refactor: rename Checksum to Label

Label is a clearer and more accurate name for the type now that it is
not just a checksum.

Also, serialize a Label in tests, rather than using string literals.
This is more correct, and we'll be changing serialization later.

Sponsored-by: author

1 files changed, 0 insertions, 49 deletions

diff --git a/src/checksummer.rs b/src/checksummer.rs
deleted file mode 100644
index 6d7303b..0000000
--- a/src/checksummer.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-//! Compute checksums of data.
-//!
-//! De-duplication of backed up data in Obnam relies on cryptographic
-//! checksums. They are implemented in this module. Note that Obnam
-//! does not aim to make these algorithms configurable, so only a very
-//! small number of carefully chosen algorithms are supported here.
-
-use sha2::{Digest, Sha256};
-use std::fmt;
-
-/// A checksum of some data.
-#[derive(Debug, Clone)]
-pub enum Checksum {
-    /// An arbitrary, literal string.
-    Literal(String),
-
-    /// A SHA256 checksum.
-    Sha256(String),
-}
-
-impl Checksum {
-    /// Construct a literal string.
-    pub fn literal(s: &str) -> Self {
-        Self::Literal(s.to_string())
-    }
-
-    /// Compute a SHA256 checksum for a block of data.
-    pub fn sha256(data: &[u8]) -> Self {
-        let mut hasher = Sha256::new();
-        hasher.update(data);
-        let hash = hasher.finalize();
-        Self::Sha256(format!("{:x}", hash))
-    }
-
-    /// Create a `Checksum` from a known, previously computed hash.
-    pub fn sha256_from_str_unchecked(hash: &str) -> Self {
-        Self::Sha256(hash.to_string())
-    }
-}
-
-impl fmt::Display for Checksum {
-    /// Format a checksum for display.
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Literal(s) => write!(f, "{}", s),
-            Self::Sha256(hash) => write!(f, "{}", hash),
-        }
-    }
-}