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hash.fnv1a: add generic fnv1a.sum64_struct/1 and fnv1a.sum32_struct/1 + tests

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Delyan Angelov
2021-12-29 12:03:24 +02:00
parent 7c78bf9466
commit 69c90ef50d
2 changed files with 62 additions and 0 deletions
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24
vlib/hash/fnv1a/fnv1a.v
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@@ -31,6 +31,18 @@ pub fn sum32(data []byte) u32 {
return hash
}
// sum32_bytes returns a fnv1a hash of the struct `s`.
[direct_array_access; inline]
pub fn sum32_struct<T>(s &T) u32 {
bp := unsafe { &byte(s) }
sz := int(sizeof(T))
mut hash := fnv1a.fnv32_offset_basis
for i in 0 .. sz {
hash = unsafe { (hash ^ u32(bp[i])) * fnv1a.fnv32_prime }
}
return hash
}
// sum32_bytes returns a fnv1a hash of `data_len` bytes starting at
// the address in the given &byte pointer `data`.
[direct_array_access; inline; unsafe]
@@ -73,3 +85,15 @@ pub fn sum64_bytes(data &byte, data_len int) u64 {
}
return hash
}
// sum64_bytes returns a fnv1a hash of the struct `s`.
[direct_array_access; inline]
pub fn sum64_struct<T>(s &T) u64 {
bp := unsafe { &byte(s) }
sz := int(sizeof(T))
mut hash := fnv1a.fnv64_offset_basis
for i in 0 .. sz {
hash = unsafe { (hash ^ u64(bp[i])) * fnv1a.fnv64_prime }
}
return hash
}