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"""
Module to read intel hex files into binary data blobs.
IntelHex files are commonly used to distribute firmware
See: http://en.wikipedia.org/wiki/Intel_HEX
This is a python 3 conversion of the code created by David Braam for the Cura project.
"""
import io
from UM.Logger import Logger
def readHex(filename):
"""
Read an verify an intel hex file. Return the data as an list of bytes.
"""
data = []
extra_addr = 0
f = io.open(filename, "r", encoding = "utf-8")
for line in f:
line = line.strip()
if len(line) < 1:
continue
if line[0] != ":":
raise Exception("Hex file has a line not starting with ':'")
rec_len = int(line[1:3], 16)
addr = int(line[3:7], 16) + extra_addr
rec_type = int(line[7:9], 16)
if len(line) != rec_len * 2 + 11:
raise Exception("Error in hex file: " + line)
check_sum = 0
for i in range(0, rec_len + 5):
check_sum += int(line[i*2+1:i*2+3], 16)
check_sum &= 0xFF
if check_sum != 0:
raise Exception("Checksum error in hex file: " + line)
if rec_type == 0:#Data record
while len(data) < addr + rec_len:
data.append(0)
for i in range(0, rec_len):
data[addr + i] = int(line[i*2+9:i*2+11], 16)
elif rec_type == 1: #End Of File record
pass
elif rec_type == 2: #Extended Segment Address Record
extra_addr = int(line[9:13], 16) * 16
else:
Logger.log("d", "%s, %s, %s, %s, %s", rec_type, rec_len, addr, check_sum, line)
f.close()
return data
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