Add DecodeWithContext to LZFSETransform.

Author: bpotchik

view/kernelcache/core/transformers/KernelCacheTransforms.cpp

@@ -248,6 +248,40 @@ class LZFSETransform : public Transform
         return false;
     }
 
+
+    virtual bool DecodeWithContext(Ref<TransformContext> context, const std::map<std::string, DataBuffer>& params) override
+    {
+        if (!context || !context->GetInput())
+            return false;
+
+        const uint8_t* dataPtr = context->GetInput()->GetDataPointer();
+        size_t dataLength = context->GetInput()->GetDataLength();
+        if (!dataPtr || !dataLength)
+            return false;
+
+        size_t outputBufferSize = dataLength * 6;
+        std::unique_ptr<uint8_t[]> scratchBuffer(new uint8_t[lzfse_decode_scratch_size()]);
+        while (true)
+        {
+            DataBuffer output(outputBufferSize);
+            size_t outSize = lzfse_decode_buffer((uint8_t *)output.GetData(), outputBufferSize, (uint8_t *)dataPtr, dataLength, scratchBuffer.get());
+            if (!outSize)
+                return false;
+            if ((outSize > 0) && (outSize < outputBufferSize))
+            {
+                output.SetSize(outSize);
+                context->SetChild(output, "");
+                return true;
+            }
+            if (output.GetLength() > (size_t(1) << 33)) // 8GB max
+                return false;
+            outputBufferSize *= 2;
+        }
+
+        return false;
+    }
+
+
     virtual bool Encode(const DataBuffer& input, DataBuffer& output, const std::map<std::string, DataBuffer>&) override
     {
         size_t outputBufferSize = input.GetLength() + (input.GetLength() / 16) + 64;