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# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2018 Google, Inc
# Written by Simon Glass <[email protected]>
#
import struct
import zlib
from binman.etype.blob import Entry_blob
from dtoc import fdt_util
from u_boot_pylib import tools
class Entry_u_boot_env(Entry_blob):
"""An entry which contains a U-Boot environment
Properties / Entry arguments:
- filename: File containing the environment text, with each line in the
form var=value
"""
def __init__(self, section, etype, node):
super().__init__(section, etype, node)
def ReadNode(self):
super().ReadNode()
if self.size is None:
self.Raise("'u-boot-env' entry must have a size property")
self.fill_value = fdt_util.GetByte(self._node, 'fill-byte', 0)
def ReadBlobContents(self):
indata = tools.read_file(self._pathname)
data = b''
for line in indata.splitlines():
data += line + b'\0'
data += b'\0';
pad = self.size - len(data) - 5
if pad < 0:
self.Raise("'u-boot-env' entry too small to hold data (need %#x more bytes)" % -pad)
data += tools.get_bytes(self.fill_value, pad)
crc = zlib.crc32(data)
buf = struct.pack('<I', crc) + b'\x01' + data
self.SetContents(buf)
return True
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