e617651384
Encoding should really only be done from [u8]<->str. The extra convenience implementations don't really have a place, especially since they're so trivial. Also improved error messages in FromBase64.
349 lines
11 KiB
Rust
349 lines
11 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Base64 binary-to-text encoding
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use std::str;
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/// Available encoding character sets
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pub enum CharacterSet {
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/// The standard character set (uses '+' and '/')
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Standard,
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/// The URL safe character set (uses '-' and '_')
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UrlSafe
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}
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/// Contains configuration parameters for to_base64
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pub struct Config {
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/// Character set to use
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char_set: CharacterSet,
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/// True to pad output with '=' characters
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pad: bool,
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/// Some(len) to wrap lines at len, None to disable line wrapping
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line_length: Option<uint>
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}
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/// Configuration for RFC 4648 standard base64 encoding
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pub static STANDARD: Config =
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Config {char_set: Standard, pad: true, line_length: None};
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/// Configuration for RFC 4648 base64url encoding
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pub static URL_SAFE: Config =
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Config {char_set: UrlSafe, pad: false, line_length: None};
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/// Configuration for RFC 2045 MIME base64 encoding
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pub static MIME: Config =
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Config {char_set: Standard, pad: true, line_length: Some(76)};
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static STANDARD_CHARS: &'static[u8] = bytes!("ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"abcdefghijklmnopqrstuvwxyz",
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"0123456789+/");
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static URLSAFE_CHARS: &'static[u8] = bytes!("ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"abcdefghijklmnopqrstuvwxyz",
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"0123456789-_");
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/// A trait for converting a value to base64 encoding.
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pub trait ToBase64 {
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/// Converts the value of `self` to a base64 value following the specified
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/// format configuration, returning the owned string.
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fn to_base64(&self, config: Config) -> ~str;
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}
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impl<'self> ToBase64 for &'self [u8] {
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/**
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* Turn a vector of `u8` bytes into a base64 string.
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*
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* # Example
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*
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* ~~~ {.rust}
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* extern mod extra;
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* use extra::base64::{ToBase64, standard};
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*
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* fn main () {
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* let str = [52,32].to_base64(standard);
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* printfln!("%s", str);
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* }
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* ~~~
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*/
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fn to_base64(&self, config: Config) -> ~str {
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let bytes = match config.char_set {
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Standard => STANDARD_CHARS,
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UrlSafe => URLSAFE_CHARS
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};
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let mut v: ~[u8] = ~[];
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let mut i = 0;
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let mut cur_length = 0;
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let len = self.len();
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while i < len - (len % 3) {
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match config.line_length {
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Some(line_length) =>
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if cur_length >= line_length {
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v.push('\r' as u8);
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v.push('\n' as u8);
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cur_length = 0;
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},
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None => ()
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}
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let n = (self[i] as u32) << 16 |
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(self[i + 1] as u32) << 8 |
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(self[i + 2] as u32);
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// This 24-bit number gets separated into four 6-bit numbers.
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v.push(bytes[(n >> 18) & 63]);
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v.push(bytes[(n >> 12) & 63]);
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v.push(bytes[(n >> 6 ) & 63]);
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v.push(bytes[n & 63]);
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cur_length += 4;
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i += 3;
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}
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if len % 3 != 0 {
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match config.line_length {
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Some(line_length) =>
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if cur_length >= line_length {
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v.push('\r' as u8);
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v.push('\n' as u8);
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},
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None => ()
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}
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}
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// Heh, would be cool if we knew this was exhaustive
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// (the dream of bounded integer types)
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match len % 3 {
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0 => (),
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1 => {
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let n = (self[i] as u32) << 16;
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v.push(bytes[(n >> 18) & 63]);
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v.push(bytes[(n >> 12) & 63]);
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if config.pad {
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v.push('=' as u8);
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v.push('=' as u8);
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}
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}
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2 => {
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let n = (self[i] as u32) << 16 |
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(self[i + 1u] as u32) << 8;
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v.push(bytes[(n >> 18) & 63]);
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v.push(bytes[(n >> 12) & 63]);
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v.push(bytes[(n >> 6 ) & 63]);
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if config.pad {
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v.push('=' as u8);
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}
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}
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_ => fail!("Algebra is broken, please alert the math police")
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}
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unsafe {
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str::raw::from_bytes_owned(v)
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}
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}
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}
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/// A trait for converting from base64 encoded values.
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pub trait FromBase64 {
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/// Converts the value of `self`, interpreted as base64 encoded data, into
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/// an owned vector of bytes, returning the vector.
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fn from_base64(&self) -> Result<~[u8], ~str>;
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}
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impl<'self> FromBase64 for &'self str {
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/**
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* Convert any base64 encoded string (literal, `@`, `&`, or `~`)
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* to the byte values it encodes.
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*
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* You can use the `from_bytes` function in `std::str`
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* to turn a `[u8]` into a string with characters corresponding to those
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* values.
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*
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* # Example
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*
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* This converts a string literal to base64 and back.
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*
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* ~~~ {.rust}
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* extern mod extra;
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* use extra::base64::{ToBase64, FromBase64, standard};
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* use std::str;
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*
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* fn main () {
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* let hello_str = "Hello, World".to_base64(standard);
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* printfln!("%s", hello_str);
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* let bytes = hello_str.from_base64();
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* printfln!("%?", bytes);
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* let result_str = str::from_bytes(bytes);
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* printfln!("%s", result_str);
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* }
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* ~~~
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*/
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fn from_base64(&self) -> Result<~[u8], ~str> {
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let mut r = ~[];
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let mut buf: u32 = 0;
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let mut modulus = 0;
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let mut it = self.byte_iter().enumerate();
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for (idx, byte) in it {
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let val = byte as u32;
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match byte as char {
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'A'..'Z' => buf |= val - 0x41,
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'a'..'z' => buf |= val - 0x47,
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'0'..'9' => buf |= val + 0x04,
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'+'|'-' => buf |= 0x3E,
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'/'|'_' => buf |= 0x3F,
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'\r'|'\n' => loop,
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'=' => break,
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_ => return Err(fmt!("Invalid character '%c' at position %u",
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self.char_at(idx), idx))
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}
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buf <<= 6;
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modulus += 1;
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if modulus == 4 {
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modulus = 0;
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r.push((buf >> 22) as u8);
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r.push((buf >> 14) as u8);
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r.push((buf >> 6 ) as u8);
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}
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}
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for (idx, byte) in it {
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if (byte as char) != '=' {
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return Err(fmt!("Invalid character '%c' at position %u",
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self.char_at(idx), idx));
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}
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}
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match modulus {
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2 => {
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r.push((buf >> 10) as u8);
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}
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3 => {
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r.push((buf >> 16) as u8);
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r.push((buf >> 8 ) as u8);
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}
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0 => (),
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_ => return Err(~"Invalid Base64 length")
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}
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Ok(r)
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}
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}
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#[cfg(test)]
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mod test {
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use test::BenchHarness;
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use base64::*;
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#[test]
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fn test_to_base64_basic() {
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assert_eq!("".as_bytes().to_base64(STANDARD), ~"");
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assert_eq!("f".as_bytes().to_base64(STANDARD), ~"Zg==");
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assert_eq!("fo".as_bytes().to_base64(STANDARD), ~"Zm8=");
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assert_eq!("foo".as_bytes().to_base64(STANDARD), ~"Zm9v");
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assert_eq!("foob".as_bytes().to_base64(STANDARD), ~"Zm9vYg==");
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assert_eq!("fooba".as_bytes().to_base64(STANDARD), ~"Zm9vYmE=");
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assert_eq!("foobar".as_bytes().to_base64(STANDARD), ~"Zm9vYmFy");
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}
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#[test]
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fn test_to_base64_line_break() {
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assert!(![0u8, 1000].to_base64(Config {line_length: None, ..STANDARD})
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.contains("\r\n"));
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assert_eq!("foobar".as_bytes().to_base64(Config {line_length: Some(4),
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..STANDARD}),
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~"Zm9v\r\nYmFy");
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}
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#[test]
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fn test_to_base64_padding() {
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assert_eq!("f".as_bytes().to_base64(Config {pad: false, ..STANDARD}), ~"Zg");
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assert_eq!("fo".as_bytes().to_base64(Config {pad: false, ..STANDARD}), ~"Zm8");
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}
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#[test]
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fn test_to_base64_url_safe() {
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assert_eq!([251, 255].to_base64(URL_SAFE), ~"-_8");
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assert_eq!([251, 255].to_base64(STANDARD), ~"+/8=");
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}
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#[test]
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fn test_from_base64_basic() {
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assert_eq!("".from_base64().unwrap(), "".as_bytes().to_owned());
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assert_eq!("Zg==".from_base64().unwrap(), "f".as_bytes().to_owned());
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assert_eq!("Zm8=".from_base64().unwrap(), "fo".as_bytes().to_owned());
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assert_eq!("Zm9v".from_base64().unwrap(), "foo".as_bytes().to_owned());
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assert_eq!("Zm9vYg==".from_base64().unwrap(), "foob".as_bytes().to_owned());
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assert_eq!("Zm9vYmE=".from_base64().unwrap(), "fooba".as_bytes().to_owned());
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assert_eq!("Zm9vYmFy".from_base64().unwrap(), "foobar".as_bytes().to_owned());
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}
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#[test]
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fn test_from_base64_newlines() {
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assert_eq!("Zm9v\r\nYmFy".from_base64().unwrap(),
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"foobar".as_bytes().to_owned());
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}
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#[test]
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fn test_from_base64_urlsafe() {
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assert_eq!("-_8".from_base64().unwrap(), "+/8=".from_base64().unwrap());
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}
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#[test]
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fn test_from_base64_invalid_char() {
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assert!("Zm$=".from_base64().is_err())
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assert!("Zg==$".from_base64().is_err());
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}
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#[test]
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fn test_from_base64_invalid_padding() {
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assert!("Z===".from_base64().is_err());
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}
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#[test]
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fn test_base64_random() {
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use std::rand::{task_rng, random, RngUtil};
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use std::vec;
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do 1000.times {
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let v: ~[u8] = do vec::build |push| {
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do task_rng().gen_uint_range(1, 100).times {
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push(random());
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}
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};
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assert_eq!(v.to_base64(STANDARD).from_base64().unwrap(), v);
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}
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}
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#[bench]
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pub fn bench_to_base64(bh: & mut BenchHarness) {
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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 \
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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";
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do bh.iter {
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s.as_bytes().to_base64(STANDARD);
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}
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bh.bytes = s.len() as u64;
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}
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#[bench]
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pub fn bench_from_base64(bh: & mut BenchHarness) {
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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 \
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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";
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let b = s.as_bytes().to_base64(STANDARD);
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do bh.iter {
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b.from_base64();
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}
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bh.bytes = b.len() as u64;
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}
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}
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