/usr/lib/python2.7/dist-packages/pdfminer/runlength.py is in python-pdfminer 20140328+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!/usr/bin/env python
#
# RunLength decoder (Adobe version) implementation based on PDF Reference
# version 1.4 section 3.3.4.
#
# * public domain *
#
def rldecode(data):
"""
RunLength decoder (Adobe version) implementation based on PDF Reference
version 1.4 section 3.3.4:
The RunLengthDecode filter decodes data that has been encoded in a
simple byte-oriented format based on run length. The encoded data
is a sequence of runs, where each run consists of a length byte
followed by 1 to 128 bytes of data. If the length byte is in the
range 0 to 127, the following length + 1 (1 to 128) bytes are
copied literally during decompression. If length is in the range
129 to 255, the following single byte is to be copied 257 - length
(2 to 128) times during decompression. A length value of 128
denotes EOD.
>>> s = "\x05123456\xfa7\x04abcde\x80junk"
>>> rldecode(s)
'1234567777777abcde'
"""
decoded = []
i = 0
while i < len(data):
#print "data[%d]=:%d:" % (i,ord(data[i]))
length = ord(data[i])
if length == 128:
break
if length >= 0 and length < 128:
run = data[i+1:(i+1)+(length+1)]
#print "length=%d, run=%s" % (length+1,run)
decoded.append(run)
i = (i+1) + (length+1)
if length > 128:
run = data[i+1]*(257-length)
#print "length=%d, run=%s" % (257-length,run)
decoded.append(run)
i = (i+1) + 1
return ''.join(decoded)
if __name__ == '__main__':
import doctest
doctest.testmod()
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