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Posted to j-dev@xerces.apache.org by bu...@apache.org on 2002/01/29 02:00:21 UTC
DO NOT REPLY [Bug 6082] New: - Many encodings are broken in Xerces

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6082

Many encodings are broken in Xerces

           Summary: Many encodings are broken in Xerces
           Product: Xerces-J
           Version: 1.4.4
          Platform: All
        OS/Version: Other
            Status: NEW
          Severity: Critical
          Priority: Other
         Component: Serialization
        AssignedTo: xerces-j-dev@xml.apache.org
        ReportedBy: paul@prescod.net


The ISO-8859-n (n>1) encodings are broken because the "lastPrintable" character 
is set to 0xFF, when it should be set to 0x7F (see Encodings.java, line 110-
118). 

The Windows-31J encoding is broken because the Java encoder is broken. It 
cannot correctly round-trip several characters. The characters that it cannot 
round-trip are:

0xa2
0xa3
0xa5
0xab
0xac
0xaf
0xb5
0xb7
0xb8
0xbb
0x203e
0x3094

The reason is because the same encoded byte patterns are used by different code 
points:

The byte pattern (92,) is used by: 5c, a5
The byte pattern (126,) is used by: 7e, 203e
The byte pattern (-127, -111) is used by: a2, ffe0
The byte pattern (-127, -110) is used by: a3, ffe1
The byte pattern (-127, -31) is used by: ab, 226a
The byte pattern (-127, -54) is used by: ac, ffe2
The byte pattern (-127, 80) is used by: af, ffe3
The byte pattern (-125, -54) is used by: b5, 3bc
The byte pattern (-127, 69) is used by: b7, 30fb
The byte pattern (-127, 67) is used by: b8, ff0c
The byte pattern (-127, -30) is used by: bb, 226b
The byte pattern (-125, -108) is used by: 3094, 30f4

You can fix this by adding these characters to the "JIS_DANGER_CHARS" 
(Encodings.java, line 99) or by creating a new list of danager characters just 
for Windows-31J.

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