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/*
* CFilesystemLoader.cpp, 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
*
*/
#include "StdInc.h"
#include "CFilesystemLoader.h"
#include "CFileInputStream.h"
#include "../ExceptionsCommon.h"
VCMI_LIB_NAMESPACE_BEGIN
CFilesystemLoader::CFilesystemLoader(std::string _mountPoint, boost::filesystem::path baseDirectory, size_t depth, bool initial):
baseDirectory(std::move(baseDirectory)),
mountPoint(std::move(_mountPoint)),
recursiveDepth(depth)
{
try {
fileList = listFiles(mountPoint, depth, initial);
}
catch (const boost::filesystem::filesystem_error & e) {
throw DataLoadingException("Failed to load content of '" + baseDirectory.string() + "'. Reason: " + e.what());
}
logGlobal->trace("File system loaded, %d files found", fileList.size());
}
std::unique_ptr<CInputStream> CFilesystemLoader::load(const ResourcePath & resourceName) const
{
assert(fileList.count(resourceName));
boost::filesystem::path file = baseDirectory / fileList.at(resourceName);
logGlobal->trace("loading %s", file.string());
return std::make_unique<CFileInputStream>(file);
}
bool CFilesystemLoader::existsResource(const ResourcePath & resourceName) const
{
return fileList.count(resourceName);
}
std::string CFilesystemLoader::getMountPoint() const
{
return mountPoint;
}
std::optional<boost::filesystem::path> CFilesystemLoader::getResourceName(const ResourcePath & resourceName) const
{
assert(existsResource(resourceName));
return baseDirectory / fileList.at(resourceName);
}
void CFilesystemLoader::updateFilteredFiles(std::function<bool(const std::string &)> filter) const
{
if (filter(mountPoint))
{
fileList = listFiles(mountPoint, recursiveDepth, false);
}
}
std::unordered_set<ResourcePath> CFilesystemLoader::getFilteredFiles(std::function<bool(const ResourcePath &)> filter) const
{
std::unordered_set<ResourcePath> foundID;
for (auto & file : fileList)
{
if (filter(file.first))
foundID.insert(file.first);
}
return foundID;
}
bool CFilesystemLoader::createResource(const std::string & requestedFilename, bool update)
{
std::string filename = requestedFilename;
ResourcePath resID(filename);
if (fileList.find(resID) != fileList.end())
return true;
if (!boost::iequals(mountPoint, filename.substr(0, mountPoint.size())))
{
logGlobal->trace("Can't create file: wrong mount point: %s", mountPoint);
return false;
}
filename = filename.substr(mountPoint.size());
if (!update)
{
// create folders if not exists
boost::filesystem::path p((baseDirectory / filename).c_str());
boost::filesystem::create_directories(p.parent_path());
// create file, if not exists
std::ofstream file((baseDirectory / filename).c_str(), std::ofstream::binary);
if (!file.is_open())
return false;
}
fileList[resID] = filename;
return true;
}
std::unordered_map<ResourcePath, boost::filesystem::path> CFilesystemLoader::listFiles(const std::string &mountPoint, size_t depth, bool initial) const
{
static const EResType initArray[] = {
EResType::DIRECTORY,
EResType::JSON,
EResType::ARCHIVE_LOD,
EResType::ARCHIVE_VID,
EResType::ARCHIVE_SND,
EResType::ARCHIVE_ZIP };
static const std::set<EResType> initialTypes(initArray, initArray + std::size(initArray));
std::unordered_map<ResourcePath, boost::filesystem::path> fileList;
if(!boost::filesystem::is_directory(baseDirectory))
return fileList;
std::vector<boost::filesystem::path> path; //vector holding relative path to our file
boost::filesystem::recursive_directory_iterator enddir;
#if BOOST_VERSION >= 107200 // 1.72
boost::filesystem::recursive_directory_iterator it(baseDirectory, boost::filesystem::directory_options::follow_directory_symlink);
#else
boost::filesystem::recursive_directory_iterator it(baseDirectory, boost::filesystem::symlink_option::recurse);
#endif
for(; it != enddir; ++it)
{
EResType type;
#if BOOST_VERSION >= 107200
const auto currentDepth = it.depth();
#else
const auto currentDepth = it.level();
#endif
if (boost::filesystem::is_directory(it->status()))
{
path.resize(currentDepth + 1);
path.back() = it->path().filename();
// don't iterate into directory if depth limit reached
#if BOOST_VERSION >= 107200
it.disable_recursion_pending(depth <= currentDepth);
#else
it.no_push(depth <= currentDepth);
#endif
type = EResType::DIRECTORY;
}
else
type = EResTypeHelper::getTypeFromExtension(it->path().extension().string());
if (!initial || vstd::contains(initialTypes, type))
{
//reconstruct relative filename (not possible via boost AFAIK)
boost::filesystem::path filename;
const size_t iterations = std::min(static_cast<size_t>(currentDepth), path.size());
if (iterations)
{
filename = path.front();
for (size_t i = 1; i < iterations; ++i)
filename /= path[i];
filename /= it->path().filename();
}
else
filename = it->path().filename();
std::string resName;
if (boost::filesystem::path::preferred_separator != '/')
{
// resource names are using UNIX slashes (/)
resName.reserve(resName.size() + filename.native().size());
resName = mountPoint;
for (const char c : filename.string())
if (c != boost::filesystem::path::preferred_separator)
resName.push_back(c);
else
resName.push_back('/');
}
else
resName = mountPoint + filename.string();
fileList[ResourcePath(resName, type)] = std::move(filename);
}
}
return fileList;
}
VCMI_LIB_NAMESPACE_END
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