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104
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1 import os
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2
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3 class HexFileException(Exception):
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4 pass
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5
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6 def parseHexLine(line):
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7 """ Parses a hexfile line into three parts """
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8 line = line[1:] # Remove ':'
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9 nums = bytes.fromhex(line)
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10 bytecount = nums[0]
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11 if len(nums) != bytecount + 5:
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12 raise HexFileException('byte count field incorrect')
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13 crc = sum(nums)
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14 if (crc & 0xFF) != 0:
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15 raise HexFileException('crc incorrect')
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16 address = nums[1] * 256 + nums[2]
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17 typ = nums[3]
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18 data = nums[4:-1]
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19 return (address, typ, data)
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20
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21 class HexFile:
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22 """ Represents an intel hexfile """
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23 def __init__(self, filename=None):
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24 self.regions = []
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25 self.startAddress = 0
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26 self.filename = None
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27 if filename:
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28 self.load(filename)
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29
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30 def load(self, filename):
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31 with open(filename, 'r') as f:
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32 endOfFile = False
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33 offset = 0
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34 startAddress = 0
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35 curAddress = 0
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36 curData = bytearray()
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37 for line in f:
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38 line = line.strip() # Strip spaces and newlines
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39 if not line: continue # Skip empty lines
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40 if line[0] != ':': continue # Skip lines that do not start with a ':'
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41 if endOfFile: raise HexFileException('hexfile line after end of file record')
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42 address, typ, data = parseHexLine(line)
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43 if typ == 0x0: # Data record
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44 address += offset # Fix address with offset
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45 # Append data
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46 if address == curAddress:
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47 curData += data
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48 curAddress += len(data)
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49 else:
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50 if curData:
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51 self.regions.append(HexFileRegion(startAddress, bytes(curData)))
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52 startAddress = address
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53 curAddress = address + len(data)
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54 curData = bytearray(data)
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55 elif typ == 0x4: # Extended linear address record
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56 offset = ((data[0] << 8) + data[1]) << 16
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57 elif typ == 0x1: # End of file record
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58 if len(data) != 0:
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59 raise HexFileException('end of file record must contain no data')
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60 endOfFile = True
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61 elif typ == 0x5: # Start address record (where IP goes after loading)
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62 self.startAddress = (data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]
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63 else:
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64 raise HexFileException('record type {0} not implemented'.format(typ))
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65 print(hex(address), typ, data)
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66 # After all lines:
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67 if curData:
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68 self.regions.append(HexFileRegion(startAddress, bytes(curData)))
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69 # Store the filename:
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70 self.filename = filename
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71 def __repr__(self):
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72 i = []
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73 i.append(super().__repr__())
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74 i.append('Start address {0}'.format(hex(self.startAddress)))
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75 i.append('Filename: {0}'.format(self.filename))
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76 for r in self.regions:
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77 i.append(str(r))
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78 return os.linesep.join(i)
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79 def save(self, filename):
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80 with open(filename, 'w') as f:
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81 for line in f:
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82 pass
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83
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84 class HexFileRegion:
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85 def __init__(self, address, data = bytes()):
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86 self.address = address
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87 self.data = data
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88 def __repr__(self):
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89 return 'Region at 0x{0:X} of {1} bytes'.format(self.address, len(self.data))
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90
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91 if __name__ == '__main__':
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92 h = HexFile()
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93 print(h)
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94 """ Test hexfile implementation with some hexfile """
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95 h1 = HexFile('audio.hex')
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96 print(h1)
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97
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