Review Request 128295: fix base64 decoding on ARM

[Rolf Eike Beer]

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https://git.reviewboard.kde.org/r/128295/
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Review request for KDE Frameworks.


Bugs: 364495
    http://bugs.kde.org/show_bug.cgi?id=364495


Repository: qca


Description
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This code was broken on ARM and other architectures where "char" is unsigned by default.

First, it breaks with newer compilers with errors like:

  .../src/qca_textfilter.cpp:314:2: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]

Second, if the compiler would just allow this conversion then the unsigned char would hold 255, which would not be sign extended when cast to an int later, so all the checks "< 0" will never trigger, and so invalid input characters cannot be detected.


Diffs
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  src/qca_textfilter.cpp 9889a24 

Diff: https://git.reviewboard.kde.org/r/128295/diff/


Testing
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Builds without error on newer gcc now.


Thanks,

Rolf Eike Beer

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