From a6a2a6281218688de7a74a9cd2a426aad3fe2da2 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sun, 1 Feb 2015 01:38:20 +0100
Subject: More convenient tag access

---
 src/World/Chunk.cpp | 12 ++++++------
 src/World/Chunk.hpp |  8 +++-----
 2 files changed, 9 insertions(+), 11 deletions(-)

(limited to 'src/World')

diff --git a/src/World/Chunk.cpp b/src/World/Chunk.cpp
index ccd0d87..f3a140d 100644
--- a/src/World/Chunk.cpp
+++ b/src/World/Chunk.cpp
@@ -36,7 +36,7 @@
 namespace MinedMap {
 namespace World {
 
-std::tuple<UniqueCPtr<uint8_t[]>, size_t> Chunk::inflateChunk(uint8_t *data, size_t len) {
+std::pair<UniqueCPtr<uint8_t[]>, size_t> Chunk::inflateChunk(uint8_t *data, size_t len) {
 	size_t outlen = 0;
 	uint8_t *output = nullptr;
 
@@ -67,7 +67,7 @@ std::tuple<UniqueCPtr<uint8_t[]>, size_t> Chunk::inflateChunk(uint8_t *data, siz
 
 	inflateEnd(&stream);
 
-	return std::make_tuple(UniqueCPtr<uint8_t[]>(output), stream.total_out);
+	return std::make_pair(UniqueCPtr<uint8_t[]>(output), stream.total_out);
 }
 
 Chunk::Chunk(uint8_t *buffer, size_t buflen) {
@@ -89,12 +89,12 @@ Chunk::Chunk(uint8_t *buffer, size_t buflen) {
 	std::cerr << "Chunk has size " << size << " (" << len << " inflated)" << std::endl;
 
 	Buffer nbt(data.get(), len);
+	std::pair<std::string, std::shared_ptr<const NBT::Tag>> tag = NBT::Tag::readNamedTag(&nbt);
 
-	std::pair<std::string, std::shared_ptr<NBT::Tag>> tag = NBT::Tag::readNamedTag(&nbt);
-	if (tag.first != "")
-		throw std::invalid_argument("non-empty root tag");
+	std::shared_ptr<const NBT::CompoundTag>::operator=(std::dynamic_pointer_cast<const NBT::CompoundTag>(tag.second));
 
-	content = std::move(tag.second);
+	if (!(*this) || tag.first != "")
+		throw std::invalid_argument("invalid root tag");
 }
 
 }
diff --git a/src/World/Chunk.hpp b/src/World/Chunk.hpp
index eba4626..7c485eb 100644
--- a/src/World/Chunk.hpp
+++ b/src/World/Chunk.hpp
@@ -28,7 +28,7 @@
 
 
 #include "../UniqueCPtr.hpp"
-#include "../NBT/Tag.hpp"
+#include "../NBT/CompoundTag.hpp"
 
 #include <cstdint>
 #include <tuple>
@@ -37,14 +37,12 @@
 namespace MinedMap {
 namespace World {
 
-class Chunk {
+class Chunk : public std::shared_ptr<const NBT::CompoundTag> {
 public:
 	static const size_t SIZE = 16;
 
 private:
-	static std::tuple<UniqueCPtr<uint8_t[]>, size_t> inflateChunk(uint8_t *data, size_t len);
-
-	std::shared_ptr<NBT::Tag> content;
+	static std::pair<UniqueCPtr<uint8_t[]>, size_t> inflateChunk(uint8_t *data, size_t len);
 
 public:
 	Chunk(uint8_t *buffer, size_t buflen);
-- 
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