Implement filter for .7z files. Based on rclzip and rcltar

tests/pythonapi/extract.py

@@ -0,0 +1,45 @@
+import sys
+import hashlib
+from recoll import recoll
+from recoll import rclextract
+
+if sys.version_info[0] >= 3:
+    ISP3 = True
+else:
+    ISP3 = False
+
+def utf8string(s):
+    if ISP3:
+        return s
+    else:
+        return s.encode('utf8')
+
+db = recoll.connect()
+query = db.query()
+
+# This normally has only one result, a well-known html file
+nres = query.execute("HtmlAttachment_uniqueTerm", stemming=0)
+print("Result count: %d %d" % (nres, query.rowcount))
+doc = query.fetchone()
+xtrac = rclextract.Extractor(doc)
+doc = xtrac.textextract(doc.ipath)
+print("Text length: %d"%len(doc.text))
+
+refdigest = 'bfbb63f7a245c31767585b45014dbd07'
+
+# This normally has 2 results, one of which is a pdf attachment.
+nres = query.execute("population_size_cultural_transmission", stemming=0)
+for doc in query:
+    if doc.mimetype == 'application/pdf':
+        xtrac = rclextract.Extractor(doc)
+        filename = xtrac.idoctofile(doc.ipath, doc.mimetype)
+        f = open(filename, 'rb')
+        data = f.read()
+        f.close()
+        m = hashlib.md5()
+        m.update(data)
+        digest = m.hexdigest()
+        print(digest)
+        if digest != refdigest:
+            print("extract.py: wrong digest for extracted file!")
+