# -*- coding: utf-8 -*- # # Copyright (c) 1996-2000 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.platypus.flowables import Flowable from reportlab.lib.units import inch import string class Barcode(Flowable): """Abstract Base for barcodes. Includes implementations of some methods suitable for the more primitive barcode types""" def __init__(self, value=''): self.value = value if not hasattr(self, 'gap'): self.gap = None self.validate() self.encode() #print self.encoded self.decompose() #print self.decomposed self.computeSize() def validate(self): self.valid = 1 self.validated = self.value def encode(self): self.encoded = self.validated def decompose(self): self.decomposed = self.encoded def computeSize(self, *args): xdim = self.xdim wx = xdim * self.ratio if self.gap == None: self.gap = xdim w = 0.0 for c in self.decomposed: if c in 'sb': w = w + xdim elif c in 'SB': w = w + wx else: # 'i' w = w + self.gap if self.height is None: self.height = w * 0.15 self.height = max(0.25 * inch, self.height) if self.bearers: self.height = self.height + self.bearers * 2.0 * xdim if self.quiet: w = w + self.lquiet + self.rquiet self.xo = self.lquiet else: self.xo = 0.0 self.width = w def draw(self): xdim = self.xdim wx = xdim * self.ratio left = self.xo b = self.bearers * xdim bb = b * 0.5 tb = self.height - (b * 1.5) for c in self.decomposed: if c == 'i': left = left + self.gap elif c == 's': left = left + xdim elif c == 'S': left = left + wx elif c == 'b': self.rect(left, bb, xdim, tb) left = left + xdim elif c == 'B': self.rect(left, bb, wx, tb) left = left + wx if self.bearers: self.rect(self.lquiet, 0.0, \ self.width - (self.lquiet + self.rquiet), b) self.rect(self.lquiet, self.height - b, \ self.width - (self.lquiet + self.rquiet), b) def rect(self, x, y, w, h): self.canv.rect(x, y, w, h, stroke=0, fill=1) class MultiWidthBarcode(Barcode): """Base for variable-bar-width codes like Code93 and Code128""" def computeSize(self, *args): xdim = self.xdim oa, oA = ord('a') - 1, ord('A') - 1 w = 0.0 for c in self.decomposed: oc = ord(c) if c in string.lowercase: w = w + xdim * (oc - oa) elif c in string.uppercase: w = w + xdim * (oc - oA) if self.height is None: self.height = w * 0.15 self.height = max(0.25 * inch, self.height) if self.quiet: w = w + self.lquiet + self.rquiet self.xo = self.lquiet else: self.xo = 0.0 self.width = w def draw(self): oa, oA = ord('a') - 1, ord('A') - 1 xdim = self.xdim left = self.xo for c in self.decomposed: oc = ord(c) if c in string.lowercase: left = left + (oc - oa) * xdim elif c in string.uppercase: w = (oc - oA) * xdim self.rect(left, 0.0, w, self.height) left = left + w class I2of5(Barcode): """ Interleaved 2 of 5 is a numeric-only barcode. It encodes an even number of digits; if an odd number is given, a 0 is prepended. Options that may be passed to constructor: value (int, or numeric string. required.): The value to encode. xdim (float, default .0075): X-Dimension, or width of the smallest element Minumum is .0075 inch (7.5 mils). ratio (float, default 2.2): The ratio of wide elements to narrow elements. Must be between 2.0 and 3.0 (or 2.2 and 3.0 if the xdim is greater than 20 mils (.02 inch)) gap (float or None, default None): width of intercharacter gap. None means "use xdim". height (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. checksum (bool, default 1): Wether to compute and include the check digit bearers (float, in units of xdim. default 3.0): Height of bearer bars (horizontal bars along the top and bottom of the barcode). Default is 3 x-dimensions. Set to zero for no bearer bars. (Bearer bars help detect misscans, so it is suggested to leave them on). 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 .15 times the symbol's length. rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. Sources of Information on Interleaved 2 of 5: http://www.semiconductor.agilent.com/barcode/sg/Misc/i_25.html http://www.adams1.com/pub/russadam/i25code.html Official Spec, "ANSI/AIM BC2-1995, USS" is available for US$45 from http://www.aimglobal.org/aimstore/ """ patterns = { 'start' : 'bsbs', 'stop' : 'Bsb', 'B0' : 'bbBBb', 'S0' : 'ssSSs', 'B1' : 'BbbbB', 'S1' : 'SsssS', 'B2' : 'bBbbB', 'S2' : 'sSssS', 'B3' : 'BBbbb', 'S3' : 'SSsss', 'B4' : 'bbBbB', 'S4' : 'ssSsS', 'B5' : 'BbBbb', 'S5' : 'SsSss', 'B6' : 'bBBbb', 'S6' : 'sSSss', 'B7' : 'bbbBB', 'S7' : 'sssSS', 'B8' : 'BbbBb', 'S8' : 'SssSs', 'B9' : 'bBbBb', 'S9' : 'sSsSs' } def __init__(self, value='', **args): self.height = None self.xdim = inch * 0.0075 self.ratio = 2.2 self.checksum = 1 self.bearers = 3.0 self.quiet = 1 self.lquiet = self.rquiet = None if type(value) == type(1): value = str(value) for (k, v) in args.items(): setattr(self, k, v) if self.quiet: if self.lquiet is None: self.lquiet = min(inch * 0.25, self.xdim * 10.0) self.rquiet = min(inch * 0.25, self.xdim * 10.0) else: self.lquiet = self.rquiet = 0.0 Barcode.__init__(self, value) def validate(self): vval = "" self.valid = 1 for c in string.strip(self.value): if c not in string.digits: self.valid = 0 continue vval = vval + c self.validated = vval return vval def encode(self): s = self.validated # make sure result will be a multiple of 2 digits long, # checksum included if ((len(self.validated) % 2 == 0) and self.checksum) \ or ((len(self.validated) % 2 == 1) and not self.checksum): s = '0' + s if self.checksum: c = 0 cm = 3 for d in s: c = c + cm * int(d) if cm == 3: cm = 1 else: cm = 3 d = 10 - (int(d) % 10) s = s + `d` self.encoded = s def decompose(self): dval = self.patterns['start'] for i in range(0, len(self.encoded), 2): b = self.patterns['B' + self.encoded[i]] s = self.patterns['S' + self.encoded[i+1]] for i in range(0, len(b)): dval = dval + b[i] + s[i] self.decomposed = dval + self.patterns['stop'] return self.decomposed class MSI(Barcode): """ MSI is a numeric-only barcode. Options that may be passed to constructor: value (int, or numeric string. required.): The value to encode. xdim (float, default .0075): X-Dimension, or width of the smallest element ratio (float, default 2.2): The ratio of wide elements to narrow elements. gap (float or None, default None): width of intercharacter gap. None means "use xdim". height (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. checksum (bool, default 1): Wether to compute and include the check digit bearers (float, in units of xdim. default 0): Height of bearer bars (horizontal bars along the top and bottom of the barcode). Default is 0 (no bearers). 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 xdims. rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. Sources of Information on MSI Bar Code: http://www.semiconductor.agilent.com/barcode/sg/Misc/msi_code.html http://www.adams1.com/pub/russadam/plessy.html """ patterns = { 'start' : 'Bs', 'stop' : 'bSb', '0' : 'bSbSbSbS', '1' : 'bSbSbSBs', '2' : 'bSbSBsbS', '3' : 'bSbSBsBs', '4' : 'bSBsbSbS', '5' : 'bSBsbSBs', '6' : 'bSBsBsbS', '7' : 'bSBsBsBs', '8' : 'BsbSbSbS', '9' : 'BsbSbSBs' } def __init__(self, value="", **args): self.height = None self.xdim = inch * 0.0075 self.ratio = 2.2 self.checksum = 1 self.bearers = 0.0 self.quiet = 1 self.lquiet = self.rquiet = None if type(value) == type(1): value = str(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.xdim * 10.0) self.rquiet = max(inch * 0.25, self.xdim * 10.0) else: self.lquiet = self.rquiet = 0.0 Barcode.__init__(self, value) def validate(self): vval = "" self.valid = 1 for c in string.strip(self.value): if c not in string.digits: self.valid = 0 continue vval = vval + c self.validated = vval return vval def encode(self): s = self.validated if self.checksum: c = '' for i in range(1, len(s), 2): c = c + s[i] d = str(int(c) * 2) t = 0 for c in d: t = t + int(c) for i in range(0, len(s), 2): t = t + int(s[i]) c = 10 - (t % 10) s = s + str(c) self.encoded = s def decompose(self): dval = self.patterns['start'] for c in self.encoded: dval = dval + self.patterns[c] self.decomposed = dval + self.patterns['stop'] return self.decomposed class Codabar(Barcode): """ Codabar is a numeric plus some puntuation ("-$:/.+") barcode with four start/stop characters (A, B, C, and D). Options that may be passed to constructor: value (string. required.): The value to encode. xdim (float, default .0065): X-Dimension, or width of the smallest element minimum is 6.5 mils (.0065 inch) ratio (float, default 2.0): The ratio of wide elements to narrow elements. gap (float or None, default None): width of intercharacter gap. None means "use xdim". height (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. checksum (bool, default 0): Wether to compute and include the check digit bearers (float, in units of xdim. default 0): Height of bearer bars (horizontal bars along the top and bottom of the barcode). Default is 0 (no bearers). 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 xdim rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. Sources of Information on Codabar http://www.semiconductor.agilent.com/barcode/sg/Misc/codabar.html http://www.barcodeman.com/codabar.html Official Spec, "ANSI/AIM BC3-1995, USS" is available for US$45 from http://www.aimglobal.org/aimstore/ """ patterns = { '0': 'bsbsbSB', '1': 'bsbsBSb', '2': 'bsbSbsB', '3': 'BSbsbsb', '4': 'bsBsbSb', '5': 'BsbsbSb', '6': 'bSbsbsB', '7': 'bSbsBsb', '8': 'bSBsbsb', '9': 'BsbSbsb', '-': 'bsbSBsb', '$': 'bsBSbsb', ':': 'BsbsBsB', '/': 'BsBsbsB', '.': 'BsBsBsb', '+': 'bsBsBsB', 'A': 'bsBSbSb', 'B': 'bSbSbsB', 'C': 'bsbSbSB', 'D': 'bsbSBSb' } values = { '0' : 0, '1' : 1, '2' : 2, '3' : 3, '4' : 4, '5' : 5, '6' : 6, '7' : 7, '8' : 8, '9' : 9, '-' : 10, '$' : 11, ':' : 12, '/' : 13, '.' : 14, '+' : 15, 'A' : 16, 'B' : 17, 'C' : 18, 'D' : 19 } chars = string.digits + "-$:/.+" def __init__(self, value='', **args): self.height = None self.xdim = inch * 0.0065 self.ratio = 2.0 # XXX ? self.checksum = 0 self.bearers = 0.0 self.quiet = 1 self.lquiet = self.rquiet = None if type(value) == type(1): value = str(value) for (k, v) in args.items(): setattr(self, k, v) if self.quiet: if self.lquiet is None: self.lquiet = min(inch * 0.25, self.xdim * 10.0) self.rquiet = min(inch * 0.25, self.xdim * 10.0) else: self.lquiet = self.rquiet = 0.0 Barcode.__init__(self, value) def validate(self): vval = "" self.valid = 1 s = string.strip(self.value) for i in range(0, len(s)): c = s[i] if c not in self.chars: if ((i != 0) and (i != len(s) - 1)) or (c not in 'ABCD'): self.Valid = 0 continue vval = vval + c if vval[0] not in 'ABCD': vval = 'A' + vval if vval[-1] not in 'ABCD': vval = vval + vval[0] self.validated = vval return vval def encode(self): s = self.validated if self.checksum: v = 0 for c in s: v = v + self.values[v] v = 16 - (v % 16) s = s + self.chars[v] self.encoded = s def decompose(self): dval = "" for c in self.encoded: dval = dval + self.patterns[c] + 'i' self.decomposed = dval[:-1] return self.decomposed class Code11(Barcode): """ Code 11 is an almost-numeric barcode. It encodes the digits 0-9 plus dash ("-"). 11 characters total, hence the name. value (int or string. required.): The value to encode. xdim (float, default .0075): X-Dimension, or width of the smallest element ratio (float, default 2.2): The ratio of wide elements to narrow elements. gap (float or None, default None): width of intercharacter gap. None means "use xdim". height (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. checksum (0 none, 1 1-digit, 2 2-digit, -1 auto, default -1): How many checksum digits to include. -1 ("auto") means 1 if the number of digits is 10 or less, else 2. bearers (float, in units of xdim. default 0): Height of bearer bars (horizontal bars along the top and bottom of the barcode). Default is 0 (no bearers). 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 xdim rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. Sources of Information on Code 11: http://www.cwi.nl/people/dik/english/codes/barcodes.html """ chars = string.digits + '-' patterns = { '0' : 'bsbsB', '1' : 'BsbsB', '2' : 'bSbsB', '3' : 'BSbsb', '4' : 'bsBsB', '5' : 'BsBsb', '6' : 'bSBsb', '7' : 'bsbSB', '8' : 'BsbSb', '9' : 'Bsbsb', '-' : 'bsBsb', 'S' : 'bsBSb' # Start/Stop } values = { '0' : 0, '1' : 1, '2' : 2, '3' : 3, '4' : 4, '5' : 5, '6' : 6, '7' : 7, '8' : 8, '9' : 9, '-' : 10, } def __init__(self, value='', **args): self.height = None self.xdim = inch * 0.0075 self.ratio = 2.2 # XXX ? self.checksum = -1 # Auto self.bearers = 0.0 self.quiet = 1 self.lquiet = self.rquiet = None if type(value) == type(1): value = str(value) for (k, v) in args.items(): setattr(self, k, v) if self.quiet: if self.lquiet is None: self.lquiet = min(inch * 0.25, self.xdim * 10.0) self.rquiet = min(inch * 0.25, self.xdim * 10.0) else: self.lquiet = self.rquiet = 0.0 Barcode.__init__(self, value) def validate(self): vval = "" self.valid = 1 s = string.strip(self.value) for i in range(0, len(s)): c = s[i] if c not in self.chars: self.Valid = 0 continue vval = vval + c self.validated = vval return vval def encode(self): s = self.validated if self.checksum == -1: if len(s) <= 10: self.checksum = 1 else: self.checksum = 2 if self.checksum > 0: # compute first checksum i = 0; v = 1; c = 0 while i < len(s): c = c + v * string.index(self.chars, s[-(i+1)]) i = i + 1; v = v + 1 if v > 10: v = 1 s = s + self.chars[c % 11] if self.checksum > 1: # compute second checksum i = 0; v = 1; c = 0 while i < len(s): c = c + v * string.index(self.chars, s[-(i+1)]) i = i + 1; v = v + 1 if v > 9: v = 1 s = s + self.chars[c % 10] self.encoded = 'S' + s + 'S' def decompose(self): dval = "" for c in self.encoded: dval = dval + self.patterns[c] + 'i' self.decomposed = dval[:-1] return self.decomposed # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: