83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <http://unlicense.org/>
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"""
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import logging
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'''
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|-------------------------------| -
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|--------- PDF Header ----------K1 | J1
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|-------------------------------| -
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|----- PDF OBJ 1 = ZIP Data ----K2 |
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|-------------------------------| -
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|---- Original PDF Ojbects -----K3 | J2
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|-------------------------------| -
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|--- Last OBJ = End Zip Data ---K4 |
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|-------------------------------| |
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|---------- Xref Table ---------| |
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|-------------------------------K5 |
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|----------- Trailer -----------| |
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|-------------------------------| |
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'''
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class PolyglotPdfZip():
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from PdfFileTransformer import Pdf
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from ZipFileTransformer import Zip
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def __init__(self, Pdf, Zip):
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self.buffer = bytearray()
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self.pdf = Pdf
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self.zip = Zip
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self.buffer = bytearray()
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def generate(self):
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k2_stream = self.zip.buffer[:self.zip.end_of_data]
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size_k2_stream = len(k2_stream)
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self.pdf.insert_new_obj_stream_at_start(k2_stream)
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offset_k2_stream = self.pdf.get_first_stream_offset()
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k4_stream = self.zip.buffer[self.zip.central_dir_file_header:]
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size_k4_stream = len(k4_stream)
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self.pdf.insert_new_obj_stream_at_end(k4_stream)
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offset_k4_stream = self.pdf.get_last_stream_offset()
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pdf_buffer = self.pdf.get_build_buffer()
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j1 = pdf_buffer[0:offset_k2_stream]
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j2 = pdf_buffer[offset_k2_stream + size_k2_stream:offset_k4_stream]
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self.zip.add_data_to_file(j1, j2, True)
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k5 = pdf_buffer[offset_k4_stream + size_k4_stream:]
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self.buffer = self.zip.buffer + k5
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def write(self, filename):
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fd = open(filename, "wb")
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fd.write(self.buffer)
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fd.close()
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