feat: resource.pack estil coffee_crisis — Fase 1 (pack + helper + eina pack_resources)

source/core/resources/resource_pack.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+// Entrada d'un recurs dins el pack (format AEE, equivalent a CCAE).
+struct ResourceEntry {
+    std::string filename;
+    uint64_t offset{0};
+    uint64_t size{0};
+    uint32_t checksum{0};
+};
+
+// Pack binari de recursos carregat a memòria. Formato:
+//   Header:   "AEE1" (4 bytes) + version uint32 + resource_count uint32
+//   Index:    per cada recurs -> filename_len uint32 + filename + offset uint64
+//             + size uint64 + checksum uint32
+//   Payload:  data_size uint64 + bytes xifrats amb XOR (DEFAULT_ENCRYPT_KEY)
+class ResourcePack {
+   public:
+    ResourcePack();
+    ~ResourcePack();
+
+    // I/O del fitxer
+    auto loadPack(const std::string& pack_file) -> bool;
+    auto savePack(const std::string& pack_file) -> bool;
+
+    // Builders usats per l'eina pack_resources
+    auto addFile(const std::string& filename, const std::string& filepath) -> bool;
+    auto addDirectory(const std::string& directory) -> bool;
+
+    [[nodiscard]] auto getResource(const std::string& filename) -> std::vector<uint8_t>;
+    [[nodiscard]] auto hasResource(const std::string& filename) const -> bool;
+
+    void clear();
+    [[nodiscard]] auto getResourceCount() const -> size_t;
+    [[nodiscard]] auto getResourceList() const -> std::vector<std::string>;
+
+    static const std::string DEFAULT_ENCRYPT_KEY;
+
+   private:
+    std::unordered_map<std::string, ResourceEntry> resources_;
+    std::vector<uint8_t> data_;
+    bool loaded_{false};
+
+    static auto calculateChecksum(const std::vector<uint8_t>& data) -> uint32_t;
+    static void encryptData(std::vector<uint8_t>& data, const std::string& key);
+    static void decryptData(std::vector<uint8_t>& data, const std::string& key);
+};