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Implement a JUCE-compatible Rabin fingerprint

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This commit is contained in:
Robbert van der Helm 2022-01-26 23:35:01 +01:00
parent 22be850d9e
commit 186a924104
1 changed files with 16 additions and 0 deletions
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16
src/wrapper/util.rs
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@ -19,6 +19,22 @@ use std::os::raw::c_char;
use vst3_sys::vst::TChar;
use widestring::U16CString;
/// A Rabin fingerprint based string hash compatible with JUCE's implementation.
///
/// https://github.com/juce-framework/JUCE/blob/0abbba3b18c3263137eeaeaa11c917a3425ce585/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp#L585-L601
/// https://github.com/juce-framework/JUCE/blob/46ea879739533ca0cdc689b967edfc5390c46ef7/modules/juce_core/text/juce_String.cpp#L541-L556
pub fn hash_param_id(id: &str) -> u32 {
let mut hash: u32 = 0;
for char in id.bytes() {
hash = hash * 31 + char as u32
}
// Studio One apparently doesn't like negative parameters, so JUCE just zeroes out the sign bit
hash &= !(1 << 31);
hash
}
/// The equivalent of the `strlcpy()` C function. Copy `src` to `dest` as a null-terminated
/// C-string. If `dest` does not have enough capacity, add a null terminator at the end to prevent
/// buffer overflows.