Add "Encode and decode base32" example

Author: ia0

src/encoding.md

@@ -6,6 +6,7 @@
 | [Encode a string as application/x-www-form-urlencoded][ex-urlencoded] | [![url-badge]][url] | [![cat-encoding-badge]][cat-encoding] |
 | [Encode and decode hex][ex-hex-encode-decode] | [![data-encoding-badge]][data-encoding] | [![cat-encoding-badge]][cat-encoding] |
 | [Encode and decode base64][ex-base64] | [![base64-badge]][base64] | [![cat-encoding-badge]][cat-encoding] |
+| [Encode and decode base32][ex-base32] | [![data-encoding-badge]][data-encoding] | [![cat-encoding-badge]][cat-encoding] |
 | [Read CSV records][ex-csv-read] | [![csv-badge]][csv] | [![cat-encoding-badge]][cat-encoding] |
 | [Read CSV records with different delimiter][ex-csv-delimiter] | [![csv-badge]][csv] | [![cat-encoding-badge]][cat-encoding] |
 | [Filter CSV records matching a predicate][ex-csv-filter] | [![csv-badge]][csv] | [![cat-encoding-badge]][cat-encoding] |
@@ -21,6 +22,7 @@
 [ex-urlencoded]: encoding/strings.html#encode-a-string-as-applicationx-www-form-urlencoded
 [ex-hex-encode-decode]: encoding/strings.html#encode-and-decode-hex
 [ex-base64]: encoding/strings.html#encode-and-decode-base64
+[ex-base32]: encoding/strings.html#encode-and-decode-base32
 [ex-csv-read]: encoding/csv.html#read-csv-records
 [ex-csv-delimiter]: encoding/csv.html#read-csv-records-with-different-delimiter
 [ex-csv-filter]: encoding/csv.html#filter-csv-records-matching-a-predicate

src/encoding/string/base32.md

@@ -0,0 +1,31 @@
+## Encode and decode base32
+
+[![data-encoding-badge]][data-encoding] [![cat-encoding-badge]][cat-encoding]
+
+The [`data_encoding`] crate provides a `BASE32::encode` method which takes a
+`&[u8]` and returns a `String` containing the base32 representation of the data.
+
+Similarly, a `BASE32::decode` method is provided which takes a `&[u8]` and
+returns a `Vec<u8>` if the input data is successfully decoded.
+
+The example below coverts `&[u8]` data to base32 equivalent and compares this
+value to the expected value.
+
+```rust,edition2018
+use data_encoding::{BASE32, DecodeError};
+
+fn main() -> Result<(), DecodeError> {
+    let original = b"Cooking with Rust";
+    let expected = "INXW623JNZTSA53JORUCAUTVON2A====";
+
+    let encoded = BASE32.encode(original);
+    assert_eq!(encoded, expected);
+
+    let decoded = BASE32.decode(encoded.as_bytes())?;
+    assert_eq!(&decoded[..], &original[..]);
+
+    Ok(())
+}
+```
+
+[`data_encoding`]: https://docs.rs/data-encoding/*/data_encoding/

src/encoding/strings.md

@@ -8,4 +8,6 @@
 
 {{#include string/base64.md}}
 
+{{#include string/base32.md}}
+
 {{#include ../links.md}}