Add proper const/non-const versions of CPDF_Dictionary::GetArrayFor().

BUG=pdfium:234

Change-Id: I5c900aa0547afef0c60de35422b4ee489daa6cfb
Reviewed-on: https://pdfium-review.googlesource.com/32913
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

4 files changed, 13 insertions, 8 deletions

diff --git a/core/fpdfapi/page/cpdf_function.cpp b/core/fpdfapi/page/cpdf_function.cpp
index ad3b666a1f..b9753abeef 100644
--- a/core/fpdfapi/page/cpdf_function.cpp
+++ b/core/fpdfapi/page/cpdf_function.cpp
@@ -100,7 +100,7 @@ bool CPDF_Function::Init(const CPDF_Object* pObj,
       m_pDomains[i] = pDomains->GetFloatAt(i);
   }
 
-  CPDF_Array* pRanges = pDict->GetArrayFor("Range");
+  const CPDF_Array* pRanges = pDict->GetArrayFor("Range");
   m_nOutputs = pRanges ? pRanges->GetCount() / 2 : 0;
 
   // Ranges are required for type 0 and type 4 functions. A non-zero
diff --git a/core/fpdfapi/parser/cpdf_dictionary.cpp b/core/fpdfapi/parser/cpdf_dictionary.cpp
index 0bdb8a8b16..1ede5e707a 100644
--- a/core/fpdfapi/parser/cpdf_dictionary.cpp
+++ b/core/fpdfapi/parser/cpdf_dictionary.cpp
@@ -141,7 +141,11 @@ CPDF_Dictionary* CPDF_Dictionary::GetDictFor(const ByteString& key) const {
   return nullptr;
 }
 
-CPDF_Array* CPDF_Dictionary::GetArrayFor(const ByteString& key) const {
+const CPDF_Array* CPDF_Dictionary::GetArrayFor(const ByteString& key) const {
+  return ToArray(GetDirectObjectFor(key));
+}
+
+CPDF_Array* CPDF_Dictionary::GetArrayFor(const ByteString& key) {
   return ToArray(GetDirectObjectFor(key));
 }
 
@@ -155,7 +159,7 @@ CPDF_Stream* CPDF_Dictionary::GetStreamFor(const ByteString& key) {
 
 CFX_FloatRect CPDF_Dictionary::GetRectFor(const ByteString& key) const {
   CFX_FloatRect rect;
-  CPDF_Array* pArray = GetArrayFor(key);
+  const CPDF_Array* pArray = GetArrayFor(key);
   if (pArray)
     rect = pArray->GetRect();
   return rect;
@@ -163,7 +167,7 @@ CFX_FloatRect CPDF_Dictionary::GetRectFor(const ByteString& key) const {
 
 CFX_Matrix CPDF_Dictionary::GetMatrixFor(const ByteString& key) const {
   CFX_Matrix matrix;
-  CPDF_Array* pArray = GetArrayFor(key);
+  const CPDF_Array* pArray = GetArrayFor(key);
   if (pArray)
     matrix = pArray->GetMatrix();
   return matrix;
diff --git a/core/fpdfapi/parser/cpdf_dictionary.h b/core/fpdfapi/parser/cpdf_dictionary.h
index f2ee588dab..df789aa7b4 100644
--- a/core/fpdfapi/parser/cpdf_dictionary.h
+++ b/core/fpdfapi/parser/cpdf_dictionary.h
@@ -54,7 +54,8 @@ class CPDF_Dictionary : public CPDF_Object {
   CPDF_Dictionary* GetDictFor(const ByteString& key) const;
   const CPDF_Stream* GetStreamFor(const ByteString& key) const;
   CPDF_Stream* GetStreamFor(const ByteString& key);
-  CPDF_Array* GetArrayFor(const ByteString& key) const;
+  const CPDF_Array* GetArrayFor(const ByteString& key) const;
+  CPDF_Array* GetArrayFor(const ByteString& key);
   CFX_FloatRect GetRectFor(const ByteString& key) const;
   CFX_Matrix GetMatrixFor(const ByteString& key) const;
   float GetFloatFor(const ByteString& key) const { return GetNumberFor(key); }
diff --git a/core/fpdfapi/render/cpdf_dibsource.cpp b/core/fpdfapi/render/cpdf_dibsource.cpp
index b2ebc74279..e9de5289a4 100644
--- a/core/fpdfapi/render/cpdf_dibsource.cpp
+++ b/core/fpdfapi/render/cpdf_dibsource.cpp
@@ -359,7 +359,7 @@ bool CPDF_DIBSource::LoadColorInfo(const CPDF_Dictionary* pFormResources,
     }
     m_bImageMask = true;
     m_bpc = m_nComponents = 1;
-    CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
+    const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
     m_bDefaultDecode = !pDecode || !pDecode->GetIntegerAt(0);
     return true;
   }
@@ -398,7 +398,7 @@ bool CPDF_DIBSource::GetDecodeAndMaskArray(bool* bDefaultDecode,
 
   m_CompData.resize(m_nComponents);
   int max_data = (1 << m_bpc) - 1;
-  CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
+  const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
   if (pDecode) {
     for (uint32_t i = 0; i < m_nComponents; i++) {
       m_CompData[i].m_DecodeMin = pDecode->GetNumberAt(i * 2);
@@ -658,7 +658,7 @@ CPDF_DIBSource::LoadState CPDF_DIBSource::StartLoadMask() {
     return m_pMaskStream ? StartLoadMaskDIB() : LoadState::kSuccess;
   }
 
-  CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArrayFor("Matte");
+  const CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArrayFor("Matte");
   if (pMatte && m_pColorSpace && m_Family != PDFCS_PATTERN &&
       m_pColorSpace->CountComponents() <= m_nComponents) {
     std::vector<float> colors(m_nComponents);