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base64: RFC 4648 base64 encoding support
A stream-based encoding and decoding interface is available via [[newencoder]]
and [[newdecoder]], which transparently encode or decode bytes to or from base64
when writing to or reading from an underlying I/O handle.
Convenience functions for encoding to or decoding from a byte slice or a string
are also available; see [[encodeslice]], [[decodeslice]], [[encodestr]], and
[[decodestr]]. These functions dynamically allocate their return values; use the
stream interface if you require static allocation.
Each function accepts the desired base64 encoding alphabet as its first
argument. [[std_encoding]] and [[url_encoding]], as defined by the RFC, are
provided for your convenience, but you may create your own encoding using
[[encoding_init]].
Due to security concerns described by the RFC, this implementation rejects
invalid padding.
https://datatracker.ietf.org/doc/html/rfc4648#section-12
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