UnRAR: Allow unpack directly from memory (no files)

deps/unrar/rdwrfn.cpp

@@ -326,3 +326,10 @@ void ComprDataIO::SetUnpackToMemory(byte *Addr,uint Size)
   UnpackToMemoryAddr=Addr;
   UnpackToMemorySize=Size;
 }
+
+void ComprDataIO::SetUnpackFromMemory(byte *Addr,uint Size)
+{
+  UnpackFromMemory=true;
+  UnpackFromMemoryAddr=Addr;
+  UnpackFromMemorySize=Size;
+}

deps/unrar/rdwrfn.hpp

@@ -74,6 +74,7 @@ class ComprDataIO
     void SetAV15Encryption();
     void SetCmt13Encryption();
     void SetUnpackToMemory(byte *Addr,uint Size);
+    void SetUnpackFromMemory(byte *Addr,uint Size);
     void SetCurrentCommand(wchar Cmd) {CurrentCommand=Cmd;}