Make CPDF_Stream() take unique_ptr's to its dictionary.

Review-Url: https://codereview.chromium.org/2520493002

4 files changed, 40 insertions, 23 deletions

diff --git a/core/fpdfapi/parser/cpdf_object_unittest.cpp b/core/fpdfapi/parser/cpdf_object_unittest.cpp
index 86645934bf..303ad6fa7a 100644
--- a/core/fpdfapi/parser/cpdf_object_unittest.cpp
+++ b/core/fpdfapi/parser/cpdf_object_unittest.cpp
@@ -71,10 +71,12 @@ class PDFObjectsTest : public testing::Test {
     size_t buf_len = FX_ArraySize(content);
     uint8_t* buf = reinterpret_cast<uint8_t*>(malloc(buf_len));
     memcpy(buf, content, buf_len);
-    m_StreamDictObj = new CPDF_Dictionary();
+    auto pNewDict = pdfium::MakeUnique<CPDF_Dictionary>();
+    m_StreamDictObj = pNewDict.get();
     m_StreamDictObj->SetNewFor<CPDF_String>("key1", L" test dict");
     m_StreamDictObj->SetNewFor<CPDF_Number>("key2", -1);
-    CPDF_Stream* stream_obj = new CPDF_Stream(buf, buf_len, m_StreamDictObj);
+    CPDF_Stream* stream_obj =
+        new CPDF_Stream(buf, buf_len, std::move(pNewDict));
     // Null Object.
     CPDF_Null* null_obj = new CPDF_Null;
     // All direct objects.
@@ -588,7 +590,8 @@ TEST(PDFArrayTest, GetTypeAt) {
       size_t data_size = FX_ArraySize(content);
       uint8_t* data = reinterpret_cast<uint8_t*>(malloc(data_size));
       memcpy(data, content, data_size);
-      stream_vals[i] = arr->AddNew<CPDF_Stream>(data, data_size, vals[i]);
+      stream_vals[i] = arr->AddNew<CPDF_Stream>(data, data_size,
+                                                pdfium::WrapUnique(vals[i]));
     }
     for (size_t i = 0; i < 3; ++i) {
       TestArrayAccessors(arr.get(), i,     // Array and index.
@@ -633,8 +636,8 @@ TEST(PDFArrayTest, GetTypeAt) {
     size_t buf_size = sizeof(data);
     uint8_t* buf = reinterpret_cast<uint8_t*>(malloc(buf_size));
     memcpy(buf, data, buf_size);
-    CPDF_Stream* stream_val =
-        arr->InsertNewAt<CPDF_Stream>(13, buf, buf_size, stream_dict);
+    CPDF_Stream* stream_val = arr->InsertNewAt<CPDF_Stream>(
+        13, buf, buf_size, pdfium::WrapUnique(stream_dict));
     const char* const expected_str[] = {
         "true",          "false", "0",    "-1234", "2345", "0.05", "",
         "It is a test!", "NAME",  "test", "",      "",     "",     ""};
@@ -816,10 +819,12 @@ TEST(PDFObjectTest, CloneCheckLoop) {
     EXPECT_EQ(nullptr, cloned_dict->AsDictionary()->GetObjectFor("arr"));
   }
   {
-    // Create a dictionary/stream pair with a reference loop.
+    // Create a dictionary/stream pair with a reference loop. It takes
+    // some work to do this nowadays, in particular we need the
+    // anti-pattern pdfium::WrapUnique(dict.get()).
     auto dict_obj = pdfium::MakeUnique<CPDF_Dictionary>();
-    CPDF_Stream* stream_obj =
-        dict_obj->SetNewFor<CPDF_Stream>("stream", nullptr, 0, dict_obj.get());
+    CPDF_Stream* stream_obj = dict_obj->SetNewFor<CPDF_Stream>(
+        "stream", nullptr, 0, pdfium::WrapUnique(dict_obj.get()));
     // Clone this object to see whether stack overflow will be triggered.
     std::unique_ptr<CPDF_Stream> cloned_stream = ToStream(stream_obj->Clone());
     // Cloned object should be the same as the original.
diff --git a/core/fpdfapi/parser/cpdf_stream.cpp b/core/fpdfapi/parser/cpdf_stream.cpp
index fd7f08f688..7a54fcf8ff 100644
--- a/core/fpdfapi/parser/cpdf_stream.cpp
+++ b/core/fpdfapi/parser/cpdf_stream.cpp
@@ -6,6 +6,8 @@
 
 #include "core/fpdfapi/parser/cpdf_stream.h"
 
+#include <utility>
+
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_number.h"
 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
@@ -15,8 +17,10 @@
 
 CPDF_Stream::CPDF_Stream() {}
 
-CPDF_Stream::CPDF_Stream(uint8_t* pData, uint32_t size, CPDF_Dictionary* pDict)
-    : m_dwSize(size), m_pDict(pDict), m_pDataBuf(pData) {}
+CPDF_Stream::CPDF_Stream(uint8_t* pData,
+                         uint32_t size,
+                         std::unique_ptr<CPDF_Dictionary> pDict)
+    : m_dwSize(size), m_pDict(std::move(pDict)), m_pDataBuf(pData) {}
 
 CPDF_Stream::~CPDF_Stream() {
   m_ObjNum = kInvalidObjNum;
@@ -46,8 +50,8 @@ const CPDF_Stream* CPDF_Stream::AsStream() const {
 
 void CPDF_Stream::InitStream(const uint8_t* pData,
                              uint32_t size,
-                             CPDF_Dictionary* pDict) {
-  m_pDict.reset(pDict);
+                             std::unique_ptr<CPDF_Dictionary> pDict) {
+  m_pDict = std::move(pDict);
   m_bMemoryBased = true;
   m_pFile = nullptr;
   m_pDataBuf.reset(FX_Alloc(uint8_t, size));
@@ -59,8 +63,8 @@ void CPDF_Stream::InitStream(const uint8_t* pData,
 }
 
 void CPDF_Stream::InitStreamFromFile(IFX_SeekableReadStream* pFile,
-                                     CPDF_Dictionary* pDict) {
-  m_pDict.reset(pDict);
+                                     std::unique_ptr<CPDF_Dictionary> pDict) {
+  m_pDict = std::move(pDict);
   m_bMemoryBased = false;
   m_pDataBuf.reset();
   m_pFile = pFile;
@@ -79,14 +83,16 @@ std::unique_ptr<CPDF_Object> CPDF_Stream::CloneNonCyclic(
   pVisited->insert(this);
   CPDF_StreamAcc acc;
   acc.LoadAllData(this, true);
+
   uint32_t streamSize = acc.GetSize();
   CPDF_Dictionary* pDict = GetDict();
+  std::unique_ptr<CPDF_Dictionary> pNewDict;
   if (pDict && !pdfium::ContainsKey(*pVisited, pDict)) {
-    pDict = ToDictionary(static_cast<CPDF_Object*>(pDict)
-                             ->CloneNonCyclic(bDirect, pVisited)
-                             .release());
+    pNewDict = ToDictionary(
+        static_cast<CPDF_Object*>(pDict)->CloneNonCyclic(bDirect, pVisited));
   }
-  return pdfium::MakeUnique<CPDF_Stream>(acc.DetachData(), streamSize, pDict);
+  return pdfium::MakeUnique<CPDF_Stream>(acc.DetachData(), streamSize,
+                                         std::move(pNewDict));
 }
 
 void CPDF_Stream::SetData(const uint8_t* pData, uint32_t size) {
diff --git a/core/fpdfapi/parser/cpdf_stream.h b/core/fpdfapi/parser/cpdf_stream.h
index c4f9aacf2b..fb2b67cd82 100644
--- a/core/fpdfapi/parser/cpdf_stream.h
+++ b/core/fpdfapi/parser/cpdf_stream.h
@@ -18,8 +18,11 @@ class CPDF_Stream : public CPDF_Object {
  public:
   CPDF_Stream();
 
-  // Takes ownership of |pData| and |pDict|.
-  CPDF_Stream(uint8_t* pData, uint32_t size, CPDF_Dictionary* pDict);
+  // Takes ownership of |pData|.
+  CPDF_Stream(uint8_t* pData,
+              uint32_t size,
+              std::unique_ptr<CPDF_Dictionary> pDict);
+
   ~CPDF_Stream() override;
 
   // CPDF_Object:
@@ -37,9 +40,11 @@ class CPDF_Stream : public CPDF_Object {
   // Does not takes onwership of |pData|, copies into internally-owned buffer.
   void SetData(const uint8_t* pData, uint32_t size);
 
-  void InitStream(const uint8_t* pData, uint32_t size, CPDF_Dictionary* pDict);
+  void InitStream(const uint8_t* pData,
+                  uint32_t size,
+                  std::unique_ptr<CPDF_Dictionary> pDict);
   void InitStreamFromFile(IFX_SeekableReadStream* pFile,
-                          CPDF_Dictionary* pDict);
+                          std::unique_ptr<CPDF_Dictionary> pDict);
 
   bool ReadRawData(FX_FILESIZE start_pos,
                    uint8_t* pBuf,
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.cpp b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
index 4a0fd3a408..17e4954f2a 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
@@ -752,7 +752,8 @@ std::unique_ptr<CPDF_Stream> CPDF_SyntaxParser::ReadStream(
     }
   }
 
-  auto pStream = pdfium::MakeUnique<CPDF_Stream>(pData, len, pDict);
+  auto pStream =
+      pdfium::MakeUnique<CPDF_Stream>(pData, len, pdfium::WrapUnique(pDict));
   streamStartPos = m_Pos;
   FXSYS_memset(m_WordBuffer, 0, kEndObjStr.GetLength() + 1);
   GetNextWordInternal(nullptr);