def patch_field(self, field, dest, names):
byte_size = math.floor(field.size / 8)
# Only patch fields with a 2- or 4 times multiple of 8
# Greater sizes are taken care of differently
if byte_size != 2 and byte_size != 4:
dest.fields.append(field)
return
# A field name is four letters in size, try all combinations except 0
subfields = []
for i in range(1, 4):
# Try to create all sub-fields without name collisions
for j in range(0, byte_size):
# Create new name by changing character at i to j
curr_name = field.name[:i] + str(j) + field.name[i + 1:]
# Collision, stop the loop
if len(list(filter(lambda x: x == curr_name, names))) != 0:
subfields = []
break
# Create subfield
subfield = Field(field.offset + j, -1, [])
subfield.name = curr_name
subfield.size = 8
subfield.former_name = field.name
# Append subfield
names.append(subfield.name)
subfields.append(subfield)
# Process was successful, no further trials required
if len(subfields) == byte_size:
break
# Not successful, even after all four tries, exit the program
if len(subfields) != byte_size:
print(
f'Could not create subfields for field {field.name} without name-collisions!'
)
sys.exit()
dest.fields = dest.fields + subfields
return
