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55577d0ac4
- use precalculated checksum for zip files - UNUSED macro to silence some warnings
210 lines
5.2 KiB
C++
210 lines
5.2 KiB
C++
#include "StdInc.h"
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#include "../../Global.h"
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#include "CZipLoader.h"
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#include "../ScopeGuard.h"
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/*
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* CZipLoader.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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CZipStream::CZipStream(const std::string & archive, unz_file_pos filepos)
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{
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file = unzOpen(archive.c_str());
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unzGoToFilePos(file, &filepos);
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unzOpenCurrentFile(file);
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}
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CZipStream::~CZipStream()
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{
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unzCloseCurrentFile(file);
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unzClose(file);
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}
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si64 CZipStream::readMore(ui8 * data, si64 size)
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{
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return unzReadCurrentFile(file, data, size);
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}
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si64 CZipStream::getSize()
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{
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unz_file_info info;
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unzGetCurrentFileInfo (file, &info, nullptr, 0, nullptr, 0, nullptr, 0);
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return info.uncompressed_size;
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}
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ui32 CZipStream::calculateCRC32()
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{
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unz_file_info info;
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unzGetCurrentFileInfo (file, &info, nullptr, 0, nullptr, 0, nullptr, 0);
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return info.crc;
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}
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CZipLoader::CZipLoader(const std::string & mountPoint, const std::string & archive):
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archiveName(archive),
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mountPoint(mountPoint),
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files(listFiles(mountPoint, archive))
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{
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logGlobal->traceStream() << "Zip archive loaded, " << files.size() << " files found";
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}
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std::unordered_map<ResourceID, unz_file_pos> CZipLoader::listFiles(const std::string & mountPoint, const std::string & archive)
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{
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std::unordered_map<ResourceID, unz_file_pos> ret;
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unzFile file = unzOpen(archive.c_str());
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if (unzGoToFirstFile(file) == UNZ_OK)
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{
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do
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{
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unz_file_info info;
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std::vector<char> filename;
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// Fill unz_file_info structure with current file info
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unzGetCurrentFileInfo (file, &info, nullptr, 0, nullptr, 0, nullptr, 0);
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filename.resize(info.size_filename);
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// Get name of current file. Contrary to docs "info" parameter can't be null
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unzGetCurrentFileInfo (file, &info, filename.data(), filename.size(), nullptr, 0, nullptr, 0);
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std::string filenameString(filename.data(), filename.size());
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unzGetFilePos(file, &ret[ResourceID(mountPoint + filenameString)]);
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}
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while (unzGoToNextFile(file) == UNZ_OK);
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}
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unzClose(file);
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return ret;
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}
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std::unique_ptr<CInputStream> CZipLoader::load(const ResourceID & resourceName) const
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{
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return std::unique_ptr<CInputStream>(new CZipStream(archiveName, files.at(resourceName)));
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}
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bool CZipLoader::existsResource(const ResourceID & resourceName) const
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{
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return files.count(resourceName) != 0;
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}
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std::string CZipLoader::getMountPoint() const
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{
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return mountPoint;
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}
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std::unordered_set<ResourceID> CZipLoader::getFilteredFiles(std::function<bool(const ResourceID &)> filter) const
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{
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std::unordered_set<ResourceID> foundID;
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for (auto & file : files)
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{
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if (filter(file.first))
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foundID.insert(file.first);
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}
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return foundID;
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}
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/// extracts currently selected file from zip into stream "where"
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static bool extractCurrent(unzFile file, std::ostream & where)
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{
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std::array<char, 8 * 1024> buffer;
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unzOpenCurrentFile(file);
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while (1)
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{
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int readSize = unzReadCurrentFile(file, buffer.data(), buffer.size());
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if (readSize < 0) // error
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break;
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if (readSize == 0) // end-of-file. Also performs CRC check
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return unzCloseCurrentFile(file) == UNZ_OK;
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if (readSize > 0) // successfull read
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{
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where.write(buffer.data(), readSize);
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if (!where.good())
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break;
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}
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}
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// extraction failed. Close file and exit
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unzCloseCurrentFile(file);
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return false;
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}
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std::vector<std::string> ZipArchive::listFiles(std::string filename)
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{
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std::vector<std::string> ret;
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unzFile file = unzOpen(filename.c_str());
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if (unzGoToFirstFile(file) == UNZ_OK)
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{
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do
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{
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unz_file_info info;
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std::vector<char> filename;
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unzGetCurrentFileInfo (file, &info, nullptr, 0, nullptr, 0, nullptr, 0);
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filename.resize(info.size_filename);
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// Get name of current file. Contrary to docs "info" parameter can't be null
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unzGetCurrentFileInfo (file, &info, filename.data(), filename.size(), nullptr, 0, nullptr, 0);
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ret.push_back(std::string(filename.data(), filename.size()));
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}
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while (unzGoToNextFile(file) == UNZ_OK);
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}
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unzClose(file);
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return ret;
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}
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bool ZipArchive::extract(std::string from, std::string where)
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{
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// Note: may not be fast enough for large archives (should NOT happen with mods)
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// because locating each file by name may be slow. Unlikely slower than decompression though
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return extract(from, where, listFiles(from));
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}
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bool ZipArchive::extract(std::string from, std::string where, std::vector<std::string> what)
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{
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unzFile archive = unzOpen(from.c_str());
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auto onExit = vstd::makeScopeGuard([&]()
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{
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unzClose(archive);
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});
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for (std::string & file : what)
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{
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if (unzLocateFile(archive, file.c_str(), 1) != UNZ_OK)
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return false;
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std::string fullName = where + '/' + file;
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std::string fullPath = fullName.substr(0, fullName.find_last_of("/"));
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boost::filesystem::create_directories(fullPath);
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// directory. No file to extract
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// TODO: better way to detect directory? Probably check return value of unzOpenCurrentFile?
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if (boost::algorithm::ends_with(file, "/"))
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continue;
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std::ofstream destFile(fullName, std::ofstream::binary);
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if (!destFile.good())
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return false;
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if (!extractCurrent(archive, destFile))
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return false;
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}
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return true;
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}
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