Source code for dfvfs.analyzer.qcow_analyzer_helper

"""The QCOW format analyzer helper implementation."""

from dfvfs.analyzer import analyzer
from dfvfs.analyzer import analyzer_helper
from dfvfs.analyzer import specification
from dfvfs.lib import definitions




class QCOWAnalyzerHelper(analyzer_helper.AnalyzerHelper):
    """QCOW analyzer helper."""

    FORMAT_CATEGORIES = frozenset([definitions.FORMAT_CATEGORY_STORAGE_MEDIA_IMAGE])

    TYPE_INDICATOR = definitions.TYPE_INDICATOR_QCOW



    def GetFormatSpecification(self):
        """Retrieves the format specification.

        Returns:
          FormatSpecification: format specification or None if the format cannot
              be defined by a specification object.
        """
        format_specification = specification.FormatSpecification(self.type_indicator)

        # QCOW version 1 signature and version.
        format_specification.AddNewSignature(b"QFI\xfb\x00\x00\x00\x01", offset=0)

        # QCOW version 2 signature and version.
        format_specification.AddNewSignature(b"QFI\xfb\x00\x00\x00\x02", offset=0)

        # QCOW version 3 signature and version.
        format_specification.AddNewSignature(b"QFI\xfb\x00\x00\x00\x03", offset=0)

        return format_specification




analyzer.Analyzer.RegisterHelper(QCOWAnalyzerHelper())