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/* ZipFile.cpp
Copyright (c) 2025 by tibetiroka
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ZipFile.h"
#include "Files.h"
#include <functional>
#include <numeric>
using namespace std;
ZipFile::ZipFile(const filesystem::path &zipPath)
: basePath(zipPath)
{
zipFile = unzOpen(basePath.string().c_str());
if(!zipFile)
throw runtime_error("Failed to open ZIP file" + zipPath.generic_string());
// Check whether this zip has a single top-level directory (such as high-dpi.zip/high-dpi)
filesystem::path topLevel;
for(const filesystem::path &path : ListFiles("", true, false))
{
filesystem::path zipPath = path.lexically_relative(basePath);
if(topLevel.empty())
topLevel = *zipPath.begin();
else if(*zipPath.begin() != topLevel)
return;
}
topLevelDirectory = topLevel;
}
ZipFile::~ZipFile()
{
if(zipFile)
{
unzClose(zipFile);
}
}
vector<filesystem::path> ZipFile::ListFiles(const filesystem::path &directory, bool recursive, bool directories) const
{
filesystem::path relative = GetPathInZip(directory);
vector<filesystem::path> fileList;
if(unzGoToFirstFile(zipFile) != UNZ_OK)
throw runtime_error("Failed to go to first file in ZIP");
do {
char filename[256];
unz_file_info fileInfo;
unzGetCurrentFileInfo(zipFile, &fileInfo, filename, sizeof(filename), NULL, 0, NULL, 0);
filesystem::path zipEntry = filename;
bool isDirectory = string(filename).back() == '/';
bool isValidSubtree = Files::IsParent(relative, zipEntry);
bool isRecursive = distance(zipEntry.begin(), zipEntry.end()) == distance(relative.begin(), relative.end()) + 1;
if(isValidSubtree && isDirectory == directories && (!isRecursive || recursive))
fileList.push_back(GetGlobalPath(zipEntry));
} while(unzGoToNextFile(zipFile) == UNZ_OK);
return fileList;
}
bool ZipFile::Exists(const filesystem::path &filePath) const
{
filesystem::path relative = GetPathInZip(filePath);
string name = relative.generic_string();
return unzLocateFile(zipFile, name.c_str(), 0) == UNZ_OK ||
unzLocateFile(zipFile, (name + "/").c_str(), 0) == UNZ_OK;
}
string ZipFile::ReadFile(const filesystem::path &filePath) const
{
filesystem::path relative = GetPathInZip(filePath);
if(unzLocateFile(zipFile, relative.generic_string().c_str(), 0) != UNZ_OK)
return {};
if(unzOpenCurrentFile(zipFile) != UNZ_OK)
return {};
unz_file_info64 info;
info.uncompressed_size = 0;
unzGetCurrentFileInfo64(zipFile, &info, nullptr, 0, nullptr, 0, nullptr, 0);
char buffer[8192];
string contents;
int bytesRead = 0;
while((bytesRead = unzReadCurrentFile(zipFile, buffer, sizeof(buffer))) > 0)
contents.append(buffer, bytesRead);
unzCloseCurrentFile(zipFile);
if(bytesRead < 0)
return {};
return contents;
}
filesystem::path ZipFile::GetPathInZip(const filesystem::path &path) const
{
filesystem::path relative = path.lexically_relative(basePath);
if(!topLevelDirectory.empty())
relative = topLevelDirectory / relative;
return relative;
}
filesystem::path ZipFile::GetGlobalPath(const filesystem::path &path) const
{
if(path.empty())
return path;
// If this zip has a top-level directory, remove it from the path.
if(!topLevelDirectory.empty())
return basePath / accumulate(std::next(path.begin()), path.end(), filesystem::path{}, std::divides{});
return basePath / path;
}
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