Method dumpPropertyContent

src/App/PropertyContainerPyImp.cpp:522–585

PyObject* PropertyContainerPy::dumpPropertyContent(PyObject* args, PyObject* kwds) const
{
    int compression = 3;
    const char* property {};
    static const std::array<const char*, 3> kwds_def {"Property", "Compression", nullptr};
    PyErr_Clear();
    if (!Base::Wrapped_ParseTupleAndKeywords(args,
                                             kwds,
                                             "s|i",
                                             kwds_def,
                                             &property,
                                             &compression)) {
        return nullptr;
    }

    Property* prop = getPropertyContainerPtr()->getPropertyByName(property);
    if (!prop) {
        PyErr_Format(PyExc_AttributeError, "Property container has no property '%s'", property);
        return nullptr;
    }

    // setup the stream. the in flag is needed to make "read" work
    std::stringstream stream(std::stringstream::out | std::stringstream::in
                             | std::stringstream::binary);
    try {
        prop->dumpToStream(stream, compression);
    }
    catch (...) {
        PyErr_SetString(PyExc_IOError, "Unable to parse content into binary representation");
        return nullptr;
    }

    // build the byte array with correct size
    if (!stream.seekp(0, std::stringstream::end)) {
        PyErr_SetString(PyExc_IOError, "Unable to find end of stream");
        return nullptr;
    }

    std::stringstream::pos_type offset = stream.tellp();
    if (!stream.seekg(0, std::stringstream::beg)) {
        PyErr_SetString(PyExc_IOError, "Unable to find begin of stream");
        return nullptr;
    }

    PyObject* ba = PyByteArray_FromStringAndSize(nullptr, offset);

    // use the buffer protocol to access the underlying array and write into it
    Py_buffer buf = Py_buffer();
    PyObject_GetBuffer(ba, &buf, PyBUF_WRITABLE);
    try {
        if (!stream.read((char*)buf.buf, offset)) {
            PyErr_SetString(PyExc_IOError, "Error copying data into byte array");
            return nullptr;
        }
        PyBuffer_Release(&buf);
    }
    catch (...) {
        PyBuffer_Release(&buf);