Add Puffin FileMetadata

crates/puffin/Cargo.toml

@@ -29,8 +29,13 @@ license = { workspace = true }
 keywords = ["iceberg", "puffin"]
 
 [dependencies]
+bytes = { workspace = true }
 iceberg = { workspace = true }
+once_cell = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
 zstd = { workspace = true }
 
 [dev-dependencies]
+tempfile = { workspace = true }
 tokio = { workspace = true }

crates/puffin/src/compression.rs

@@ -16,8 +16,11 @@
 // under the License.
 
 use iceberg::{Error, ErrorKind, Result};
+use serde::{Deserialize, Serialize};
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy, Default)]
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone, Copy)]
+#[serde(rename_all = "lowercase")]
+#[derive(Default)]
 /// Data compression formats
 pub enum CompressionCodec {
     #[default]

crates/puffin/src/lib.rs

@@ -23,3 +23,8 @@
 
 mod compression;
 pub use compression::CompressionCodec;
+
+mod metadata;
+
+#[cfg(test)]
+mod test_utils;