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61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
12 years ago
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#!/usr/bin/python
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import sys, os, argparse
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parser = argparse.ArgumentParser(description='Fixes PDFs that are output by tiff2pdf, to get rid of the pink and green color overlay issue.')
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parser.add_argument('files', metavar='FILE', type=str, nargs='+',
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help='files to fix')
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args = parser.parse_args()
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options = vars(args)
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def chunked_replace(original_file, target_file, chunk_size, find, replace):
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original = open(original_file, "rb")
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target = open(target_file, "wb")
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position = 0
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while True:
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# Read a normally sized chunk.
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data = str(original.read(chunk_size))
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# Replace all data immediately available in this read.
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new_data = data.replace(find, replace)
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# Check for partial matches. We will loop this to deal with false positives when the partial match
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# turned out to be random, but another partial match follows immediately afterwards the original
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# read.
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while True:
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found = False
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# We will go from a large substring to a small substring to avoid false positives.
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# If we went the other way around, repetitive patterns in the substring might cause havoc.
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for length in reversed(xrange(1, len(find))):
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if new_data.endswith(find[:length]):
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# Partial match found.
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missing_bytes = len(match_string) - length
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new_data += str(original_file.read(missing_bytes))
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new_data = new_data.replace(find, replace)
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found = True
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if found == False:
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# No more partial matches to deal with here.
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break
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target.write(new_data)
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if data == "":
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break
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else:
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position += chunk_size
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original.close()
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target.close()
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for item in options['files']:
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base_name, extension = os.path.splitext(os.path.basename(item))
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base_path = os.path.dirname(item)
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target_file = "%s/%s_fixed.%s" % (base_path, base_name, extension)
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chunked_replace(item, target_file, 512 * 1024, b"ColorTransform 0", b"ColorTransform 1")
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