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feat: pre-read region chunks offsets table

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This commit is contained in:
MihailRis 2025-12-09 01:20:41 +03:00
parent 2e44aa7d19
commit 1f73dc5d5e
2 changed files with 17 additions and 4 deletions
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20
src/world/files/RegionsLayer.cpp
View file

@ -50,6 +50,20 @@ regfile::regfile(io::path filename) : file(filename), filename(filename) {
" is not supported in " + filename.string()
);
}
size_t file_size = file.length();
size_t table_offset = file_size - REGION_CHUNKS_COUNT * 4;
file.seekg(table_offset);
file.read(
reinterpret_cast<char*>(offsets.data()),
sizeof(uint32_t) * REGION_CHUNKS_COUNT
);
if (dataio::is_big_endian()) {
for (size_t i = 0; i < offsets.size(); i++) {
offsets[i] = dataio::le2h(i);
}
}
}
std::unique_ptr<ubyte[]> regfile::read(
@ -58,14 +72,12 @@ std::unique_ptr<ubyte[]> regfile::read(
size_t file_size = file.length();
size_t table_offset = file_size - REGION_CHUNKS_COUNT * 4;
uint32_t buff32;
file.seekg(table_offset + index * 4);
file.read(reinterpret_cast<char*>(&buff32), 4);
uint32_t offset = dataio::le2h(buff32);
uint32_t offset = offsets.at(index);
if (offset == 0) {
return nullptr;
}
uint32_t buff32;
file.seekg(offset);
file.read(reinterpret_cast<char*>(&buff32), 4);
size = dataio::le2h(buff32);

1
src/world/files/WorldRegions.hpp
View file

@ -55,6 +55,7 @@ struct regfile {
io::path filename;
int version;
bool inUse = false;
std::array<uint32_t, REGION_CHUNKS_COUNT> offsets;
regfile(io::path filename);
regfile(const regfile&) = delete;