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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| //! The `fletcher32` bytes to bytes codec. | ||
| //! | ||
| //! Appends a fletcher32 checksum of the input bytestream. | ||
| //! | ||
| //! See <https://numcodecs.readthedocs.io/en/latest/checksum32.html#fletcher32>. | ||
| mod fletcher32_codec; | ||
|
|
||
| use std::sync::Arc; | ||
|
|
||
| pub use crate::metadata::v3::array::codec::fletcher32::{ | ||
| Fletcher32CodecConfiguration, Fletcher32CodecConfigurationV1, | ||
| }; | ||
| pub use fletcher32_codec::Fletcher32Codec; | ||
|
|
||
| use crate::{ | ||
| array::codec::{Codec, CodecPlugin}, | ||
| metadata::v3::{array::codec::fletcher32, MetadataV3}, | ||
| plugin::{PluginCreateError, PluginMetadataInvalidError}, | ||
| }; | ||
|
|
||
| pub use fletcher32::IDENTIFIER; | ||
|
|
||
| // Register the codec. | ||
| inventory::submit! { | ||
| CodecPlugin::new(IDENTIFIER, is_name_fletcher32, create_codec_fletcher32) | ||
| } | ||
|
|
||
| fn is_name_fletcher32(name: &str) -> bool { | ||
| name.eq(IDENTIFIER) | ||
| } | ||
|
|
||
| pub(crate) fn create_codec_fletcher32(metadata: &MetadataV3) -> Result<Codec, PluginCreateError> { | ||
| let configuration = metadata | ||
| .to_configuration() | ||
| .map_err(|_| PluginMetadataInvalidError::new(IDENTIFIER, "codec", metadata.clone()))?; | ||
| let codec = Arc::new(Fletcher32Codec::new_with_configuration(&configuration)); | ||
| Ok(Codec::BytesToBytes(codec)) | ||
| } | ||
|
|
||
| const CHECKSUM_SIZE: usize = core::mem::size_of::<u32>(); | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use std::{borrow::Cow, sync::Arc}; | ||
|
|
||
| use crate::{ | ||
| array::{ | ||
| codec::{BytesToBytesCodecTraits, CodecOptions, CodecTraits}, | ||
| BytesRepresentation, | ||
| }, | ||
| byte_range::ByteRange, | ||
| }; | ||
|
|
||
| use super::*; | ||
|
|
||
| const JSON1: &str = r#"{}"#; | ||
|
|
||
| #[test] | ||
| fn codec_fletcher32_configuration_none() { | ||
| let codec_configuration: Fletcher32CodecConfiguration = | ||
| serde_json::from_str(r#"{}"#).unwrap(); | ||
| let codec = Fletcher32Codec::new_with_configuration(&codec_configuration); | ||
| let metadata = codec.create_metadata().unwrap(); | ||
| assert_eq!( | ||
| serde_json::to_string(&metadata).unwrap(), | ||
| r#"{"name":"fletcher32"}"# | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn codec_fletcher32() { | ||
| let elements: Vec<u8> = (0..6).collect(); | ||
| let bytes = elements; | ||
| let bytes_representation = BytesRepresentation::FixedSize(bytes.len() as u64); | ||
|
|
||
| let codec_configuration: Fletcher32CodecConfiguration = | ||
| serde_json::from_str(JSON1).unwrap(); | ||
| let codec = Fletcher32Codec::new_with_configuration(&codec_configuration); | ||
|
|
||
| let encoded = codec | ||
| .encode(Cow::Borrowed(&bytes), &CodecOptions::default()) | ||
| .unwrap(); | ||
| let decoded = codec | ||
| .decode( | ||
| encoded.clone(), | ||
| &bytes_representation, | ||
| &CodecOptions::default(), | ||
| ) | ||
| .unwrap(); | ||
| assert_eq!(bytes, decoded.to_vec()); | ||
|
|
||
| // Check that the checksum is correct | ||
| let checksum: &[u8; 4] = &encoded | ||
| [encoded.len() - core::mem::size_of::<u32>()..encoded.len()] | ||
| .try_into() | ||
| .unwrap(); | ||
| println!("checksum {checksum:?}"); | ||
| assert_eq!(checksum, &[9, 6, 14, 8]); // TODO: CHECK | ||
| } | ||
|
|
||
| #[test] | ||
| fn codec_fletcher32_partial_decode() { | ||
| let elements: Vec<u8> = (0..32).collect(); | ||
| let bytes = elements; | ||
| let bytes_representation = BytesRepresentation::FixedSize(bytes.len() as u64); | ||
|
|
||
| let codec_configuration: Fletcher32CodecConfiguration = | ||
| serde_json::from_str(JSON1).unwrap(); | ||
| let codec = Arc::new(Fletcher32Codec::new_with_configuration( | ||
| &codec_configuration, | ||
| )); | ||
|
|
||
| let encoded = codec | ||
| .encode(Cow::Owned(bytes), &CodecOptions::default()) | ||
| .unwrap(); | ||
| let decoded_regions = [ByteRange::FromStart(3, Some(2))]; | ||
| let input_handle = Arc::new(std::io::Cursor::new(encoded)); | ||
| let partial_decoder = codec | ||
| .partial_decoder( | ||
| input_handle, | ||
| &bytes_representation, | ||
| &CodecOptions::default(), | ||
| ) | ||
| .unwrap(); | ||
| let decoded_partial_chunk = partial_decoder | ||
| .partial_decode(&decoded_regions, &CodecOptions::default()) | ||
| .unwrap() | ||
| .unwrap(); | ||
| let answer: &[Vec<u8>] = &[vec![3, 4]]; | ||
| assert_eq!( | ||
| answer, | ||
| decoded_partial_chunk | ||
| .into_iter() | ||
| .map(|v| v.to_vec()) | ||
| .collect::<Vec<_>>() | ||
| ); | ||
| } | ||
|
|
||
| #[cfg(feature = "async")] | ||
| #[tokio::test] | ||
| async fn codec_fletcher32_async_partial_decode() { | ||
| let elements: Vec<u8> = (0..32).collect(); | ||
| let bytes = elements; | ||
| let bytes_representation = BytesRepresentation::FixedSize(bytes.len() as u64); | ||
|
|
||
| let codec_configuration: Fletcher32CodecConfiguration = | ||
| serde_json::from_str(JSON1).unwrap(); | ||
| let codec = Arc::new(Fletcher32Codec::new_with_configuration( | ||
| &codec_configuration, | ||
| )); | ||
|
|
||
| let encoded = codec | ||
| .encode(Cow::Owned(bytes), &CodecOptions::default()) | ||
| .unwrap(); | ||
| let decoded_regions = [ByteRange::FromStart(3, Some(2))]; | ||
| let input_handle = Arc::new(std::io::Cursor::new(encoded)); | ||
| let partial_decoder = codec | ||
| .async_partial_decoder( | ||
| input_handle, | ||
| &bytes_representation, | ||
| &CodecOptions::default(), | ||
| ) | ||
| .await | ||
| .unwrap(); | ||
| let decoded_partial_chunk = partial_decoder | ||
| .partial_decode(&decoded_regions, &CodecOptions::default()) | ||
| .await | ||
| .unwrap() | ||
| .unwrap(); | ||
| let answer: &[Vec<u8>] = &[vec![3, 4]]; | ||
| assert_eq!( | ||
| answer, | ||
| decoded_partial_chunk | ||
| .into_iter() | ||
| .map(|v| v.to_vec()) | ||
| .collect::<Vec<_>>() | ||
| ); | ||
| } | ||
| } |
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