Add zero-copy data pointer access for BinaryData objects for API-side container transforms.

Author: bpotchik

binaryninjaapi.h

@@ -5829,6 +5829,18 @@ namespace BinaryNinja {
 		*/
 		DataBuffer ReadBuffer(uint64_t offset, size_t len);
 
+		/*! GetDataPointer returns a pointer to the underlying data for zero-copy access
+
+		    \return pointer to data if available for zero-copy access, nullptr otherwise
+		*/
+		const uint8_t* GetDataPointer() const;
+
+		/*! GetDataLength returns the length of the underlying data
+
+		    \return length of data if available for zero-copy access, 0 otherwise
+		*/
+		size_t GetDataLength() const;
+
 		/*! Write writes `len` bytes data at address `dest` to virtual address `offset`
 
 			\param offset virtual address to write to

binaryninjacore.h

@@ -37,7 +37,7 @@
 // Current ABI version for linking to the core. This is incremented any time
 // there are changes to the API that affect linking, including new functions,
 // new types, or modifications to existing functions or types.
-#define BN_CURRENT_CORE_ABI_VERSION 134
+#define BN_CURRENT_CORE_ABI_VERSION 135
 
 // Minimum ABI version that is supported for loading of plugins. Plugins that
 // are linked to an ABI version less than this will not be able to load and
@@ -4328,6 +4328,8 @@ extern "C"
 
 	BINARYNINJACOREAPI size_t BNReadViewData(BNBinaryView* view, void* dest, uint64_t offset, size_t len);
 	BINARYNINJACOREAPI BNDataBuffer* BNReadViewBuffer(BNBinaryView* view, uint64_t offset, size_t len);
+	BINARYNINJACOREAPI const uint8_t* BNGetViewDataPointer(BNBinaryView* view);
+	BINARYNINJACOREAPI size_t BNGetViewDataLength(BNBinaryView* view);
 
 	BINARYNINJACOREAPI size_t BNWriteViewData(BNBinaryView* view, uint64_t offset, const void* data, size_t len);
 	BINARYNINJACOREAPI size_t BNWriteViewBuffer(BNBinaryView* view, uint64_t offset, BNDataBuffer* data);

binaryview.cpp

@@ -1747,6 +1747,18 @@ DataBuffer BinaryView::ReadBuffer(uint64_t offset, size_t len)
 }
 
 
+const uint8_t* BinaryView::GetDataPointer() const
+{
+	return BNGetViewDataPointer(m_object);
+}
+
+
+size_t BinaryView::GetDataLength() const
+{
+	return BNGetViewDataLength(m_object);
+}
+
+
 size_t BinaryView::WriteBuffer(uint64_t offset, const DataBuffer& data)
 {
 	return BNWriteViewBuffer(m_object, offset, data.GetBufferObject());

view/kernelcache/core/transformers/KernelCacheTransforms.cpp

@@ -41,11 +41,14 @@ class IMG4PayloadTransform : public Transform
         if (!context || !context->GetInput())
             return false;
 
-        // TODO: DataBuffers are not zero-copy, so this is inefficient. Investigate a better way.
-        auto input = context->GetInput()->ReadBuffer(0, context->GetInput()->GetLength());
+        const uint8_t* dataPtr = context->GetInput()->GetDataPointer();
+        size_t dataLength = context->GetInput()->GetDataLength();
+        if (!dataPtr || !dataLength)
+            return false;
+
         DERItem item = {};
-        item.data = (DERByte *)input.GetData();
-        item.length = static_cast<DERSize>(std::min(input.GetLength(), (size_t)std::numeric_limits<DERSize>::max()));
+        item.data = (DERByte *)dataPtr;
+        item.length = static_cast<DERSize>(std::min(dataLength, (size_t)std::numeric_limits<DERSize>::max()));
         Img4Payload payload = {};
         if (auto result = DERImg4DecodePayload(&item, &payload); (result != DR_Success) && (result != DR_DecodeError))
             return false;