From ecaf68efed830ee77e09b61d487dbed2b7508174 Mon Sep 17 00:00:00 2001
From: "yusuke.shinyama.dummy"
 <yusuke.shinyama.dummy@1aa58f4a-7d42-0410-adbc-911cccaed67c>
Date: Sun, 27 Apr 2008 04:34:41 +0000
Subject: [PATCH] add some restriction

git-svn-id: https://pdfminerr.googlecode.com/svn/trunk/pdfminer@22 1aa58f4a-7d42-0410-adbc-911cccaed67c
---
 lzw.py     | 1 -
 pdf2txt.py | 3 +++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/lzw.py b/lzw.py
index 8081a48..0dde44d 100755
--- a/lzw.py
+++ b/lzw.py
@@ -17,7 +17,6 @@ class LZWDecoder:
     return
 
   def readbits(self, bits):
-    bits0 = bits
     v = 0
     while 1:
       # the number of remaining bits we can get from the current buffer.
diff --git a/pdf2txt.py b/pdf2txt.py
index b5aa353..217547d 100755
--- a/pdf2txt.py
+++ b/pdf2txt.py
@@ -163,11 +163,14 @@ class TextConverter(PDFDevice):
 
 
 # pdf2txt
+class TextExtractionNotAllowed(RuntimeError): pass
 def pdf2txt(outfp, rsrc, fname, pages, codec, debug=0):
   device = TextConverter(rsrc, debug=debug)
   doc = PDFDocument(debug=debug)
   fp = file(fname)
   parser = PDFParser(doc, fp, debug=debug)
+  if not doc.is_extractable:
+    raise TextExtractionNotAllowed('text extraction is not allowed: %r' % fname)
   interpreter = PDFPageInterpreter(rsrc, device, debug=debug)
   outfp.write('<document>\n')
   for (i,page) in enumerate(doc.get_pages(debug=debug)):