# # Copyright (c) 2000 Tyler C. Sarna # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # 3. All advertising materials mentioning features or use of this software # must display the following acknowledgement: # This product includes software developed by Tyler C. Sarna. # 4. Neither the name of the author nor the names of contributors # may be used to endorse or promote products derived from this software # without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. # from reportlab.lib.units import inch from reportlab.lib.utils import asNative from reportlab.graphics.barcode.common import MultiWidthBarcode _patterns = { '0' : ('AcAaAb', 0), '1' : ('AaAbAc', 1), '2' : ('AaAcAb', 2), '3' : ('AaAdAa', 3), '4' : ('AbAaAc', 4), '5' : ('AbAbAb', 5), '6' : ('AbAcAa', 6), '7' : ('AaAaAd', 7), '8' : ('AcAbAa', 8), '9' : ('AdAaAa', 9), 'A' : ('BaAaAc', 10), 'B' : ('BaAbAb', 11), 'C' : ('BaAcAa', 12), 'D' : ('BbAaAb', 13), 'E' : ('BbAbAa', 14), 'F' : ('BcAaAa', 15), 'G' : ('AaBaAc', 16), 'H' : ('AaBbAb', 17), 'I' : ('AaBcAa', 18), 'J' : ('AbBaAb', 19), 'K' : ('AcBaAa', 20), 'L' : ('AaAaBc', 21), 'M' : ('AaAbBb', 22), 'N' : ('AaAcBa', 23), 'O' : ('AbAaBb', 24), 'P' : ('AcAaBa', 25), 'Q' : ('BaBaAb', 26), 'R' : ('BaBbAa', 27), 'S' : ('BaAaBb', 28), 'T' : ('BaAbBa', 29), 'U' : ('BbAaBa', 30), 'V' : ('BbBaAa', 31), 'W' : ('AaBaBb', 32), 'X' : ('AaBbBa', 33), 'Y' : ('AbBaBa', 34), 'Z' : ('AbCaAa', 35), '-' : ('AbAaCa', 36), '.' : ('CaAaAb', 37), ' ' : ('CaAbAa', 38), '$' : ('CbAaAa', 39), '/' : ('AaBaCa', 40), '+' : ('AaCaBa', 41), '%' : ('BaAaCa', 42), '#' : ('AbAbBa', 43), '!' : ('CaBaAa', 44), '=' : ('CaAaBa', 45), '&' : ('AbBbAa', 46), 'start' : ('AaAaDa', -1), 'stop' : ('AaAaDaA', -2) } _charsbyval = {} for k, v in _patterns.items(): _charsbyval[v[1]] = k _extended = { '\x00' : '!U', '\x01' : '#A', '\x02' : '#B', '\x03' : '#C', '\x04' : '#D', '\x05' : '#E', '\x06' : '#F', '\x07' : '#G', '\x08' : '#H', '\x09' : '#I', '\x0a' : '#J', '\x0b' : '#K', '\x0c' : '#L', '\x0d' : '#M', '\x0e' : '#N', '\x0f' : '#O', '\x10' : '#P', '\x11' : '#Q', '\x12' : '#R', '\x13' : '#S', '\x14' : '#T', '\x15' : '#U', '\x16' : '#V', '\x17' : '#W', '\x18' : '#X', '\x19' : '#Y', '\x1a' : '#Z', '\x1b' : '!A', '\x1c' : '!B', '\x1d' : '!C', '\x1e' : '!D', '\x1f' : '!E', '!' : '=A', '"' : '=B', '#' : '=C', '$' : '=D', '%' : '=E', '&' : '=F', '\'' : '=G', '(' : '=H', ')' : '=I', '*' : '=J', '+' : '=K', ',' : '=L', '/' : '=O', ':' : '=Z', ';' : '!F', '<' : '!G', '=' : '!H', '>' : '!I', '?' : '!J', '@' : '!V', '[' : '!K', '\\' : '!L', ']' : '!M', '^' : '!N', '_' : '!O', '`' : '!W', 'a' : '&A', 'b' : '&B', 'c' : '&C', 'd' : '&D', 'e' : '&E', 'f' : '&F', 'g' : '&G', 'h' : '&H', 'i' : '&I', 'j' : '&J', 'k' : '&K', 'l' : '&L', 'm' : '&M', 'n' : '&N', 'o' : '&O', 'p' : '&P', 'q' : '&Q', 'r' : '&R', 's' : '&S', 't' : '&T', 'u' : '&U', 'v' : '&V', 'w' : '&W', 'x' : '&X', 'y' : '&Y', 'z' : '&Z', '{' : '!P', '|' : '!Q', '}' : '!R', '~' : '!S', '\x7f' : '!T' } def _encode93(str): s = list(str) s.reverse() # compute 'C' checksum i = 0; v = 1; c = 0 while i < len(s): c = c + v * _patterns[s[i]][1] i = i + 1; v = v + 1 if v > 20: v = 1 s.insert(0, _charsbyval[c % 47]) # compute 'K' checksum i = 0; v = 1; c = 0 while i < len(s): c = c + v * _patterns[s[i]][1] i = i + 1; v = v + 1 if v > 15: v = 1 s.insert(0, _charsbyval[c % 47]) s.reverse() return ''.join(s) class _Code93Base(MultiWidthBarcode): barWidth = inch * 0.0075 lquiet = None rquiet = None quiet = 1 barHeight = None stop = 1 def __init__(self, value='', **args): if type(value) is type(1): value = asNative(value) for (k, v) in args.items(): setattr(self, k, v) if self.quiet: if self.lquiet is None: self.lquiet = max(inch * 0.25, self.barWidth * 10.0) self.rquiet = max(inch * 0.25, self.barWidth * 10.0) else: self.lquiet = self.rquiet = 0.0 MultiWidthBarcode.__init__(self, value) def decompose(self): dval = self.stop and [_patterns['start'][0]] or [] dval += [_patterns[c][0] for c in self.encoded] if self.stop: dval.append(_patterns['stop'][0]) self.decomposed = ''.join(dval) return self.decomposed class Standard93(_Code93Base): """ Code 93 is a Uppercase alphanumeric symbology with some punctuation. See Extended Code 93 for a variant that can represent the entire 128 characrter ASCII set. Options that may be passed to constructor: value (int, or numeric string. required.): The value to encode. barWidth (float, default .0075): X-Dimension, or width of the smallest element Minumum is .0075 inch (7.5 mils). barHeight (float, see default below): Height of the symbol. Default is the height of the two bearer bars (if they exist) plus the greater of .25 inch or .15 times the symbol's length. quiet (bool, default 1): Wether to include quiet zones in the symbol. lquiet (float, see default below): Quiet zone size to left of code, if quiet is true. Default is the greater of .25 inch, or 10 barWidth rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. stop (bool, default 1): Whether to include start/stop symbols. Sources of Information on Code 93: http://www.semiconductor.agilent.com/barcode/sg/Misc/code_93.html Official Spec, "NSI/AIM BC5-1995, USS" is available for US$45 from http://www.aimglobal.org/aimstore/ """ def validate(self): vval = "" self.valid = 1 for c in self.value.upper(): if c not in _patterns: self.valid = 0 continue vval = vval + c self.validated = vval return vval def encode(self): self.encoded = _encode93(self.validated) return self.encoded class Extended93(_Code93Base): """ Extended Code 93 is a convention for encoding the entire 128 character set using pairs of characters to represent the characters missing in Standard Code 93. It is very much like Extended Code 39 in that way. See Standard93 for arguments. """ def validate(self): vval = [] self.valid = 1 a = vval.append for c in self.value: if c not in _patterns and c not in _extended: self.valid = 0 continue a(c) self.validated = ''.join(vval) return self.validated def encode(self): self.encoded = "" for c in self.validated: if c in _patterns: self.encoded = self.encoded + c elif c in _extended: self.encoded = self.encoded + _extended[c] else: raise ValueError self.encoded = _encode93(self.encoded) return self.encoded def _humanText(self): return self.validated+self.encoded[-2:]