feat(base64-rs): add GNU-compatible base64 command for Windows

Windows has no base64 command; certutil is file-only, adds PEM markers
and cannot be piped. This is a real base64.exe matching GNU coreutils:
same flags (-d, -i, -w), stdin/stdout streaming, exit codes and error
messages, so existing muscle memory and scripts carry over.

Verified against coreutils 9.7 with a 153-case differential test. The
subtle behaviours are reproduced: bytes are emitted incrementally so a
stream that goes bad still writes its valid prefix, unpadded tails are
accepted only when canonically encoded, concatenated streams decode as
one, and -w0 suppresses the trailing newline.

Deliberate deviation: '\r' is skipped when decoding alongside '\n', as
CRLF base64 files are routine on Windows and GNU rejects them.

Zero dependencies, so the build works offline.

This commit is contained in:

LyAhn

2026-07-27 21:36:01 +01:00

parent 3ee7d7a3ac

commit 5e6b4428bb

6 changed files with 556 additions and 0 deletions

									
										base64-rs/Cargo.toml
									
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				[package]

				name = "base64"

				version = "1.0.0"

				edition = "2021"

				[dependencies]

				[[bin]]

				name = "base64"

				path = "src/main.rs"

				[profile.release]

				opt-level = 3

				lto = true

				strip = true

				panic = "abort"