1 files changed, 39 insertions, 0 deletions
diff --git a/src/hash.rs b/src/hash.rs
new file mode 100644
index 0000000..0e9ba6d
--- /dev/null
+++ b/src/hash.rs
@@ -0,0 +1,39 @@
+use std::{
+    collections::hash_map::DefaultHasher,
+    hash::{Hash, Hasher},
+};
+
+/// Hashes the string literal `s` to a `u64` using the Rust's [`default hasher`](DefaultHasher) (i.e. one used in the [`HashMap`](std::collections::HashMap)).
+pub fn str_hash_default(s: &str) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    s.hash(&mut hasher);
+    hasher.finish()
+}
+
+/// Hashes the string literal `s` to a `u32` using the FNV1a (32b) hash.
+pub fn str_hash_fnv1a(s: &str) -> u32 {
+    const FNV1A32_PRIME: u32 = 0x0100_0193;
+    const FNV1A32_SEED: u32 = 0x811C_9DC5;
+
+    let mut hash = FNV1A32_SEED;
+
+    for byte in s.as_bytes() {
+        hash = (hash ^ *byte as u32).wrapping_mul(FNV1A32_PRIME);
+    }
+
+    hash
+}
+
+/// Hashes the string literal `s` to a `u64` using the FNV1a (64b) hash.
+pub fn str_hash_fnv1a_64(s: &str) -> u64 {
+    const FNV1A64_PRIME: u64 = 0x0000_0100_0000_01B3;
+    const FNV1A64_SEED: u64 = 0xcbf2_9ce4_8422_2325;
+
+    let mut hash = FNV1A64_SEED;
+
+    for byte in s.as_bytes() {
+        hash = (hash ^ *byte as u64).wrapping_mul(FNV1A64_PRIME);
+    }
+
+    hash
+}