Update internal/hashio/files.go

Co-authored-by: Alex Plischke <[email protected]>

internal/hashio/files.go

@@ -25,24 +25,19 @@ func SHA256(filename string) (string, error) {
 // HashContent computes a SHA-256 hash of the file content combined with extra content,
 // and returns the first 16 characters of the hex-encoded hash.
 func HashContent(filename string, extra ...string) (string, error) {
+	h := sha256.New()
+
 	file, err := os.Open(filePath)
 	if err != nil {
 		return "", fmt.Errorf("failed to open file: %w", err)
 	}
 	defer file.Close()
 
-	fileInfo, err := file.Stat()
-	if err != nil {
-		return "", fmt.Errorf("failed to get file info: %w", err)
-	}
-
-	buffer := make([]byte, fileInfo.Size())
-	if _, err := file.Read(buffer); err != nil {
+	if _, err := io.Copy(h, file); err != nil {
 		return "", fmt.Errorf("failed to read file: %w", err)
 	}
 
-	combinedContent := string(buffer) + strings.Join(extraContent, "")
+	h.Write([]byte(strings.Join(extraContent, "")))
 
-	hash := sha256.Sum256([]byte(combinedContent))
-	return fmt.Sprintf("%x", hash)[:15], nil
+	return fmt.Sprintf("%x", h.Sum(nil))[:16], nil
 }