Add shared library version of libcli_main

ports/nacl-spawn/elf_reader.h

-// Copyright (c) 2014 The Native Client 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 NACL_SPAWN_ELF_READER_
-#define NACL_SPAWN_ELF_READER_
-
-#include <elf.h>
-#include <stdio.h>
-
-#include <string>
-#include <vector>
-
-// An ELF reader which extracts shared objects which are necessary to
-// run the specified binary (DT_NEEDED). As no NaCl binary in the NaCl
-// SDK does not have DT_RPATH and DT_RUNPATH (as of Jan. 2014), we do
-// not support them.
-class ElfReader {
- public:
-  explicit ElfReader(const char* filename);
-
-  bool is_valid() const { return is_valid_; }
-  bool is_static() const { return is_static_; }
-  Elf64_Half machine() const { return machine_; }
-  const std::vector<std::string>& neededs() const { return neededs_; }
-
- private:
-  bool ReadHeaders(FILE* fp, std::vector<Elf64_Phdr>* phdrs);
-  bool ReadDynamic(FILE* fp, const std::vector<Elf64_Phdr>& phdrs,
-                   Elf64_Addr* straddr, size_t* strsize,
-                   std::vector<int>* neededs);
-  bool ReadStrtab(FILE* fp, const std::vector<Elf64_Phdr>& phdrs,
-                  Elf64_Addr straddr, size_t strsize,
-                  std::string* strtab);
-  void PrintError(const char* fmt, ...);
-
-  const char* filename_;
-  bool is_valid_;
-  bool is_static_;
-  Elf64_Half machine_;
-  unsigned char elf_class_;
-  std::vector<std::string> neededs_;
-};
-
-#endif  // NACL_SPAWN_ELF_READER_