This patch changes the default behaviour of the builtin charmap
codec to not apply Latin-1 mappings for keys which are not found
in the mapping dictionaries, but instead treat them as undefined
mappings.

The patch was originally written by Martin v. Loewis with some
additional (cosmetic) changes and an updated test script
by Marc-Andre Lemburg.

The standard codecs were recreated from the most current files
available at the Unicode.org site using the Tools/scripts/gencodec.py
tool.

This patch closes the bugs #116285 and #119960.
diff --git a/Lib/encodings/iso8859_6.py b/Lib/encodings/iso8859_6.py
index b4d4315..585fa11 100644
--- a/Lib/encodings/iso8859_6.py
+++ b/Lib/encodings/iso8859_6.py
@@ -1,9 +1,9 @@
-""" Python Character Mapping Codec generated from '8859-6.TXT'.
-
+""" Python Character Mapping Codec generated from '8859-6.TXT' with gencodec.py.
 
 Written by Marc-Andre Lemburg (mal@lemburg.com).
 
 (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
+(c) Copyright 2000 Guido van Rossum.
 
 """#"
 
@@ -35,11 +35,38 @@
 
 ### Decoding Map
 
-decoding_map = {
-
+decoding_map = codecs.make_identity_dict(range(256))
+decoding_map.update({
+	0x00a1: None,
+	0x00a2: None,
+	0x00a3: None,
+	0x00a5: None,
+	0x00a6: None,
+	0x00a7: None,
+	0x00a8: None,
+	0x00a9: None,
+	0x00aa: None,
+	0x00ab: None,
 	0x00ac: 0x060c,	# 	ARABIC COMMA
+	0x00ae: None,
+	0x00af: None,
+	0x00b0: None,
+	0x00b1: None,
+	0x00b2: None,
+	0x00b3: None,
+	0x00b4: None,
+	0x00b5: None,
+	0x00b6: None,
+	0x00b7: None,
+	0x00b8: None,
+	0x00b9: None,
+	0x00ba: None,
 	0x00bb: 0x061b,	# 	ARABIC SEMICOLON
+	0x00bc: None,
+	0x00bd: None,
+	0x00be: None,
 	0x00bf: 0x061f,	# 	ARABIC QUESTION MARK
+	0x00c0: None,
 	0x00c1: 0x0621,	# 	ARABIC LETTER HAMZA
 	0x00c2: 0x0622,	# 	ARABIC LETTER ALEF WITH MADDA ABOVE
 	0x00c3: 0x0623,	# 	ARABIC LETTER ALEF WITH HAMZA ABOVE
@@ -66,6 +93,11 @@
 	0x00d8: 0x0638,	# 	ARABIC LETTER ZAH
 	0x00d9: 0x0639,	# 	ARABIC LETTER AIN
 	0x00da: 0x063a,	# 	ARABIC LETTER GHAIN
+	0x00db: None,
+	0x00dc: None,
+	0x00dd: None,
+	0x00de: None,
+	0x00df: None,
 	0x00e0: 0x0640,	# 	ARABIC TATWEEL
 	0x00e1: 0x0641,	# 	ARABIC LETTER FEH
 	0x00e2: 0x0642,	# 	ARABIC LETTER QAF
@@ -85,7 +117,20 @@
 	0x00f0: 0x0650,	# 	ARABIC KASRA
 	0x00f1: 0x0651,	# 	ARABIC SHADDA
 	0x00f2: 0x0652,	# 	ARABIC SUKUN
-}
+	0x00f3: None,
+	0x00f4: None,
+	0x00f5: None,
+	0x00f6: None,
+	0x00f7: None,
+	0x00f8: None,
+	0x00f9: None,
+	0x00fa: None,
+	0x00fb: None,
+	0x00fc: None,
+	0x00fd: None,
+	0x00fe: None,
+	0x00ff: None,
+})
 
 ### Encoding Map