126 lines
3.1 KiB
Rust
126 lines
3.1 KiB
Rust
use hex::{FromHex, ToHex};
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use serde::de::{Error, Visitor};
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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///! Serializable wrapper around vector of bytes
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use std::{fmt, ops};
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use zebra_primitives::bytes::Bytes as GlobalBytes;
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/// Wrapper structure around vector of bytes.
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#[derive(Debug, PartialEq, Eq, Default, Hash, Clone)]
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pub struct Bytes(pub Vec<u8>);
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impl Bytes {
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/// Simple constructor.
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pub fn new(bytes: Vec<u8>) -> Bytes {
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Bytes(bytes)
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}
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/// Convert back to vector
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pub fn to_vec(self) -> Vec<u8> {
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self.0
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}
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}
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impl<T> From<T> for Bytes
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where
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GlobalBytes: From<T>,
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{
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fn from(other: T) -> Self {
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Bytes(GlobalBytes::from(other).take())
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}
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}
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impl Into<Vec<u8>> for Bytes {
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fn into(self) -> Vec<u8> {
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self.0
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}
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}
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impl Serialize for Bytes {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let mut serialized = String::new();
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serialized.push_str(self.0.to_hex::<String>().as_ref());
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serializer.serialize_str(serialized.as_ref())
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}
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}
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impl<'a> Deserialize<'a> for Bytes {
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fn deserialize<D>(deserializer: D) -> Result<Bytes, D::Error>
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where
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D: Deserializer<'a>,
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{
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deserializer.deserialize_identifier(BytesVisitor)
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}
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}
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struct BytesVisitor;
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impl<'a> Visitor<'a> for BytesVisitor {
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type Value = Bytes;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a bytes")
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}
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fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
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where
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E: Error,
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{
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if value.len() > 0 && value.len() & 1 == 0 {
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Ok(Bytes::new(try!(
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FromHex::from_hex(&value).map_err(|_| Error::custom("invalid hex"))
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)))
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} else {
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Err(Error::custom("invalid format"))
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}
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}
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fn visit_string<E>(self, value: String) -> Result<Self::Value, E>
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where
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E: Error,
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{
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self.visit_str(value.as_ref())
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}
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}
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impl ops::Deref for Bytes {
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type Target = Vec<u8>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use hex::FromHex;
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use serde_json;
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#[test]
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fn test_bytes_serialize() {
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let bytes = Bytes("0123456789abcdef".from_hex().unwrap());
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let serialized = serde_json::to_string(&bytes).unwrap();
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assert_eq!(serialized, r#""0123456789abcdef""#);
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}
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#[test]
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fn test_bytes_deserialize() {
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let bytes1: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""""#);
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let bytes2: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""123""#);
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let bytes3: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""gg""#);
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let bytes4: Bytes = serde_json::from_str(r#""12""#).unwrap();
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let bytes5: Bytes = serde_json::from_str(r#""0123""#).unwrap();
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assert!(bytes1.is_err());
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assert!(bytes2.is_err());
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assert!(bytes3.is_err());
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assert_eq!(bytes4, Bytes(vec![0x12]));
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assert_eq!(bytes5, Bytes(vec![0x1, 0x23]));
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}
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}
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