add decode functions for info and data packets

internal/decoders/info_tracker_chunk.go

@@ -0,0 +1,49 @@
+package decoders
+
+import (
+	"encoding/binary"
+	"log/slog"
+)
+
+type InfoTrackerChunkData struct {
+	TrackerName *InfoTrackerNameChunk
+}
+
+func decodeInfoTrackerChunkData(infoTrackerChunk Chunk) InfoTrackerChunkData {
+	data := InfoTrackerChunkData{}
+
+	if infoTrackerChunk.Header.HasSubchunks && infoTrackerChunk.ChunkData != nil && infoTrackerChunk.Header.DataLen > 0 {
+		offset := 0
+
+		for offset < int(infoTrackerChunk.Header.DataLen) {
+
+			switch id := binary.LittleEndian.Uint16(infoTrackerChunk.ChunkData[offset : offset+2]); id {
+			case 0:
+				tracker_name := DecodeInfoTrackerNameChunk(infoTrackerChunk.ChunkData[offset:])
+				data.TrackerName = &tracker_name
+				offset = offset + CHUNK_HEADER_SIZE
+				if tracker_name.Chunk.Header.DataLen > 0 {
+					offset = offset + int(tracker_name.Chunk.Header.DataLen)
+				}
+			default:
+				slog.Error("unhandled info tracker chunk id", "id", id)
+			}
+		}
+	}
+	return data
+}
+
+type InfoTrackerChunk struct {
+	Chunk Chunk
+	Data  InfoTrackerChunkData
+}
+
+func DecodeInfoTrackerChunk(bytes []byte) InfoTrackerChunk {
+	chunk := DecodeChunk(bytes)
+	data := decodeInfoTrackerChunkData(chunk)
+
+	return InfoTrackerChunk{
+		Chunk: chunk,
+		Data:  data,
+	}
+}