""" This class generate EAN bar code, it required PIL (python imaging library) installed. If the code has not checksum (12 digits), it added automatically. Create bar code sample : from EANBarCode import EanBarCode bar = EanBarCode() bar.getImage("9782212110708",50,"gif") """ # courbB08.pil PIL Font file uuencoded courB08_pil ="""eJztl91rFkcUxp+Zt7vGFYzVtiJKICgYlLRWkaBBVGgDraFGCH5gsQp+QMBqabAVRYJYAlakCkoh CpYgxaLkIu1NvLBeSAStglpqL6xQAsVe2AuL5u2buH3mzGaYPf9AKWTl8d3nl7MzZ2bnazvea9+9 7+PurFWut5e0Zu+s7VybYfKavP7LK3X/5TlM4Q3/OWbyf1ARD/6mgb2SjwtPhbpnq0iKZ6ahrmCj wqbxdgamRnHOA69jimN5zvIS8cDcUEeVdYzRAw1FHcJYXgPvG4s6Jlgj7xeEequS3wLeNvGvnrEO tq+Jt82szT+b86+WHlgS2jHGuHF6YHnog1zaupxqCcy3t4X3rVG9iXhgjW+bsFQ80BaxRDywTrF1 VId6toPaqOI2UlsV20ptV2w7tUuxXVSXYl3UvoIZ9kFFPPBJ6D/HLD3QXbwjyDjI6YHPiz5FXiN7 SQ8cDu/N9/1h3veEOP/Oe6gvQnmuvYYe+NL3qYyNVDxw2seF8XKa+jrKJREPnFdx56l+xfqpS4pd ogZUeQPU91FcKh64GveBeOCaKu8adUM9e4O6reJuU/cUu0c9VM8+pB6r/B5TI+rZEerPUpyhB/6K 5lsqHniuyntO1VR5Nb5CU86FHqZOsTqqXrF66o2ojlQ8zDwVN4+aX86FHqYpXg9YLeevWRzPc7LF ZG+V1wN6mKXxvMzH6GFaJua5zGNLD7MqmtNcc+hh1oT1oCb5cf6aNj92mbPMGXqY9jCPasLaqQ1h jMv8pYfZpOI2UR9GcYl4mB1RnMtvB9me8N583B5qb3mNoIf5NGJc1+hhPvPrrjybioc5op49Qh0L dfj8jlHHQ3s9O059Fc3zRDzMmVKcpYfpU+3oI/umxJyH+TYqLxUPc0X13xVqMMovFQ8zpPIbon6M WCoeZljVMUz9VIqz9DAP1Dt6QP0a9gpZ7+lhHhXjysreaOhhfiv1vaGH+T2Mv5rbU+hh/uAaOnlN Xv+Hy4/7mtv3OW5hnpTODIYe5mm0xqbiYf4OcbLv08NU1ZyuuqKLOEvm6sjhJkd8TjRustgkrO3u vFGjh60r1uyiPHrY6eH84tb7l/SwM8vrAT3snHgNY9wcsoby+Y8edn5UxxTxsIuitrlcFpG9GcVx /6CHXRrKk72MHrYl3stYB/ceu7I4X02wlWSrCmaF1ehhV7NrovWKHrattI4betj20Fc8r7E87kf2 g+gcy32BHnZDfKZmHPco2xnl4vqlk2yz6r/N1EfRPpiKh90d7VGpeNi9inGPst2lNdbSwx4McS8k 7iDVE/Ytz3qoXsV6qZOKnaTOBDYqjPuRPRfOkz7uHNUf4uQMQg/7XekMYulhB6JnE/GwP0T1JuJh ryrGM6G9HuWSiIcdDnPmhTs70sPeCuPes1vUXcXuUvcDGxV2n/olOisn4mEfhfOVby/3KDsSlZeI h32iGOe0faoY57R9ptgzajTKJREPOx7aJnOfHhUbxov0Mz0qU8v50aMyo/wu6VGZrdhsqqH8fnll HEEz4zj6DNMxK+4X+gyv8cszyoU+4zfmjNAO9zuXrNGXF1gj2ULFFpI1K9ZMtiww//22jGwFXg39 535XkK0O+cl5gz7Du6iP5wd9hvfDs9LP9BnWR/U6tp6sU7FOsi1RLo5tIdsWled+t5HtVO3YSdal WBfZftW2/WQHVH4HyA6F9+GfPUR2VOV3lKxXsV6yE4qdIDul2Cmys6ptZ8n6Qi7+m7OP7ELoU/8t dIHsoo8L+V0ku6xyvkw2qNgg2VBgvg+GyK6XyrP0GW5ydE3EuXd5k+xOeOdVibtD9jNm/Qv15O4i""" # courbB08.pbm font file uuencoded courB08_pbm ="""eJxNkntM01cUx8+P2/1apUAZEpECq4KRjKhF0E55FYEp4yG6mglz2Q8Q1BhERhhls/zKI+CID4wb IAPKpk4GAzqZPKKMX2GIUwGJG+ImtKwKjIzXcGuBtncV0Hn+uLnn5Nzv55xv7mdRkbusVjquBACr 0N3B+wCQi/m+ijAf4LGl/wgAiwkNDpRIyyABSjGkBQ/fa3c1bfLs4U8ulDcYUs/502rTpIlO9pyc Kp/Buql6f3rmZ1NqvpO2SZXf0duY3j0563zjoZpW8AvHRmVeZ/Co36mFR8bERzlsxOMJ+oJshsS5 7rlfzFzmnZFEFnIEZjTGizgLsLzjl4QtrNprBRu10e+u9GgePHjG63bPDw/H87uix0Vtsvkqg9qO lUimPLiOM4z69YfqIu5Pa2Sr/io6n9Xmf9e+57W1Iapo4lLQBdLSWc/z3KOSlgznDXTW/Flh21kX IeUIX8FZVL9dwP4NBH5jglYxkBNFmWgMcfsAxM/9gEL5TTwYpnfElR8qQ+WiCgeTHOAfb2bW/cQC /FozFOOQzAebtjRvQLI7HBtXvaZe25a3Q/1vZpPa+kd1XXKuflr5Cm48YUsUcjMXjsm/sf+22s6z QAbGZ8mEXMzSE4y9AHhRpltwB1N9ynz5H2MOi0MEi4E5O1ov9ogrFU5cMWAcdgQb3xHFtFK+0pkh VnYWxltx92j69p6jJ9OnHr+Cq5x5X6Mz70JcX2tEG5LIShM4EHIGoLIRsHzcvEuGwMYA4DZPn7gP MA1QIgltnt82cTu7j5n76mmz3TU5Bh3PFRTHku52aBgaTnJD7m1c0a3hNjbWWjBtMsP/OFac/LYA NAAWepdYodB58NBFIuOjNSQ4cgXplqP2RyOe8fd999T8weqBRwLwNFdQobHgA1/YTV8PH+TwV59v Bo7Y1J4rmHFv3T9e8rmmXdGSuPpSbBnhYJ7V8ICz6AfGcdTpRkpCUU8WcOT8wb+dSHIb6QZapx0M Y2DO4i7jYV2AUNkkErpQFHVYmFRmYD7OJhDyQSiow4IkrS3TbpQqFA9slE4jnj6peXMTC+N8buJ2 0Uv5eOothuGIiluyCDtff3miBzJHjncOIC3bPT8FLabRPd0TCWy346Mmn9Rz23WyNMJcsnqhQani 3CMFOZuYU7c20zTNVqNbGPNxALWnybeLEcTvXWpc10leI5ae/CI9qBqI686cnO6P6F33e2vAp0nz 9+hnbNeueh/261UJK5aVeSf73ZSXA7dOBXvkXODEb9hVww4KtPNAbPvaZbi0q9kICCl+CiBJSzLv a8TlntYlC4UHvCRTlaXOy13VAbN0eae2v3hNesWXLsWPkjfOPq7e6zd1fOfc1TckDaylrvleinnT 8Ui87ScLMVhhEx7SUJ8U2zKrRR2Z1dEqZlkr7kDTuhFjpkvse9ZXN0R9H+DlYA4TXVm6/kXDQMyT eGnJFXlLlSgva5iLUEcbiyDzNqf4Wr9kKYVUIcY40DrnsW4E4zW9QxnHVYx+bo64mIskDWjZgCrq eVQFrS7Sh/uFLftIidKWbgj6Oq652d4c3v88Dw2JDK7bSWX/ByuaLZI=""" 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)) 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""" import Image, ImageFont, ImageDraw from string import lower, upper # Create a missing font file decodeFontFile(courB08_pil ,"courB08.pil") decodeFontFile(courB08_pbm ,"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("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(code+"."+lower(extension), upper(extension)) 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 test(): """ Execute all tests """ testWithChecksum() testWithoutChecksum() testImage() if __name__ == "__main__": test()