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