Use smart pointers for various Jbig2 decoding contexts

Use unique_ptr for class owned member variables, and remove unnecessary
or unused functions and member variable.

BUG=pdfium:518

Review-Url: https://codereview.chromium.org/2149903002

2 files changed, 16 insertions, 27 deletions

diff --git a/core/fxcodec/codec/ccodec_jbig2module.h b/core/fxcodec/codec/ccodec_jbig2module.h
index 63e63afcfa..5d77d53619 100644
--- a/core/fxcodec/codec/ccodec_jbig2module.h
+++ b/core/fxcodec/codec/ccodec_jbig2module.h
@@ -20,7 +20,7 @@ class IFX_Pause;
 class CCodec_Jbig2Context {
  public:
   CCodec_Jbig2Context();
-  ~CCodec_Jbig2Context() {}
+  ~CCodec_Jbig2Context();
 
   uint32_t m_width;
   uint32_t m_height;
@@ -29,8 +29,7 @@ class CCodec_Jbig2Context {
   uint8_t* m_dest_buf;
   uint32_t m_dest_pitch;
   IFX_Pause* m_pPause;
-  CJBig2_Context* m_pContext;
-  CJBig2_Image* m_dest_image;
+  std::unique_ptr<CJBig2_Context> m_pContext;
 };
 
 class CCodec_Jbig2Module {
@@ -38,7 +37,6 @@ class CCodec_Jbig2Module {
   CCodec_Jbig2Module() {}
   ~CCodec_Jbig2Module();
 
-  CCodec_Jbig2Context* CreateJbig2Context();
   FXCODEC_STATUS StartDecode(CCodec_Jbig2Context* pJbig2Context,
                              std::unique_ptr<CFX_Deletable>* pContextHolder,
                              uint32_t width,
@@ -50,7 +48,6 @@ class CCodec_Jbig2Module {
                              IFX_Pause* pPause);
   FXCODEC_STATUS ContinueDecode(CCodec_Jbig2Context* pJbig2Context,
                                 IFX_Pause* pPause);
-  void DestroyJbig2Context(CCodec_Jbig2Context* pJbig2Context);
 };
 
 #endif  // CORE_FXCODEC_CODEC_CCODEC_JBIG2MODULE_H_
diff --git a/core/fxcodec/codec/fx_codec_jbig.cpp b/core/fxcodec/codec/fx_codec_jbig.cpp
index 4876cef53d..8f2d07f490 100644
--- a/core/fxcodec/codec/fx_codec_jbig.cpp
+++ b/core/fxcodec/codec/fx_codec_jbig.cpp
@@ -37,24 +37,18 @@ JBig2DocumentContext* GetJBig2DocumentContext(
   return static_cast<JBig2DocumentContext*>(pContextHolder->get());
 }
 
-CCodec_Jbig2Context::CCodec_Jbig2Context() {
-  FXSYS_memset(this, 0, sizeof(CCodec_Jbig2Context));
-}
-
-CCodec_Jbig2Module::~CCodec_Jbig2Module() {}
+CCodec_Jbig2Context::CCodec_Jbig2Context()
+    : m_width(0),
+      m_height(0),
+      m_pGlobalStream(nullptr),
+      m_pSrcStream(nullptr),
+      m_dest_buf(0),
+      m_dest_pitch(0),
+      m_pPause(nullptr) {}
 
-CCodec_Jbig2Context* CCodec_Jbig2Module::CreateJbig2Context() {
-  return new CCodec_Jbig2Context();
-}
+CCodec_Jbig2Context::~CCodec_Jbig2Context() {}
 
-void CCodec_Jbig2Module::DestroyJbig2Context(
-    CCodec_Jbig2Context* pJbig2Context) {
-  if (pJbig2Context) {
-    CJBig2_Context::DestroyContext(pJbig2Context->m_pContext);
-    delete pJbig2Context;
-  }
-  pJbig2Context = nullptr;
-}
+CCodec_Jbig2Module::~CCodec_Jbig2Module() {}
 
 FXCODEC_STATUS CCodec_Jbig2Module::StartDecode(
     CCodec_Jbig2Context* pJbig2Context,
@@ -79,9 +73,9 @@ FXCODEC_STATUS CCodec_Jbig2Module::StartDecode(
   pJbig2Context->m_dest_pitch = dest_pitch;
   pJbig2Context->m_pPause = pPause;
   FXSYS_memset(dest_buf, 0, height * dest_pitch);
-  pJbig2Context->m_pContext = CJBig2_Context::CreateContext(
+  pJbig2Context->m_pContext.reset(new CJBig2_Context(
       global_stream, src_stream, pJBig2DocumentContext->GetSymbolDictCache(),
-      pPause);
+      pPause, false));
   if (!pJbig2Context->m_pContext)
     return FXCODEC_STATUS_ERROR;
 
@@ -89,8 +83,7 @@ FXCODEC_STATUS CCodec_Jbig2Module::StartDecode(
                                                     dest_pitch, pPause);
   if (pJbig2Context->m_pContext->GetProcessingStatus() ==
       FXCODEC_STATUS_DECODE_FINISH) {
-    CJBig2_Context::DestroyContext(pJbig2Context->m_pContext);
-    pJbig2Context->m_pContext = nullptr;
+    pJbig2Context->m_pContext.reset();
     if (ret != JBIG2_SUCCESS)
       return FXCODEC_STATUS_ERROR;
 
@@ -111,8 +104,7 @@ FXCODEC_STATUS CCodec_Jbig2Module::ContinueDecode(
       FXCODEC_STATUS_DECODE_FINISH) {
     return pJbig2Context->m_pContext->GetProcessingStatus();
   }
-  CJBig2_Context::DestroyContext(pJbig2Context->m_pContext);
-  pJbig2Context->m_pContext = nullptr;
+  pJbig2Context->m_pContext.reset();
   if (ret != JBIG2_SUCCESS)
     return FXCODEC_STATUS_ERROR;