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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_meta::reader` |
| 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 ERROR: u8 = 5; |
| 19 | + pub const NAMESPACE: u8 = 6; |
| 20 | + pub const CONSTRUCTOR: u8 = 7; |
| 21 | + pub const UDL_FILE: u8 = 8; |
| 22 | + pub const CALLBACK_INTERFACE: u8 = 9; |
| 23 | + pub const TRAIT_METHOD: u8 = 10; |
| 24 | + //pub const UNKNOWN: u8 = 255; |
| 25 | + |
| 26 | + // Type codes |
| 27 | + pub const TYPE_U8: u8 = 0; |
| 28 | + pub const TYPE_U16: u8 = 1; |
| 29 | + pub const TYPE_U32: u8 = 2; |
| 30 | + pub const TYPE_U64: u8 = 3; |
| 31 | + pub const TYPE_I8: u8 = 4; |
| 32 | + pub const TYPE_I16: u8 = 5; |
| 33 | + pub const TYPE_I32: u8 = 6; |
| 34 | + pub const TYPE_I64: u8 = 7; |
| 35 | + pub const TYPE_F32: u8 = 8; |
| 36 | + pub const TYPE_F64: u8 = 9; |
| 37 | + pub const TYPE_BOOL: u8 = 10; |
| 38 | + pub const TYPE_STRING: u8 = 11; |
| 39 | + pub const TYPE_OPTION: u8 = 12; |
| 40 | + pub const TYPE_RECORD: u8 = 13; |
| 41 | + pub const TYPE_ENUM: u8 = 14; |
| 42 | + // 15 no longer used. |
| 43 | + pub const TYPE_INTERFACE: u8 = 16; |
| 44 | + pub const TYPE_VEC: u8 = 17; |
| 45 | + pub const TYPE_HASH_MAP: u8 = 18; |
| 46 | + pub const TYPE_SYSTEM_TIME: u8 = 19; |
| 47 | + pub const TYPE_DURATION: u8 = 20; |
| 48 | + pub const TYPE_CALLBACK_INTERFACE: u8 = 21; |
| 49 | + pub const TYPE_CUSTOM: u8 = 22; |
| 50 | + pub const TYPE_RESULT: u8 = 23; |
| 51 | + //pub const TYPE_FUTURE: u8 = 24; |
| 52 | + pub const TYPE_FOREIGN_EXECUTOR: u8 = 25; |
| 53 | + pub const TYPE_UNIT: u8 = 255; |
| 54 | + |
| 55 | + // Literal codes |
| 56 | + pub const LIT_STR: u8 = 0; |
| 57 | + pub const LIT_INT: u8 = 1; |
| 58 | + pub const LIT_FLOAT: u8 = 2; |
| 59 | + pub const LIT_BOOL: u8 = 3; |
| 60 | + pub const LIT_NULL: u8 = 4; |
| 61 | +} |
| 62 | + |
| 63 | +// Create a checksum for a MetadataBuffer |
| 64 | +// |
| 65 | +// This is used by the bindings code to verify that the library they link to is the same one |
| 66 | +// that the bindings were generated from. |
| 67 | +pub const fn checksum_metadata(buf: &[u8]) -> u16 { |
| 68 | + calc_checksum(buf, buf.len()) |
| 69 | +} |
| 70 | + |
| 71 | +const fn calc_checksum(bytes: &[u8], size: usize) -> u16 { |
| 72 | + // Taken from the fnv_hash() function from the FNV crate (https://github.com/servo/rust-fnv/blob/master/lib.rs). |
| 73 | + // fnv_hash() hasn't been released in a version yet. |
| 74 | + const INITIAL_STATE: u64 = 0xcbf29ce484222325; |
| 75 | + const PRIME: u64 = 0x100000001b3; |
| 76 | + |
| 77 | + let mut hash = INITIAL_STATE; |
| 78 | + let mut i = 0; |
| 79 | + while i < size { |
| 80 | + hash ^= bytes[i] as u64; |
| 81 | + hash = hash.wrapping_mul(PRIME); |
| 82 | + i += 1; |
| 83 | + } |
| 84 | + // Convert the 64-bit hash to a 16-bit hash by XORing everything together |
| 85 | + (hash ^ (hash >> 16) ^ (hash >> 32) ^ (hash >> 48)) as u16 |
| 86 | +} |
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