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Thomas Neumann 15085a9f95 avoid memory allocation in base64decode
Every single call to base64decode allocates a mapping table for all
base64 characters. This is quite wasteful, as the map is in fact static.
We could use a static variable here, but that would have unpleasant consequences
if we ever encounter input with non-valid base64 characters (which
implicitly modifies the map).

The number of character ranges for base64 is quite low (3, plus 4 exceptions),
thus we can simply check that explicitly in code instead of using a dynamic hash table.
2022-01-24 07:24:34 +01:00
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