First public commit

PolyglotFile/polyglotpdfzip.py

@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+
+import logging
+
+'''
+    |-------------------------------|    -
+    |--------- PDF Header ----------K1   | J1
+    |-------------------------------|    -
+    |----- PDF OBJ 1 = ZIP Data ----K2   |
+    |-------------------------------|    -
+    |---- Original PDF Ojbects -----K3   | J2
+    |-------------------------------|    -
+    |--- Last OBJ = End Zip Data ---K4   |
+    |-------------------------------|    |
+    |---------- Xref Table ---------|    |
+    |-------------------------------K5   |
+    |----------- Trailer -----------|    |
+    |-------------------------------|    |
+'''
+
+
+class PolyglotPdfZip():
+    from PdfFileTransformer import Pdf
+    from ZipFileTransformer import Zip
+
+    def __init__(self, Pdf, Zip):
+        self.buffer = bytearray()
+        self.pdf = Pdf
+        self.zip = Zip
+        self.buffer = bytearray()
+
+    def generate(self):
+        k2_stream = self.zip.buffer[:self.zip.end_of_data]
+        size_k2_stream = len(k2_stream)
+        self.pdf.insert_new_obj_stream_at_start(k2_stream)
+        offset_k2_stream = self.pdf.get_first_stream_offset()
+
+        k4_stream = self.zip.buffer[self.zip.central_dir_file_header:]
+        size_k4_stream = len(k4_stream)
+        self.pdf.insert_new_obj_stream_at_end(k4_stream)
+        offset_k4_stream = self.pdf.get_last_stream_offset()
+
+        pdf_buffer = self.pdf.get_build_buffer()
+
+        j1 = pdf_buffer[0:offset_k2_stream]
+        j2 = pdf_buffer[offset_k2_stream + size_k2_stream:offset_k4_stream]
+        self.zip.add_data_to_file(j1, j2, True)
+
+        k5 = pdf_buffer[offset_k4_stream + size_k4_stream:]
+        self.buffer = self.zip.buffer + k5
+
+    def write(self, filename):
+        fd = open(filename, "wb")
+        fd.write(self.buffer)
+        fd.close()