def __repr__(self):
"""
Build and return a text entity package
:return: str representing entity
"""
# Start with packet, then add length of packet
out = ""
out += int_to_hexstring(self.vertical,
little_endian=True,
number_of_hex_digits=3)
out += int_to_hexstring(self.horizontal,
little_endian=False,
number_of_hex_digits=3)
out += int_to_hexstring(self.draw_style,
little_endian=False,
number_of_hex_digits=2)
out += int_to_hexstring(self.font_style,
little_endian=False,
number_of_hex_digits=2)
out += utf8_to_utf16hexstring(self.text)
length = int_to_hexstring(int(len(out) / 2),
little_endian=False,
number_of_hex_digits=2)
out = length + out
return out
def __str__(self):
"""
Build a human readable packet
:return: str
"""
out = "Entity Text package\n"
out += "Part\t\t\t\t\tLength\tData\n"
length = len(self.__repr__()) - 2
out += "DataLengthSegment\t\t2\t\t%s (%d*2=%d bytes)\n" % (
int_to_hexstring(int(length / 2),
little_endian=False,
number_of_hex_digits=2), int(length / 2), length)
out += "Vertical\t\t\t\t3\t\t%s (%d)\n" % (int_to_hexstring(
self.vertical, little_endian=True,
number_of_hex_digits=3), self.vertical)
out += "Horizontal\t\t\t\t3\t\t%s (%d)\n" % (int_to_hexstring(
self.horizontal, little_endian=False,
number_of_hex_digits=3), self.horizontal)
if self.draw_style in DrawStyles:
out += "DrawStyle\t\t\t\t2\t\t%s (%s)\n" % (int_to_hexstring(
self.draw_style, little_endian=False,
number_of_hex_digits=2), DrawStyles[self.draw_style])
else:
out += "DrawStyle\t\t\t\t2\t\t%s (Unknown)\n" % int_to_hexstring(
self.draw_style, little_endian=False, number_of_hex_digits=2)
if self.font_style in FontStyles:
out += "FontStyle\t\t\t\t2\t\t%s (%s)\n" % (int_to_hexstring(
self.font_style, little_endian=False,
number_of_hex_digits=2), FontStyles[self.font_style])
else:
out += "FontStyle\t\t\t\t2\t\t%s (Unknown)\n" % int_to_hexstring(
self.font_style, little_endian=False, number_of_hex_digits=2)
out += "Text\t\t\t\t\t\t\t%s (%s)" % (utf8_to_utf16hexstring(
self.text), self.text)
return out
def test_utf8_to_utf16hexstring(self):
self.assertEqual("0041", utf8_to_utf16hexstring("A"))
self.assertEqual("00410061", utf8_to_utf16hexstring("Aa"))
self.assertEqual("0059006F0020006D0061006D006D00610021",
utf8_to_utf16hexstring("Yo mamma!"))
self.assertEqual("003100320033003400350036003700380039",
utf8_to_utf16hexstring("123456789"))
self.assertEqual("0041002000E500E400F600200042",
utf8_to_utf16hexstring("A åäö B"))
self.assertEqual("0041002000C500C400D600200042",
utf8_to_utf16hexstring("A ÅÄÖ B"))
self.assertEqual("003D007B007D005B005D00250026",
utf8_to_utf16hexstring("={}[]%&"))
def __init__(self,
raw="",
vertical=0,
horizontal=0,
draw_style=0,
font_style=0,
text=""):
# Barcodes that is supported now, some other check digits etc. might be needed
self.supported_barcodes = [
FontStylesInv['Barcode EAN13'], FontStylesInv['Barcode 128'],
FontStylesInv['Barcode EAN13 Double Size'],
FontStylesInv['Barcode 128 Double Size']
]
if len(raw) > 0:
self._raw = raw
self.length = hexstring_to_int(self._raw[0:2],
little_endian=False) * 2
if len(self._raw) != self.length + 2:
raise Exception(
f'Barcode packet length field does not match up with actual size, this string is {len(self._raw)} Packet: {self._raw}'
)
self.vertical = hexstring_to_int(self._raw[2:5],
little_endian=True)
self.horizontal = hexstring_to_int(self._raw[5:8],
little_endian=False)
self.draw_style = hexstring_to_int(self._raw[8:10],
little_endian=False)
self.font_style = hexstring_to_int(self._raw[10:12],
little_endian=False)
rawtext = self._raw[12:]
if self.font_style in [
FontStylesInv['Barcode 128'],
FontStylesInv['Barcode 128 Double Size']
]:
self.text = rawtext[
4:
-8] # Skip first start code, and last check digit and stop
if self.font_style in [
FontStylesInv['Barcode EAN13'],
FontStylesInv['Barcode EAN13 Double Size']
]:
if len(rawtext) != (1 * 4) + (13 * 4) + (2 * 4):
raise Exception(
"Can't read EAN 13, expected length to be 1 start + 13 digits + 2 stop."
)
self.text = rawtext[
4:
-12] # Skip first start code, and last check digit and stop
self.text = utf16hexstring_to_utf8(self.text)
else:
self.length = 0
self.vertical = vertical
self.horizontal = horizontal
self.draw_style = draw_style
self.font_style = font_style
self.text = text
self.prefix = "0088" # Start Code B 0088(UTF-16 HTS), also used by EAN 13
if self.font_style not in self.supported_barcodes:
raise Exception("Only Barcode 128 and EAN13 is supported.")
# Barcode 128
if self.font_style in [
FontStylesInv['Barcode 128'],
FontStylesInv['Barcode 128 Double Size']
]:
if len(self.text) < 1:
raise Exception("Barcode 128 musbe more than 0 cahracters.")
if not validate_barcode128b_characters(self.text):
raise Exception(
"Only characters belonging to Barcode 128 B is valid.")
self.suffix = utf8_to_utf16hexstring(
calculate_barcode128b_check_digit(self.text))
self.suffix += "008A" # Stop 008A(UTF-16 VTS)
# EAN 13
if self.font_style in [
FontStylesInv['Barcode EAN13'],
FontStylesInv['Barcode EAN13 Double Size']
]:
if len(self.text) != 12:
raise Exception(
"EAN 13 must bra 12 digits, the 13th is check digit and it will be calculated automatically."
)
if not validate_ean13_characters(self.text):
raise Exception("EAN 13 can only contain digits.")
self.suffix = utf8_to_utf16hexstring(
calculate_ean13_check_digit(self.text))
self.suffix += "003D" # Hardcoded for EAN13?
self.suffix += "008A" # Stop 008A(UTF-16 VTS)