get rid of -fanalyzer memory leaks

Don't use make_shared inside a function. Instead, change constructor to
value to have std::move.

Also move shared_ptrs everywhere. It's fairly expensive to copy.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/tiffcomposite_int.cpp

@@ -212,16 +212,16 @@ int TiffEntryBase::idx() const {
   return idx_;
 }
 
-void TiffEntryBase::setData(const std::shared_ptr<DataBuf>& buf) {
+void TiffEntryBase::setData(std::shared_ptr<DataBuf> buf) {
-  storage_ = buf;
+  storage_ = std::move(buf);
-  pData_ = buf->data();
+  pData_ = storage_->data();
-  size_ = buf->size();
+  size_ = storage_->size();
 }
 
-void TiffEntryBase::setData(byte* pData, size_t size, const std::shared_ptr<DataBuf>& storage) {
+void TiffEntryBase::setData(byte* pData, size_t size, std::shared_ptr<DataBuf> storage) {
   pData_ = pData;
   size_ = size;
-  storage_ = storage;
+  storage_ = std::move(storage);
   if (!pData_)
     size_ = 0;
 }
@@ -231,7 +231,8 @@ void TiffEntryBase::updateValue(Value::UniquePtr value, ByteOrder byteOrder) {
     return;
   size_t newSize = value->size();
   if (newSize > size_) {
-    setData(std::make_shared<DataBuf>(newSize));
+    auto d = std::make_shared<DataBuf>(newSize);
+    setData(std::move(d));
   }
   if (pData_) {
     memset(pData_, 0x0, size_);
@@ -431,7 +432,8 @@ size_t TiffBinaryArray::addElement(size_t idx, const ArrayDef& def) {
   // The assertion typically fails if a component is not configured in
   // the TIFF structure table (TiffCreator::tiffTreeStruct_)
   tp->setStart(pData() + idx);
-  tp->setData(const_cast<byte*>(pData() + idx), sz, storage());
+  auto s = storage();
+  tp->setData(const_cast<byte*>(pData() + idx), sz, std::move(s));
   tp->setElDef(def);
   tp->setElByteOrder(cfg()->byteOrder_);
   addChild(std::move(tc));

src/tiffcomposite_int.hpp

@@ -428,13 +428,13 @@ class TiffEntryBase : public TiffComponent {
                    you should pass std::shared_ptr<DataBuf>(), which is essentially
                    a nullptr.
    */
-  void setData(byte* pData, size_t size, const std::shared_ptr<DataBuf>& storage);
+  void setData(byte* pData, size_t size, std::shared_ptr<DataBuf> storage);
   /*!
     @brief Set the entry's data buffer. A shared_ptr is used to manage the DataBuf
            because TiffEntryBase has a clone method so it is possible (in theory) for
            the DataBuf to have multiple owners.
    */
-  void setData(const std::shared_ptr<DataBuf>& buf);
+  void setData(std::shared_ptr<DataBuf> buf);
   /*!
    @brief Update the value. Takes ownership of the pointer passed in.
 
@@ -534,7 +534,7 @@ class TiffEntryBase : public TiffComponent {
   static size_t writeOffset(byte* buf, size_t offset, TiffType tiffType, ByteOrder byteOrder);
 
   //! Used (internally) to create another reference to the DataBuf reference by storage_.
-  [[nodiscard]] const std::shared_ptr<DataBuf>& storage() const {
+  [[nodiscard]] std::shared_ptr<DataBuf> storage() const {
     return storage_;
   }
 

src/tiffvisitor_int.cpp

@@ -1329,7 +1329,8 @@ void TiffReader::readTiffEntry(TiffEntryBase* object) {
     v->read(pData, size, byteOrder());
 
     object->setValue(std::move(v));
-    object->setData(pData, size, std::make_shared<DataBuf>());
+    auto d = std::make_shared<DataBuf>();
+    object->setData(pData, size, std::move(d));
     object->setOffset(offset);
     object->setIdx(nextIdx(object->group()));
   } catch (std::overflow_error&) {
@@ -1374,7 +1375,7 @@ void TiffReader::visitBinaryArray(TiffBinaryArray* object) {
     size_t size = object->TiffEntryBase::doSize();
     auto buf = std::make_shared<DataBuf>(cryptFct(object->tag(), pData, size, pRoot_));
     if (!buf->empty())
-      object->setData(buf);
+      object->setData(std::move(buf));
   }
 
   const ArrayDef* defs = object->def();