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serialize: Remove base64 support

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This is not used in-tree and is available out-of-tree
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Alex Crichton 2015-01-20 15:38:50 -08:00
parent 4be79d6acd
commit 494896f2dd
2 changed files with 0 additions and 425 deletions
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424
src/libserialize/base64.rs
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@ -1,424 +0,0 @@
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//
// ignore-lexer-test FIXME #15679
//! Base64 binary-to-text encoding
pub use self::FromBase64Error::*;
pub use self::CharacterSet::*;
use std::fmt;
use std::error;
/// Available encoding character sets
#[derive(Copy)]
pub enum CharacterSet {
/// The standard character set (uses `+` and `/`)
Standard,
/// The URL safe character set (uses `-` and `_`)
UrlSafe
}
/// Available newline types
#[derive(Copy)]
pub enum Newline {
/// A linefeed (i.e. Unix-style newline)
LF,
/// A carriage return and a linefeed (i.e. Windows-style newline)
CRLF
}
/// Contains configuration parameters for `to_base64`.
#[derive(Copy)]
pub struct Config {
/// Character set to use
pub char_set: CharacterSet,
/// Newline to use
pub newline: Newline,
/// True to pad output with `=` characters
pub pad: bool,
/// `Some(len)` to wrap lines at `len`, `None` to disable line wrapping
pub line_length: Option<uint>
}
/// Configuration for RFC 4648 standard base64 encoding
pub static STANDARD: Config =
Config {char_set: Standard, newline: Newline::CRLF, pad: true, line_length: None};
/// Configuration for RFC 4648 base64url encoding
pub static URL_SAFE: Config =
Config {char_set: UrlSafe, newline: Newline::CRLF, pad: false, line_length: None};
/// Configuration for RFC 2045 MIME base64 encoding
pub static MIME: Config =
Config {char_set: Standard, newline: Newline::CRLF, pad: true, line_length: Some(76)};
static STANDARD_CHARS: &'static[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
abcdefghijklmnopqrstuvwxyz\
0123456789+/";
static URLSAFE_CHARS: &'static[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
abcdefghijklmnopqrstuvwxyz\
0123456789-_";
/// A trait for converting a value to base64 encoding.
pub trait ToBase64 {
/// Converts the value of `self` to a base64 value following the specified
/// format configuration, returning the owned string.
fn to_base64(&self, config: Config) -> String;
}
impl ToBase64 for [u8] {
/// Turn a vector of `u8` bytes into a base64 string.
///
/// # Example
///
/// ```rust
/// extern crate serialize;
/// use serialize::base64::{ToBase64, STANDARD};
///
/// fn main () {
/// let str = [52,32].to_base64(STANDARD);
/// println!("base 64 output: {}", str);
/// }
/// ```
fn to_base64(&self, config: Config) -> String {
let bytes = match config.char_set {
Standard => STANDARD_CHARS,
UrlSafe => URLSAFE_CHARS
};
// In general, this Vec only needs (4/3) * self.len() memory, but
// addition is faster than multiplication and division.
let mut v = Vec::with_capacity(self.len() + self.len());
let mut i = 0;
let mut cur_length = 0;
let len = self.len();
let mod_len = len % 3;
let cond_len = len - mod_len;
let newline = match config.newline {
Newline::LF => b"\n",
Newline::CRLF => b"\r\n"
};
while i < cond_len {
let (first, second, third) = (self[i], self[i + 1], self[i + 2]);
if let Some(line_length) = config.line_length {
if cur_length >= line_length {
v.push_all(newline);
cur_length = 0;
}
}
let n = (first as u32) << 16 |
(second as u32) << 8 |
(third as u32);
// This 24-bit number gets separated into four 6-bit numbers.
v.push(bytes[((n >> 18) & 63) as uint]);
v.push(bytes[((n >> 12) & 63) as uint]);
v.push(bytes[((n >> 6 ) & 63) as uint]);
v.push(bytes[(n & 63) as uint]);
cur_length += 4;
i += 3;
}
if mod_len != 0 {
if let Some(line_length) = config.line_length {
if cur_length >= line_length {
v.push_all(newline);
}
}
}
// Heh, would be cool if we knew this was exhaustive
// (the dream of bounded integer types)
match mod_len {
0 => (),
1 => {
let n = (self[i] as u32) << 16;
v.push(bytes[((n >> 18) & 63) as uint]);
v.push(bytes[((n >> 12) & 63) as uint]);
if config.pad {
v.push(b'=');
v.push(b'=');
}
}
2 => {
let n = (self[i] as u32) << 16 |
(self[i + 1u] as u32) << 8;
v.push(bytes[((n >> 18) & 63) as uint]);
v.push(bytes[((n >> 12) & 63) as uint]);
v.push(bytes[((n >> 6 ) & 63) as uint]);
if config.pad {
v.push(b'=');
}
}
_ => panic!("Algebra is broken, please alert the math police")
}
unsafe { String::from_utf8_unchecked(v) }
}
}
/// A trait for converting from base64 encoded values.
pub trait FromBase64 {
/// Converts the value of `self`, interpreted as base64 encoded data, into
/// an owned vector of bytes, returning the vector.
fn from_base64(&self) -> Result<Vec<u8>, FromBase64Error>;
}
/// Errors that can occur when decoding a base64 encoded string
#[derive(Copy, Show)]
pub enum FromBase64Error {
/// The input contained a character not part of the base64 format
InvalidBase64Byte(u8, uint),
/// The input had an invalid length
InvalidBase64Length,
}
impl fmt::Display for FromBase64Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
InvalidBase64Byte(ch, idx) =>
write!(f, "Invalid character '{}' at position {}", ch, idx),
InvalidBase64Length => write!(f, "Invalid length"),
}
}
}
impl error::Error for FromBase64Error {
fn description(&self) -> &str {
match *self {
InvalidBase64Byte(_, _) => "invalid character",
InvalidBase64Length => "invalid length",
}
}
}
impl FromBase64 for str {
/// Convert any base64 encoded string (literal, `@`, `&`, or `~`)
/// to the byte values it encodes.
///
/// You can use the `String::from_utf8` function to turn a `Vec<u8>` into a
/// string with characters corresponding to those values.
///
/// # Example
///
/// This converts a string literal to base64 and back.
///
/// ```rust
/// extern crate serialize;
/// use serialize::base64::{ToBase64, FromBase64, STANDARD};
///
/// fn main () {
/// let hello_str = b"Hello, World".to_base64(STANDARD);
/// println!("base64 output: {}", hello_str);
/// let res = hello_str.as_slice().from_base64();
/// if res.is_ok() {
/// let opt_bytes = String::from_utf8(res.unwrap());
/// if opt_bytes.is_ok() {
/// println!("decoded from base64: {}", opt_bytes.unwrap());
/// }
/// }
/// }
/// ```
#[inline]
fn from_base64(&self) -> Result<Vec<u8>, FromBase64Error> {
self.as_bytes().from_base64()
}
}
impl FromBase64 for [u8] {
fn from_base64(&self) -> Result<Vec<u8>, FromBase64Error> {
let mut r = Vec::with_capacity(self.len());
let mut buf: u32 = 0;
let mut modulus = 0i;
let mut it = self.iter().enumerate();
for (idx, &byte) in it {
let val = byte as u32;
match byte {
b'A'...b'Z' => buf |= val - 0x41,
b'a'...b'z' => buf |= val - 0x47,
b'0'...b'9' => buf |= val + 0x04,
b'+' | b'-' => buf |= 0x3E,
b'/' | b'_' => buf |= 0x3F,
b'\r' | b'\n' => continue,
b'=' => break,
_ => return Err(InvalidBase64Byte(self[idx], idx)),
}
buf <<= 6;
modulus += 1;
if modulus == 4 {
modulus = 0;
r.push((buf >> 22) as u8);
r.push((buf >> 14) as u8);
r.push((buf >> 6 ) as u8);
}
}
for (idx, &byte) in it {
match byte {
b'=' | b'\r' | b'\n' => continue,
_ => return Err(InvalidBase64Byte(self[idx], idx)),
}
}
match modulus {
2 => {
r.push((buf >> 10) as u8);
}
3 => {
r.push((buf >> 16) as u8);
r.push((buf >> 8 ) as u8);
}
0 => (),
_ => return Err(InvalidBase64Length),
}
Ok(r)
}
}
#[cfg(test)]
mod tests {
extern crate test;
use self::test::Bencher;
use base64::{Config, Newline, FromBase64, ToBase64, STANDARD, URL_SAFE};
#[test]
fn test_to_base64_basic() {
assert_eq!("".as_bytes().to_base64(STANDARD), "");
assert_eq!("f".as_bytes().to_base64(STANDARD), "Zg==");
assert_eq!("fo".as_bytes().to_base64(STANDARD), "Zm8=");
assert_eq!("foo".as_bytes().to_base64(STANDARD), "Zm9v");
assert_eq!("foob".as_bytes().to_base64(STANDARD), "Zm9vYg==");
assert_eq!("fooba".as_bytes().to_base64(STANDARD), "Zm9vYmE=");
assert_eq!("foobar".as_bytes().to_base64(STANDARD), "Zm9vYmFy");
}
#[test]
fn test_to_base64_crlf_line_break() {
assert!(![0u8; 1000].to_base64(Config {line_length: None, ..STANDARD})
.contains("\r\n"));
assert_eq!(b"foobar".to_base64(Config {line_length: Some(4),
..STANDARD}),
"Zm9v\r\nYmFy");
}
#[test]
fn test_to_base64_lf_line_break() {
assert!(![0u8; 1000].to_base64(Config {line_length: None,
newline: Newline::LF,
..STANDARD})
.as_slice()
.contains("\n"));
assert_eq!(b"foobar".to_base64(Config {line_length: Some(4),
newline: Newline::LF,
..STANDARD}),
"Zm9v\nYmFy");
}
#[test]
fn test_to_base64_padding() {
assert_eq!("f".as_bytes().to_base64(Config {pad: false, ..STANDARD}), "Zg");
assert_eq!("fo".as_bytes().to_base64(Config {pad: false, ..STANDARD}), "Zm8");
}
#[test]
fn test_to_base64_url_safe() {
assert_eq!([251, 255].to_base64(URL_SAFE), "-_8");
assert_eq!([251, 255].to_base64(STANDARD), "+/8=");
}
#[test]
fn test_from_base64_basic() {
assert_eq!("".from_base64().unwrap(), b"");
assert_eq!("Zg==".from_base64().unwrap(), b"f");
assert_eq!("Zm8=".from_base64().unwrap(), b"fo");
assert_eq!("Zm9v".from_base64().unwrap(), b"foo");
assert_eq!("Zm9vYg==".from_base64().unwrap(), b"foob");
assert_eq!("Zm9vYmE=".from_base64().unwrap(), b"fooba");
assert_eq!("Zm9vYmFy".from_base64().unwrap(), b"foobar");
}
#[test]
fn test_from_base64_bytes() {
assert_eq!(b"Zm9vYmFy".from_base64().unwrap(), b"foobar");
}
#[test]
fn test_from_base64_newlines() {
assert_eq!("Zm9v\r\nYmFy".from_base64().unwrap(),
b"foobar");
assert_eq!("Zm9vYg==\r\n".from_base64().unwrap(),
b"foob");
assert_eq!("Zm9v\nYmFy".from_base64().unwrap(),
b"foobar");
assert_eq!("Zm9vYg==\n".from_base64().unwrap(),
b"foob");
}
#[test]
fn test_from_base64_urlsafe() {
assert_eq!("-_8".from_base64().unwrap(), "+/8=".from_base64().unwrap());
}
#[test]
fn test_from_base64_invalid_char() {
assert!("Zm$=".from_base64().is_err());
assert!("Zg==$".from_base64().is_err());
}
#[test]
fn test_from_base64_invalid_padding() {
assert!("Z===".from_base64().is_err());
}
#[test]
fn test_base64_random() {
use std::rand::{thread_rng, random, Rng};
for _ in range(0u, 1000) {
let times = thread_rng().gen_range(1u, 100);
let v = thread_rng().gen_iter::<u8>().take(times).collect::<Vec<_>>();
assert_eq!(v.to_base64(STANDARD)
.from_base64()
.unwrap(),
v);
}
}
#[bench]
pub fn bench_to_base64(b: &mut Bencher) {
let s = "イロハニホヘト チリヌルヲ ワカヨタレソ ツネナラム \
ウヰノオクヤマ ケフコエテ アサキユメミシ ヱヒモセスン";
b.iter(|| {
s.as_bytes().to_base64(STANDARD);
});
b.bytes = s.len() as u64;
}
#[bench]
pub fn bench_from_base64(b: &mut Bencher) {
let s = "イロハニホヘト チリヌルヲ ワカヨタレソ ツネナラム \
ウヰノオクヤマ ケフコエテ アサキユメミシ ヱヒモセスン";
let sb = s.as_bytes().to_base64(STANDARD);
b.iter(|| {
sb.from_base64().unwrap();
});
b.bytes = sb.len() as u64;
}
}

1
src/libserialize/lib.rs
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@ -43,7 +43,6 @@ pub use self::serialize::{Decoder, Encoder, Decodable, Encodable,
mod serialize;
mod collection_impls;
pub mod base64;
pub mod hex;
pub mod json;