EU7 scenery format and models streaming

scene/eu7/eu7_reader.h

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+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "scene/eu7/eu7_types.h"
+
+#include <istream>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace scene::eu7 {
+
+[[nodiscard]] Eu7Module
+read_module( std::string const &Path );
+
+[[nodiscard]] bool
+is_valid_eu7b_file( std::string const &Path );
+
+// Szuka wpisu PIDX dla sekcji 1 km (row/column jak basic_region::section).
+[[nodiscard]] std::optional<Eu7PackIndexEntry>
+find_pack_entry( Eu7Module const &Module, int Row, int Column );
+
+// Odczyt MODL z chunku PACK dla jednej sekcji (world-space, po bake).
+[[nodiscard]] std::vector<Eu7Model>
+read_pack_section( Eu7Module const &Module, int Row, int Column );
+
+// Seek do pack_offset z PIDX i parsuj naglowek sekcji (v7/v8).
+void
+seek_pack_section(
+    Eu7Module const &Module,
+    std::istream &Input,
+    Eu7PackIndexEntry const &Entry,
+    Eu7PackSectionCursor &Cursor );
+
+// Odczyt do max_count modeli z biezacej pozycji strumienia (po seek_pack_section).
+[[nodiscard]] std::vector<Eu7Model>
+read_pack_models_chunk(
+    Eu7Module const &Module,
+    std::istream &Input,
+    Eu7PackSectionCursor &Cursor,
+    std::size_t MaxCount );
+
+// Wznowienie odczytu sub-chunka (offset wzgledem pack_offset sekcji z PIDX).
+void
+resume_pack_section(
+    Eu7Module const &Module,
+    std::istream &Input,
+    Eu7PackIndexEntry const &Entry,
+    std::uint64_t ResumeByteOffset,
+    Eu7PackSectionCursor ResumeCursor,
+    Eu7PackSectionCursor &Cursor );
+
+} // namespace scene::eu7