1 files changed, 51 insertions, 0 deletions
diff --git a/src/database/track.cpp b/src/database/track.cpp
new file mode 100644
index 00000000..00acc1f6
--- /dev/null
+++ b/src/database/track.cpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "track.hpp"
+
+#include <komihash.h>
+
+namespace database {
+
+/* Helper function to update a komihash stream with a std::string. */
+auto HashString(komihash_stream_t* stream, std::string str) -> void {
+  komihash_stream_update(stream, str.c_str(), str.length());
+}
+
+/*
+ * Uses a komihash stream to incrementally hash tags. This lowers the function's
+ * memory footprint a little so that it's safe to call from any stack.
+ */
+auto TrackTags::Hash() const -> uint64_t {
+  // TODO(jacqueline): this function doesn't work very well for tracks with no
+  // tags at all.
+  komihash_stream_t stream;
+  komihash_stream_init(&stream, 0);
+  HashString(&stream, title.value_or(""));
+  HashString(&stream, artist.value_or(""));
+  HashString(&stream, album.value_or(""));
+  return komihash_stream_final(&stream);
+}
+
+auto TrackData::UpdateHash(uint64_t new_hash) const -> TrackData {
+  return TrackData(id_, filepath_, new_hash, play_count_, is_tombstoned_);
+}
+
+auto TrackData::Entomb() const -> TrackData {
+  return TrackData(id_, filepath_, tags_hash_, play_count_, true);
+}
+
+auto TrackData::Exhume(const std::string& new_path) const -> TrackData {
+  return TrackData(id_, new_path, tags_hash_, play_count_, false);
+}
+
+void swap(Track& first, Track& second) {
+  Track temp = first;
+  first = second;
+  second = temp;
+}
+
+}  // namespace database