Encapsulate CPDF_StreamAcc::LoadAllData().

Make it a private method, and add public methods so only limited
combinations of LoadAllData() arguments are possible.

Change-Id: I8c2220eb0e95012350858876586f7c470c40a7c3
Reviewed-on: https://pdfium-review.googlesource.com/42590
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

4 files changed, 21 insertions, 4 deletions

diff --git a/core/fpdfapi/page/cpdf_docpagedata.cpp b/core/fpdfapi/page/cpdf_docpagedata.cpp
index 6744e0f6a7..9ee8d588e4 100644
--- a/core/fpdfapi/page/cpdf_docpagedata.cpp
+++ b/core/fpdfapi/page/cpdf_docpagedata.cpp
@@ -470,7 +470,7 @@ RetainPtr<CPDF_StreamAcc> CPDF_DocPageData::GetFontFileStreamAcc(
   org_size = std::max(org_size, 0);
 
   auto pFontAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pFontStream);
-  pFontAcc->LoadAllData(false, org_size, false);
+  pFontAcc->LoadAllDataFilteredWithEstimatedSize(org_size);
   m_FontFileMap[pFontStream] = pFontAcc;
   return pFontAcc;
 }
diff --git a/core/fpdfapi/parser/cpdf_stream_acc.cpp b/core/fpdfapi/parser/cpdf_stream_acc.cpp
index 1083e3177e..78bcb57e0b 100644
--- a/core/fpdfapi/parser/cpdf_stream_acc.cpp
+++ b/core/fpdfapi/parser/cpdf_stream_acc.cpp
@@ -20,6 +20,11 @@ CPDF_StreamAcc::~CPDF_StreamAcc() {
 void CPDF_StreamAcc::LoadAllData(bool bRawAccess,
                                  uint32_t estimated_size,
                                  bool bImageAcc) {
+  if (bRawAccess) {
+    ASSERT(!estimated_size);
+    ASSERT(!bImageAcc);
+  }
+
   if (!m_pStream)
     return;
 
@@ -63,6 +68,15 @@ void CPDF_StreamAcc::LoadAllDataFiltered() {
   LoadAllData(false, 0, false);
 }
 
+void CPDF_StreamAcc::LoadAllDataFilteredWithEstimatedSize(
+    uint32_t estimated_size) {
+  LoadAllData(false, estimated_size, false);
+}
+
+void CPDF_StreamAcc::LoadAllDataImageAcc(uint32_t estimated_size) {
+  LoadAllData(false, estimated_size, true);
+}
+
 void CPDF_StreamAcc::LoadAllDataRaw() {
   LoadAllData(true, 0, false);
 }
diff --git a/core/fpdfapi/parser/cpdf_stream_acc.h b/core/fpdfapi/parser/cpdf_stream_acc.h
index fae8ba0516..3c42639828 100644
--- a/core/fpdfapi/parser/cpdf_stream_acc.h
+++ b/core/fpdfapi/parser/cpdf_stream_acc.h
@@ -24,8 +24,9 @@ class CPDF_StreamAcc final : public Retainable {
   CPDF_StreamAcc(const CPDF_StreamAcc&) = delete;
   CPDF_StreamAcc& operator=(const CPDF_StreamAcc&) = delete;
 
-  void LoadAllData(bool bRawAccess, uint32_t estimated_size, bool bImageAcc);
   void LoadAllDataFiltered();
+  void LoadAllDataFilteredWithEstimatedSize(uint32_t estimated_size);
+  void LoadAllDataImageAcc(uint32_t estimated_size);
   void LoadAllDataRaw();
 
   const CPDF_Stream* GetStream() const { return m_pStream.Get(); }
@@ -44,6 +45,8 @@ class CPDF_StreamAcc final : public Retainable {
   explicit CPDF_StreamAcc(const CPDF_Stream* pStream);
   ~CPDF_StreamAcc() override;
 
+  void LoadAllData(bool bRawAccess, uint32_t estimated_size, bool bImageAcc);
+
  private:
   uint8_t* m_pData = nullptr;
   uint32_t m_dwSize = 0;
diff --git a/core/fpdfapi/render/cpdf_dibbase.cpp b/core/fpdfapi/render/cpdf_dibbase.cpp
index a37a0aecd5..d342a99ae0 100644
--- a/core/fpdfapi/render/cpdf_dibbase.cpp
+++ b/core/fpdfapi/render/cpdf_dibbase.cpp
@@ -143,7 +143,7 @@ bool CPDF_DIBBase::Load(CPDF_Document* pDoc, const CPDF_Stream* pStream) {
     return false;
 
   m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
-  m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
+  m_pStreamAcc->LoadAllDataImageAcc(src_size.ValueOrDie());
   if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
     return false;
 
@@ -256,7 +256,7 @@ CPDF_DIBBase::LoadState CPDF_DIBBase::StartLoadDIBBase(
     return LoadState::kFail;
 
   m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
-  m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
+  m_pStreamAcc->LoadAllDataImageAcc(src_size.ValueOrDie());
   if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
     return LoadState::kFail;