You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
3.4 KiB
101 lines
3.4 KiB
#!/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_path, output_path): |
|
processor = TemplateProcessor() |
|
try: |
|
with open(input_path, 'rb') as infile: |
|
with open(output_path, 'wb') as outfile: |
|
for line in infile: |
|
outfile.write(processor.process_line(line)) |
|
except IOError: |
|
print >> sys.stderr, 'failed to process %s' % input_path |
|
|
|
|
|
def main(): |
|
parser = optparse.OptionParser() |
|
parser.add_option('--output-dir', default='') |
|
options, args = parser.parse_args() |
|
for testcase_path in args: |
|
testcase_filename = os.path.basename(testcase_path) |
|
testcase_root, _ = os.path.splitext(testcase_filename) |
|
output_dir = os.path.dirname(testcase_path) |
|
if options.output_dir: |
|
output_dir = options.output_dir |
|
output_path = os.path.join(output_dir, testcase_root + '.pdf') |
|
expand_file(testcase_path, output_path) |
|
return 0 |
|
|
|
|
|
if __name__ == '__main__': |
|
sys.exit(main())
|
|
|