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calculate MAX_LENGTH_VALUE for 32-bit and 64-bit targets

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This commit is contained in:
Matt Garnett 2019-06-25 10:12:49 -04:00
parent db9dd3dffe
commit e93fb94e7a
1 changed files with 4 additions and 3 deletions
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7
eth2/utils/ssz/src/lib.rs
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@ -46,9 +46,10 @@ pub use encode::{Encode, SszEncoder};
/// The number of bytes used to represent an offset.
pub const BYTES_PER_LENGTH_OFFSET: usize = 4;
/// The maximum value that can be represented using `BYTES_PER_LENGTH_OFFSET`.
// allows overflow on 32-bit target
#[allow(const_err)]
pub const MAX_LENGTH_VALUE: usize = (1 << (BYTES_PER_LENGTH_OFFSET * 8)) - 1;
#[cfg(target_pointer_width = "32")]
pub const MAX_LENGTH_VALUE: usize = (std::u32::MAX >> 8 * (4 - BYTES_PER_LENGTH_OFFSET)) as usize;
#[cfg(target_pointer_width = "64")]
pub const MAX_LENGTH_VALUE: usize = (std::u64::MAX >> 8 * (8 - BYTES_PER_LENGTH_OFFSET)) as usize;
/// Convenience function to SSZ encode an object supporting ssz::Encode.
///