<Swing Dev> RFR JDK-8244324: RTFEditorKit does not display some of Japanese characters correctly

[Prasanta Sadhukhan]

Hi All,

Please review a fix for an issue seen whereby RTFEditorKit used to read 
Japanese characters reads some garbage characters.

The default character set used for the RTF document is set to "ansi" in 
our RTFReader.java.
And share/classes/javax/swing/text/rtf/charsets/ansi.txt code table has 
undefined values , i.e., 91-98 and A0 are "0". According to 
javax/swing/text/rtf/RTFParser.java, If the ch is 0, handleText() is not 
called

As per http://www.biblioscape.com/rtf15_spec.htm#Heading8,

/RTF file includes the following Character set in its header : //
//<character set> //
// (\ansi | \mac | \pc | \pca)? \ansicpgN? //
//Where, //
//\ansicpgN This keyword represents the default ANSI code page used to 
perform the *Unicode to ANSI conversion* when writing RTF text. N 
represents the code page in decimal. This is typically set to the 
default ANSI code page of the run-time environment (for example, 
\ansicpg1252 for U.S. Windows). The reader can use the same ANSI code 
page to convert ANSI text back to Unicode. This keyword should be 
emitted in the RTF header section right after the \ansi, \mac, \pc or 
\pca keyword. /

Possible values include those in the following table.We can make use of 
ansicpgN (can switch ANSI text to Unicode), define it to refer to the 
latin1TranslationTable [RTFParser inherits it from AbstractFilter] which 
does not include undefined areas instead of ansi's translationTable 
which has undefined areas as seen above.

Bug: https://bugs.openjdk.java.net/browse/JDK-8244324

webrev: http://cr.openjdk.java.net/~psadhukhan/8244324/webrev.0/

Note: I am not able to create a testcase for this as it involves reading 
from rtf file which probably is copyrighted and inserting Japanese 
characters as a string (instead of rtf file) was not working.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mail.openjdk.java.net/pipermail/swing-dev/attachments/20200514/08281d71/attachment.htm>