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Add comment regarding avoiding panics

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andrews05 2024-03-29 09:00:03 +13:00 committed by GitHub
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src/png/scan_lines.rs
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@ -27,6 +27,8 @@ impl<'a> Iterator for ScanLines<'a> {
let (len, pass, num_pixels) = self.iter.next()?; let (len, pass, num_pixels) = self.iter.next()?;
debug_assert!(self.raw_data.len() >= len); debug_assert!(self.raw_data.len() >= len);
debug_assert!(!self.has_filter || len > 1); debug_assert!(!self.has_filter || len > 1);
// The data length should always be correct here but this check assures
// the compiler that it doesn't need to account for a potential panic
if self.raw_data.len() < len { if self.raw_data.len() < len {
return None; return None;
} }