1 files changed, 68 insertions, 0 deletions
diff --git a/serialize/world-reader.cpp b/serialize/world-reader.cpp
new file mode 100644
index 00000000..86b07834
--- /dev/null
+++ b/serialize/world-reader.cpp
@@ -0,0 +1,68 @@
+#define FM_SERIALIZE_WORLD_IMPL
+#include "world-impl.hpp"
+#include "binary-reader.inl"
+#include "src/world.hpp"
+
+namespace floormat::Serialize {
+
+namespace {
+
+struct reader_state final {
+    explicit reader_state(world& world) noexcept;
+    void deserialize_world(ArrayView<const char> buf);
+
+private:
+    std::shared_ptr<tile_atlas> lookup_atlas(atlasid id);
+    void read_atlases();
+    void read_chunks();
+
+    std::unordered_map<atlasid, std::shared_ptr<tile_atlas>> atlases;
+    struct world* world;
+};
+
+reader_state::reader_state(struct world& world) noexcept : world{&world} {}
+
+void reader_state::deserialize_world(ArrayView<const char> buf)
+{
+    auto s = binary_reader{buf};
+    if (!!::memcmp(s.read<std::size(file_magic)-1>().data(), file_magic, std::size(file_magic)-1))
+        fm_abort("bad magic");
+}
+
+} // namespace
+
+} // namespace floormat::Serialize
+
+namespace floormat {
+
+world world::deserialize(StringView filename)
+{
+    char errbuf[128];
+    constexpr auto strerror = []<std::size_t N> (char (&buf)[N]) -> const char* {
+        ::strerror_s(buf, std::size(buf), errno);
+        return buf;
+    };
+    fm_assert(filename.flags() & StringViewFlag::NullTerminated);
+    FILE_raii f = ::fopen(filename.data(), "r");
+    if (!f)
+        fm_abort("fopen(\"%s\", \"r\"): %s", filename.data(), strerror(errbuf));
+    if (int ret = ::fseek(f, 0, SEEK_END); ret != 0)
+        fm_abort("fseek(\"%s\", 0, SEEK_END): %s", filename.data(), strerror(errbuf));
+    std::size_t len;
+    if (auto len_ = ::ftell(f); len_ >= 0)
+        len = (std::size_t)len_;
+    else
+        fm_abort("ftell(\"%s\"): %s", filename.data(), strerror(errbuf));
+    if (int ret = ::fseek(f, 0, SEEK_SET); ret != 0)
+        fm_abort("fseek(\"%s\", 0, SEEK_SET): %s", filename.data(), strerror(errbuf));
+    auto buf_ = std::make_unique<char[]>(len);
+    if (auto ret = ::fread(&buf_[0], len, 1, f); ret != 1)
+        fm_abort("fread(\"%s\", %zu): %s", filename.data(), len, strerror(errbuf));
+
+    world w;
+    Serialize::reader_state s{w};
+    s.deserialize_world({buf_.get(), len});
+    return w;
+}
+
+} // namespace floormat