### Validating Result with Predicate

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Example of using is_ok_and to check a Result against a predicate.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.is_ok_and(|x| x > 1), true);

let x: Result<u32, &str> = Ok(0);
assert_eq!(x.is_ok_and(|x| x > 1), false);

let x: Result<u32, &str> = Err("hey");
assert_eq!(x.is_ok_and(|x| x > 1), false);

let x: Result<String, &str> = Ok("ownership".to_string());
assert_eq!(x.as_ref().is_ok_and(|x| x.len() > 1), true);
println!("still alive {:?}", x);
```

--------------------------------

### Cloning Result Contents

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html

Examples of using the cloned method on Result types containing references.

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

--------------------------------

### Unwrap Unchecked Examples

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Demonstrates the use of unwrap_unchecked to retrieve values without safety checks. Calling this on an Err variant results in undefined behavior.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(unsafe { x.unwrap_unchecked() }, 2);
```

```rust
let x: Result<u32, &str> = Err("emergency failure");
unsafe { x.unwrap_unchecked() }; // Undefined behavior!
```

--------------------------------

### Copying Result Contents

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html

Examples of using the copied method on Result types containing references.

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

--------------------------------

### Checking Result Status

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Examples of checking if a Result is Ok or Err.

```rust
let x: Result<i32, &str> = Ok(-3);
assert_eq!(x.is_ok(), true);

let x: Result<i32, &str> = Err("Some error message");
assert_eq!(x.is_ok(), false);
```

```rust
let x: Result<i32, &str> = Ok(-3);
assert_eq!(x.is_err(), false);

let x: Result<i32, &str> = Err("Some error message");
assert_eq!(x.is_err(), true);
```

--------------------------------

### Unwrap Err Unchecked Examples

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Demonstrates the use of unwrap_err_unchecked to retrieve error values without safety checks. Calling this on an Ok variant results in undefined behavior.

```rust
let x: Result<u32, &str> = Ok(2);
unsafe { x.unwrap_err_unchecked() }; // Undefined behavior!
```

```rust
let x: Result<u32, &str> = Err("emergency failure");
assert_eq!(unsafe { x.unwrap_err_unchecked() }, "emergency failure");
```

--------------------------------

### into_ok

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Returns the contained Ok value without panicking.

```APIDOC
## pub const fn into_ok(self) -> T

### Description
Returns the contained `Ok` value, but never panics. This is a nightly-only experimental API.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance.

### Example
```rust
let s: String = only_good_news().into_ok();
```
```

--------------------------------

### into_ok

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Returns the contained Ok value without panicking.

```APIDOC
## pub const fn into_ok(self) -> T

### Description
Returns the contained `Ok` value, but never panics. This is a nightly-only experimental API.
```

--------------------------------

### Library Module Exports

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/lib.rs.html?search=u32+-%3E+bool

The main entry point for the crate, exposing alphabet variants, encoding traits, and error handling types.

```rust
pub use crate::{
    alphabet::rfc4648::{Base32, Base32Unpadded, Base32Upper, Base32UpperUnpadded},
    encoding::{Encoding, encoded_len},
    error::{Error, Result},
};
```

--------------------------------

### Into Ok

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Extracts the Ok value without panicking, intended for infallible results.

```rust

fn only_good_news() -> Result<String, !> {
    Ok("this is fine".into())
}

let s: String = only_good_news().into_ok();
println!("{s}");
```

--------------------------------

### Library Module Configuration

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/lib.rs.html?search=

The core library configuration including no_std support, feature flags, and public API exports.

```rust
1//! Pure Rust implementation of Base32 ([RFC 4648]).
2//!
3//! Implements Base32 variants without data-dependent branches
4//! or lookup  tables, thereby providing portable "best effort" constant-time
5//! operation. Not constant-time with respect to message length (only data).
6//!
7//! Supports `no_std` environments and avoids heap allocations in the core API
8//! (but also provides optional `alloc` support for convenience).
9//!
10//! Adapted from: <https://github.com/paragonie/constant_time_encoding/blob/master/src/Base32.php>
11//!
12//! [RFC 4648]: https://tools.ietf.org/html/rfc4648
13
14// Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
15// Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com).
16//
17// Permission is hereby granted, free of charge, to any person obtaining a copy
18// of this software and associated documentation files (the "Software"), to deal
19// in the Software without restriction, including without limitation the rights
20// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
21// copies of the Software, and to permit persons to whom the Software is
22// furnished to do so, subject to the following conditions:
23//
24// The above copyright notice and this permission notice shall be included in all
25// copies or substantial portions of the Software.
26//
27// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
30// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
31// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
32// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33// SOFTWARE.
34
35#![no_std]
36#![cfg_attr(docsrs, feature(doc_cfg))]
37#![doc(
38    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
39    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg"
40)]
41#![warn(
42    clippy::mod_module_files,
43    clippy::unwrap_used,
44    missing_docs,
45    rust_2018_idioms,
46    unused_lifetimes,
47    unused_qualifications
48)]
49
50#[cfg(feature = "alloc")]
51#[macro_use]
52extern crate alloc;
53
54mod alphabet;
55mod encoding;
56mod error;
57
58pub use crate::{
59    alphabet::rfc4648::{Base32, Base32Unpadded, Base32Upper, Base32UpperUnpadded},
60    encoding::{Encoding, encoded_len},
61    error::{Error, Result},
62};
```

--------------------------------

### expect

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the contained Ok value, or panics if the result is Err.

```APIDOC
## pub fn expect(self, msg: &str) -> T

### Description
Returns the contained `Ok` value, consuming the `self` value. Panics if the value is an `Err`, with a panic message including the passed message, and the content of the `Err`.
```

--------------------------------

### Fallback to alternative Result with or

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the current Result if it is Ok, otherwise returns the provided alternative Result.

```rust
let x: Result<u32, &str> = Ok(2);
let y: Result<u32, &str> = Err("late error");
assert_eq!(x.or(y), Ok(2));

let x: Result<u32, &str> = Err("early error");
let y: Result<u32, &str> = Ok(2);
assert_eq!(x.or(y), Ok(2));

let x: Result<u32, &str> = Err("not a 2");
let y: Result<u32, &str> = Err("late error");
assert_eq!(x.or(y), Err("late error"));

let x: Result<u32, &str> = Ok(2);
let y: Result<u32, &str> = Ok(100);
assert_eq!(x.or(y), Ok(2));
```

--------------------------------

### Chain Results with And

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the provided result if the current one is Ok, otherwise returns the Err.

```rust
let x: Result<u32, &str> = Ok(2);
let y: Result<&str, &str> = Err("late error");
assert_eq!(x.and(y), Err("late error"));

let x: Result<u32, &str> = Err("early error");
let y: Result<&str, &str> = Ok("foo");
assert_eq!(x.and(y), Err("early error"));

let x: Result<u32, &str> = Err("not a 2");
let y: Result<&str, &str> = Err("late error");
assert_eq!(x.and(y), Err("not a 2"));

let x: Result<u32, &str> = Ok(2);
let y: Result<&str, &str> = Ok("different result type");
assert_eq!(x.and(y), Ok("different result type"));
```

--------------------------------

### unwrap

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Returns the contained Ok value, consuming the self value. Panics if the value is an Err.

```APIDOC
## pub fn unwrap(self) -> T

### Description
Returns the contained `Ok` value, consuming the `self` value. Because this function may panic, its use is generally discouraged.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance to unwrap.

### Example
```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.unwrap(), 2);
```
```

--------------------------------

### unwrap

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Returns the contained Ok value, consuming the self value. Panics if the value is an Err.

```APIDOC
## pub fn unwrap(self) -> T

### Description
Returns the contained `Ok` value, consuming the `self` value. Because this function may panic, its use is generally discouraged.

### Panics
Panics if the value is an `Err`, with a panic message provided by the `Err`’s value.
```

--------------------------------

### Provide default value with unwrap_or

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the contained Ok value or the provided default value if the result is Err.

```rust
let default = 2;
let x: Result<u32, &str> = Ok(9);
assert_eq!(x.unwrap_or(default), 9);

let x: Result<u32, &str> = Err("error");
assert_eq!(x.unwrap_or(default), default);
```

--------------------------------

### encode_string

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32.html?search=std%3A%3Avec

Encodes input byte slice into a String containing Base32. Requires the 'alloc' feature.

```APIDOC
## fn encode_string(input: &[u8]) -> String

### Description
Encode input byte slice into a `String` containing Base32. Available on crate feature `alloc` only.
```

--------------------------------

### Base32 String Encoding

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html

Allocates a new String for the Base32 encoded output. Requires the 'alloc' feature.

```rust
#[cfg(feature = "alloc")]
fn encode_string(input: &[u8]) -> String {
    let elen = Self::encoded_len(input);
    let mut dst = vec![0u8; elen];
    let res = Self::encode(input, &mut dst).expect("encoding error");

    debug_assert_eq!(elen, res.len());
    debug_assert!(str::from_utf8(&dst).is_ok());

    // SAFETY: `dst` is fully written and contains only valid one-byte UTF-8 chars
    #[allow(unsafe_code)]
    unsafe {
        String::from_utf8_unchecked(dst)
    }
}
```

--------------------------------

### Encoding::encode_string

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32Upper.html?search=std%3A%3Avec

Encodes an input byte slice into a String containing Base32. Requires the 'alloc' crate feature.

```APIDOC
fn encode_string(input: &[u8]) -> String
```

--------------------------------

### Define RFC4648 Base32 Alphabet Structures

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/alphabet/rfc4648.rs.html

Implementations for lower and upper case Base32 alphabets with optional padding.

```rust
//! RFC4648 Base32 alphabet.

use super::{Alphabet, DecodeStep, EncodeStep};

/// RFC4648 lower case Base32 encoding with `=` padding.
///
/// ```text
/// [a-z]      [2-7]
/// 0x61-0x7a, 0x32-0x37
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Base32;

impl Alphabet for Base32 {
    const BASE: u8 = b'a';
    const DECODER: &'static [DecodeStep] = DECODE_LOWER;
    const ENCODER: &'static [EncodeStep] = ENCODE_LOWER;
    const PADDED: bool = true;
}

/// RFC4648 lower case Base32 encoding *without* padding.
///
/// ```text
/// [a-z]      [2-7]
/// 0x61-0x7a, 0x32-0x37
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Base32Unpadded;

impl Alphabet for Base32Unpadded {
    const BASE: u8 = b'a';
    const DECODER: &'static [DecodeStep] = DECODE_LOWER;
    const ENCODER: &'static [EncodeStep] = ENCODE_LOWER;
    const PADDED: bool = false;
}

/// Lower-case Base32 decoder.
const DECODE_LOWER: &[DecodeStep] = &[DecodeStep(b'a'..=b'z', -96), DecodeStep(b'2'..=b'7', -23)];

/// Standard Base64 encoder
const ENCODE_LOWER: &[EncodeStep] = &[EncodeStep(25, 73)];

/// RFC4648 upper case Base32 encoding with `=` padding.
///
/// ```text
/// [A-Z]      [2-7]
/// 0x41-0x5a, 0x32-0x37
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Base32Upper;

impl Alphabet for Base32Upper {
    const BASE: u8 = b'A';
    const DECODER: &'static [DecodeStep] =
        &[DecodeStep(b'A'..=b'Z', -64), DecodeStep(b'2'..=b'7', -23)];
    const ENCODER: &'static [EncodeStep] = &[EncodeStep(25, 41)];
    const PADDED: bool = true;
}

/// RFC4648 upper case Base32 encoding *without* padding.
///
/// ```text
/// [A-Z]      [2-7]
/// 0x41-0x5a, 0x32-0x37
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Base32UpperUnpadded;

impl Alphabet for Base32UpperUnpadded {
    const BASE: u8 = b'A';
    const DECODER: &'static [DecodeStep] =
        &[DecodeStep(b'A'..=b'Z', -64), DecodeStep(b'2'..=b'7', -23)];
    const ENCODER: &'static [EncodeStep] = &[EncodeStep(25, 41)];
    const PADDED: bool = false;
}
```

--------------------------------

### encode_string

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32UpperUnpadded.html?search=std%3A%3Avec

Encodes an input byte slice into a String. Requires the 'alloc' feature.

```APIDOC
## fn encode_string(input: &[u8]) -> String

### Description
Encode input byte slice into a String containing Base32. Available on crate feature 'alloc' only.
```

--------------------------------

### fn encode_string

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=

Encodes a byte slice into a String. Requires the 'alloc' feature.

```APIDOC
### fn encode_string(input: &[u8]) -> String

Encode input byte slice into a `String` containing Base32. Available on crate feature `alloc` only.
```

--------------------------------

### unwrap_or_default

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Returns the contained Ok value or a default value if the result is Err.

```APIDOC
## pub fn unwrap_or_default(self) -> T

### Description
Consumes the `self` argument then, if `Ok`, returns the contained value, otherwise if `Err`, returns the default value for that type.
```

--------------------------------

### pub fn unwrap_or(self, default: T) -> T

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Returns the contained Ok value or a provided default value.

```APIDOC
## pub fn unwrap_or(self, default: T) -> T

### Description
Returns the contained `Ok` value or a provided default. Arguments passed to `unwrap_or` are eagerly evaluated.

### Parameters
- **default** (T) - Required - The default value to return if the result is Err.
```

--------------------------------

### Length Calculation Utilities

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Functions to determine the required buffer sizes for encoding and decoding.

```rust
#[inline]
fn encoded_len(bytes: &[u8]) -> usize {
    encoded_len::<Self>(bytes.len())
}

/// Get the length of the output from decoding the provided *unpadded*
/// Base32-encoded input.
///
/// Note that this function does not fully validate the Base32 is well-formed
/// and may return incorrect results for malformed Base32.
// TODO(tarcieri): checked/overflow-proof arithmetic
#[inline(always)]
fn decoded_len(input_len: usize) -> usize {
    (input_len * 5) / 8
}

/// Get the length of Base32 produced by encoding the given amount of bytes.
pub const fn encoded_len<T: Encoding>(length: usize) -> usize {
    if length == 0 {
        0
    } else if T::PADDED {
        ((length - 1) / 5 + 1) * 8
    } else {
        (length * 8).div_ceil(5)
    }
}
```

--------------------------------

### encode

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32UpperUnpadded.html?search=std%3A%3Avec

Encodes the input byte slice as Base32 into the provided destination buffer.

```APIDOC
## fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str, Error>

### Description
Encode the input byte slice as Base32.
```

--------------------------------

### unwrap_or_default

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Returns the contained Ok value or a default value if the result is an Err.

```APIDOC
## pub fn unwrap_or_default(self) -> T

### Description
Consumes the `self` argument then, if `Ok`, returns the contained value, otherwise if `Err`, returns the default value for that type.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance to process.

### Example
```rust
let good_year = "1909".parse().unwrap_or_default();
let bad_year = "190blarg".parse().unwrap_or_default();
assert_eq!(1909, good_year);
assert_eq!(0, bad_year);
```
```

--------------------------------

### Reference conversion with as_ref and as_mut

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Converts a Result to a Result containing references to the original values.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.as_ref(), Ok(&2));

let x: Result<u32, &str> = Err("Error");
assert_eq!(x.as_ref(), Err(&"Error"));
```

```rust
fn mutate(r: &mut Result<i32, i32>) {
    match r.as_mut() {
        Ok(v) => *v = 42,
        Err(e) => *e = 0,
    }
}

let mut x: Result<i32, i32> = Ok(2);
mutate(&mut x);
assert_eq!(x.unwrap(), 42);

let mut x: Result<i32, i32> = Err(13);
mutate(&mut x);
assert_eq!(x.unwrap_err(), 0);
```

--------------------------------

### Encoding::encode

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32Upper.html?search=std%3A%3Avec

Encodes the input byte slice as Base32 into the provided destination buffer.

```APIDOC
fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str, Error>
```

--------------------------------

### Lower-case Base32 Decoder and Encoder Constants

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/alphabet/rfc4648.rs.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Constants defining the decoding steps and encoding steps for lower-case Base32.

```rust
/// Lower-case Base32 decoder.
const DECODE_LOWER: &[DecodeStep] = &[DecodeStep(b'a'..=b'z', -96), DecodeStep(b'2'..=b'7', -23)];

/// Standard Base64 encoder
const ENCODE_LOWER: &[EncodeStep] = &[EncodeStep(25, 73)];
```

--------------------------------

### pub fn unwrap_or_else<F>(self, op: F) -> T

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Returns the contained Ok value or computes it from a provided closure.

```APIDOC
## pub fn unwrap_or_else<F>(self, op: F) -> T

### Description
Returns the contained `Ok` value or computes it from a closure if the result is `Err`.

### Parameters
- **op** (FnOnce(E) -> T) - Required - The closure to execute to compute the default value if the result is Err.
```

--------------------------------

### Unwrap with Default Value

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the Ok value or the default value of the type if the result is an Err.

```rust
let good_year_from_input = "1909";
let bad_year_from_input = "190blarg";
let good_year = good_year_from_input.parse().unwrap_or_default();
let bad_year = bad_year_from_input.parse().unwrap_or_default();

assert_eq!(1909, good_year);
assert_eq!(0, bad_year);
```

--------------------------------

### pub fn or<F>(self, res: Result<T, F>) -> Result<T, F>

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Returns the provided result if the current result is Err, otherwise returns the Ok value of the current result.

```APIDOC
## pub fn or<F>(self, res: Result<T, F>) -> Result<T, F>

### Description
Returns `res` if the result is `Err`, otherwise returns the `Ok` value of `self`. Arguments passed to `or` are eagerly evaluated.

### Parameters
- **res** (Result<T, F>) - Required - The result to return if the current result is Err.
```

--------------------------------

### Expect Result Value

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the Ok value or panics with a provided message if the Result is Err.

```rust
let x: Result<u32, &str> = Err("emergency failure");
x.expect("Testing expect"); // panics with `Testing expect: emergency failure`
```

```rust
let path = std::env::var("IMPORTANT_PATH")
    .expect("env variable `IMPORTANT_PATH` should be set by `wrapper_script.sh`");
```

--------------------------------

### Convert Result to Option

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Methods to convert Result into Option by either keeping the Ok value or the Err value.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.ok(), Some(2));

let x: Result<u32, &str> = Err("Nothing here");
assert_eq!(x.ok(), None);
```

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.err(), None);

let x: Result<u32, &str> = Err("Nothing here");
assert_eq!(x.err(), Some("Nothing here"));
```

--------------------------------

### Inspect Ok Value

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Executes a closure with a reference to the Ok value without modifying the result.

```rust
let x: u8 = "4"
    .parse::<u8>()
    .inspect(|x| println!("original: {x}"))
    .map(|x| x.pow(3))
    .expect("failed to parse number");
```

--------------------------------

### Into Ok Infallible

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Extracts the Ok value without risk of panicking, useful for compile-time safety.

```rust
fn only_good_news() -> Result<String, !> {
    Ok("this is fine".into())
}

let s: String = only_good_news().into_ok();
println!("{s}");
```

--------------------------------

### Map Result to default or fallback

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Methods to handle Result by providing a default value or a fallback function.

```rust
let x: Result<_, &str> = Ok("foo");
assert_eq!(x.map_or(42, |v| v.len()), 3);

let x: Result<&str, _> = Err("bar");
assert_eq!(x.map_or(42, |v| v.len()), 42);
```

```rust
let k = 21;

let x : Result<_, &str> = Ok("foo");
assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);

let x : Result<&str, _> = Err("bar");
assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
```

```rust
let x: Result<_, &str> = Ok("foo");
let y: Result<&str, _> = Err("bar");

assert_eq!(x.map_or_default(|x| x.len()), 3);
assert_eq!(y.map_or_default(|y| y.len()), 0);
```

--------------------------------

### Base32 Length Utilities

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=std%3A%3Avec

Helper functions to calculate decoded length and remove padding from Base32 inputs.

```rust
#[inline(always)]
fn decoded_len(input_len: usize) -> usize {
    (input_len * 5) / 8
}

/// Remove padding from the provided input.
fn remove_padding(mut input: &[u8]) -> Result<&[u8]> {
    // TODO(tarcieri): properly validate padding
    if input.len() % 8 != 0 {
        return Err(Error::InvalidEncoding);
    }

    for _ in 0..6 {
        match input.split_last() {
            Some((b'=', rest)) => input = rest,
            _ => break,
        }
    }

    Ok(input)
}

/// Get the length of Base32 produced by encoding the given amount of bytes.
pub const fn encoded_len<T: Encoding>(length: usize) -> usize {
    if length == 0 {
        0
    } else if T::PADDED {
        ((length - 1) / 5 + 1) * 8
    } else {
        (length * 8).div_ceil(5)
    }
}
```

--------------------------------

### decode

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32UpperUnpadded.html?search=std%3A%3Avec

Decodes a Base32-encoded string into the provided output buffer.

```APIDOC
## fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8], Error>

### Description
Decode a Base32-encoded string into the provided output buffer, returning a slice containing the decoded data.
```

--------------------------------

### and_then

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Calls op if the result is Ok, otherwise returns the Err value of self.

```APIDOC
## pub fn and_then<U, F>(self, op: F) -> Result<U, E>

### Description
Calls `op` if the result is `Ok`, otherwise returns the `Err` value of `self`. This function can be used for control flow based on `Result` values.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance.
- **op** (F) - Required - A function that takes the Ok value and returns a new Result.

### Example
```rust
fn sq_then_to_string(x: u32) -> Result<String, &'static str> {
    x.checked_mul(x).map(|sq| sq.to_string()).ok_or("overflowed")
}
```
```

--------------------------------

### and_then

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Calls op if the result is Ok, otherwise returns the Err value of self.

```APIDOC
## pub fn and_then<U, F>(self, op: F) -> Result<U, E>

### Description
Calls `op` if the result is `Ok`, otherwise returns the `Err` value of `self`. This function can be used for control flow based on `Result` values.
```

--------------------------------

### Unwrap Error

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the Err value or panics if the result is an Ok.

```rust
let x: Result<u32, &str> = Ok(2);
x.unwrap_err(); // panics with `2`
```

```rust
let x: Result<u32, &str> = Err("emergency failure");
assert_eq!(x.unwrap_err(), "emergency failure");
```

--------------------------------

### into_err

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Returns the contained Err value without panicking.

```APIDOC
## pub const fn into_err(self) -> E

### Description
Returns the contained `Err` value, but never panics. This is a nightly-only experimental API.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance.

### Example
```rust
let error: String = only_bad_news().into_err();
```
```

--------------------------------

### into_err

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Returns the contained Err value without panicking.

```APIDOC
## pub const fn into_err(self) -> E

### Description
Returns the contained `Err` value, but never panics. This is a nightly-only experimental API.
```

--------------------------------

### Copying and Cloning Result Contents

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Methods to map Result<&T, E> or Result<&mut T, E> to Result<T, E> by copying or cloning the inner value.

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

--------------------------------

### Collect Result from Iterator

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Demonstrates how collecting an iterator of Results short-circuits upon encountering the first Err variant.

```rust
let v = vec![1, 2];
let res: Result<Vec<u32>, &'static str> = v.iter().map(|x: &u32|
    x.checked_add(1).ok_or("Overflow!")
).collect();
assert_eq!(res, Ok(vec![2, 3]));
```

```rust
let v = vec![1, 2, 0];
let res: Result<Vec<u32>, &'static str> = v.iter().map(|x: &u32|
    x.checked_sub(1).ok_or("Underflow!")
).collect();
assert_eq!(res, Err("Underflow!"));
```

```rust
let v = vec![3, 2, 1, 10];
let mut shared = 0;
let res: Result<Vec<u32>, &'static str> = v.iter().map(|x: &u32| {
    shared += x;
    x.checked_sub(2).ok_or("Underflow!")
}).collect();
assert_eq!(res, Err("Underflow!"));
assert_eq!(shared, 6);
```

--------------------------------

### Unwrap Result with Closure

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html

Demonstrates using unwrap_or_else to provide a fallback value via a closure.

```rust
assert_eq!(Ok(2).unwrap_or_else(count), 2);
assert_eq!(Err("foo").unwrap_or_else(count), 3);
```

--------------------------------

### Expect Error

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the Err value or panics with a custom message if the result is an Ok.

```rust
let x: Result<u32, &str> = Ok(10);
x.expect_err("Testing expect_err"); // panics with `Testing expect_err: 10`
```

--------------------------------

### as_deref_mut

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Converts from Result<T, E> to Result<&mut <T as DerefMut>::Target, &mut E>.

```APIDOC
## pub fn as_deref_mut(&mut self) -> Result<&mut <T as DerefMut>::Target, &mut E>

### Description
Converts from `Result<T, E>` (or `&mut Result<T, E>`) to `Result<&mut <T as DerefMut>::Target, &mut E>`. Coerces the `Ok` variant of the original `Result` via `DerefMut` and returns the new `Result`.
```

--------------------------------

### and

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=std%3A%3Avec

Returns res if the result is Ok, otherwise returns the Err value of self.

```APIDOC
## pub fn and<U>(self, res: Result<U, E>) -> Result<U, E>

### Description
Returns `res` if the result is `Ok`, otherwise returns the `Err` value of `self`.

### Parameters
- **self** (Result<T, E>) - Required - The Result instance.
- **res** (Result<U, E>) - Required - The result to return if self is Ok.

### Example
```rust
let x: Result<u32, &str> = Ok(2);
let y: Result<&str, &str> = Err("late error");
assert_eq!(x.and(y), Err("late error"));
```
```

--------------------------------

### and

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Returns res if the result is Ok, otherwise returns the Err value of self.

```APIDOC
## pub fn and<U>(self, res: Result<U, E>) -> Result<U, E>

### Description
Returns `res` if the result is `Ok`, otherwise returns the `Err` value of `self`.
```

--------------------------------

### inspect

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Calls a function with a reference to the contained value if Ok, returning the original result.

```APIDOC
## pub fn inspect<F>(self, f: F) -> Result<T, E>

### Description
Calls a function with a reference to the contained value if `Ok`. Returns the original result.
```

--------------------------------

### Base32 Length Utilities

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html

Helper functions to calculate decoded length and encoded length for Base32 data.

```rust
#[inline]
fn encoded_len(bytes: &[u8]) -> usize {
    encoded_len::<Self>(bytes.len())
}

#[inline(always)]
fn decoded_len(input_len: usize) -> usize {
    (input_len * 5) / 8
}

pub const fn encoded_len<T: Encoding>(length: usize) -> usize {
    if length == 0 {
        0
    } else if T::PADDED {
        ((length - 1) / 5 + 1) * 8
    } else {
        (length * 8).div_ceil(5)
    }
}
```

--------------------------------

### Encoding Trait Methods

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=std%3A%3Avec

The Encoding trait provides methods for Base32 conversion. Note that decode_vec and encode_string require the 'alloc' feature.

```APIDOC
## fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8]>

### Description
Decodes a Base32-encoded string into the provided output buffer, returning a slice containing the decoded data.

## fn decode_vec(input: &str) -> Result<Vec<u8>>

### Description
Decodes a Base32 string into a byte vector. Requires the 'alloc' feature.

## fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str>

### Description
Encodes the input byte slice as Base32, writing the result into the provided destination slice and returning the resulting ASCII-encoded string.

## fn encode_string(input: &[u8]) -> String

### Description
Encodes an input byte slice into a String containing Base32. Requires the 'alloc' feature.

## fn encoded_len(bytes: &[u8]) -> usize

### Description
Calculates the length of the Base32 string produced by encoding the given bytes.
```

--------------------------------

### Encoding Trait Methods

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html

The Encoding trait provides methods for Base32 encoding and decoding. Note that some methods require the 'alloc' feature.

```APIDOC
## fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8]>

### Description
Decode a Base32-encoded string into the provided output buffer, returning a slice containing the decoded data.

## fn decode_vec(input: &str) -> Result<Vec<u8>>

### Description
Decode a Base32 string into a byte vector. Available on crate feature `alloc` only.

## fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str>

### Description
Encode the input byte slice as Base32. Writes the result into the provided destination slice, returning an ASCII-encoded Base32 string value.

## fn encode_string(input: &[u8]) -> String

### Description
Encode input byte slice into a `String` containing Base32. Available on crate feature `alloc` only.

## fn encoded_len(bytes: &[u8]) -> usize

### Description
Get the length of Base32 produced by encoding the given bytes.
```

--------------------------------

### Encoding Trait Methods

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

The Encoding trait provides methods for Base32 encoding and decoding. Note that some methods require the 'alloc' feature.

```APIDOC
## fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8]>

### Description
Decodes a Base32-encoded string into the provided output buffer.

## fn decode_vec(input: &str) -> Result<Vec<u8>>

### Description
Decodes a Base32 string into a byte vector. Requires 'alloc' feature.

## fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str>

### Description
Encodes the input byte slice as Base32 into the provided destination slice.

## fn encode_string(input: &[u8]) -> String

### Description
Encodes input byte slice into a String containing Base32. Requires 'alloc' feature.

## fn encoded_len(bytes: &[u8]) -> usize

### Description
Calculates the length of the Base32 output produced by encoding the given bytes.
```

--------------------------------

### as_deref

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Converts from Result<T, E> to Result<&<T as Deref>::Target, &E>.

```APIDOC
## pub fn as_deref(&self) -> Result<&<T as Deref>::Target, &E>

### Description
Converts from `Result<T, E>` (or `&Result<T, E>`) to `Result<&<T as Deref>::Target, &E>`. Coerces the `Ok` variant of the original `Result` via `Deref` and returns the new `Result`.
```

--------------------------------

### fn decode

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=

Decodes a Base32-encoded input into a provided destination buffer.

```APIDOC
### fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8]>

Decodes a Base32-encoded string into the provided output buffer, returning a slice containing the decoded data.
```

--------------------------------

### Map Result values

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Applies a function to the contained Ok value.

```rust
let line = "1\n2\n3\n4\n";

for num in line.lines() {
    match num.parse::<i32>().map(|i| i * 2) {
        Ok(n) => println!("{n}"),
        Err(..) => {}
    }
}
```

--------------------------------

### Into Error

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=

Extracts the Err value without panicking, intended for infallible results.

```rust

fn only_bad_news() -> Result<!, String> {
    Err("Oops, it failed".into())
}

let error: String = only_bad_news().into_err();
println!("{error}");
```

--------------------------------

### fn encode

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=

Encodes a byte slice into a provided destination buffer as a Base32 string.

```APIDOC
### fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str>

Encode the input byte slice as Base32. Writes the result into the provided destination slice, returning an ASCII-encoded Base32 string value.
```

--------------------------------

### Encoding::decode

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32Upper.html?search=std%3A%3Avec

Decodes a Base32-encoded string into the provided output buffer.

```APIDOC
fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8], Error>
```

--------------------------------

### pub fn or_else<F, O>(self, op: O) -> Result<T, F>

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Calls the provided closure if the result is Err, otherwise returns the Ok value of the current result.

```APIDOC
## pub fn or_else<F, O>(self, op: O) -> Result<T, F>

### Description
Calls `op` if the result is `Err`, otherwise returns the `Ok` value of `self`. This function is lazily evaluated and useful for control flow based on result values.

### Parameters
- **op** (FnOnce(E) -> Result<T, F>) - Required - The closure to execute if the result is Err.
```

--------------------------------

### Base32 Struct Definition

Source: https://docs.rs/base32ct/0.3.1/base32ct/struct.Base32.html

The primary struct definition for the Base32 encoder/decoder.

```rust
pub struct Base32;
```

--------------------------------

### Compute default value with unwrap_or_else

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Returns the contained Ok value or computes a default value using a closure if the result is Err.

```rust
fn count(x: &str) -> usize { x.len() }
```

--------------------------------

### Test Padded Base32 Encoded Length

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=u32+-%3E+bool

Verifies that the padded encoded length includes the padding length in addition to the data groups.

```rust
#[test]
    fn padded_encoded_len() {
        let mut buf = vec![];
        assert_eq!(Base32::encoded_len(&buf), 0);

        for _ in 0..10 {
            buf.push(b'a');
            let LenData {
                forty_bit_groups_len,
                last_group_len,
                padding_len,
            } = get_len_data(buf.len());

            assert_eq!(
                Base32::encoded_len(&buf),
                forty_bit_groups_len + last_group_len + padding_len,
            );
        }
    }
```

--------------------------------

### Encoding Trait Methods

Source: https://docs.rs/base32ct/0.3.1/base32ct/trait.Encoding.html?search=u32+-%3E+bool

Methods provided by the Encoding trait for Base32 data transformation.

```APIDOC
## fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8]>

### Description
Decodes a Base32-encoded string into the provided output buffer.

## fn decode_vec(input: &str) -> Result<Vec<u8>>

### Description
Decodes a Base32 string into a byte vector. Requires the `alloc` feature.

## fn encode<'a>(src: &[u8], dst: &'a mut [u8]) -> Result<&'a str>

### Description
Encodes the input byte slice as Base32 into the provided destination slice, returning the resulting ASCII-encoded string slice.

## fn encode_string(input: &[u8]) -> String

### Description
Encodes an input byte slice into a String containing Base32. Requires the `alloc` feature.

## fn encoded_len(bytes: &[u8]) -> usize

### Description
Calculates the length of the Base32 output produced by encoding the given bytes.
```

--------------------------------

### Test Helper for Length Calculation

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Helper function used in tests to calculate length data for Base32 groups.

```rust
fn get_len_data(data_len: usize) -> LenData {
    // More information about the calculation can be found at
    // https://www.rfc-editor.org/rfc/rfc4648#section-6
    let forty_bit_groups_len = data_len / 5 * 8;
    let (last_group_len, padding_len) = match data_len % 5 {
        0 => (0, 0),
```

--------------------------------

### Test Unpadded Base32 Encoded Length

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=u32+-%3E+bool

Verifies that the unpadded encoded length matches the sum of forty-bit groups and the last group length.

```rust
#[test]
    fn unpadded_encoded_len() {
        let mut buf = vec![];
        assert_eq!(Base32Unpadded::encoded_len(&buf), 0);

        for _ in 0..10 {
            buf.push(b'a');
            let LenData {
                forty_bit_groups_len,
                last_group_len,
                padding_len: _,
            } = get_len_data(buf.len());

            assert_eq!(
                Base32Unpadded::encoded_len(&buf),
                forty_bit_groups_len + last_group_len
            );
        }
    }
```

--------------------------------

### Chain Results with And Then

Source: https://docs.rs/base32ct/0.3.1/base32ct/type.Result.html?search=u32+-%3E+bool

Calls a function if the result is Ok, allowing for lazy evaluation and control flow.

```rust
fn sq_then_to_string(x: u32) -> Result<String, &'static str> {
    x.checked_mul(x).map(|sq| sq.to_string()).ok_or("overflowed")
}
```

--------------------------------

### Test Base32 Encoded Length Calculations

Source: https://docs.rs/base32ct/0.3.1/src/base32ct/encoding.rs.html?search=

Unit tests verifying that encoded length matches the sum of forty-bit groups, last group length, and padding for both padded and unpadded variants.

```rust
    #[test]
    fn unpadded_encoded_len() {
        let mut buf = vec![];
        assert_eq!(Base32Unpadded::encoded_len(&buf), 0);

        for _ in 0..10 {
            buf.push(b'a');
            let LenData {
                forty_bit_groups_len,
                last_group_len,
                padding_len: _,
            } = get_len_data(buf.len());

            assert_eq!(
                Base32Unpadded::encoded_len(&buf),
                forty_bit_groups_len + last_group_len
            );
        }
    }
```

```rust
    #[test]
    fn padded_encoded_len() {
        let mut buf = vec![];
        assert_eq!(Base32::encoded_len(&buf), 0);

        for _ in 0..10 {
            buf.push(b'a');
            let LenData {
                forty_bit_groups_len,
                last_group_len,
                padding_len,
            } = get_len_data(buf.len());

            assert_eq!(
                Base32::encoded_len(&buf),
                forty_bit_groups_len + last_group_len + padding_len,
            );
        }
    }
```