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

courgette/disassembler_elf_32.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COURGETTE_DISASSEMBLER_ELF_32_H_
 #define COURGETTE_DISASSEMBLER_ELF_32_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 103 matching lines @@
   virtual CheckBool RelToRVA(Elf32_Rel rel, RVA* result)
     const WARN_UNUSED_RESULT = 0;
 
   // Public for unittests only
   std::vector<RVA>& Abs32Locations() { return abs32_locations_; }
   std::vector<std::unique_ptr<TypedRVA>>& Rel32Locations() {
     return rel32_locations_;
   }
 
  protected:
+  static bool QuickDetects(const uint8_t* start,
+                           size_t length,
+                           e_machine_values elf_em);
+
   bool UpdateLength();
 
   // Misc Section Helpers
 
   Elf32_Half SectionHeaderCount() const {
     return section_header_table_size_;
   }
 
   const Elf32_Shdr* SectionHeader(Elf32_Half id) const {
     assert(id >= 0 && id < SectionHeaderCount());
@@ skipping 81 matching lines @@
 
   std::vector<RVA> abs32_locations_;
   std::vector<std::unique_ptr<TypedRVA>> rel32_locations_;
 
   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32);
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_DISASSEMBLER_ELF_32_H_