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WorldFiles region format and magic check

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This commit is contained in:
MihailRis
2024-01-03 23:25:58 +03:00
parent e7e2c16ee6
commit 460b08a006
3 changed files with 47 additions and 19 deletions
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src/files/WorldFiles.cpp
+33 -13
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@@ -23,9 +23,27 @@
#include <cstdint>
#include <fstream>
#include <sstream>
#include <cstring>
namespace fs = std::filesystem;
regfile::regfile(fs::path filename) : file(filename) {
if (file.length() < REGION_HEADER_SIZE)
throw std::runtime_error("incomplete region file header");
char header[REGION_HEADER_SIZE];
file.read(header, REGION_HEADER_SIZE);
// avoid of use strcmp_s
if (std::string(header, strlen(REGION_FORMAT_MAGIC)) != REGION_FORMAT_MAGIC) {
throw std::runtime_error("invalid region file magic number");
}
version = header[8];
if (version > 2) {
throw std::runtime_error(
"region format "+std::to_string(version)+" is not supported");
}
}
WorldRegion::WorldRegion() {
chunksData = new ubyte*[REGION_CHUNKS_COUNT]{};
sizes = new uint32_t[REGION_CHUNKS_COUNT]{};
@@ -252,7 +270,8 @@ ubyte* WorldFiles::getData(regionsmap& regions, const fs::path& folder,
return nullptr;
}
files::rafile* WorldFiles::getRegFile(glm::ivec3 coord, const fs::path& folder) {
regfile* WorldFiles::getRegFile(glm::ivec3 coord, const fs::path& folder) {
const auto found = openRegFiles.find(coord);
if (found != openRegFiles.end()) {
return found->second.get();
@@ -266,7 +285,7 @@ files::rafile* WorldFiles::getRegFile(glm::ivec3 coord, const fs::path& folder)
if (!fs::is_regular_file(filename)) {
return nullptr;
}
openRegFiles[coord] = std::make_unique<files::rafile>(filename);
openRegFiles[coord] = std::make_unique<regfile>(filename);
return openRegFiles[coord].get();
}
@@ -285,26 +304,27 @@ ubyte* WorldFiles::readChunkData(int x,
int chunkIndex = localZ * REGION_SIZE + localX;
glm::ivec3 coord(regionX, regionZ, layer);
files::rafile* file = WorldFiles::getRegFile(coord, folder);
if (file == nullptr) {
regfile* rfile = WorldFiles::getRegFile(coord, folder);
if (rfile == nullptr) {
return nullptr;
}
files::rafile& file = rfile->file;
size_t file_size = file->length();
size_t file_size = file.length();
size_t table_offset = file_size - REGION_CHUNKS_COUNT * 4;
uint32_t offset;
file->seekg(table_offset + chunkIndex * 4);
file->read((char*)(&offset), 4);
file.seekg(table_offset + chunkIndex * 4);
file.read((char*)(&offset), 4);
offset = dataio::read_int32_big((const ubyte*)(&offset), 0);
if (offset == 0){
return nullptr;
}
file->seekg(offset);
file->read((char*)(&offset), 4);
file.seekg(offset);
file.read((char*)(&offset), 4);
length = dataio::read_int32_big((const ubyte*)(&offset), 0);
ubyte* data = new ubyte[length];
file->read((char*)data, length);
file.read((char*)data, length);
if (data == nullptr) {
std::cerr << "ERROR: failed to read data of chunk x("<< x <<"), z("<< z <<")" << std::endl;
}
@@ -343,13 +363,13 @@ void WorldFiles::writeRegion(int x, int z, WorldRegion* entry, fs::path folder,
openRegFiles.erase(regcoord);
}
char header[10] = REGION_FORMAT_MAGIC;
char header[REGION_HEADER_SIZE] = REGION_FORMAT_MAGIC;
header[8] = REGION_FORMAT_VERSION;
header[9] = 0; // flags
std::ofstream file(filename, std::ios::out | std::ios::binary);
file.write(header, 10);
file.write(header, REGION_HEADER_SIZE);
size_t offset = 10;
size_t offset = REGION_HEADER_SIZE;
char intbuf[4]{};
uint offsets[REGION_CHUNKS_COUNT]{};