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https://issues.apache.org/jira/browse/TIKA-1437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shuai Liu updated TIKA-1437:
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Attachment: ef.jpg
e9.jpg
the e9.jpg is a screenshot of the raw tsv file; you can see the hex code E9 is
presented as a char between M and xico, I believe it is a ‘e’ but in different
encoding/language.
So when we decode the char of E9 and when we output the stream decoded by
AutoDetectReader, we are seeing EF being decoded both in debug model and the
actual output file (i just would like to show you the difference), and note
there are some chars being garbled.
I have attached the problem input tsv file, please run a test with the attached
Java program and the problem file, the print out output from the program with
the problem input file on my console is as follows
...\hw1\data\computrabajo-ar-20121108.tsv
AutoDetectReader (calling UniversalEncodingDetector): UTF-8
UniversalEncodingDetector: UTF-8
CharsetDetector: ISO-8859-1
> encoding issue in AutoDetectReader
> ----------------------------------
>
> Key: TIKA-1437
> URL: https://issues.apache.org/jira/browse/TIKA-1437
> Project: Tika
> Issue Type: Bug
> Components: detector, parser
> Affects Versions: 1.6
> Environment: Windows 8
> Reporter: Shuai Liu
> Priority: Critical
> Attachments: EncodingProblem.java, computrabajo-ar-20121108.tsv,
> e9.jpg, ef.jpg
>
>
> We are having an encoding problem with Tika AutoDetectReader;
> we are using AutoDetectReader to read an stream to extract the string values
> by calling readLine()::AutoDetectReader. We find that the Encoding problem is
> happening in UniversalEncodingDetector being called by AutoDetectReader when
> reading the input stream being passed as one of the arguments in our
> TSVParser’s parse method.
> We are using AutoDetectReader in our parser and we believed it was able auto
> detect an correct encoding from the input stream being passed to it, but we
> are seeing several garbled chars bubbling up in our outputted and converted
> files from our parser; we find out that the encoding problem is happening in
> the UniversalEncodingDetector, which returns an UTF-8 and AutoDetectReader is
> reading the stream with UTF-8 which is incorrect encoding; and the correct
> encoding is ISO-8859-1.
> I am attaching the screenshot of what char difference we are seeing in the
> input tsv file and converted/outputed file. they are e9.jpg and ef.jpg,
> please read the description for details.
> The problem is that the AutoDetectReader is decoding and reading the chars
> with incorrect encoding.
> BTW, We were able to work around this problem with CharsetDetector, which
> seems to generate a valid encoding for the moment with which we can use to
> read the tsv file properly.
> However, the problem is we cannot use AutoDetectReader, we have to create our
> own TSVAutoDetectReader incorporated with CharsetDetector in the detect
> method; AutoDetectReader class seems to be less flexible for us to extend its
> functions, many of its methods are restricted with private constraints, we
> cannot manually set encoding or override the existing implementation for
> detecting encoding.
> In addition, I am also not confident about CharsetDetector either; as I am
> seeing different encodings produced by CharsetDetector and AutoDetectReader
> for different tsv files; But for now, we might live with CharsetDetector, as
> CharsetDetector is solving the current encoding problem.
> Finally, I would like to also please give you my test program (PFA:
> EncodingProblem.java) that reads an inputted tsv directory and displays a
> list of encodings for each of the tsv files in the directory produced by
> AutoDetectReader, UniversalEncodingDetector(which is being called by
> AutoDetectReader) and CharsetDetector; so you could probably see the
> difference, they are producing different encodings for some tsv files.
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