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6c2f570d79
Previously `\x80` was incorrectly mapped to `0`.
```ruby
"\x80\x80\x80\x80".unpack("m*")
# before => "\x00\x00\x00"
# after => ""
```
The reason is that the C string terminator is placed in `base64_dec_tab[128]` and the array length is obtained by `sizeof`.
Therefore, the length of `base64_dec_tab[]` is strictly specified and replaced with element-by-element initialization.
Also, similar changes are made to `base64chars[]`.