#!/usr/bin/env python
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# Copyright 2014 The PDFium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Expands a hand-written PDF testcase (template) into a valid PDF file.
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There are several places in a PDF file where byte-offsets are required. This
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script replaces {{name}}-style variables in the input with calculated results
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{{header}} - expands to the header comment required for PDF files.
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{{xref}} - expands to a generated xref table, noting the offset.
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{{startxref} - expands to a startxref directive followed by correct offset.
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{{object x y}} - expands to |x y obj| declaration, noting the offset."""
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import optparse
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import os
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import re
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import sys
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class TemplateProcessor:
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HEADER_TOKEN = '{{header}}'
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HEADER_REPLACEMENT = '%PDF-1.7\n%\xa0\xf2\xa4\xf4'
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XREF_TOKEN = '{{xref}}'
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XREF_REPLACEMENT = 'xref\n%d %d\n'
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# XREF rows must be exactly 20 bytes - space required.
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XREF_REPLACEMENT_N = '%010d %05d n \n'
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XREF_REPLACEMENT_F = '0000000000 65535 f \n'
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STARTXREF_TOKEN= '{{startxref}}'
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STARTXREF_REPLACEMENT = 'startxref\n%d'
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OBJECT_PATTERN = r'\{\{object\s+(\d+)\s+(\d+)\}\}'
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OBJECT_REPLACEMENT = r'\1 \2 obj'
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def __init__(self):
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self.offset = 0
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self.xref_offset = 0
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self.max_object_number = 0
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self.objects = { }
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def insert_xref_entry(self, object_number, generation_number):
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self.objects[object_number] = (self.offset, generation_number)
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self.max_object_number = max(self.max_object_number, object_number)
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def generate_xref_table(self):
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result = self.XREF_REPLACEMENT % (0, self.max_object_number + 1)
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for i in range(0, self.max_object_number + 1):
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if i in self.objects:
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result += self.XREF_REPLACEMENT_N % self.objects[i]
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else:
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result += self.XREF_REPLACEMENT_F
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return result
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def process_line(self, line):
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if self.HEADER_TOKEN in line:
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line = line.replace(self.HEADER_TOKEN, self.HEADER_REPLACEMENT)
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if self.XREF_TOKEN in line:
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self.xref_offset = self.offset
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line = self.generate_xref_table()
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if self.STARTXREF_TOKEN in line:
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replacement = self.STARTXREF_REPLACEMENT % self.xref_offset
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line = line.replace(self.STARTXREF_TOKEN, replacement)
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match = re.match(self.OBJECT_PATTERN, line)
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if match:
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self.insert_xref_entry(int(match.group(1)), int(match.group(2)))
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line = re.sub(self.OBJECT_PATTERN, self.OBJECT_REPLACEMENT, line)
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self.offset += len(line)
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return line
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def expand_file(input_path, output_path):
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processor = TemplateProcessor()
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try:
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with open(input_path, 'rb') as infile:
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with open(output_path, 'wb') as outfile:
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for line in infile:
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outfile.write(processor.process_line(line))
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except IOError:
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print >> sys.stderr, 'failed to process %s' % input_path
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def main():
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parser = optparse.OptionParser()
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parser.add_option('--output-dir', default='')
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options, args = parser.parse_args()
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for testcase_path in args:
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testcase_filename = os.path.basename(testcase_path)
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testcase_root, _ = os.path.splitext(testcase_filename)
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output_dir = os.path.dirname(testcase_path)
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if options.output_dir:
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output_dir = options.output_dir
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output_path = os.path.join(output_dir, testcase_root + '.pdf')
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expand_file(testcase_path, output_path)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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