Failing to detect ISO-8859 encodings

[donlencho]

I have good results detecting Unicode encodings and Asian codepages, but really poor results with common European languages files saved in the ISO-8859 family, which are really common and this problem makes compact_enc_det unusable for me.
Encoding is always detected as ASCII (and reliable is set to true) for these encodings.
ISO-8859-6 for Arabic is OK.
Am I the only one?
Thanks for letting me know, so I can check if there is a problem or just look for an alternative.

[ghost]

Same problem here.

[JinsukKim]

Unfortunately I don't have plans to improve the detection quality. Could you share the data you get poor results with? I can take a look. Hopefully there will be some things to do to get around the issue.

Thanks.

[ghost]

See the attached file, which is encoded in Windows-1252 but detected as GB18030. Thanks for helping!

ansi.txt

[donlencho]

I'm joining test files and the results I get, as you can see I'm satisfied with the unicode detections (and mostly for asian encodings) but really disappointed by ISO, particularly for western European languages (ISO-1 and 15 for instance, which are really widespread, see:
https://www.terena.org/activities/multiling/ml-docs/iso-8859.html ).
Thank you in any case!

big5-hkscs.txt		→	BIG5_HKSCS, reliable: false		→ OK
big5.txt		→	BIG5, reliable: false			→ OK
BIG5.txt		→	BIG5, reliable: true			→ OK
euc-jp.txt		→	GB (=GBA8030?), reliable: false		→ ~OK
euc-kr.txt		→	KSC (=?), reliable: false		→ OK
gbk.txt			→	GB (=GBA8030?), reliable: false		→ OK
IBM855.txt		→	CP-1256, reliable: false		→ Not OK
ISO-8859-15-CRLF.srt	→	ASCII, reliable: true			→ Not OK
ISO-8859-15 euro.txt	→	ASCII, reliable: true			→ Not OK
ISO-8859-15 petit test.txt	→	CP1250, reliable: true		→ Not OK
ISO-8859-15.srt		→	ASCII, reliable: true			→ Not OK
ISO-8859-1.srt		→	ASCII, reliable: true			→ Not OK
ISO-8859-6.srt		→	Arabic, reliable: true			→ OK
shift_jis.txt		→	SJC, reliable: true			→ OK
UTF16BE.srt		→	UTF16BE, reliable: false		→ OK
UTF16LE.srt		→	UTF16LE, reliable: false		→ OK
UTF-7.txt		→	ASCII-7 bits, reliable: true		→ OK
UTF8BOM.srt		→	UTF8, reliable: true			→ OK
utf-8 CN.txt		→	UTF8, reliable: true			→ OK
UTF8CRLF.srt		→	UTF8, reliable: true			→ OK
UTF8CR.srt		→	UTF8, reliable: true			→ OK
UTF8LF.srt		→	UTF8, reliable: true			→ OK

encodings.tar.gz

[Lord-Kamina]

Just on the off-chance... do you have any idea on how this might be tackled; in case somebody else wants to take a crack at it?