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1 /* This Source Code Form is subject to the terms of the Mozilla Public
2  * License, v. 2.0. If a copy of the MPL was not distributed with this
3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4 
5 // Copied from uniffi_core/src/metadata.rs
6 // Due to a [Rust bug](https://github.com/rust-lang/rust/issues/113104) we don't want to pull in
7 // `uniffi_core`.
8 // This is the easy way out of that issue and is a temporary hacky solution.
9 
10 /// Metadata constants, make sure to keep this in sync with copy in `uniffi_core::metadata`
11 pub mod codes {
12     // Top-level metadata item codes
13     pub const FUNC: u8 = 0;
14     pub const METHOD: u8 = 1;
15     pub const RECORD: u8 = 2;
16     pub const ENUM: u8 = 3;
17     pub const INTERFACE: u8 = 4;
18     pub const NAMESPACE: u8 = 6;
19     pub const CONSTRUCTOR: u8 = 7;
20     pub const UDL_FILE: u8 = 8;
21     pub const CALLBACK_INTERFACE: u8 = 9;
22     pub const TRAIT_METHOD: u8 = 10;
23     pub const UNIFFI_TRAIT: u8 = 11;
24     pub const TRAIT_INTERFACE: u8 = 12;
25     pub const CALLBACK_TRAIT_INTERFACE: u8 = 13;
26     //pub const UNKNOWN: u8 = 255;
27 
28     // Type codes
29     pub const TYPE_U8: u8 = 0;
30     pub const TYPE_U16: u8 = 1;
31     pub const TYPE_U32: u8 = 2;
32     pub const TYPE_U64: u8 = 3;
33     pub const TYPE_I8: u8 = 4;
34     pub const TYPE_I16: u8 = 5;
35     pub const TYPE_I32: u8 = 6;
36     pub const TYPE_I64: u8 = 7;
37     pub const TYPE_F32: u8 = 8;
38     pub const TYPE_F64: u8 = 9;
39     pub const TYPE_BOOL: u8 = 10;
40     pub const TYPE_STRING: u8 = 11;
41     pub const TYPE_OPTION: u8 = 12;
42     pub const TYPE_RECORD: u8 = 13;
43     pub const TYPE_ENUM: u8 = 14;
44     // 15 no longer used.
45     pub const TYPE_INTERFACE: u8 = 16;
46     pub const TYPE_VEC: u8 = 17;
47     pub const TYPE_HASH_MAP: u8 = 18;
48     pub const TYPE_SYSTEM_TIME: u8 = 19;
49     pub const TYPE_DURATION: u8 = 20;
50     pub const TYPE_CALLBACK_INTERFACE: u8 = 21;
51     pub const TYPE_CUSTOM: u8 = 22;
52     pub const TYPE_RESULT: u8 = 23;
53     pub const TYPE_TRAIT_INTERFACE: u8 = 24;
54     pub const TYPE_CALLBACK_TRAIT_INTERFACE: u8 = 25;
55     pub const TYPE_UNIT: u8 = 255;
56 
57     // Literal codes
58     pub const LIT_STR: u8 = 0;
59     pub const LIT_INT: u8 = 1;
60     pub const LIT_FLOAT: u8 = 2;
61     pub const LIT_BOOL: u8 = 3;
62     pub const LIT_NONE: u8 = 4;
63     pub const LIT_SOME: u8 = 5;
64     pub const LIT_EMPTY_SEQ: u8 = 6;
65 }
66 
67 // Create a checksum for a MetadataBuffer
68 //
69 // This is used by the bindings code to verify that the library they link to is the same one
70 // that the bindings were generated from.
checksum_metadata(buf: &[u8]) -> u1671 pub const fn checksum_metadata(buf: &[u8]) -> u16 {
72     calc_checksum(buf, buf.len())
73 }
74 
calc_checksum(bytes: &[u8], size: usize) -> u1675 const fn calc_checksum(bytes: &[u8], size: usize) -> u16 {
76     // Taken from the fnv_hash() function from the FNV crate (https://github.com/servo/rust-fnv/blob/master/lib.rs).
77     // fnv_hash() hasn't been released in a version yet.
78     const INITIAL_STATE: u64 = 0xcbf29ce484222325;
79     const PRIME: u64 = 0x100000001b3;
80 
81     let mut hash = INITIAL_STATE;
82     let mut i = 0;
83     while i < size {
84         hash ^= bytes[i] as u64;
85         hash = hash.wrapping_mul(PRIME);
86         i += 1;
87     }
88     // Convert the 64-bit hash to a 16-bit hash by XORing everything together
89     (hash ^ (hash >> 16) ^ (hash >> 32) ^ (hash >> 48)) as u16
90 }
91