typedef uint32_t Elf32_Addr;
typedef uint32_t Elf32_Off;
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Word;
typedef int32_t  Elf32_Sword;

typedef uint64_t Elf64_Addr;
typedef uint64_t Elf64_Off;
typedef uint16_t Elf64_Half;
typedef uint32_t Elf64_Word;
typedef int32_t  Elf64_Sword;

typedef uint64_t Elf64_Xword;
typedef int64_t  Elf64_Sxword;


/** Object file magic string. */
static const char ElfMagic[] = {'\x7f', 'E', 'L', 'F'};

#pragma pack(push,1)

/** 32-bits ELF header */
struct Elf32_Ehdr {
  unsigned char e_ident[16];        /**< ELF Identification bytes */
  Elf32_Half    e_type;             /**< Type of file (see ET_* below) */
  Elf32_Half    e_machine;          /**< Required architecture for this file (see EM_*) */
  Elf32_Word    e_version;          /**< Must be equal to 1 */
  Elf32_Addr    e_entry;            /**< Address to jump to in order to start program */
  Elf32_Off     e_phoff;            /**< Program header table's file offset, in bytes */
  Elf32_Off     e_shoff;            /**< Section header table's file offset, in bytes */
  Elf32_Word    e_flags;            /**< Processor-specific flags */
  Elf32_Half    e_ehsize;           /**< Size of ELF header, in bytes */
  Elf32_Half    e_phentsize;        /**< Size of an entry in the program header table */
  Elf32_Half    e_phnum;            /**< Number of entries in the program header table */
  Elf32_Half    e_shentsize;        /**< Size of an entry in the section header table */
  Elf32_Half    e_shnum;            /**< Number of entries in the section header table */
  Elf32_Half    e_shstrndx;         /**< Sect hdr table index of sect name string table */
};


/**
 * @brief 64-bit ELF header. Fields are the same as for Elf32_Ehdr, but with different
 * types
 * @see Elf32_Ehdr
 */
struct Elf64_Ehdr {
  unsigned char e_ident[16];
  Elf64_Half    e_type;
  Elf64_Half    e_machine;
  Elf64_Word    e_version;
  Elf64_Addr    e_entry;
  Elf64_Off     e_phoff;
  Elf64_Off     e_shoff;
  Elf64_Word    e_flags;
  Elf64_Half    e_ehsize;
  Elf64_Half    e_phentsize;
  Elf64_Half    e_phnum;
  Elf64_Half    e_shentsize;
  Elf64_Half    e_shnum;
  Elf64_Half    e_shstrndx;
};


/** 32-bits Section header. */
struct Elf32_Shdr {
  Elf32_Word sh_name;      /**< Section name (index into string table) */
  Elf32_Word sh_type;      /**< Section type (SHT_*) */
  Elf32_Word sh_flags;     /**< Section flags (SHF_*) */
  Elf32_Addr sh_addr;      /**< Address where section is to be loaded */
  Elf32_Off  sh_offset;    /**< File offset of section data, in bytes */
  Elf32_Word sh_size;      /**< Size of section, in bytes */
  Elf32_Word sh_link;      /**< Section type-specific header table index link */
  Elf32_Word sh_info;      /**< Section type-specific extra information */
  Elf32_Word sh_addralign; /**< Section address alignment */
  Elf32_Word sh_entsize;   /**< Size of records contained within the section */
};

/**
 * 64-bits Section header Section header for ELF64 - same fields as Elf32_Shdr, different types.
 * @see Elf32_Shdr
 */
struct Elf64_Shdr {
  Elf64_Word  sh_name;
  Elf64_Word  sh_type;
  Elf64_Xword sh_flags;
  Elf64_Addr  sh_addr;
  Elf64_Off   sh_offset;
  Elf64_Xword sh_size;
  Elf64_Word  sh_link;
  Elf64_Word  sh_info;
  Elf64_Xword sh_addralign;
  Elf64_Xword sh_entsize;
};


/** Symbol table entries for ELF32. */
struct Elf32_Sym {
  Elf32_Word    st_name;  /**< Symbol name (index into string table) */
  Elf32_Addr    st_value; /**< Value or address associated with the symbol */
  Elf32_Word    st_size;  /**< Size of the symbol */
  unsigned char st_info;  /**< Symbol's type and binding attributes */
  unsigned char st_other; /**< Symbol visibility */
  Elf32_Half    st_shndx; /**< Which section (header table index) it's defined in */
};

/** Symbol table entries for ELF64. */
struct Elf64_Sym {
  Elf64_Word      st_name;  /**< Symbol name (index into string table) */
  unsigned char   st_info;  /**< Symbol's type and binding attributes */
  unsigned char   st_other; /**< Symbol visibility */
  Elf64_Half      st_shndx; /**< Which section (header tbl index) it's defined in */
  Elf64_Addr      st_value; /**< Value or address associated with the symbol */
  Elf64_Xword     st_size;  /**< Size of the symbol */

};

/** @brief Relocation entry, without explicit addend. */
struct Elf32_Rel {
  Elf32_Addr r_offset; /**< Location (file byte offset, or program virtual addr) */
  Elf32_Word r_info;   /**< Symbol table index and type of relocation to apply */
};

/** @brief Relocation entry with explicit addend. */
struct Elf32_Rela {
  Elf32_Addr  r_offset; /**< Location (file byte offset, or program virtual addr) */
  Elf32_Word  r_info;   /**< Symbol table index and type of relocation to apply */
  Elf32_Sword r_addend; /**< Compute value for relocatable field by adding this */
};

/** @brief Relocation entry, without explicit addend. */
struct Elf64_Rel {
  Elf64_Addr r_offset; /**< Location (file byte offset, or program virtual addr). */
  Elf64_Xword r_info;  /**< Symbol table index and type of relocation to apply. */
};

/** @brief Relocation entry with explicit addend. */
struct Elf64_Rela {
  Elf64_Addr  r_offset;  /**< Location (file byte offset, or program virtual addr). */
  Elf64_Xword  r_info;   /**< Symbol table index and type of relocation to apply. */
  Elf64_Sxword r_addend; /**< Compute value for relocatable field by adding this. */
};

/** Program header for ELF32. */
struct Elf32_Phdr {
  Elf32_Word p_type;   /**< Type of segment */
  Elf32_Off  p_offset; /**< File offset where segment is located, in bytes */
  Elf32_Addr p_vaddr;  /**< Virtual address of beginning of segment */
  Elf32_Addr p_paddr;  /**< Physical address of beginning of segment (OS-specific) */
  Elf32_Word p_filesz; /**< Num. of bytes in file image of segment (may be zero) */
  Elf32_Word p_memsz;  /**< Num. of bytes in mem image of segment (may be zero) */
  Elf32_Word p_flags;  /**< Segment flags */
  Elf32_Word p_align;  /**< Segment alignment constraint */
};

/** Program header for ELF64. */
struct Elf64_Phdr {
  Elf64_Word   p_type;   /**< Type of segment */
  Elf64_Word   p_flags;  /**< Segment flags */
  Elf64_Off    p_offset; /**< File offset where segment is located, in bytes */
  Elf64_Addr   p_vaddr;  /**< Virtual address of beginning of segment */
  Elf64_Addr   p_paddr;  /**< Physical addr of beginning of segment (OS-specific) */
  Elf64_Xword  p_filesz; /**< Num. of bytes in file image of segment (may be zero) */
  Elf64_Xword  p_memsz;  /**< Num. of bytes in mem image of segment (may be zero) */
  Elf64_Xword  p_align;  /**< Segment alignment constraint */
};


/** Dynamic table entry for ELF32. */
struct Elf32_Dyn
{
  Elf32_Sword d_tag;          /**< Type of dynamic table entry. */
  union
  {
    Elf32_Word d_val;         /**< Integer value of entry. */
    Elf32_Addr d_ptr;         /**< Pointer value of entry. */
  } d_un;
};

/** Dynamic table entry for ELF64. */
struct Elf64_Dyn
{
  Elf64_Sxword d_tag;         /**< Type of dynamic table entry. */
  union
  {
    Elf64_Xword d_val;        /**< Integer value of entry. */
    Elf64_Addr  d_ptr;        /**< Pointer value of entry. */
  } d_un;
};


struct Elf32_Verneed {
  Elf32_Half    vn_version; /**< Version of structure */
  Elf32_Half    vn_cnt;     /**< Number of associated aux entry */
  Elf32_Word    vn_file;    /**< Offset of filename for this dependency */
  Elf32_Word    vn_aux;     /**< Offset in bytes to vernaux array */
  Elf32_Word    vn_next;    /**< Offset in bytes to next verneed */
} ;

struct Elf64_Verneed {
  Elf64_Half    vn_version; /**< Version of structure */
  Elf64_Half    vn_cnt;     /**< Number of associated aux entry */
  Elf64_Word    vn_file;    /**< Offset of filename for this dependency */
  Elf64_Word    vn_aux;     /**< Offset in bytes to vernaux array */
  Elf64_Word    vn_next;    /**< Offset in bytes to next verneed */
};

struct Elf64_Vernaux {
  Elf64_Word    vna_hash;
  Elf64_Half    vna_flags;
  Elf64_Half    vna_other;
  Elf64_Word    vna_name;
  Elf64_Word    vna_next;
};

struct Elf32_Vernaux {
  Elf32_Word    vna_hash;
  Elf32_Half    vna_flags;
  Elf32_Half    vna_other;
  Elf32_Word    vna_name;
  Elf32_Word    vna_next;
};

struct Elf32_Auxv {
 uint32_t a_type;     /**< Entry type */
 union {
     uint32_t a_val;  /**< Integer value */
   } a_un;
};

struct Elf64_Auxv {
 uint64_t a_type;     /**< Entry type */
 union {
     uint64_t a_val;  /**< Integer value */
   } a_un;
};

/** Structure for .gnu.version_d (64 bits) */
struct Elf64_Verdef {
  Elf64_Half	vd_version;	/**< Version revision */
  Elf64_Half	vd_flags;		/**< Version information */
  Elf64_Half	vd_ndx;			/**< Version Index */
  Elf64_Half	vd_cnt;			/**< Number of associated aux entries */
  Elf64_Word	vd_hash;		/**< Version name hash value */
  Elf64_Word	vd_aux;			/**< Offset in bytes to verdaux array */
  Elf64_Word	vd_next;		/**< Offset in bytes to next verdef entry */
};

/** Structure for .gnu.version_d (32 bits) */
struct Elf32_Verdef {
  Elf32_Half	vd_version;	/**< Version revision */
  Elf32_Half	vd_flags;		/**< Version information */
  Elf32_Half	vd_ndx;			/**< Version Index */
  Elf32_Half	vd_cnt;			/**< Number of associated aux entries */
  Elf32_Word	vd_hash;		/**< Version name hash value */
  Elf32_Word	vd_aux;			/**< Offset in bytes to verdaux array */
  Elf32_Word	vd_next;		/**< Offset in bytes to next verdef entry */
};

struct Elf64_Verdaux
{
  Elf64_Word	vda_name;		/**< Version or dependency names */
  Elf64_Word	vda_next;		/**< Offset in bytes to next verdaux entry */
};

struct Elf32_Verdaux
{
  Elf32_Word	vda_name;		/**< Version or dependency names */
  Elf32_Word	vda_next;		/**< Offset in bytes to next verdaux entry */
};

/** Structure for note type NT_PRPSINFO */
struct Elf64_Prpsinfo
{
  char     pr_state;       /**< Numeric process state */
  char     pr_sname;       /**< Char for pr_state */
  char     pr_zomb;        /**< Process is a zombie */
  char     pr_nice;        /**< Nice value */
  uint32_t pr_pad;
  uint64_t pr_flag;        /**< Process flags */
  uint32_t pr_uid;         /**< Process user ID */
  uint32_t pr_gid;         /**< Process group ID */
  int32_t  pr_pid;         /**< Process ID */
  int32_t  pr_ppid;        /**< Process parent ID */
  int32_t  pr_pgrp;        /**< Process group */
  int32_t  pr_sid;         /**< Process session ID */
  char     pr_fname[16];   /**< Filename of executable */
  char     pr_psargs[80];  /**< Initial part of arg list */
};

struct Elf32_Prpsinfo
{
  char     pr_state;      /**< Numeric process state */
  char     pr_sname;      /**< Char for pr_state */
  char     pr_zomb;       /**< Process is a zombie */
  char     pr_nice;       /**< Nice value */
  uint32_t pr_flag;       /**< Process flags */
  uint16_t pr_uid;        /**< Process user ID */
  uint16_t pr_gid;        /**< Process group ID */
  int32_t  pr_pid;        /**< Process ID */
  int32_t  pr_ppid;       /**< Process parent ID */
  int32_t  pr_pgrp;       /**< Process group */
  int32_t  pr_sid;        /**< Process session ID */
  char     pr_fname[16];  /**< Filename of executable */
  char     pr_psargs[80]; /**< Initial part of arg list */
};

struct Elf_siginfo {
  int32_t si_signo;
  int32_t si_code;
  int32_t si_errno;
};

struct Elf32_timeval {
  uint32_t tv_sec;
  uint32_t tv_usec;
};

struct Elf64_timeval {
  uint64_t tv_sec;
  uint64_t tv_usec;
};

/** Structure for note type NT_PRSTATUS */
struct Elf32_Prstatus {
  Elf_siginfo   pr_info;
  uint16_t      pr_cursig;
  uint16_t      reserved;

  uint32_t      pr_sigpend;
  uint32_t      pr_sighold;

  int32_t       pr_pid;
  int32_t       pr_ppid;
  int32_t       pr_pgrp;
  int32_t       pr_sid;

  Elf32_timeval pr_utime;
  Elf32_timeval pr_stime;
  Elf32_timeval pr_cutime;
  Elf32_timeval pr_cstime;
};

struct Elf64_Prstatus {
  Elf_siginfo   pr_info;
  uint16_t      pr_cursig;
  uint16_t      reserved;

  uint64_t      pr_sigpend;
  uint64_t      pr_sighold;

  int32_t       pr_pid;
  int32_t       pr_ppid;
  int32_t       pr_pgrp;
  int32_t       pr_sid;

  Elf64_timeval pr_utime;
  Elf64_timeval pr_stime;
  Elf64_timeval pr_cutime;
  Elf64_timeval pr_cstime;
};

/** Structure for note type NT_FILE */
struct Elf64_FileEntry
{
  uint64_t start;
  uint64_t end;
  uint64_t file_ofs;
};

struct Elf32_FileEntry
{
  uint32_t start;
  uint32_t end;
  uint32_t file_ofs;
};

#pragma pack(pop)

