95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
// resource_pack.hpp
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// Resource pack file format and management for JailDoctor's Dilemma
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// Based on Coffee Crisis Arcade Edition resource pack system
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#ifndef RESOURCE_PACK_HPP
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#define RESOURCE_PACK_HPP
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#include <array>
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#include <cstdint>
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#include <string>
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#include <unordered_map>
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#include <vector>
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namespace jdd {
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// Entry metadata for each resource in the pack
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struct ResourceEntry {
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std::string filename; // Relative path within pack
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uint64_t offset; // Byte offset in data block
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uint64_t size; // Size in bytes
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uint32_t checksum; // CRC32 checksum for verification
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};
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// Resource pack file format
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// Header: "JDDI" (4 bytes) + Version (4 bytes)
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// Metadata: Count + array of ResourceEntry
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// Data: Encrypted data block
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class ResourcePack {
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public:
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ResourcePack() = default;
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~ResourcePack() = default;
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// Disable copy/move
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ResourcePack(const ResourcePack&) = delete;
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ResourcePack& operator=(const ResourcePack&) = delete;
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ResourcePack(ResourcePack&&) = delete;
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ResourcePack& operator=(ResourcePack&&) = delete;
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// Add a single file to the pack
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auto addFile(const std::string& filepath, const std::string& pack_name) -> bool;
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// Add all files from a directory recursively
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auto addDirectory(const std::string& dir_path, const std::string& base_path = "")
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-> bool;
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// Save the pack to a file
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auto savePack(const std::string& pack_file) -> bool;
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// Load a pack from a file
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auto loadPack(const std::string& pack_file) -> bool;
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// Get a resource by name
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auto getResource(const std::string& filename) -> std::vector<uint8_t>;
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// Check if a resource exists
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auto hasResource(const std::string& filename) const -> bool;
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// Get list of all resources
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auto getResourceList() const -> std::vector<std::string>;
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// Check if pack is loaded
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auto isLoaded() const -> bool { return loaded_; }
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// Get pack statistics
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auto getResourceCount() const -> size_t { return resources_.size(); }
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auto getDataSize() const -> size_t { return data_.size(); }
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// Calculate overall pack checksum (for validation)
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auto calculatePackChecksum() const -> uint32_t;
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private:
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static constexpr std::array<char, 4> MAGIC_HEADER = {'J', 'D', 'D', 'I'};
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static constexpr uint32_t VERSION = 1;
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static constexpr const char* DEFAULT_ENCRYPT_KEY = "JDDI_RESOURCES_2024";
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// Calculate CRC32 checksum
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static auto calculateChecksum(const std::vector<uint8_t>& data) -> uint32_t;
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// XOR encryption/decryption
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static void encryptData(std::vector<uint8_t>& data, const std::string& key);
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static void decryptData(std::vector<uint8_t>& data, const std::string& key);
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// Read file from disk
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static auto readFile(const std::string& filepath) -> std::vector<uint8_t>;
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// Member data
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std::unordered_map<std::string, ResourceEntry> resources_;
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std::vector<uint8_t> data_; // Encrypted data block
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bool loaded_{false};
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};
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} // namespace jdd
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#endif // RESOURCE_PACK_HPP
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