add changelog and missing file

veilid-core/src/veilid_api/serialize_helpers/compression.rs

@@ -0,0 +1,25 @@
+use super::*;
+use lz4_flex::block;
+
+use crate::apibail_generic;
+
+pub fn compress_prepend_size(input: &[u8]) -> Vec<u8> {
+    block::compress_prepend_size(input)
+}
+
+pub fn decompress_size_prepended(
+    input: &[u8],
+    max_size: Option<usize>,
+) -> VeilidAPIResult<Vec<u8>> {
+    let (uncompressed_size, input) =
+        block::uncompressed_size(input).map_err(VeilidAPIError::generic)?;
+    if let Some(max_size) = max_size {
+        if uncompressed_size > max_size {
+            apibail_generic!(format!(
+                "decompression exceeded maximum size: {} > {}",
+                uncompressed_size, max_size
+            ));
+        }
+    }
+    Ok(block::decompress(input, uncompressed_size).map_err(VeilidAPIError::generic)?)
+}