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]) -> u1671pub const fn checksum_metadata(buf: &[u8]) -> u16 { 72 calc_checksum(buf, buf.len()) 73 } 74 calc_checksum(bytes: &[u8], size: usize) -> u1675const 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