scovich commented on code in PR #7535: URL: https://github.com/apache/arrow-rs/pull/7535#discussion_r2104449497
########## parquet-variant/src/utils.rs: ########## @@ -0,0 +1,42 @@ +use std::{array::TryFromSliceError, ops::Range}; + +use arrow_schema::ArrowError; + +#[inline] +pub(crate) fn slice_from_slice(bytes: &[u8], range: Range<usize>) -> Result<&[u8], ArrowError> { + bytes.get(range.clone()).ok_or_else(|| { + ArrowError::InvalidArgumentError(format!( + "Tried to extract {} bytes at offset {} from {}-byte buffer", + range.end - range.start, + range.start, + bytes.len(), + )) + }) +} +pub(crate) fn array_from_slice<const N: usize>( + bytes: &[u8], + offset: usize, +) -> Result<[u8; N], ArrowError> { + let bytes = slice_from_slice(bytes, offset..offset + N)?; + bytes.try_into().map_err(map_try_from_slice_error) +} + +/// To be used in `map_err` when unpacking an integer from a slice of bytes. +pub(crate) fn map_try_from_slice_error(e: TryFromSliceError) -> ArrowError { + ArrowError::InvalidArgumentError(e.to_string()) +} + +pub(crate) fn non_empty_slice(slice: &[u8]) -> Result<&[u8], ArrowError> { + if slice.is_empty() { + return Err(ArrowError::InvalidArgumentError( + "Received empty bytes".to_string(), + )); + } else { + return Ok(slice); + } Review Comment: Could also just add `.map(Copy::copy)` to the chain to make callers' lives easier? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org