/
IntelHexFormat.py
executable file
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/
IntelHexFormat.py
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#
# Josh Lifton and Michael Broxton
# MIT Media Lab
# Copyright (c) 2002-2004. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
import string
import binascii
class IntelHexFile:
"""
A class for representing Intel hex files.
For example,
IntelHexFormat.IntelHexFile('MyHexFile.hex').toByteString()
returns an ordered string of bytes that could then be sent
over a serial port to a microcontroller for storage in
flash memory.
On the other hand,
IntelHexFormat.IntelHexFile('MyHexFile.hex').toHexString()
returns a string of hexadecimal numbers more suitable for
being read by people.
"""
dataRecordString = '00'
eofRecordString = '01'
extendedSegmentRecordString = '02'
extendedLinearRecordString = '04'
def __init__(self, fileName):
self.numberOfBytes = 0
self.fileName = fileName
file = open(self.fileName,'r')
self.records = []
line=file.readline()
while line:
self.records.append(IntelHexFileRecord(line))
if self.records[-1].startAddress + self.records[-1].recordLength > self.numberOfBytes:
self.numberOfBytes = self.records[-1].startAddress + self.records[-1].recordLength
line=file.readline()
# Meme - testing
self.numberOfBytes = 32768
file.close()
def toHexArray(self, size=None, startAddress=0):
"This method returns an array of hex strings as they would appear in memory."
if size is None:
size = self.numberOfBytes
hexArray = ['ff']*self.numberOfBytes
if size>0:
for record in self.records:
if record.recordType == self.dataRecordString:
for i in range(record.recordLength):
hexArray[record.startAddress + i] = record.dataBytes[2*i:2*i+2]
else:
print ' Warning: size is zero or negative.'
return hexArray[startAddress:startAddress+size]
def toHexString(self, size=None, startAddress=0):
"This method returns a single hex string as they would appear in memory."
if size is None:
size = self.numberOfBytes
hexArray = self.toHexArray(size, startAddress)
hexString = ''
for hexByte in hexArray:
hexString = hexString + hexByte
return hexString
def toByteString(self, size=None, startAddress=0):
"This method returns a single string of bytes as they would appear in memory."
if size is None:
size = self.numberOfBytes
hexString = self.toHexString(size, startAddress)
return binascii.a2b_hex(hexString)
class IntelHexFileRecord:
"A class for representing a single record (line) in an Intel hex file."
def __init__(self, line):
if line[0] == ':':
self.recordLength = int(line[1:3],16)
self.startAddress = int(line[3:7],16)
self.recordType = line[7:9]
self.dataBytes = line[9:9+2*self.recordLength]
self.checksum = int(line[9+2*self.recordLength:2+9+2*self.recordLength],16)
else:
print ' ERROR. The following record is malformed:'
print line