Method get_contents_ext

atomic-core/src/change/store.rs:483–521

(
        &self,
        node: GraphNode<Option<Hash>>,
        buf: &mut [u8],
    )

    }

    fn get_contents_ext(
        &self,
        node: GraphNode<Option<Hash>>,
        buf: &mut [u8],
    ) -> Result<usize, Self::Error> {
        // Handle empty vertices or no hash
        if node.end <= node.start {
            return Ok(0);
        }

        let hash = match node.change {
            Some(h) => h,
            None => return Ok(0),
        };

        // Load the change
        let changes = self.changes.read().unwrap();
        let change = changes
            .get(&hash)
            .ok_or_else(|| MemoryStoreError::NotFound(hash.to_base32()))?;

        // Extract the content range
        let start = node.start.0.as_u64() as usize;
        let end = node.end.0.as_u64() as usize;

        if end > change.contents.len() {
            return Err(MemoryStoreError::OutOfBounds {
                start: start as u64,
                end: end as u64,
                len: change.contents.len(),
            });
        }

        let content = &change.contents[start..end];
        let len = content.len().min(buf.len());
        buf[..len].copy_from_slice(&content[..len]);

        Ok(len)
    }
}

// TESTS