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When the hexadecimal string has an odd length, the resulting binary data must be left padded with 0s in order to be aligned on 8 bits. To avoid extraneous if test on each iteration, we distinguish the special case by pointing the source data iterator the the NUL bytes at the end which we can then detect and act accordingly.
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I changed the comment style and reverted the encoding problems. BTW the encoding problem was coming from the github inline editor since I did my first patch through the web interface. |
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I'll redo the pull request cleanly. |
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This is a patch for : https://bugs.php.net/bug.php?id=61660
I'm the one who reported the bug and I tested the patch in the particular case which led to his discovery.
Their can still be a problem with
bin2hex. The reverse function is not aware of left padded values and thus return '01234' for example which can lead to some problems like stated by laruence in the bug comments.I think
bin2hexshould also be patched to remove any leading 0s in the binary representation before converting it, but this is out of the scope of my patch and needs discussion.