1 files changed, 32 insertions, 0 deletions
diff --git a/internal/ioutil/ioutil.go b/internal/ioutil/ioutil.go
index 7fe6cfc..8e98c65 100644
--- a/internal/ioutil/ioutil.go
+++ b/internal/ioutil/ioutil.go
@@ -1,6 +1,7 @@
 package ioutil
 
 import (
+	"crypto/sha256"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -54,3 +55,34 @@ func DirectoriesExist(paths []string) error {
 	}
 	return nil
 }
+
+func CopyHashes(hashes [][sha256.Size]byte) (ret [][sha256.Size]byte) {
+	for _, hash := range hashes {
+		var dst [sha256.Size]byte
+		copy(dst[:], hash[:])
+		ret = append(ret, dst)
+	}
+	return
+}
+
+func SliceHashes(hashes [][sha256.Size]byte) (ret [][]byte) {
+	for _, hash := range hashes {
+		dst := hash
+		ret = append(ret, dst[:])
+	}
+	return
+}
+
+// UnsliceHashes panics unless all hashes are 32 bytes
+func UnsliceHashes(hashes [][]byte) (ret [][sha256.Size]byte) {
+	for _, hash := range hashes {
+		if got, want := len(hash), sha256.Size; got != want {
+			panic(fmt.Sprintf("bug: invalid hash: size %d", got))
+		}
+
+		var dst [sha256.Size]byte
+		copy(dst[:], hash)
+		ret = append(ret, dst)
+	}
+	return
+}