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#define FM_SERIALIZE_WORLD_IMPL
#include "world-impl.hpp"
#include "binary-reader.inl"
#include "src/world.hpp"
#include "src/loader.hpp"
#include "src/tile-atlas.hpp"
#include <cstring>
namespace floormat::Serialize {
struct reader_state final {
explicit reader_state(world& world) noexcept;
void deserialize_world(ArrayView<const char> buf);
private:
using reader_t = binary_reader<decltype(ArrayView<const char>{}.cbegin())>;
std::shared_ptr<tile_atlas> lookup_atlas(atlasid id);
void read_atlases(reader_t& reader);
void read_chunks(reader_t& reader);
std::unordered_map<atlasid, std::shared_ptr<tile_atlas>> atlases;
world* _world;
};
reader_state::reader_state(world& world) noexcept : _world{&world} {}
void reader_state::read_atlases(reader_t& s)
{
const auto N = s.read<atlasid>();
atlases.reserve(N * 2);
for (atlasid i = 0; i < N; i++)
{
Vector2ub size;
s >> size[0];
s >> size[1];
const auto& [buf, len] = s.read_asciiz_string<atlas_name_max>();
atlases[i] = loader.tile_atlas({buf, len}, size);
}
}
std::shared_ptr<tile_atlas> reader_state::lookup_atlas(atlasid id)
{
if (auto it = atlases.find(id); it != atlases.end())
return it->second;
else
fm_abort("not such atlas: '%zu'", (std::size_t)id);
}
void reader_state::read_chunks(reader_t& s)
{
const auto N = s.read<chunksiz>();
for (std::size_t i = 0; i < N; i++)
{
std::decay_t<decltype(chunk_magic)> magic;
s >> magic;
if (magic != chunk_magic)
fm_abort("bad chunk magic");
chunk_coords coord;
s >> coord.x;
s >> coord.y;
auto& chunk = (*_world)[coord];
for (std::size_t i = 0; i < TILE_COUNT; i++)
{
const tilemeta flags = s.read<tilemeta>();
tile_ref t = chunk[i];
using uchar = std::uint8_t;
const auto make_atlas = [&]() -> tile_image_proto {
auto id = flags & meta_short_atlasid ? (atlasid)(s.read<uchar>()) : s.read<atlasid>();
auto v = flags & meta_short_variant ? (varid) (s.read<uchar>()) : s.read<varid>();
auto atlas = lookup_atlas(id);
fm_assert(v < atlas->num_tiles());
return { atlas, v };
};
if (flags & meta_ground)
t.ground() = make_atlas();
if (flags & meta_wall_n)
t.wall_north() = make_atlas();
if (flags & meta_wall_w)
t.wall_west() = make_atlas();
switch (auto x = pass_mode(flags & pass_mask))
{
case pass_shoot_through:
case pass_blocked:
case pass_ok:
t.pass_mode() = x;
break;
default:
fm_abort("bad pass mode '%zu' for tile %zu", i, (std::size_t)x);
}
}
}
}
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");
std::decay_t<decltype(proto_version)> proto;
s >> proto;
if (proto != proto_version)
fm_abort("bad proto version '%zu' (should be '%zu')",
(std::size_t)proto, (std::size_t)proto_version);
read_atlases(s);
read_chunks(s);
s.assert_end();
}
} // 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* {
#ifndef _WIN32
::strerror_r(errno, buf, std::size(buf));
#else
::strerror_s(buf, std::size(buf), errno);
#endif
return buf;
};
fm_assert(filename.flags() & StringViewFlag::NullTerminated);
FILE_raii f = ::fopen(filename.data(), "rb");
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(SEEK_END): %s", strerror(errbuf));
std::size_t len;
if (auto len_ = ::ftell(f); len_ >= 0)
len = (std::size_t)len_;
else
fm_abort("ftell: %s", strerror(errbuf));
if (int ret = ::fseek(f, 0, SEEK_SET); ret != 0)
fm_abort("fseek(SEEK_SET): %s", strerror(errbuf));
auto buf_ = std::make_unique<char[]>(len);
if (auto ret = ::fread(&buf_[0], 1, len, f); ret != len)
fm_abort("fread short read: %s", strerror(errbuf));
world w;
Serialize::reader_state s{w};
s.deserialize_world({buf_.get(), len});
return w;
}
} // namespace floormat
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