22 @@ extern "C" HRESULT BVariantSetVersion(
     HRESULT hr = S_OK;
     BOOL fEncryptValue = pVariant->fEncryptString;
 
-    if (BURN_VARIANT_TYPE_FORMATTED == pVariant->Type ||
-        BURN_VARIANT_TYPE_STRING == pVariant->Type)
+    if (!pValue) // if we're nulling out the version, make the variable NONE.
     {
-        StrSecureZeroFreeString(pVariant->sczValue);
+        BVariantUninitialize(pVariant);
     }
-    memset(pVariant, 0, sizeof(BURN_VARIANT));
-    hr = VerCopyVersion(pValue, &pVariant->pValue);
-    pVariant->Type = BURN_VARIANT_TYPE_VERSION;
+    else // assign the value.
+    {
+        if (BURN_VARIANT_TYPE_FORMATTED == pVariant->Type ||
+            BURN_VARIANT_TYPE_STRING == pVariant->Type)
+        {
+            StrSecureZeroFreeString(pVariant->sczValue);
+        }
+        memset(pVariant, 0, sizeof(BURN_VARIANT));
+        hr = VerCopyVersion(pValue, &pVariant->pValue);
+        pVariant->Type = BURN_VARIANT_TYPE_VERSION;
+    }
+
     BVariantSetEncryption(pVariant, fEncryptValue);
 
     return hr;
-- 
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