29 lines
711 B
Rust
29 lines
711 B
Rust
use crate::Result;
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#[inline]
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#[must_use]
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pub fn increment(old: Option<&[u8]>) -> [u8; 8] {
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old.map(TryInto::try_into)
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.map_or(0_u64, |val| val.map_or(0_u64, u64::from_be_bytes))
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.wrapping_add(1)
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.to_be_bytes()
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}
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/// Parses the big-endian bytes into an u64.
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#[inline]
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pub fn u64_from_bytes(bytes: &[u8]) -> Result<u64> {
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let array: [u8; 8] = bytes.try_into()?;
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Ok(u64_from_u8x8(array))
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}
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/// Parses the 8 big-endian bytes into an u64.
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#[inline]
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#[must_use]
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pub fn u64_from_u8(bytes: &[u8]) -> u64 {
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let bytes: &[u8; 8] = bytes.try_into().expect("must slice at least 8 bytes");
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u64_from_u8x8(*bytes)
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}
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#[inline]
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#[must_use]
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pub fn u64_from_u8x8(bytes: [u8; 8]) -> u64 { u64::from_be_bytes(bytes) }
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