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/*
* CArchiveLoader.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#pragma once
#include "ISimpleResourceLoader.h"
#include "ResourceID.h"
class CFileInputStream;
/**
* A struct which holds information about the archive entry e.g. where it is located in space of the archive container.
*/
struct ArchiveEntry
{
/**
* Default c-tor.
*/
ArchiveEntry();
/** Entry name **/
std::string name;
/** Distance in bytes from beginning **/
int offset;
/** Size without compression in bytes **/
int fullSize;
/** Size with compression in bytes or 0 if not compressed **/
int compressedSize;
};
/**
* A class which can scan and load files of a LOD archive.
*/
class DLL_LINKAGE CArchiveLoader : public ISimpleResourceLoader
{
public:
/**
* Ctor.
*
* The file extension of the param archive determines the type of the Lod file.
* These are valid extensions: .LOD, .SND, .VID
*
* @param archive Specifies the file path to the archive which should be indexed and loaded.
*
* @throws std::runtime_error if the archive wasn't found or if the archive isn't supported
*/
CArchiveLoader(std::string mountPoint, boost::filesystem::path archive);
/// Interface implementation
/// @see ISimpleResourceLoader
std::unique_ptr<CInputStream> load(const ResourceID & resourceName) const override;
bool existsResource(const ResourceID & resourceName) const override;
std::string getMountPoint() const override;
void updateFilteredFiles(std::function<bool(const std::string &)> filter) const override {}
std::unordered_set<ResourceID> getFilteredFiles(std::function<bool(const ResourceID &)> filter) const override;
private:
/**
* Initializes a LOD archive.
*
* @param fileStream File stream to the .lod archive
*/
void initLODArchive(const std::string &mountPoint, CFileInputStream & fileStream);
/**
* Initializes a VID archive.
*
* @param fileStream File stream to the .vid archive
*/
void initVIDArchive(const std::string &mountPoint, CFileInputStream & fileStream);
/**
* Initializes a SND archive.
*
* @param fileStream File stream to the .snd archive
*/
void initSNDArchive(const std::string &mountPoint, CFileInputStream & fileStream);
/** The file path to the archive which is scanned and indexed. */
boost::filesystem::path archive;
std::string mountPoint;
/** Holds all entries of the archive file. An entry can be accessed via the entry name. **/
std::unordered_map<ResourceID, ArchiveEntry> entries;
};
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