Bug 28321 (PC) - Encoding.GetString does not decode the text from Shift_JIS encoding correctly
Summary: Encoding.GetString does not decode the text from Shift_JIS encoding correctly
Status: NEW
Alias: PC
Product: Class Libraries
Classification: Mono
Component: General (show other bugs)
Version: 3.12.0
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2015-03-23 05:14 UTC by Prashant Cholachagudda
Modified: 2017-11-22 08:20 UTC (History)
3 users (show)

See Also:
Is this bug a regression?: ---
Last known good build:


Description Prashant Cholachagudda 2015-03-23 05:14:15 UTC
When we try to get the string from Shift_JIS encoded text we get incorrect value from GetString method

	var sjisEnc = Encoding.GetEncoding("Shift_JIS");
	byte[] sjisText1 =  Encoding.GetEncoding("Shift_JIS").GetBytes("×");
	string text1 = sjisEnc.GetString(sjisText1);

The text value returned as `?` instead of `x`
Comment 1 Jodie Miu 2017-11-22 08:20:57 UTC
`x` is not what GetString should be returning. GetString should be returning `×` -- multiplication sign vs the letter `x`.

Note: all of these files are located in `mcs/class/I18N/CJK`.

I followed this bug all the way up to the GetChars method in CP932.cs, where I realized the lookup in the convert.jisx0208ToUnicode table returns a 0. It shouldn't be returning a 0. This table comes from the JISConvert class, which loads the jis.table in the same directory in. There is a comment from lines 36-42 in the CP51932.cs file, stating:

    "FIXME: Some characters such as 0xFF0B (wide "plus") are missing in that table".

I also looked at the table as it was printed from one of the tools in the tools subdirectory. Indeed, it was missing an entry for 0x817E.

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