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Chris Tate
975270cef5
Buffer.from(text, "base64" | "base64url") decoded each four-character group with four lookups and a sign test, then stored its three bytes one at a time. The decoder now first takes complete groups two at a time: each character's value comes from a table that holds it already shifted into place within its group's 24 bits, a single bit test covers all eight characters, and each group's three bytes go out in one four-byte store whose last byte the next store overwrites. A group with any other character (padding, whitespace, an invalid character) takes the previous path, and the two-group step resumes after it, so line-wrapped text keeps most of the gain. The destination already holds two spare bytes, which cover the extra store byte.