Method Extract

code/Common/ZipArchiveIOSystem.cpp:251–288

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// ----------------------------------------------------------------
ZipFile *ZipFileInfo::Extract(std::string &filename, unzFile zip_handle) const {
    // Find in the ZIP. This cannot fail
    unz_file_pos_s *filepos = const_cast<unz_file_pos_s *>(&(m_ZipFilePos));
    if (unzGoToFilePos(zip_handle, filepos) != UNZ_OK)
        return nullptr;

    if (unzOpenCurrentFile(zip_handle) != UNZ_OK)
        return nullptr;

    ZipFile *zip_file = new ZipFile(filename, m_Size);

    // Unzip has a limit of UINT16_MAX bytes buffer
    uint16_t unzipBufferSize = zip_file->m_Size <= UINT16_MAX ? static_cast<uint16_t>(zip_file->m_Size) : UINT16_MAX;
    std::unique_ptr<uint8_t[]> unzipBuffer = std::unique_ptr<uint8_t[]>(new uint8_t[unzipBufferSize]);
    size_t readCount = 0;
    while (readCount < zip_file->m_Size)
    {
        size_t bufferSize = zip_file->m_Size - readCount;
        if (bufferSize > UINT16_MAX) {
            bufferSize = UINT16_MAX;
        }

        int ret = unzReadCurrentFile(zip_handle, unzipBuffer.get(), static_cast<unsigned int>(bufferSize));
        if (ret != static_cast<int>(bufferSize))
        {
            // Failed, release the memory
            delete zip_file;
            zip_file = nullptr;
            break;
        }

        std::memcpy(zip_file->m_Buffer.get() + readCount, unzipBuffer.get(), ret);
        readCount += ret;
    }

    ai_assert(unzCloseCurrentFile(zip_handle) == UNZ_OK);
    return zip_file;
}

// ----------------------------------------------------------------
ZipFile::ZipFile(std::string &filename, size_t size) :