import io

from .matcher import SignatureMatcher, Match

class ELF(SignatureMatcher):
    def __init__(self, file):
        self.name = "ELF"
        self.signature = b'\x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00'
        super().__init__(file)

    def is_valid(self):
        for match in self.search():
            # walk back for the firmware section header
            start = match
            self.matches += [Match(start, 0)]

        return len(self.matches) != 0