82 lines
2.3 KiB
Rust
82 lines
2.3 KiB
Rust
use std::fs::File;
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use std::io::{self, Read};
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use std::path::PathBuf;
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use std::process;
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use base64::{alphabet, engine, read, write};
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use clap::Parser;
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#[derive(Clone, Debug, Parser, strum::EnumString, Default)]
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#[strum(serialize_all = "kebab-case")]
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enum Alphabet {
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#[default]
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Standard,
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UrlSafe,
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}
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/// Base64 encode or decode FILE (or standard input), to standard output.
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#[derive(Debug, Parser)]
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struct Opt {
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/// Decode the base64-encoded input (default: encode the input as base64).
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#[structopt(short = 'd', long = "decode")]
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decode: bool,
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/// The encoding alphabet: "standard" (default) or "url-safe".
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#[structopt(long = "alphabet")]
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alphabet: Option<Alphabet>,
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/// Omit padding characters while encoding, and reject them while decoding.
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#[structopt(short = 'p', long = "no-padding")]
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no_padding: bool,
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/// The file to encode or decode.
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#[structopt(name = "FILE", parse(from_os_str))]
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file: Option<PathBuf>,
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}
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fn main() {
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let opt = Opt::parse();
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let stdin;
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let mut input: Box<dyn Read> = match opt.file {
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None => {
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stdin = io::stdin();
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Box::new(stdin.lock())
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}
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Some(ref f) if f.as_os_str() == "-" => {
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stdin = io::stdin();
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Box::new(stdin.lock())
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}
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Some(f) => Box::new(File::open(f).unwrap()),
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};
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let alphabet = opt.alphabet.unwrap_or_default();
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let engine = engine::GeneralPurpose::new(
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&match alphabet {
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Alphabet::Standard => alphabet::STANDARD,
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Alphabet::UrlSafe => alphabet::URL_SAFE,
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},
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match opt.no_padding {
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true => engine::general_purpose::NO_PAD,
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false => engine::general_purpose::PAD,
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},
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);
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let stdout = io::stdout();
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let mut stdout = stdout.lock();
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let r = if opt.decode {
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let mut decoder = read::DecoderReader::new(&mut input, &engine);
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io::copy(&mut decoder, &mut stdout)
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} else {
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let mut encoder = write::EncoderWriter::new(&mut stdout, &engine);
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io::copy(&mut input, &mut encoder)
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};
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if let Err(e) = r {
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eprintln!(
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"Base64 {} failed with {}",
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if opt.decode { "decode" } else { "encode" },
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e
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);
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process::exit(1);
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}
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}
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