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- #!/usr/bin/python2.5
- #
- # Copyright 2009 Olivier Gillet.
- #
- # Author: Olivier Gillet (ol.gillet@gmail.com)
- #
- # This program is free software: you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation, either version 3 of the License, or
- # (at your option) any later version.
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- # You should have received a copy of the GNU General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
- #
- # -----------------------------------------------------------------------------
- #
- # Python module for loading/writing Hex files.
-
- """Intel .hex file loader/writer"""
-
- import logging
- import sys
-
-
- def LoadHexFile(lines):
- """Loads a Hex file."""
-
- data = []
- for line_number, line in enumerate(lines):
- line = line.strip()
- if len(line) < 9:
- logging.info('Line %(line_number)d: line too short' % locals())
- return None
-
- if not all(x in '0123456789abcdefABCDEF' for x in line[1:]):
- logging.info('Line %(line_number)d: unknown character' % locals())
- return None
-
- bytes = [int(line[i:i+2], 16) for i in xrange(1, len(line), 2)]
- if bytes[0] != len(bytes) - 5:
- logging.info('Line %(line_number)d: invalid byte count' % locals())
- return None
-
- if sum(bytes) % 256 != 0:
- logging.info('Line %(line_number)d: corrupted line' % locals())
- return None
-
- if bytes[3] == 1:
- if bytes[0] != 0 or bytes[1] != 0 or bytes[2] != 0:
- logging.info('Line %(line_number)d: invalid end of file' % locals())
- return None
- else:
- break
- elif bytes[3] == 0:
- address = bytes[1] << 8 | bytes[2]
- padding_size = address + bytes[0] - len(data)
- if padding_size > 0:
- data += [0] * padding_size
- data[address:address + bytes[0]] = bytes[4:-1]
- return data
-
-
- def WriteHexFile(data, file_object, chunk_size=32):
- """Writes a Hex file."""
-
- for address in xrange(0, len(data), chunk_size):
- chunk = data[address:address+chunk_size]
- chunk_len = len(chunk)
- address_l = address & 255
- address_h = address >> 8
- file_object.write(':%(chunk_len)02x%(address_h)02x%(address_l)02x00' % vars())
- file_object.write(''.join('%02x' % value for value in chunk))
- checksum = (-(chunk_len + address_l + address_h + sum(chunk))) & 255
- file_object.write('%02x\n' % checksum)
- file_object.write(':00000001FF\n')
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