Untangle caching code

1 files changed, 17 insertions, 0 deletions

diff --git a/dhall/src/utils.rs b/dhall/src/utils.rs
new file mode 100644
index 0000000..d1e642a
--- /dev/null
+++ b/dhall/src/utils.rs
@@ -0,0 +1,17 @@
+use std::fs::File;
+use std::io::Read;
+use std::path::Path;
+
+use crate::error::Error;
+
+// Compute the sha256 hash of a bitstring.
+pub fn sha256_hash(data: &[u8]) -> Box<[u8]> {
+    use sha2::Digest;
+    sha2::Sha256::digest(data).as_slice().into()
+}
+
+pub fn read_binary_file(path: impl AsRef<Path>) -> Result<Box<[u8]>, Error> {
+    let mut buffer = Vec::new();
+    File::open(path)?.read_to_end(&mut buffer)?;
+    Ok(buffer.into())
+}