446 lines
18 KiB
Python
446 lines
18 KiB
Python
#this code contributed by Kyle Macfarlane see
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#https://bitbucket.org/rptlab/reportlab/issues/69/implementations-of-code-128-auto-and-data
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__all__= ('ECC200datamatrix',)
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FACTORS = {
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5: (228, 48, 15, 111, 62),
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7: (23, 68, 144, 134, 240, 92, 254),
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10: (28, 24, 185, 166, 223, 248, 116, 255, 110, 61),
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11: (175, 138, 205, 12, 194, 168, 39, 245, 60, 97, 120),
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12: (41, 153, 158, 91, 61, 42, 142, 213, 97, 178, 100, 242),
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14: (156, 97, 192, 252, 95, 9, 157, 119, 138, 45, 18, 186, 83, 185),
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18: (83, 195, 100, 39, 188, 75, 66, 61, 241, 213, 109, 129,
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94, 254, 225, 48, 90, 188),
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20: (15, 195, 244, 9, 233, 71, 168, 2, 188, 160, 153, 145,
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253, 79, 108, 82, 27, 174, 186, 172),
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24: (52, 190, 88, 205, 109, 39, 176, 21, 155, 197, 251, 223, 155,
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21, 5, 172, 254, 124, 12, 181, 184, 96, 50, 193),
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28: (211, 231, 43, 97, 71, 96, 103, 174, 37, 151, 170, 53, 75, 34,
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249, 121, 17, 138, 110, 213, 141, 136, 120, 151, 233, 168, 93, 255),
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36: (245, 127, 242, 218, 130, 250, 162, 181, 102, 120, 84, 179, 220, 251,
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80, 182, 229, 18, 2, 4, 68, 33, 101, 137, 95, 119, 115, 44,
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175, 184, 59, 25, 225, 98, 81, 112),
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42: (77, 193, 137, 31, 19, 38, 22, 153, 247, 105, 122, 2, 245, 133,
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242, 8, 175, 95, 100, 9, 167, 105, 214, 111, 57, 121, 21,
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1, 253, 57, 54, 101, 248, 202, 69, 50, 150, 177, 226, 5, 9, 5),
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48: (245, 132, 172, 223, 96, 32, 117, 22, 238, 133, 238, 231, 205, 188,
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237, 87, 191, 106, 16, 147, 118, 23, 37, 90, 170, 205, 131, 88,
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120, 100, 66, 138, 186, 240, 82, 44, 176, 87, 187, 147, 160, 175,
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69, 213, 92, 253, 225, 19),
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56: (175, 9, 223, 238, 12, 17, 220, 208, 100, 29, 175, 170, 230, 192,
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215, 235, 150, 159, 36, 223, 38, 200, 132, 54, 228, 146, 218, 234,
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117, 203, 29, 232, 144, 238, 22, 150, 201, 117, 62, 207, 164, 13,
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137, 245, 127, 67, 247, 28, 155, 43, 203, 107, 233, 53, 143, 46),
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62: (242, 93, 169, 50, 144, 210, 39, 118, 202, 188, 201, 189, 143, 108,
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196, 37, 185, 112, 134, 230, 245, 63, 197, 190, 250, 106, 185, 221,
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175, 64, 114, 71, 161, 44, 147, 6, 27, 218, 51, 63, 87, 10,
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40, 130, 188, 17, 163, 31, 176, 170, 4, 107, 232, 7, 94, 166,
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224, 124, 86, 47, 11, 204),
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68: (220, 228, 173, 89, 251, 149, 159, 56, 89, 33, 147, 244, 154, 36,
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73, 127, 213, 136, 248, 180, 234, 197, 158, 177, 68, 122, 93, 213,
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15, 160, 227, 236, 66, 139, 153, 185, 202, 167, 179, 25, 220, 232,
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96, 210, 231, 136, 223, 239, 181, 241, 59, 52, 172, 25, 49, 232,
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211, 189, 64, 54, 108, 153, 132, 63, 96, 103, 82, 186)
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}
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LOGVAL = (
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-255, 255, 1, 240, 2, 225, 241, 53, 3, 38, 226, 133, 242, 43,
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54, 210, 4, 195, 39, 114, 227, 106, 134, 28, 243, 140, 44, 23,
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55, 118, 211, 234, 5, 219, 196, 96, 40, 222, 115, 103, 228, 78,
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107, 125, 135, 8, 29, 162, 244, 186, 141, 180, 45, 99, 24, 49,
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56, 13, 119, 153, 212, 199, 235, 91, 6, 76, 220, 217, 197, 11,
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97, 184, 41, 36, 223, 253, 116, 138, 104, 193, 229, 86, 79, 171,
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108, 165, 126, 145, 136, 34, 9, 74, 30, 32, 163, 84, 245, 173,
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187, 204, 142, 81, 181, 190, 46, 88, 100, 159, 25, 231, 50, 207,
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57, 147, 14, 67, 120, 128, 154, 248, 213, 167, 200, 63, 236, 110,
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92, 176, 7, 161, 77, 124, 221, 102, 218, 95, 198, 90, 12, 152,
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98, 48, 185, 179, 42, 209, 37, 132, 224, 52, 254, 239, 117, 233,
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139, 22, 105, 27, 194, 113, 230, 206, 87, 158, 80, 189, 172, 203,
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109, 175, 166, 62, 127, 247, 146, 66, 137, 192, 35, 252, 10, 183,
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75, 216, 31, 83, 33, 73, 164, 144, 85, 170, 246, 65, 174, 61,
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188, 202, 205, 157, 143, 169, 82, 72, 182, 215, 191, 251, 47, 178,
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89, 151, 101, 94, 160, 123, 26, 112, 232, 21, 51, 238, 208, 131,
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58, 69, 148, 18, 15, 16, 68, 17, 121, 149, 129, 19, 155, 59,
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249, 70, 214, 250, 168, 71, 201, 156, 64, 60, 237, 130, 111, 20,
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93, 122, 177, 150
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)
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ALOGVAL = (
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1, 2, 4, 8, 16, 32, 64, 128, 45, 90, 180, 69, 138, 57,
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114, 228, 229, 231, 227, 235, 251, 219, 155, 27, 54, 108, 216, 157,
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23, 46, 92, 184, 93, 186, 89, 178, 73, 146, 9, 18, 36, 72,
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144, 13, 26, 52, 104, 208, 141, 55, 110, 220, 149, 7, 14, 28,
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56, 112, 224, 237, 247, 195, 171, 123, 246, 193, 175, 115, 230, 225,
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239, 243, 203, 187, 91, 182, 65, 130, 41, 82, 164, 101, 202, 185,
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95, 190, 81, 162, 105, 210, 137, 63, 126, 252, 213, 135, 35, 70,
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140, 53, 106, 212, 133, 39, 78, 156, 21, 42, 84, 168, 125, 250,
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217, 159, 19, 38, 76, 152, 29, 58, 116, 232, 253, 215, 131, 43,
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86, 172, 117, 234, 249, 223, 147, 11, 22, 44, 88, 176, 77, 154,
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25, 50, 100, 200, 189, 87, 174, 113, 226, 233, 255, 211, 139, 59,
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118, 236, 245, 199, 163, 107, 214, 129, 47, 94, 188, 85, 170, 121,
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242, 201, 191, 83, 166, 97, 194, 169, 127, 254, 209, 143, 51, 102,
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204, 181, 71, 142, 49, 98, 196, 165, 103, 206, 177, 79, 158, 17,
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34, 68, 136, 61, 122, 244, 197, 167, 99, 198, 161, 111, 222, 145,
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15, 30, 60, 120, 240, 205, 183, 67, 134, 33, 66, 132, 37, 74,
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148, 5, 10, 20, 40, 80, 160, 109, 218, 153, 31, 62, 124, 248,
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221, 151, 3, 6, 12, 24, 48, 96, 192, 173, 119, 238, 241, 207,
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179, 75, 150, 1
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)
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from reportlab.graphics.barcode.common import Barcode
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class ECC200DataMatrix(Barcode):
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'''This code only supports a Type 12 (44x44) C40 encoded data matrix.
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This is the size and encoding that Royal Mail wants on all mail from October 1st 2015.
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see https://bitbucket.org/rptlab/reportlab/issues/69/implementations-of-code-128-auto-and-data
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'''
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barWidth = 4
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def __init__(self, *args, **kwargs):
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Barcode.__init__(self,*args, **kwargs)
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# These values below are hardcoded for a Type 12 44x44 data matrix
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self.row_modules = 44
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self.col_modules = 44
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self.row_regions = 2
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self.col_regions = 2
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self.cw_data = 144
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self.cw_ecc = 56
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self.row_usable_modules = self.row_modules - self.row_regions * 2
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self.col_usable_modules = self.col_modules - self.col_regions * 2
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def validate(self):
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self.valid = 1
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for c in self.value:
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if ord(c) > 255:
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self.valid = 0
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break
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else:
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self.validated = self.value
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def _encode_c40_char(self, char):
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o = ord(char)
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encoded = []
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if o == 32 or (o >= 48 and o <= 57) or (o >= 65 and o <= 90):
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# Stay in set 0
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if o == 32:
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encoded.append(o - 29)
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elif o >= 48 and o <= 57:
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encoded.append(o - 44)
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else:
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encoded.append(o - 51)
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elif o >= 0 and o <= 31:
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encoded.append(0) # Shift to set 1
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encoded.append(o)
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elif (o >= 33 and o <= 64) or (o >= 91 and o <= 95):
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encoded.append(1) # Shift to set 2
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if o >= 33 and o <= 64:
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encoded.append(o - 33)
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else:
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encoded.append(o - 69)
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elif o >= 96 and o <= 127:
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encoded.append(2) # Shift to set 3
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encoded.append(o - 96)
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elif o >= 128 and o <= 255:
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# Extended ASCII
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encoded.append(1) # Shift to set 2
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encoded.append(30) # Upper shift / hibit
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encoded += self._encode_c40_char(chr(o - 128))
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else:
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raise Exception('Cannot encode %s (%s)' % (char, o))
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return encoded
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def _encode_c40(self, value):
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encoded = []
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for c in value:
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encoded += self._encode_c40_char(c)
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while len(encoded) % 3:
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encoded.append(0) # Fake padding that makes chunking in the next step easier
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codewords = []
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codewords.append(230) # Switch to C40 encoding
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for i in range(0, len(encoded), 3):
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chunk = encoded[i:i+3]
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total = chunk[0] * 1600 + chunk[1] * 40 + chunk[2] + 1
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codewords.append(total // 256)
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codewords.append(total % 256)
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codewords.append(254) # End of data
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if len(codewords) > self.cw_data:
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raise Exception('Too much data to fit into a data matrix of this size')
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if len(codewords) < self.cw_data:
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# Real padding
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codewords.append(129) # Start padding
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while len(codewords) < self.cw_data:
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r = ((149 * (len(codewords) + 1)) % 253) + 1
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codewords.append((129 + r) % 254)
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return codewords
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def _gfsum(self, int1, int2):
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return int1 ^ int2
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def _gfproduct(self, int1, int2):
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if int1 == 0 or int2 == 0:
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return 0
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else:
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return ALOGVAL[(LOGVAL[int1] + LOGVAL[int2]) % 255]
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def _get_reed_solomon_code(self, data, num_code_words):
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"""
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This method is basically verbatim from "huBarcode" which is BSD licensed
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https://github.com/hudora/huBarcode/blob/master/hubarcode/datamatrix/reedsolomon.py
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"""
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cw_factors = FACTORS[num_code_words]
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code_words = [0] * num_code_words
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for data_word in data:
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tmp = self._gfsum(data_word, code_words[-1])
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for j in range(num_code_words - 1, -1, -1):
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code_words[j] = self._gfproduct(tmp, cw_factors[j])
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if j > 0:
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code_words[j] = self._gfsum(code_words[j - 1], code_words[j])
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code_words.reverse()
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return code_words
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def _get_next_bits(self, data):
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value = data.pop(0)
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bits = []
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for i in range(0, 8):
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bits.append(value >> i & 1)
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bits.reverse()
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return bits
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def _place_bit(self, row, col, bit):
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if row < 0:
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row += self.row_usable_modules
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col += (4 - ((self.row_usable_modules + 4) % 8))
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if col < 0:
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col += self.col_usable_modules
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row += (4 - ((self.col_usable_modules + 4) % 8))
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self._matrix[row][col] = bit
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def _place_bit_corner_1(self, data):
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bits = self._get_next_bits(data)
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self._place_bit(self.row_usable_modules - 1, 0, bits[0])
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self._place_bit(self.row_usable_modules - 1, 1, bits[1])
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self._place_bit(self.row_usable_modules - 1, 2, bits[2])
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self._place_bit(0, self.col_usable_modules - 2, bits[3])
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self._place_bit(0, self.col_usable_modules - 1, bits[4])
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self._place_bit(1, self.col_usable_modules - 1, bits[5])
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self._place_bit(2, self.col_usable_modules - 1, bits[6])
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self._place_bit(3, self.col_usable_modules - 1, bits[7])
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def _place_bit_corner_2(self, data):
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bits = self._get_next_bits(data)
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self._place_bit(self.row_usable_modules - 3, 0, bits[0])
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self._place_bit(self.row_usable_modules - 2, 0, bits[1])
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self._place_bit(self.row_usable_modules - 1, 0, bits[2])
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self._place_bit(0, self.col_usable_modules - 4, bits[3])
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self._place_bit(0, self.col_usable_modules - 3, bits[4])
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self._place_bit(0, self.col_usable_modules - 2, bits[5])
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self._place_bit(0, self.col_usable_modules - 1, bits[6])
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self._place_bit(1, self.col_usable_modules - 1, bits[7])
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def _place_bit_corner_3(self, data):
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bits = self._get_next_bits(data)
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self._place_bit(self.row_usable_modules - 3, 0, bits[0])
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self._place_bit(self.row_usable_modules - 2, 0, bits[1])
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self._place_bit(self.row_usable_modules - 1, 0, bits[2])
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self._place_bit(0, self.col_usable_modules - 2, bits[3])
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self._place_bit(0, self.col_usable_modules - 1, bits[4])
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self._place_bit(1, self.col_usable_modules - 1, bits[5])
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self._place_bit(2, self.col_usable_modules - 1, bits[6])
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self._place_bit(3, self.col_usable_modules - 1, bits[7])
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def _place_bit_corner_4(self, data):
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bits = self._get_next_bits(data)
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self._place_bit(self.row_usable_modules - 1, 0, bits[0])
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self._place_bit(self.row_usable_modules - 1, self.col_usable_modules - 1, bits[1])
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self._place_bit(0, self.col_usable_modules - 3, bits[2])
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self._place_bit(0, self.col_usable_modules - 2, bits[3])
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self._place_bit(0, self.col_usable_modules - 1, bits[4])
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self._place_bit(1, self.col_usable_modules - 3, bits[5])
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self._place_bit(1, self.col_usable_modules - 2, bits[6])
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self._place_bit(1, self.col_usable_modules - 1, bits[7])
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def _place_bit_standard(self, data, row, col):
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bits = self._get_next_bits(data)
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self._place_bit(row - 2, col - 2, bits[0])
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self._place_bit(row - 2, col - 1, bits[1])
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self._place_bit(row - 1, col - 2, bits[2])
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self._place_bit(row - 1, col - 1, bits[3])
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self._place_bit(row - 1, col, bits[4])
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self._place_bit(row, col - 2, bits[5])
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self._place_bit(row, col - 1, bits[6])
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self._place_bit(row, col, bits[7])
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def _create_matrix(self, data):
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"""
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This method is heavily influenced by "huBarcode" which is BSD licensed
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https://github.com/hudora/huBarcode/blob/master/hubarcode/datamatrix/placement.py
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"""
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rows = self.row_usable_modules
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cols = self.col_usable_modules
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self._matrix = self._create_empty_matrix(rows, cols)
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row = 4
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col = 0
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while True:
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if row == rows and col == 0:
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self._place_bit_corner_1(data)
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elif row == (rows - 2) and col == 0 and (cols % 4):
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self._place_bit_corner_2(data)
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elif row == (rows - 2) and col == 0 and (cols % 8 == 4):
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self._place_bit_corner_3(data)
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elif row == (rows + 4) and col == 2 and (cols % 8 == 0):
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self._place_bit_corner_4(data)
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while True:
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if row < rows and col >= 0 and self._matrix[row][col] is None:
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self._place_bit_standard(data, row, col)
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row -= 2
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col += 2
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if row < 0 or col >= cols:
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break
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row += 1
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col += 3
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while True:
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if row >= 0 and col < cols and self._matrix[row][col] is None:
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self._place_bit_standard(data, row, col)
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row += 2
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col -= 2
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if row >= rows or col < 0:
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break
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row += 3
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col += 1
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if row >= rows and col >= cols:
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break
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for row in self._matrix:
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for i in range(0, cols):
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if row[i] is None:
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row[i] = 0
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return self._matrix
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def _create_data_regions(self, matrix):
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regions = []
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col_offset = 0
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row_offset = 0
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rows = int(self.row_usable_modules / self.row_regions)
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cols = int(self.col_usable_modules / self.col_regions)
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while col_offset < self.row_regions:
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while row_offset < self.col_regions:
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r_offset = col_offset * rows
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c_offset = row_offset * cols
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region = matrix[r_offset:rows+r_offset]
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for i in range(0, len(region)):
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region[i] = region[i][c_offset:cols+c_offset]
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regions.append(region)
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row_offset += 1
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row_offset = 0
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col_offset += 1
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return regions
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def _create_empty_matrix(self, row, col):
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matrix = []
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for i in range(0, row):
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matrix.append([None] * col)
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return matrix
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def _wrap_data_regions_with_finders(self, regions):
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wrapped = []
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for region in regions:
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matrix = self._create_empty_matrix(
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int(self.col_modules / self.col_regions),
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int(self.row_modules / self.row_regions)
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)
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for i, rows in enumerate(region):
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for j, data in enumerate(rows):
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matrix[i+1][j+1] = data
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for i, row in enumerate(matrix):
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if i == 0:
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for j, col in enumerate(row):
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row[j] = (j + 1) % 2
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elif i + 1 == len(matrix):
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for j, col in enumerate(row):
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row[j] = 1
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else:
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row[0] = 1
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row[-1] = i % 2
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wrapped.append(matrix)
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return wrapped
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def _merge_data_regions(self, regions):
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merged = []
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for i in range(0, len(regions), self.row_regions):
|
|
chunk = regions[i:i+self.row_regions]
|
|
j = 0
|
|
while j < len(chunk[0]):
|
|
merged_row = []
|
|
for row in chunk:
|
|
merged_row += row[j]
|
|
merged.append(merged_row)
|
|
j += 1
|
|
|
|
return merged
|
|
|
|
def encode(self):
|
|
if hasattr(self, 'encoded'):
|
|
return self.encoded
|
|
|
|
encoded = self._encode_c40(self.validated)
|
|
encoded += self._get_reed_solomon_code(encoded, self.cw_ecc)
|
|
|
|
matrix = self._create_matrix(encoded)
|
|
data_regions = self._create_data_regions(matrix)
|
|
wrapped = self._wrap_data_regions_with_finders(data_regions)
|
|
self.encoded = self._merge_data_regions(wrapped)
|
|
|
|
self.encoded.reverse() # Helpful since PDFs start at bottom left corner
|
|
|
|
return self.encoded
|
|
|
|
def computeSize(self, *args):
|
|
self._height = self.row_modules * self.barWidth
|
|
self._width = self.col_modules * self.barWidth
|
|
|
|
def draw(self):
|
|
for y, row in enumerate(self.encoded):
|
|
for x, data in enumerate(row):
|
|
if data:
|
|
self.rect(
|
|
self.x + x * self.barWidth,
|
|
self.y + y * self.barWidth,
|
|
self.barWidth,
|
|
self.barWidth
|
|
)
|