/usr/lib/python2.7/dist-packages/reportlab/graphics/barcode/common.py is in python-reportlab 3.0-1build1.
This file is owned by root:root, with mode 0o644.
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# Copyright (c) 1996-2000 Tyler C. Sarna <tsarna@sarna.org>
# 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
from reportlab.lib.utils import ascii_uppercase, ascii_lowercase
from string import digits as string_digits
class Barcode(Flowable):
"""Abstract Base for barcodes. Includes implementations of
some methods suitable for the more primitive barcode types"""
fontName = 'Courier'
fontSize = 12
humanReadable = 0
def _humanText(self):
return self.encoded
def __init__(self, value='',**kwd):
self.value = str(value)
self._setKeywords(**kwd)
if not hasattr(self, 'gap'):
self.gap = None
def _calculate(self):
self.validate()
self.encode()
self.decompose()
self.computeSize()
def _setKeywords(self,**kwd):
for (k, v) in kwd.items():
setattr(self, k, v)
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):
barWidth = self.barWidth
wx = barWidth * self.ratio
if self.gap == None:
self.gap = barWidth
w = 0.0
for c in self.decomposed:
if c in 'sb':
w = w + barWidth
elif c in 'SB':
w = w + wx
else: # 'i'
w = w + self.gap
if self.barHeight is None:
self.barHeight = w * 0.15
self.barHeight = max(0.25 * inch, self.barHeight)
if self.bearers:
self.barHeight = self.barHeight + self.bearers * 2.0 * barWidth
if self.quiet:
w += self.lquiet + self.rquiet
self._height = self.barHeight
self._width = w
def width(self):
self._calculate()
return self._width
width = property(width)
def height(self):
self._calculate()
return self._height
height = property(height)
def draw(self):
self._calculate()
barWidth = self.barWidth
wx = barWidth * self.ratio
left = self.quiet and self.lquiet or 0
b = self.bearers * barWidth
bb = b * 0.5
tb = self.barHeight - (b * 1.5)
for c in self.decomposed:
if c == 'i':
left = left + self.gap
elif c == 's':
left = left + barWidth
elif c == 'S':
left = left + wx
elif c == 'b':
self.rect(left, bb, barWidth, tb)
left = left + barWidth
elif c == 'B':
self.rect(left, bb, wx, tb)
left = left + wx
if self.bearers:
self.rect(self.lquiet, 0, \
self._width - (self.lquiet + self.rquiet), b)
self.rect(self.lquiet, self.barHeight - b, \
self._width - (self.lquiet + self.rquiet), b)
self.drawHumanReadable()
def drawHumanReadable(self):
if self.humanReadable:
#we have text
from reportlab.pdfbase.pdfmetrics import getAscent, stringWidth
s = str(self._humanText())
fontSize = self.fontSize
fontName = self.fontName
w = stringWidth(s,fontName,fontSize)
width = self._width
if self.quiet:
width -= self.lquiet+self.rquiet
x = self.lquiet
else:
x = 0
if w>width: fontSize *= width/float(w)
y = 1.07*getAscent(fontName)*fontSize/1000.
self.annotate(x+width/2.,-y,s,fontName,fontSize)
def rect(self, x, y, w, h):
self.canv.rect(x, y, w, h, stroke=0, fill=1)
def annotate(self,x,y,text,fontName,fontSize,anchor='middle'):
canv = self.canv
canv.saveState()
canv.setFont(self.fontName,fontSize)
if anchor=='middle': func = 'drawCentredString'
elif anchor=='end': func = 'drawRightString'
else: func = 'drawString'
getattr(canv,func)(x,y,text)
canv.restoreState()
class MultiWidthBarcode(Barcode):
"""Base for variable-bar-width codes like Code93 and Code128"""
def computeSize(self, *args):
barWidth = self.barWidth
oa, oA = ord('a') - 1, ord('A') - 1
w = 0.0
for c in self.decomposed:
oc = ord(c)
if c in ascii_lowercase:
w = w + barWidth * (oc - oa)
elif c in ascii_uppercase:
w = w + barWidth * (oc - oA)
if self.barHeight is None:
self.barHeight = w * 0.15
self.barHeight = max(0.25 * inch, self.barHeight)
if self.quiet:
w += self.lquiet + self.rquiet
self._height = self.barHeight
self._width = w
def draw(self):
self._calculate()
oa, oA = ord('a') - 1, ord('A') - 1
barWidth = self.barWidth
left = self.quiet and self.lquiet or 0
for c in self.decomposed:
oc = ord(c)
if c in ascii_lowercase:
left = left + (oc - oa) * barWidth
elif c in ascii_uppercase:
w = (oc - oA) * barWidth
self.rect(left, 0, w, self.barHeight)
left += w
self.drawHumanReadable()
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.
barWidth (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
barWidth is greater than 20 mils (.02 inch))
gap (float or None, default None):
width of intercharacter gap. None means "use barWidth".
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.
checksum (bool, default 1):
Whether to compute and include the check digit
bearers (float, in units of barWidth. 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):
Whether 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.
stop (bool, default 1):
Whether to include start/stop symbols.
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'
}
barHeight = None
barWidth = inch * 0.0075
ratio = 2.2
checksum = 1
bearers = 3.0
quiet = 1
lquiet = None
rquiet = None
stop = 1
def __init__(self, value='', **args):
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.barWidth * 10.0)
self.rquiet = min(inch * 0.25, self.barWidth * 10.0)
else:
self.lquiet = self.rquiet = 0.0
Barcode.__init__(self, value)
def validate(self):
vval = ""
self.valid = 1
for c in self.value.strip():
if c not in string_digits:
self.valid = 0
continue
vval = vval + c
self.validated = vval
return vval
def encode(self):
s = self.validated
cs = self.checksum
c = len(s)
#ensure len(result)%2 == 0, checksum included
if ((c % 2 == 0) and cs) or ((c % 2 == 1) and not cs):
s = '0' + s
c += 1
if cs:
c = 3*sum([int(s[i]) for i in range(0,c,2)])+sum([int(s[i]) for i in range(1,c,2)])
s += str((10 - c) % 10)
self.encoded = s
def decompose(self):
dval = self.stop and [self.patterns['start']] or []
a = dval.append
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)):
a(b[i] + s[i])
if self.stop: a(self.patterns['stop'])
self.decomposed = ''.join(dval)
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.
barWidth (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 barWidth".
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.
checksum (bool, default 1):
Wether to compute and include the check digit
bearers (float, in units of barWidth. 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 barWidths.
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 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'
}
stop = 1
barHeight = None
barWidth = inch * 0.0075
ratio = 2.2
checksum = 1
bearers = 0.0
quiet = 1
lquiet = None
rquiet = None
def __init__(self, value="", **args):
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.barWidth * 10.0)
self.rquiet = max(inch * 0.25, self.barWidth * 10.0)
else:
self.lquiet = self.rquiet = 0.0
Barcode.__init__(self, value)
def validate(self):
vval = ""
self.valid = 1
for c in self.value.strip():
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.stop and [self.patterns['start']] or []
dval += [self.patterns[c] for c in self.encoded]
if self.stop: dval.append(self.patterns['stop'])
self.decomposed = ''.join(dval)
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.
barWidth (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 barWidth".
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.
checksum (bool, default 0):
Whether to compute and include the check digit
bearers (float, in units of barWidth. 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):
Whether to include quiet zones in the symbol.
stop (bool, default 1):
Whether to include start/stop symbols.
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.
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, '$' : 11, ':' : 12, '/' : 13, '.' : 14,
'+' : 15, 'A' : 16, 'B' : 17, 'C' : 18, 'D' : 19
}
chars = string_digits + "-$:/.+"
stop = 1
barHeight = None
barWidth = inch * 0.0065
ratio = 2.0 # XXX ?
checksum = 0
bearers = 0.0
quiet = 1
lquiet = None
rquiet = None
def __init__(self, value='', **args):
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.barWidth * 10.0)
self.rquiet = min(inch * 0.25, self.barWidth * 10.0)
else:
self.lquiet = self.rquiet = 0.0
Barcode.__init__(self, value)
def validate(self):
vval = ""
self.valid = 1
s = self.value.strip()
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 self.stop:
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 = sum([self.values[c] for c in s])
s += self.chars[v % 16]
self.encoded = s
def decompose(self):
dval = ''.join([self.patterns[c]+'i' for c in self.encoded])
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.
barWidth (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 barWidth".
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.
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 barWidth. 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 barWidth
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 = '0123456789-'
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,
}
stop = 1
barHeight = None
barWidth = inch * 0.0075
ratio = 2.2 # XXX ?
checksum = -1 # Auto
bearers = 0.0
quiet = 1
lquiet = None
rquiet = None
def __init__(self, value='', **args):
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.barWidth * 10.0)
self.rquiet = min(inch * 0.25, self.barWidth * 10.0)
else:
self.lquiet = self.rquiet = 0.0
Barcode.__init__(self, value)
def validate(self):
vval = ""
self.valid = 1
s = self.value.strip()
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 _addCSD(self,s,m):
# compute first checksum
i = c = 0
v = 1
V = self.values
while i < len(s):
c += v * V[s[-(i+1)]]
i += 1
v += 1
if v==m:
v = 1
return s+self.chars[c % 11]
def encode(self):
s = self.validated
tcs = self.checksum
if tcs<0:
self.checksum = tcs = 1+int(len(s)>10)
if tcs > 0: s = self._addCSD(s,11)
if tcs > 1: s = self._addCSD(s,10)
self.encoded = self.stop and ('S' + s + 'S') or s
def decompose(self):
self.decomposed = ''.join([(self.patterns[c]+'i') for c in self.encoded])[:-1]
return self.decomposed
def _humanText(self):
return self.stop and self.encoded[1:-1] or self.encoded
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