CPDF_FormControl::m_pWidgetDict is never null.

Its callers have all previously de-referenced it prior to passing it
into the constructor.

-- Also remove uncalled GetInteractiveForm() method

Change-Id: Idc954bc54075d72352afc59fc01a2e5a8c738e6a
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/79853
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

core/fpdfdoc/cpdf_formcontrol.cpp

diff --git a/core/fpdfdoc/cpdf_formcontrol.cpp b/core/fpdfdoc/cpdf_formcontrol.cpp
index 42f7e91..d00edc1 100644
--- a/core/fpdfdoc/cpdf_formcontrol.cpp
+++ b/core/fpdfdoc/cpdf_formcontrol.cpp
@@ -40,7 +40,9 @@
                                    CPDF_Dictionary* pWidgetDict)
     : m_pField(pField),
       m_pWidgetDict(pWidgetDict),
-      m_pForm(m_pField->GetForm()) {}
+      m_pForm(m_pField->GetForm()) {
+  DCHECK(m_pWidgetDict);
+}
 
 CPDF_FormControl::~CPDF_FormControl() = default;
 
@@ -125,9 +127,6 @@
 
 CPDF_FormControl::HighlightingMode CPDF_FormControl::GetHighlightingMode()
     const {
-  if (!m_pWidgetDict)
-    return Invert;
-
   ByteString csH = m_pWidgetDict->GetStringFor("H", "I");
   for (size_t i = 0; i < pdfium::size(kHighlightModes); ++i) {
     if (csH == kHighlightModes[i])
@@ -137,8 +136,7 @@
 }
 
 CPDF_ApSettings CPDF_FormControl::GetMK() const {
-  return CPDF_ApSettings(m_pWidgetDict ? m_pWidgetDict->GetDictFor("MK")
-                                       : nullptr);
+  return CPDF_ApSettings(m_pWidgetDict->GetDictFor("MK"));
 }
 
 bool CPDF_FormControl::HasMKEntry(const ByteString& csEntry) const {
@@ -180,9 +178,6 @@
 }
 
 CPDF_DefaultAppearance CPDF_FormControl::GetDefaultAppearance() const {
-  if (!m_pWidgetDict)
-    return CPDF_DefaultAppearance();
-
   if (m_pWidgetDict->KeyExist("DA"))
     return CPDF_DefaultAppearance(m_pWidgetDict->GetStringFor("DA"));
 
@@ -243,8 +238,6 @@
 }
 
 int CPDF_FormControl::GetControlAlignment() const {
-  if (!m_pWidgetDict)
-    return 0;
   if (m_pWidgetDict->KeyExist("Q"))
     return m_pWidgetDict->GetIntegerFor("Q", 0);
 

core/fpdfdoc/cpdf_formcontrol.h

diff --git a/core/fpdfdoc/cpdf_formcontrol.h b/core/fpdfdoc/cpdf_formcontrol.h
index 00fbb78..93422fc 100644
--- a/core/fpdfdoc/cpdf_formcontrol.h
+++ b/core/fpdfdoc/cpdf_formcontrol.h
@@ -39,9 +39,6 @@
   ~CPDF_FormControl();
 
   CPDF_FormField::Type GetType() const { return m_pField->GetType(); }
-  const CPDF_InteractiveForm* GetInteractiveForm() const {
-    return m_pForm.Get();
-  }
   CPDF_FormField* GetField() const { return m_pField.Get(); }
   CPDF_Dictionary* GetWidget() const { return m_pWidgetDict.Get(); }
   CFX_FloatRect GetRect() const;

core/fpdfdoc/cpdf_interactiveform.cpp

diff --git a/core/fpdfdoc/cpdf_interactiveform.cpp b/core/fpdfdoc/cpdf_interactiveform.cpp
index 8d0ad7b..37b3aa8 100644
--- a/core/fpdfdoc/cpdf_interactiveform.cpp
+++ b/core/fpdfdoc/cpdf_interactiveform.cpp
@@ -875,12 +875,8 @@
   if (pKids) {
     for (size_t i = 0; i < pKids->size(); i++) {
       CPDF_Dictionary* pKid = pKids->GetDictAt(i);
-      if (!pKid)
-        continue;
-      if (pKid->GetNameFor("Subtype") != "Widget")
-        continue;
-
-      AddControl(pField, pKid);
+      if (pKid && pKid->GetNameFor("Subtype") == "Widget")
+        AddControl(pField, pKid);
     }
   } else {
     if (pFieldDict->GetNameFor("Subtype") == "Widget")
@@ -891,6 +887,7 @@
 CPDF_FormControl* CPDF_InteractiveForm::AddControl(
     CPDF_FormField* pField,
     CPDF_Dictionary* pWidgetDict) {
+  DCHECK(pWidgetDict);
   const auto it = m_ControlMap.find(pWidgetDict);
   if (it != m_ControlMap.end())
     return it->second.get();