/
EANBarCode.py
293 lines (235 loc) · 14.5 KB
/
EANBarCode.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
# courbB08.pil PIL Font file uuencoded
courB08_pil ="""eJztl91rFkcUxp+Zt7vGFYzVtiJKICgYlLRWkaBBVGgDraFGCH5gsQp+QMBqabAVRYJYAlakCkoh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"""
# courbB08.pbm font file uuencoded
courB08_pbm ="""eJxNkntM01cUx8+P2/1apUAZEpECq4KRjKhF0E55FYEp4yG6mglz2Q8Q1BhERhhls/zKI+CID4wb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"""
class EanBarCode:
""" Compute the EAN bar code """
def __init__(self):
A = {0 : "0001101", 1 : "0011001", 2 : "0010011", 3 : "0111101", 4 : "0100011",
5 : "0110001", 6 : "0101111", 7 : "0111011", 8 : "0110111", 9 : "0001011"}
B = {0 : "0100111", 1 : "0110011", 2 : "0011011", 3 : "0100001", 4 : "0011101",
5 : "0111001", 6 : "0000101", 7 : "0010001", 8 : "0001001", 9 : "0010111"}
C = {0 : "1110010", 1 : "1100110", 2 : "1101100", 3 : "1000010", 4 : "1011100",
5 : "1001110", 6 : "1010000", 7 : "1000100", 8 : "1001000", 9 : "1110100"}
self.groupC = C
self.family = {0 : (A,A,A,A,A,A), 1 : (A,A,B,A,B,B), 2 : (A,A,B,B,A,B), 3 : (A,A,B,B,B,A), 4 : (A,B,A,A,B,B),
5 : (A,B,B,A,A,B), 6 : (A,B,B,B,A,A), 7 : (A,B,A,B,A,B), 8 : (A,B,A,B,B,A), 9 : (A,B,B,A,B,A)}
def makeCode(self, code):
""" Create the binary code
return a string which contains "0" for white bar, "1" for black bar, "L" for long bar """
# Convert code string in integer list
self.EAN13 = []
for digit in code:
self.EAN13.append(int(digit))
# If the code has already a checksum
if len(self.EAN13) == 13:
# Verify checksum
self.verifyChecksum(self.EAN13)
# If the code has not yet checksum
elif len(self.EAN13) == 12:
# Add checksum value
self.EAN13.append(self.computeChecksum(self.EAN13))
# Get the left codage class
left = self.family[self.EAN13[0]]
# Add start separator
strCode = 'L0L'
# Compute the left part of bar code
for i in range(0,6):
strCode += left[i][self.EAN13[i+1]]
# Add middle separator
strCode += '0L0L0'
# Compute the right codage class
for i in range (7,13):
strCode += self.groupC[self.EAN13[i]]
# Add stop separator
strCode += 'L0L'
return strCode
def computeChecksum(self, arg):
""" Compute the checksum of bar code """
# UPCA/EAN13
weight=[1,3]*6
magic=10
sum = 0
for i in range(12): # checksum based on first 12 digits.
sum = sum + int(arg[i]) * weight[i]
z = ( magic - (sum % magic) ) % magic
if z < 0 or z >= magic:
return None
return z
def verifyChecksum(self, bits):
""" Verify the checksum """
computedChecksum = self.computeChecksum(bits[:12])
codeBarChecksum = bits[12]
if codeBarChecksum != computedChecksum:
#raise Exception ("Bad checksum is %s and should be %s"%(codeBarChecksum, computedChecksum))
return False
return True
def getImage(self, value, height = 50, extension = "PNG"):
""" Get an image with PIL library
value code barre value
height height in pixel of the bar code
extension image file extension"""
from PIL import Image, ImageFont, ImageDraw
# Create a missing font file
decodeFontFile(courB08_pil ,"Dados/courB08.pil")
decodeFontFile(courB08_pbm ,"Dados/courB08.pbm")
# Get the bar code list
bits = self.makeCode(value)
# Get thee bar code with the checksum added
code = ""
for digit in self.EAN13:
code += "%d"%digit
# Create a new image
position = 8
im = Image.new("1",(len(bits)+position,height))
# Load font
font = ImageFont.load("Dados/courB08.pil")
# Create drawer
draw = ImageDraw.Draw(im)
# Erase image
draw.rectangle(((0,0),(im.size[0],im.size[1])),fill=256)
# Draw first part of number
draw.text((0, height-9), code[0], font=font, fill=0)
# Draw first part of number
draw.text((position+7, height-9), code[1:7], font=font, fill=0)
# Draw second part of number
draw.text((len(bits)/2+6+position, height-9), code[7:], font=font, fill=0)
# Draw the bar codes
for bit in range(len(bits)):
# Draw normal bar
if bits[bit] == '1':
draw.rectangle(((bit+position,0),(bit+position,height-10)),fill=0)
# Draw long bar
elif bits[bit] == 'L':
draw.rectangle(((bit+position,0),(bit+position,height-3)),fill=0)
# Save the result image
im.save("Dados/"+code+"."+extension.lower(), extension.upper())
def getHtml(self, value, height = 50):
""" Build an HTML bar code """
result = ""
# Get the bar code list
bits = self.makeCode(value)
# Get thee bar code with the checksum added
code = ""
for digit in self.EAN13:
code += "%d"%digit
result += '<table><tr><td><center><table cellspacing="0" cellpadding="0" border="0" bgcolor="white"><tr height=%d >'%height
bitsList = []
previousBit = ""
for bit in bits:
if bit == previousBit:
if bit == "0":
bitsList[-1] -= 1
else:
bitsList[-1] += 1
else:
if bit == "0":
bitsList.append(-1)
else:
bitsList.append(1)
previousBit = bit
result += '<td width=10></td>'
for bit in bitsList:
if bit < 0:
result += '<td width=%d></td>'%(-bit)
else:
result += '<td bgcolor="black" width=%d></td>'%(+bit)
result += '<td width=10></td>'
result += "</tr></table></center></td></tr><tr><td><center>%s</center></td></tr></table>"%(code)
return result
def decodeFontFile(data, file):
""" Decode font file embedded in this script and create file """
from zlib import decompress
from base64 import decodestring
from os.path import exists
# If the font file is missing
if not exists(file):
# Write font file
open (file, "wb").write(decompress(decodestring(data)))
def testWithChecksum():
""" Test bar code with checksum """
bar = EanBarCode()
assert(bar.makeCode('0000000000000')== 'L0L0001101000110100011010001101000110100011010L0L0111001011100101110010111001011100101110010L0L' )
assert(bar.makeCode('1111111111116')== 'L0L0011001001100101100110011001011001101100110L0L0110011011001101100110110011011001101010000L0L' )
assert(bar.makeCode('2222222222222')== 'L0L0010011001001100110110011011001001100110110L0L0110110011011001101100110110011011001101100L0L' )
assert(bar.makeCode('3333333333338')== 'L0L0111101011110101000010100001010000101111010L0L0100001010000101000010100001010000101001000L0L' )
assert(bar.makeCode('4444444444444')== 'L0L0100011001110101000110100011001110100111010L0L0101110010111001011100101110010111001011100L0L' )
assert(bar.makeCode('5555555555550')== 'L0L0110001011100101110010110001011000101110010L0L0100111010011101001110100111010011101110010L0L' )
assert(bar.makeCode('6666666666666')== 'L0L0101111000010100001010000101010111101011110L0L0101000010100001010000101000010100001010000L0L' )
assert(bar.makeCode('7777777777772')== 'L0L0111011001000101110110010001011101100100010L0L0100010010001001000100100010010001001101100L0L' )
assert(bar.makeCode('8888888888888')== 'L0L0110111000100101101110001001000100101101110L0L0100100010010001001000100100010010001001000L0L' )
assert(bar.makeCode('9999999999994')== 'L0L0001011001011100101110001011001011100010110L0L0111010011101001110100111010011101001011100L0L' )
def testWithoutChecksum():
""" Test bar code without checksum """
bar = EanBarCode()
assert(bar.makeCode('000000000000')== 'L0L0001101000110100011010001101000110100011010L0L0111001011100101110010111001011100101110010L0L' )
assert(bar.makeCode('111111111111')== 'L0L0011001001100101100110011001011001101100110L0L0110011011001101100110110011011001101010000L0L' )
assert(bar.makeCode('222222222222')== 'L0L0010011001001100110110011011001001100110110L0L0110110011011001101100110110011011001101100L0L' )
assert(bar.makeCode('333333333333')== 'L0L0111101011110101000010100001010000101111010L0L0100001010000101000010100001010000101001000L0L' )
assert(bar.makeCode('444444444444')== 'L0L0100011001110101000110100011001110100111010L0L0101110010111001011100101110010111001011100L0L' )
assert(bar.makeCode('555555555555')== 'L0L0110001011100101110010110001011000101110010L0L0100111010011101001110100111010011101110010L0L' )
assert(bar.makeCode('666666666666')== 'L0L0101111000010100001010000101010111101011110L0L0101000010100001010000101000010100001010000L0L' )
assert(bar.makeCode('777777777777')== 'L0L0111011001000101110110010001011101100100010L0L0100010010001001000100100010010001001101100L0L' )
assert(bar.makeCode('888888888888')== 'L0L0110111000100101101110001001000100101101110L0L0100100010010001001000100100010010001001000L0L' )
assert(bar.makeCode('999999999999')== 'L0L0001011001011100101110001011001011100010110L0L0111010011101001110100111010011101001011100L0L' )
def testImage():
""" Test images generation with PIL """
bar = EanBarCode()
bar.getImage("9782212110708",50,"gif")
bar.getImage("978221211070",50,"png")
def testHtml():
""" Test HTML generation """
bar = EanBarCode()
open("9782212110708.html","w").write(bar.getHtml("9782212110708",50))
assert(bar.getHtml("9782212110708",50) == '<table><tr><td><center><table cellspacing="0" cellpadding="0" border="0" bgcolor="white"><tr height=50 ><td width=10></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=3></td><td width=1></td><td bgcolor="black" width=2></td><td width=3></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=2></td><td width=1></td><td bgcolor="black" width=2></td><td width=2></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=2></td><td width=1></td><td bgcolor="black" width=2></td><td width=2></td><td bgcolor="black" width=2></td><td width=2></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=2></td><td width=1></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=2></td><td width=2></td><td bgcolor="black" width=2></td><td width=1></td><td bgcolor="black" width=2></td><td width=2></td><td bgcolor="black" width=2></td><td width=1></td><td bgcolor="black" width=3></td><td width=2></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=1></td><td width=3></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=3></td><td width=2></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=1></td><td width=2></td><td bgcolor="black" width=1></td><td width=3></td><td bgcolor="black" width=1></td><td width=1></td><td bgcolor="black" width=1></td><td width=10></td></tr></table></center></td></tr><tr><td><center>9782212110708</center></td></tr></table>')
def test():
""" Execute all tests """
testWithChecksum()
testWithoutChecksum()
testHtml()
testImage()
if __name__ == "__main__":
test()