1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
//! Macros for data-encoding
//!
//! This library provides macros to define compile-time byte arrays from encoded strings (using
//! common bases like [base64], [base32], or [hexadecimal], and also custom bases). It also provides
//! a macro to define compile-time custom encodings to be used with the [data-encoding] crate at
//! run-time.
//!
//! Up to Rust 1.50, you may need to add the following to your `.cargo/config.toml` to use this
//! library in no-std or no-alloc environments:
//!
//! ```toml
//! [unstable]
//! features = ["host_dep"]
//! ```
//!
//! From Rust 1.51, you may need to add the following to your `Cargo.toml`:
//!
//! ```toml
//! [package]
//! resolver = "2"
//! ```
//!
//! # Examples
//!
//! You can define a compile-time byte slice from an encoded string literal:
//!
//! ```rust
//! const HELLO_SLICE: &'static [u8] = &data_encoding_macro::hexlower!("68656c6c6f");
//! const FOOBAR_SLICE: &'static [u8] = &data_encoding_macro::base64!("Zm9vYmFy");
//! # fn main() {}
//! ```
//!
//! You can also define a compile-time byte array from an encoded string literal:
//!
//! ```rust
//! data_encoding_macro::hexlower_array!("const HELLO" = "68656c6c6f");
//! data_encoding_macro::base64_array!("const FOOBAR" = "Zm9vYmFy");
//! # fn main() {}
//! ```
//!
//! You can define a compile-time custom encoding from its specification:
//!
//! ```rust
//! const HEX: data_encoding::Encoding = data_encoding_macro::new_encoding! {
//!     symbols: "0123456789abcdef",
//!     translate_from: "ABCDEF",
//!     translate_to: "abcdef",
//! };
//! const BASE64: data_encoding::Encoding = data_encoding_macro::new_encoding! {
//!     symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
//!     padding: '=',
//! };
//! # fn main() {}
//! ```
//!
//! [base32]: macro.base32.html
//! [base64]: macro.base64.html
//! [data-encoding]: https://crates.io/crates/data-encoding
//! [hexadecimal]: macro.hexlower_permissive.html

#![no_std]
#![warn(unused_results)]

#[doc(hidden)]
pub use data_encoding_macro_internal::{
    internal_decode_array, internal_decode_slice, internal_new_encoding,
};

/// Defines a compile-time byte array by decoding a string literal
///
/// This macro takes a list of `key: value,` pairs (the last comma is required). It takes the
/// key-value pairs specifying the encoding to use to decode the input (see [new_encoding] for the
/// possible key-value pairs), the input itself keyed by `input`, and the output keyed by `name`.
/// The output must be of the form `[pub] {const|static} <name>`.
///
/// # Examples
///
/// ```rust
/// data_encoding_macro::decode_array! {
///     name: "const OCTAL",
///     symbols: "01234567",
///     padding: '=',
///     input: "237610==",
/// }
/// # fn main() {}
/// ```
///
/// [new_encoding]: macro.new_encoding.html
#[macro_export]
macro_rules! decode_array {
    ($($arg: tt)*) => {
        $crate::internal_decode_array!($($arg)*);
    };
}

/// Defines a compile-time byte slice by decoding a string literal
///
/// This macro takes a list of `key: value,` pairs (the last comma is required). It takes the
/// key-value pairs specifying the encoding to use to decode the input (see [new_encoding] for the
/// possible key-value pairs), the input itself keyed by `input`, and the output keyed by `name`.
///
/// # Examples
///
/// ```rust
/// const OCTAL: &'static [u8] = &data_encoding_macro::decode_slice! {
///     symbols: "01234567",
///     padding: '=',
///     input: "237610==",
/// };
/// # fn main() {}
/// ```
///
/// [new_encoding]: macro.new_encoding.html
#[macro_export]
macro_rules! decode_slice {
    ($($arg: tt)*) => {
        $crate::internal_decode_slice!($($arg)*)
    };
}

/// Defines a compile-time custom encoding
///
/// This macro takes a list of `key: value,` pairs (the last comma is required). The possible
/// key-value pairs are:
///
/// ```text
///             symbols: <string>,       // e.g. "01234567"
///             padding: [None]|<char>,  // e.g. '='
///           bit_order: [MostSignificantFirst]|LeastSignificantFirst,
/// check_trailing_bits: [true]|false,
///              ignore: [""]|<string>,  // e.g. " \t\n"
///          wrap_width: [0]|<int>,      // e.g. 76
///      wrap_separator: [""]|<string>,  // e.g. "\r\n"
///      translate_from: [""]|<string>,  // e.g. "ABCDEF"
///        translate_to: [""]|<string>,  // e.g. "abcdef"
/// ```
///
/// Only `symbols` is required. Everything else is optional and defaults to the value between square
/// brackets.
///
/// # Examples
///
/// ```rust
/// const HEX: data_encoding::Encoding = data_encoding_macro::new_encoding! {
///     symbols: "0123456789abcdef",
///     ignore: " \r\t\n",
///     wrap_width: 32,
///     wrap_separator: "\n",
///     translate_from: "ABCDEF",
///     translate_to: "abcdef",
/// };
/// # fn main() {}
/// ```
#[macro_export]
macro_rules! new_encoding {
    ($($arg: tt)*) => {
        data_encoding::Encoding::internal_new(&$crate::internal_new_encoding!{ $($arg)* })
    };
}

macro_rules! make {
    ($base: ident $base_array: ident = $ref: ident; $($spec: tt)*) => {
        #[macro_export]
        macro_rules! $base_array {
            ($n: tt = $x: tt) => {
                $crate::decode_array!(name: $n, input: $x, $($spec)*);
            };
        }
        #[macro_export]
        macro_rules! $base {
            ($x: tt) => {
                $crate::decode_slice!(input: $x, $($spec)*)
            };
        }
        #[test]
        fn $base() {
            assert_eq!(new_encoding!($($spec)*), data_encoding::$ref);
        }
    };
}

make! {
    hexlower hexlower_array = HEXLOWER;
    symbols: "0123456789abcdef",
}
make! {
    hexlower_permissive hexlower_permissive_array = HEXLOWER_PERMISSIVE;
    symbols: "0123456789abcdef",
    translate_from: "ABCDEF",
    translate_to: "abcdef",
}
make! {
    hexupper hexupper_array = HEXUPPER;
    symbols: "0123456789ABCDEF",
}
make! {
    hexupper_permissive hexupper_permissive_array = HEXUPPER_PERMISSIVE;
    symbols: "0123456789ABCDEF",
    translate_from: "abcdef",
    translate_to: "ABCDEF",
}
make! {
    base32 base32_array = BASE32;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
    padding: '=',
}
make! {
    base32_nopad base32_nopad_array = BASE32_NOPAD;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
}
make! {
    base32hex base32hex_array = BASE32HEX;
    symbols: "0123456789ABCDEFGHIJKLMNOPQRSTUV",
    padding: '=',
}
make! {
    base32hex_nopad base32hex_nopad_array = BASE32HEX_NOPAD;
    symbols: "0123456789ABCDEFGHIJKLMNOPQRSTUV",
}
make! {
    base32_dnssec base32_dnssec_array = BASE32_DNSSEC;
    symbols: "0123456789abcdefghijklmnopqrstuv",
    translate_from: "ABCDEFGHIJKLMNOPQRSTUV",
    translate_to: "abcdefghijklmnopqrstuv",
}
make! {
    base32_dnscurve base32_dnscurve_array = BASE32_DNSCURVE;
    symbols: "0123456789bcdfghjklmnpqrstuvwxyz",
    bit_order: LeastSignificantFirst,
    translate_from: "BCDFGHJKLMNPQRSTUVWXYZ",
    translate_to: "bcdfghjklmnpqrstuvwxyz",
}
make! {
    base64 base64_array = BASE64;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
    padding: '=',
}
make! {
    base64_nopad base64_nopad_array = BASE64_NOPAD;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
}
make! {
    base64_mime base64_mime_array = BASE64_MIME;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
    padding: '=',
    wrap_width: 76,
    wrap_separator: "\r\n",
}
make! {
    base64_mime_permissive base64_mime_permissive_array = BASE64_MIME_PERMISSIVE;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
    padding: '=',
    wrap_width: 76,
    wrap_separator: "\r\n",
    check_trailing_bits: false,
}
make! {
    base64url base64url_array = BASE64URL;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",
    padding: '=',
}
make! {
    base64url_nopad base64url_nopad_array = BASE64URL_NOPAD;
    symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",
}