30 lines
873 B
Rust
30 lines
873 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_or(0_u64, u64_from_bytes_or_zero)
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.wrapping_add(1)
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.to_be_bytes()
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}
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/// Parses 8 big-endian bytes into an u64; panic on invalid argument
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#[inline]
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#[must_use]
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pub fn u64_from_u8(bytes: &[u8]) -> u64 { u64_from_bytes(bytes).expect("must slice at least 8 bytes") }
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/// Parses the 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_bytes_or_zero(bytes: &[u8]) -> u64 { u64_from_bytes(bytes).unwrap_or(0) }
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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> { Ok(u64_from_u8x8(*u8x8_from_bytes(bytes)?)) }
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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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#[inline]
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pub fn u8x8_from_bytes(bytes: &[u8]) -> Result<&[u8; 8]> { Ok(bytes.try_into()?) }
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