[poppler] Improvement of "Missing language pack" message?

[suzuki toshiya]

Hi all,

When poppler could not load the required mapping table resources,
is it an improvement to make the message telling the directory to
store the mapping files?

Recently, I saw a post from pdftotext user who was wondering
what should be done when pdftotext says "Missing language pack".

It is easy to tell "install poppler-data", but it is not so easy
to detect which directory to install it. Especially, when the user
is using a prebuilt binary without configuration information,
some try-and-error tests would be required. The vanilla installation
of poppler does not make the directory ${prefix}/share/poppler,
so there is no reliable mark.

I will try to make a patch to make "Missing language pack" more
verbose, with the pathname to install mapping files (some catch-ball
is required between GlobalParams and GfxFont class, because this
message is issued when no mapping table is found in cache). If it
is a bad idea, and won't be acceptable, please let me know.

Regards,
mpsuzuki

suzuki toshiya wrote:
> Hi,
> 
> Have you installed poppler-data which is a package collecting
> the resource files converting embedded fonts to coded texts?
> 
> Regards,
> mpsuzuki
> 
> 杨辉强 wrote:
>> Hi, all:
>> As is known to everyone, some pdf files are generated from images, 
>> i.e, the pdf file text can't be selected and copied, it just contains 
>> some images. When pdftotext process this type pdf file, it reports 
>> following errors:
>>
>> Error: Missing language pack for 'Adobe-GB1' mapping
>> Error: Missing language pack for 'Adobe-GB1' mapping
>> Error: Unknown font tag 'F0'
>> Error (675): No font in show
>> Error (683): No font in show
>> Error (688): No font in show
>> Error (693): No font in show
>> Error (705): No font in show
>>
>>   I wish you can give me some advices.
>>
>> Thank you!
>> Best wishes!