tools/binman/image.py

# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# Class for an image, the output of binman
#

from __future__ import print_function

from collections import OrderedDict
from operator import attrgetter
import re
import sys

import fdt_util
import bsection
import tools

class Image:
    """A Image, representing an output from binman

    An image is comprised of a collection of entries each containing binary
    data. The image size must be large enough to hold all of this data.

    This class implements the various operations needed for images.

    Atrtributes:
        _node: Node object that contains the image definition in device tree
        _name: Image name
        _size: Image size in bytes, or None if not known yet
        _filename: Output filename for image
        _sections: Sections present in this image (may be one or more)

    Args:
        test: True if this is being called from a test of Images. This this case
            there is no device tree defining the structure of the section, so
            we create a section manually.
    """
    def __init__(self, name, node, test=False):
        self._node = node
        self._name = name
        self._size = None
        self._filename = '%s.bin' % self._name
        if test:
            self._section = bsection.Section('main-section', self._node, True)
        else:
            self._ReadNode()

    def _ReadNode(self):
        """Read properties from the image node"""
        self._size = fdt_util.GetInt(self._node, 'size')
        filename = fdt_util.GetString(self._node, 'filename')
        if filename:
            self._filename = filename
        self._section = bsection.Section('main-section', self._node)

    def GetEntryContents(self):
        """Call ObtainContents() for the section
        """
        self._section.GetEntryContents()

    def GetEntryPositions(self):
        """Handle entries that want to set the position/size of other entries

        This calls each entry's GetPositions() method. If it returns a list
        of entries to update, it updates them.
        """
        self._section.GetEntryPositions()

    def PackEntries(self):
        """Pack all entries into the image"""
        self._section.PackEntries()

    def CheckSize(self):
        """Check that the image contents does not exceed its size, etc."""
        self._size = self._section.CheckSize()

    def CheckEntries(self):
        """Check that entries do not overlap or extend outside the image"""
        self._section.CheckEntries()

    def ProcessEntryContents(self):
        """Call the ProcessContents() method for each entry

        This is intended to adjust the contents as needed by the entry type.
        """
        self._section.ProcessEntryContents()

    def WriteSymbols(self):
        """Write symbol values into binary files for access at run time"""
        self._section.WriteSymbols()

    def BuildImage(self):
        """Write the image to a file"""
        fname = tools.GetOutputFilename(self._filename)
        with open(fname, 'wb') as fd:
            self._section.BuildSection(fd, 0)

    def GetEntries(self):
        return self._section.GetEntries()