diff -r 044dc196ec8a -r d3668ecd9137 src/ztfy/utils/encoding.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ztfy/utils/encoding.py	Wed Jun 20 16:29:53 2012 +0200
@@ -0,0 +1,159 @@
+### -*- coding: utf-8 -*- ####################################################
+##############################################################################
+#
+# Copyright (c) 2008-2012 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+__docformat__ = "restructuredtext"
+
+# import standard packages
+
+# import Zope3 interfaces
+from zope.schema.interfaces import IVocabularyFactory, IChoice
+
+# import local interfaces
+
+# import Zope3 packages
+from zope.i18n import translate
+from zope.interface import classProvides, implements
+from zope.schema import Choice
+from zope.schema.vocabulary import SimpleTerm, SimpleVocabulary
+
+# import local packages
+from ztfy.utils.request import queryRequest
+
+from ztfy.utils import _
+
+
+ENCODINGS = {
+              'ascii': _('English (ASCII)'),
+              'big5': _('Traditional Chinese (big5)'),
+              'big5hkscs': _('Traditional Chinese (big5hkscs)'),
+              'cp037': _('English (cp037)'),
+              'cp424': _('Hebrew (cp424)'),
+              'cp437': _('English (cp437)'),
+              'cp500': _('Western Europe (cp500)'),
+              'cp720': _('Arabic (cp720)'),
+              'cp737': _('Greek (cp737)'),
+              'cp775': _('Baltic languages (cp775)'),
+              'cp850': _('Western Europe (cp850)'),
+              'cp852': _('Central and Eastern Europe (cp852)'),
+              'cp855': _('Bulgarian, Byelorussian, Macedonian, Russian, Serbian (cp855)'),
+              'cp856': _('Hebrew (cp856)'),
+              'cp857': _('Turkish (cp857)'),
+              'cp858': _('Western Europe (cp858)'),
+              'cp860': _('Portuguese (cp860)'),
+              'cp861': _('Icelandic (cp861)'),
+              'cp862': _('Hebrew (cp862)'),
+              'cp863': _('Canadian (cp863)'),
+              'cp864': _('Arabic (cp864)'),
+              'cp865': _('Danish, Norwegian (cp865)'),
+              'cp866': _('Russian (cp866)'),
+              'cp869': _('Greek (cp869)'),
+              'cp874': _('Thai (cp874)'),
+              'cp875': _('Greek (cp875)'),
+              'cp932': _('Japanese (cp932)'),
+              'cp949': _('Korean (cp949)'),
+              'cp950': _('Traditional Chinese (cp950)'),
+              'cp1006': _('Urdu (cp1006)'),
+              'cp1026': _('Turkish (cp1026)'),
+              'cp1140': _('Western Europe (cp1140)'),
+              'cp1250': _('Central and Eastern Europe (cp1250)'),
+              'cp1251': _('Bulgarian, Byelorussian, Macedonian, Russian, Serbian (cp1251)'),
+              'cp1252': _('Western Europe (cp1252)'),
+              'cp1253': _('Greek (cp1253)'),
+              'cp1254': _('Turkish (cp1254)'),
+              'cp1255': _('Hebrew (cp1255)'),
+              'cp1256': _('Arabic (cp1256)'),
+              'cp1257': _('Baltic languages (cp1257)'),
+              'cp1258': _('Vietnamese (cp1258)'),
+              'euc_jp': _('Japanese (euc_jp)'),
+              'euc_jis_2004': _('Japanese (euc_jis_2004)'),
+              'euc_jisx0213': _('Japanese (euc_jisx0213)'),
+              'euc_kr': _('Korean (euc_kr)'),
+              'gb2312': _('Simplified Chinese (gb2312)'),
+              'gbk': _('Unified Chinese (gbk)'),
+              'gb18030': _('Unified Chinese (gb18030)'),
+              'hz': _('Simplified Chinese (hz)'),
+              'iso2022_jp': _('Japanese (iso2022_jp)'),
+              'iso2022_jp_1': _('Japanese (iso2022_jp_1)'),
+              'iso2022_jp_2': _('Japanese, Korean, Simplified Chinese, Western Europe, Greek (iso2022_jp_2)'),
+              'iso2022_jp_2004': _('Japanese (iso2022_jp_2004)'),
+              'iso2022_jp_3': _('Japanese (iso2022_jp_3)'),
+              'iso2022_jp_ext': _('Japanese (iso2022_jp_ext)'),
+              'iso2022_kr': _('Korean (iso2022_kr)'),
+              'latin_1': _('West Europe (latin_1)'),
+              'iso8859_2': _('Central and Eastern Europe (iso8859_2)'),
+              'iso8859_3': _('Esperanto, Maltese (iso8859_3)'),
+              'iso8859_4': _('Baltic languages (iso8859_4)'),
+              'iso8859_5': _('Bulgarian, Byelorussian, Macedonian, Russian, Serbian (iso8859_5)'),
+              'iso8859_6': _('Arabic (iso8859_6)'),
+              'iso8859_7': _('Greek (iso8859_7)'),
+              'iso8859_8': _('Hebrew (iso8859_8)'),
+              'iso8859_9': _('Turkish (iso8859_9)'),
+              'iso8859_10': _('Nordic languages (iso8859_10)'),
+              'iso8859_13': _('Baltic languages (iso8859_13)'),
+              'iso8859_14': _('Celtic languages (iso8859_14)'),
+              'iso8859_15': _('Western Europe (iso8859_15)'),
+              'iso8859_16': _('South-Eastern Europe (iso8859_16)'),
+              'johab': _('Korean (johab)'),
+              'koi8_r': _('Russian (koi8_r)'),
+              'koi8_u': _('Ukrainian (koi8_u)'),
+              'mac_cyrillic': _('Bulgarian, Byelorussian, Macedonian, Russian, Serbian (mac_cyrillic)'),
+              'mac_greek': _('Greek (mac_greek)'),
+              'mac_iceland': _('Icelandic (mac_iceland)'),
+              'mac_latin2': _('Central and Eastern Europe (mac_latin2)'),
+              'mac_roman': _('Western Europe (mac_roman)'),
+              'mac_turkish': _('Turkish (mac_turkish)'),
+              'ptcp154': _('Kazakh (ptcp154)'),
+              'shift_jis': _('Japanese (shift_jis)'),
+              'shift_jis_2004': _('Japanese (shift_jis_2004)'),
+              'shift_jisx0213': _('Japanese (shift_jisx0213)'),
+              'utf_32': _('all languages (utf_32)'),
+              'utf_32_be': _('all languages (utf_32_be)'),
+              'utf_32_le': _('all languages (utf_32_le)'),
+              'utf_16': _('all languages (utf_16)'),
+              'utf_16_be': _('all languages (BMP only - utf_16_be)'),
+              'utf_16_le': _('all languages (BMP only - utf_16_le)'),
+              'utf_7': _('all languages (utf_7)'),
+              'utf_8': _('all languages (utf_8)'),
+              'utf_8_sig': _('all languages (utf_8_sig)'),
+             }
+
+
+class EncodingsVocabulary(SimpleVocabulary):
+
+    classProvides(IVocabularyFactory)
+
+    def __init__(self, terms, *interfaces):
+        request = queryRequest()
+        terms = [SimpleTerm(unicode(v), title=translate(t, context=request)) for v, t in ENCODINGS.iteritems()]
+        terms.sort(key=lambda x: x.title)
+        super(EncodingsVocabulary, self).__init__(terms, *interfaces)
+
+
+class IEncodingField(IChoice):
+    """Encoding field interface"""
+
+
+class EncodingField(Choice):
+    """Encoding field"""
+
+    implements(IEncodingField)
+
+    def __init__(self, values=None, vocabulary='ZTFY encodings', source=None, **kw):
+        if 'values' in kw:
+            del kw['values']
+        if 'source' in kw:
+            del kw['source']
+        kw['vocabulary'] = vocabulary
+        super(EncodingField, self).__init__(**kw)