From 20a909e655147e21f966b95af6b683d85736c8c2 Mon Sep 17 00:00:00 2001
From: Lei Zhang <thestig@chromium.org>
Date: Tue, 4 Apr 2017 15:27:21 -0700
Subject: Remove a couple checks for MakeUnique failures.
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Combine some common CCodec_Jbig2Module code.

Change-Id: I9a046314bc0e9dddc9a8c1a06b37764e9f3cc4b6
Reviewed-on: https://pdfium-review.googlesource.com/3713
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>
---
 core/fpdfapi/parser/cpdf_parser.cpp     | 12 ++++--------
 core/fxcodec/codec/ccodec_jbig2module.h |  3 +++
 core/fxcodec/codec/fx_codec_jbig.cpp    | 34 ++++++++++++---------------------
 core/fxcodec/jbig2/JBig2_Context.h      |  2 +-
 4 files changed, 20 insertions(+), 31 deletions(-)

diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index 20e9418904..ecdeeacb19 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -240,17 +240,13 @@ CPDF_Parser::Error CPDF_Parser::SetEncryptHandler() {
 
   if (m_pEncryptDict) {
     CFX_ByteString filter = m_pEncryptDict->GetStringFor("Filter");
-    std::unique_ptr<CPDF_SecurityHandler> pSecurityHandler;
-    Error err = HANDLER_ERROR;
-    if (filter == "Standard") {
-      pSecurityHandler = pdfium::MakeUnique<CPDF_SecurityHandler>();
-      err = PASSWORD_ERROR;
-    }
-    if (!pSecurityHandler)
+    if (filter != "Standard")
       return HANDLER_ERROR;
 
+    std::unique_ptr<CPDF_SecurityHandler> pSecurityHandler =
+        pdfium::MakeUnique<CPDF_SecurityHandler>();
     if (!pSecurityHandler->OnInit(this, m_pEncryptDict))
-      return err;
+      return PASSWORD_ERROR;
 
     m_pSecurityHandler = std::move(pSecurityHandler);
     std::unique_ptr<CPDF_CryptoHandler> pCryptoHandler(
diff --git a/core/fxcodec/codec/ccodec_jbig2module.h b/core/fxcodec/codec/ccodec_jbig2module.h
index e4e0af35da..43abe042f0 100644
--- a/core/fxcodec/codec/ccodec_jbig2module.h
+++ b/core/fxcodec/codec/ccodec_jbig2module.h
@@ -50,6 +50,9 @@ class CCodec_Jbig2Module {
       IFX_Pause* pPause);
   FXCODEC_STATUS ContinueDecode(CCodec_Jbig2Context* pJbig2Context,
                                 IFX_Pause* pPause);
+
+ private:
+  FXCODEC_STATUS Decode(CCodec_Jbig2Context* pJbig2Context, int result);
 };
 
 #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 951fec4813..7df87e981f 100644
--- a/core/fxcodec/codec/fx_codec_jbig.cpp
+++ b/core/fxcodec/codec/fx_codec_jbig.cpp
@@ -66,40 +66,30 @@ FXCODEC_STATUS CCodec_Jbig2Module::StartDecode(
   pJbig2Context->m_pContext = pdfium::MakeUnique<CJBig2_Context>(
       global_stream, src_stream, pJBig2DocumentContext->GetSymbolDictCache(),
       pPause, false);
-  if (!pJbig2Context->m_pContext)
-    return FXCODEC_STATUS_ERROR;
-
   int ret = pJbig2Context->m_pContext->getFirstPage(dest_buf, width, height,
                                                     dest_pitch, pPause);
-  if (pJbig2Context->m_pContext->GetProcessingStatus() ==
-      FXCODEC_STATUS_DECODE_FINISH) {
-    pJbig2Context->m_pContext.reset();
-    if (ret != JBIG2_SUCCESS)
-      return FXCODEC_STATUS_ERROR;
-
-    int dword_size = height * dest_pitch / 4;
-    uint32_t* dword_buf = (uint32_t*)dest_buf;
-    for (int i = 0; i < dword_size; i++)
-      dword_buf[i] = ~dword_buf[i];
-    return FXCODEC_STATUS_DECODE_FINISH;
-  }
-  return pJbig2Context->m_pContext->GetProcessingStatus();
+  return Decode(pJbig2Context, ret);
 }
 
 FXCODEC_STATUS CCodec_Jbig2Module::ContinueDecode(
     CCodec_Jbig2Context* pJbig2Context,
     IFX_Pause* pPause) {
   int ret = pJbig2Context->m_pContext->Continue(pPause);
-  if (pJbig2Context->m_pContext->GetProcessingStatus() !=
-      FXCODEC_STATUS_DECODE_FINISH) {
-    return pJbig2Context->m_pContext->GetProcessingStatus();
-  }
+  return Decode(pJbig2Context, ret);
+}
+
+FXCODEC_STATUS CCodec_Jbig2Module::Decode(CCodec_Jbig2Context* pJbig2Context,
+                                          int result) {
+  FXCODEC_STATUS status = pJbig2Context->m_pContext->GetProcessingStatus();
+  if (status != FXCODEC_STATUS_DECODE_FINISH)
+    return status;
+
   pJbig2Context->m_pContext.reset();
-  if (ret != JBIG2_SUCCESS)
+  if (result != JBIG2_SUCCESS)
     return FXCODEC_STATUS_ERROR;
 
   int dword_size = pJbig2Context->m_height * pJbig2Context->m_dest_pitch / 4;
-  uint32_t* dword_buf = (uint32_t*)pJbig2Context->m_dest_buf;
+  uint32_t* dword_buf = reinterpret_cast<uint32_t*>(pJbig2Context->m_dest_buf);
   for (int i = 0; i < dword_size; i++)
     dword_buf[i] = ~dword_buf[i];
   return FXCODEC_STATUS_DECODE_FINISH;
diff --git a/core/fxcodec/jbig2/JBig2_Context.h b/core/fxcodec/jbig2/JBig2_Context.h
index 31865d4d46..a9fb1e2451 100644
--- a/core/fxcodec/jbig2/JBig2_Context.h
+++ b/core/fxcodec/jbig2/JBig2_Context.h
@@ -54,7 +54,7 @@ class CJBig2_Context {
                        IFX_Pause* pPause);
 
   int32_t Continue(IFX_Pause* pPause);
-  FXCODEC_STATUS GetProcessingStatus() { return m_ProcessingStatus; }
+  FXCODEC_STATUS GetProcessingStatus() const { return m_ProcessingStatus; }
 
  private:
   int32_t decode_SquentialOrgnazation(IFX_Pause* pPause);
-- 
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