Courgette: Add static method QuickDetect() to optimize program detection.

courgette/disassembler_win32.h

Index: courgette/disassembler_win32.h
diff --git a/courgette/disassembler_win32.h b/courgette/disassembler_win32.h
index 42dc2fef3ada8367c6871a1fdf49c9850a68c326..d9d52e4b7e20b629c2ee7c79033f54dd56f12a7d 100644
--- a/courgette/disassembler_win32.h
+++ b/courgette/disassembler_win32.h
@@ -49,12 +49,17 @@ class DisassemblerWin32 : public Disassembler {
   static std::string SectionName(const Section* section);
 
  protected:
+  // Returns 'true' if an valid executable is detected using only quick checks.

[huangs, 2016/06/17 15:21:57]

NIT: true does not need ''
NIT: *a* valid executable.

+  // Derived classes should inject |magic| corresponding to their architecture,
+  // which will be checked against the detected one.
+  static bool QuickDetect(const uint8_t* start, size_t length, uint16_t magic);
+
   // Disassembler interfaces.
   RvaVisitor* CreateAbs32TargetRvaVisitor() override;
   RvaVisitor* CreateRel32TargetRvaVisitor() override;
   void RemoveUnusedRel32Locations(AssemblyProgram* program) override;
 
-  DisassemblerWin32(const void* start, size_t length);
+  DisassemblerWin32(const uint8_t* start, size_t length);
 
   CheckBool ParseFile(AssemblyProgram* target) WARN_UNUSED_RESULT;
   bool ParseAbs32Relocs();