How to use the esptool.ELFFile function in esptool

raise FatalError("Only read 0x%x bytes from section header (expected 0x%x.) Truncated ELF file?" % (len(section_header), len_bytes))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), self.LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,_flags,lma,sec_offs,size = struct.unpack_from("

raise FatalError("Only read 0x%x bytes from section header (expected 0x%x.) Truncated ELF file?" % (len(section_header), len_bytes))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), self.LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,_flags,lma,sec_offs,size = struct.unpack_from(" 0]

def wrap_stub(elf_file):
    """ Wrap an ELF file into a stub 'dict' """
    print('Wrapping ELF file %s...' % elf_file)
    e = esptool.ELFFile(elf_file)

    text_section = e.get_section('.text')
    try:
        data_section = e.get_section('.data')
    except ValueError:
        data_section = None
    stub = {
         'text': text_section.data,
         'text_start': text_section.addr,
         'entry': e.entrypoint,
        }
    if data_section is not None:
        stub['data'] = data_section.data
        stub['data_start'] = data_section.addr

    # Pad text with NOPs to mod 4.

if self.flags & self.SHF_WRITE:
            str += 'W'
        else:
            str += ' '
        if self.flags & self.SHF_EXECINSTR:
            str += 'X'
        else:
            str += ' '
        if self.flags & self.SHF_ALLOC:
            str += 'A'
        else:
            str += ' '
        return str


class ESPCoreDumpElfFile(esptool.ELFFile):
    """ Wrapper class for core dump ELF file
    """
    # ELF file type
    ET_NONE             = 0x0  # No file type
    ET_REL              = 0x1  # Relocatable file
    ET_EXEC             = 0x2  # Executable file
    ET_DYN              = 0x3  # Shared object file
    ET_CORE             = 0x4  # Core file
    # ELF file version
    EV_NONE             = 0x0
    EV_CURRENT          = 0x1
    # ELF file machine type
    EM_NONE             = 0x0
    EM_XTENSA           = 0x5E
    # section types
    SEC_TYPE_PROGBITS   = 0x01

f.seek(section_header_offs)
        section_header = f.read()
        LEN_SEC_HEADER = 0x28
        if len(section_header) == 0:
            raise ESPCoreDumpError("No section header found at offset %04x in ELF file." % section_header_offs)
        if len(section_header) % LEN_SEC_HEADER != 0:
            logging.warning('Unexpected ELF section header length %04x is not mod-%02x' % (len(section_header),LEN_SEC_HEADER))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,flags,lma,sec_offs,size = struct.unpack_from("

f.seek(section_header_offs)
        len_bytes = section_header_count * self.LEN_SEC_HEADER
        section_header = f.read(len_bytes)
        if len(section_header) == 0:
            raise FatalError("No section header found at offset %04x in ELF file." % section_header_offs)
        if len(section_header) != (len_bytes):
            raise FatalError("Only read 0x%x bytes from section header (expected 0x%x.) Truncated ELF file?" % (len(section_header), len_bytes))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), self.LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,_flags,lma,sec_offs,size = struct.unpack_from("

f.seek(section_header_offs)
        len_bytes = section_header_count * self.LEN_SEC_HEADER
        section_header = f.read(len_bytes)
        if len(section_header) == 0:
            raise FatalError("No section header found at offset %04x in ELF file." % section_header_offs)
        if len(section_header) != (len_bytes):
            raise FatalError("Only read 0x%x bytes from section header (expected 0x%x.) Truncated ELF file?" % (len(section_header), len_bytes))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), self.LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,_flags,lma,sec_offs,size = struct.unpack_from("

logging.warning('Unexpected ELF section header length %04x is not mod-%02x' % (len(section_header),LEN_SEC_HEADER))

        # walk through the section header and extract all sections
        section_header_offsets = range(0, len(section_header), LEN_SEC_HEADER)

        def read_section_header(offs):
            name_offs,sec_type,flags,lma,sec_offs,size = struct.unpack_from("

if self.flags & self.SHF_WRITE:
            str += 'W'
        else:
            str += ' '
        if self.flags & self.SHF_EXECINSTR:
            str += 'X'
        else:
            str += ' '
        if self.flags & self.SHF_ALLOC:
            str += 'A'
        else:
            str += ' '
        return str


class ESPCoreDumpElfFile(esptool.ELFFile):
    """ Wrapper class for core dump ELF file
    """
    # extra regs IDs used in EXTRA_INFO note
    REG_EXCCAUSE_IDX    = 0
    REG_EXCVADDR_IDX    = 1
    REG_EPS2_IDX        = 2
    REG_EPS3_IDX        = 3
    REG_EPS4_IDX        = 4
    REG_EPS5_IDX        = 5
    REG_EPS6_IDX        = 6
    REG_EPS7_IDX        = 7
    REG_EPC1_IDX        = 8
    REG_EPC2_IDX        = 9
    REG_EPC3_IDX        = 10
    REG_EPC4_IDX        = 11
    REG_EPC5_IDX        = 12