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Separate splitting of regions into chunks and actual parsing of chunk structure

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This commit is contained in:
Matthias Schiffer 2018-07-20 23:33:11 +02:00
parent 4b9bb2ab48
commit c082c8800c
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
8 changed files with 170 additions and 79 deletions
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63
src/World/Chunk.cpp
View file

@ -1,5 +1,5 @@
/*
Copyright (c) 2015, Matthias Schiffer <mschiffer@universe-factory.net>
Copyright (c) 2015-2018, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -38,66 +38,9 @@
namespace MinedMap {
namespace World {
Chunk::Chunk(Buffer buffer) {
size_t size = buffer.get32();
Chunk::Chunk(const ChunkData *data) {
level = assertValue(data->getRoot().get<NBT::CompoundTag>("Level"));
Buffer buffer2(buffer.get(size), size);
uint8_t format = buffer2.get8();
if (format != 2)
throw std::invalid_argument("unknown chunk format");
inflateChunk(buffer2);
parseChunk();
analyzeChunk();
}
void Chunk::inflateChunk(Buffer buffer) {
size_t outlen = 0;
uint8_t *output = nullptr;
z_stream stream = {};
int ret = inflateInit(&stream);
if (ret != Z_OK)
throw std::runtime_error("inflateInit() failed");
stream.avail_in = buffer.getRemaining();
stream.next_in = const_cast<uint8_t *>(buffer.get(stream.avail_in));
while (stream.avail_in) {
outlen += 65536;
output = static_cast<uint8_t *>(std::realloc(output, outlen));
stream.next_out = output + stream.total_out;
stream.avail_out = outlen - stream.total_out;
ret = inflate(&stream, Z_NO_FLUSH);
switch (ret) {
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
inflateEnd(&stream);
throw std::runtime_error("inflate() failed");
}
}
inflateEnd(&stream);
len = stream.total_out;
data = UniqueCPtr<uint8_t[]>(output);
}
void Chunk::parseChunk() {
Buffer nbt(data.get(), len);
std::pair<std::string, std::shared_ptr<const NBT::Tag>> tag = NBT::Tag::readNamedTag(&nbt);
if (tag.first != "")
throw std::invalid_argument("invalid root tag");
root = assertValue(std::dynamic_pointer_cast<const NBT::CompoundTag>(tag.second));
level = assertValue(root->get<NBT::CompoundTag>("Level"));
}
void Chunk::analyzeChunk() {
std::shared_ptr<const NBT::ByteTag> lightPopulatedTag = level->get<NBT::ByteTag>("LightPopulated");
bool lightPopulated = lightPopulatedTag && lightPopulatedTag->getValue();

17
src/World/Chunk.hpp
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@ -1,5 +1,5 @@
/*
Copyright (c) 2015, Matthias Schiffer <mschiffer@universe-factory.net>
Copyright (c) 2015-2018, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -28,10 +28,8 @@
#include "Block.hpp"
#include "../Buffer.hpp"
#include "../UniqueCPtr.hpp"
#include "ChunkData.hpp"
#include "../Util.hpp"
#include "../NBT/CompoundTag.hpp"
#include "../NBT/ListTag.hpp"
#include "../NBT/ByteTag.hpp"
#include "../NBT/ByteArrayTag.hpp"
@ -53,10 +51,6 @@ public:
private:
size_t len;
UniqueCPtr<uint8_t[]> data;
std::shared_ptr<const NBT::CompoundTag> root;
std::shared_ptr<const NBT::CompoundTag> level;
std::shared_ptr<const NBT::ListTag<NBT::CompoundTag>> sections;
@ -106,13 +100,8 @@ private:
return biomes[z*SIZE + x];
}
void inflateChunk(Buffer buffer);
void parseChunk();
void analyzeChunk();
public:
Chunk(Buffer buffer);
Chunk(const ChunkData *data);
const NBT::CompoundTag & getLevel() const {
return *level;

97
src/World/ChunkData.cpp Normal file
View file

@ -0,0 +1,97 @@
/*
Copyright (c) 2015-2018, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ChunkData.hpp"
#include <iostream>
#include <stdexcept>
#include <cstdlib>
#include <zlib.h>
namespace MinedMap {
namespace World {
ChunkData::ChunkData(Buffer buffer) {
size_t size = buffer.get32();
Buffer buffer2(buffer.get(size), size);
uint8_t format = buffer2.get8();
if (format != 2)
throw std::invalid_argument("unknown chunk format");
inflateChunk(buffer2);
parseChunk();
}
void ChunkData::inflateChunk(Buffer buffer) {
size_t outlen = 0;
uint8_t *output = nullptr;
z_stream stream = {};
int ret = inflateInit(&stream);
if (ret != Z_OK)
throw std::runtime_error("inflateInit() failed");
stream.avail_in = buffer.getRemaining();
stream.next_in = const_cast<uint8_t *>(buffer.get(stream.avail_in));
while (stream.avail_in) {
outlen += 65536;
output = static_cast<uint8_t *>(std::realloc(output, outlen));
stream.next_out = output + stream.total_out;
stream.avail_out = outlen - stream.total_out;
ret = inflate(&stream, Z_NO_FLUSH);
switch (ret) {
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
inflateEnd(&stream);
throw std::runtime_error("inflate() failed");
}
}
inflateEnd(&stream);
len = stream.total_out;
data = UniqueCPtr<uint8_t[]>(output);
}
void ChunkData::parseChunk() {
Buffer nbt(data.get(), len);
std::pair<std::string, std::shared_ptr<const NBT::Tag>> tag = NBT::Tag::readNamedTag(&nbt);
if (tag.first != "")
throw std::invalid_argument("invalid root tag");
root = assertValue(std::dynamic_pointer_cast<const NBT::CompoundTag>(tag.second));
}
}
}

60
src/World/ChunkData.hpp Normal file
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@ -0,0 +1,60 @@
/*
Copyright (c) 2015-2018, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "../Buffer.hpp"
#include "../UniqueCPtr.hpp"
#include "../Util.hpp"
#include "../NBT/CompoundTag.hpp"
#include <cstdint>
namespace MinedMap {
namespace World {
class ChunkData {
private:
size_t len;
UniqueCPtr<uint8_t[]> data;
std::shared_ptr<const NBT::CompoundTag> root;
void inflateChunk(Buffer buffer);
void parseChunk();
public:
ChunkData(Buffer buffer);
const NBT::CompoundTag & getRoot() const {
return *root;
}
};
}
}

2
src/World/Region.cpp
View file

@ -91,7 +91,7 @@ void Region::visitChunks(const char *filename, const ChunkVisitor &visitor) {
uint8_t buffer[len * 4096];
file.read((char *)buffer, len * 4096);
Chunk chunk(Buffer(buffer, len * 4096));
ChunkData chunk(Buffer(buffer, len * 4096));
visitor(x, z, &chunk);
i += len;

2
src/World/Region.hpp
View file

@ -42,7 +42,7 @@ class Region {
public:
static const size_t SIZE = 32;
typedef std::function<void (size_t, size_t, const Chunk *)> ChunkVisitor;
typedef std::function<void (size_t, size_t, const ChunkData *)> ChunkVisitor;
Region() = delete;