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Editing: notes.py

#-------------------------------------------------------------------------------
# elftools: elf/notes.py
#
# ELF notes
#
# Eli Bendersky (eliben@gmail.com)
# This code is in the public domain
#-------------------------------------------------------------------------------
from ..common.py3compat import bytes2str
from ..common.utils import struct_parse, roundup
from ..construct import CString

def iter_notes(elffile, offset, size):
    """ Yield all the notes in a section or segment.
    """
    end = offset + size
    while offset < end:
        note = struct_parse(
            elffile.structs.Elf_Nhdr,
            elffile.stream,
            stream_pos=offset)
        note['n_offset'] = offset
        offset += elffile.structs.Elf_Nhdr.sizeof()
        elffile.stream.seek(offset)
        # n_namesz is 4-byte aligned.
        disk_namesz = roundup(note['n_namesz'], 2)
        note['n_name'] = bytes2str(
            CString('').parse(elffile.stream.read(disk_namesz)))
        offset += disk_namesz

desc_data = bytes2str(elffile.stream.read(note['n_descsz']))
        note['n_descdata'] = desc_data
        if note['n_type'] == 'NT_GNU_ABI_TAG':
            note['n_desc'] = struct_parse(elffile.structs.Elf_abi,
                                          elffile.stream,
                                          offset)
        elif note['n_type'] == 'NT_GNU_BUILD_ID':
            note['n_desc'] = ''.join('%.2x' % ord(b) for b in desc_data)
        elif note['n_type'] == 'NT_PRPSINFO':
            note['n_desc'] = struct_parse(elffile.structs.Elf_Prpsinfo,
                                          elffile.stream,
                                          offset)
        elif note['n_type'] == 'NT_FILE':
            note['n_desc'] = struct_parse(elffile.structs.Elf_Nt_File,
                                          elffile.stream,
                                          offset)
        else:
            note['n_desc'] = desc_data
        offset += roundup(note['n_descsz'], 2)
        note['n_size'] = offset - note['n_offset']
        yield note

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