Function base64DecodeToUtf8Arr

Converts a Base64 string into a UTF-8 array.

If your aim is to build a buffer of 16-bit / 32-bit / 64-bit raw data, use the blocksSize argument, which is the number of bytes of which the uint8Array.buffer.bytesLength property must result a multiple.

• 1 or omitted for ASCII, binary strings (i.e., a string in which each character in the string is treated as a byte of binary data) or UTF-8-encoded strings,
• 2 for UTF-16 strings,
• 4 for UTF-32 strings