unicode - PDF: Duplicate font names with different ToUnicode Cmaps -

-


unicode - PDF: Duplicate font names with different ToUnicode Cmaps -

i'm parsing pdf file , extracting of text, , i've run situation encounter font dictionary named "c2_0", contains cidfont (type 0) tounicode cmap. so, no problem - have tools parse tounicode cmap , map 2-byte character codes unicode values.

but pdf file later includes another font dictionary object, also called "c2_0", contains different tounicode cmap. didn't how should handle sec cmap, guessed , combined entries both cmaps. worked, , extracted text correctly.

but, can't find in pdf reference manual says allowed, or addresses situation. have thought duplicate font names lead unspecified behavior, or @ to the lowest degree have sec override first or something. tried combining them longshot guess - , surprised worked.

does have experience this? know if pdf allowed have duplicate font names refer different objects different cmaps "combine" when invoked tf operator?

c2_0 symbolic name in /font resource dictionary , has local scope, used in content stream resource dictionary belongs to. if c2_0 appears in /font resource dictionary, that's not problem. in have in same /font resource dictionary 2 c2_0 entries: /c2_0 x 0 r /c2_0 y 0 r have problem because behavior undefined , how handle situation. symbolic name resolution works this: if in page content stream, search font symbolic name (the tf operand) in page's resources dictionary. if cannot locate it, go in page tree , search resources dictionary (if exist) each parent page node. if reached top of page tree , did not find font, behavior undefined. @ moment can implement various fallback strategies: can utilize default font, can search resources included in form xobjects on page, can search resources dictionaries in other pages.

pdf unicode

Comments

Post a Comment

Popular posts from this blog

How do I check if an insert was successful with MySQLdb in Python? -

-
How do I check if an insert was successful with MySQLdb in Python? - i have code: cursor = conn.cursor() cursor.execute(("insert new_files (videos_id, filename, " "is_processing) values (%s,%s,1)"), (id, filename)) logging.warn("%d", cursor.rowcount) if (cursor.rowcount == 1): logging.info("inserted values %d, %s", id, filename) else: logging.warn("failed insert values %d, %s", id, filename) cursor.close() fun is, cursor.rowcount always one, though updated database create videos_id unique key. is, insert fails because in tests same videos_id going appear (and when check database, nil inserted). whatever reason, rowcount 1 - logging.warn have spits out rowcount of 1. so, question: can utilize rowcount work out if insert went fine? if so, (presumably) doing wrong? otherwise, how check if insert went fine? your code not commit after modifications (your modifications rolled back). should...
Read more

delphi - blogger via idHTTP : error 400 bad request -

-
delphi - blogger via idHTTP : error 400 bad request - i'm trying post blogger using idhttp component, however, i'm getting "http/1.0 400 bad request" error. procedure tform1.button1click(sender: tobject); var request,response,req : tstringlist; auth,blogid : string; begin blogid := '00000000000000000000000'; request := tstringlist.create; response := tstringlist.create; req := tstringlist.create; idhttp1.request.connection := 'keep-alive'; idhttp1.request.contenttype := 'application/x-www-form-urlencoded'; idssliohandlersocket1.ssloptions.method := sslvsslv23; request.clear(); request.values['accounttype'] := 'google'; request.values['email'] := 'xxx@gmail.com'; request.values['passwd'] := 'yyy'; request.values['service'] := 'blogger'; response.text :=idhttp1.post('https://www.google.com/accounts/clientlogin',request); auth := resp...
Read more

postgresql - ERROR: operator is not unique: unknown + unknown -

-
postgresql - ERROR: operator is not unique: unknown + unknown - i have postgis database , have compute new values rows in new column. these values should average of values of several columns. query: insert bdps (da_m) values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7')); in query bdps database, da_m new column , da_1 da_7 existing columns have double precision type. da_m created using alter table bdps add together column da_m double precision; i next error: error: operator not unique: unknown + unknown line 2: values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7... ^ hint: not take best candidate operator. might need add together explicit type casts. ********** error ********** error: operator not unique: unknown + unknown sql state: 42725 hint: not take best candidate operator. might need add togethe...
Read more