OpenEXR.cpp

//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//

#define PY_SSIZE_T_CLEAN // required for Py_BuildValue("s#") for Python 3.10
#include <Python.h>

#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#    define PY_SSIZE_T_MAX INT_MAX
#    define PY_SSIZE_T_MIN INT_MIN
#endif

#if PY_MAJOR_VERSION >= 3
#    define MOD_ERROR_VAL NULL
#    define MOD_SUCCESS_VAL(val) val
#    define MOD_INIT(name) PyMODINIT_FUNC PyInit_##name (void)
#    define MOD_DEF(ob, name, doc, methods)                                    \
        static struct PyModuleDef moduledef = {                                \
            PyModuleDef_HEAD_INIT,                                             \
            name,                                                              \
            doc,                                                               \
            -1,                                                                \
            methods,                                                           \
        };                                                                     \
        ob = PyModule_Create (&moduledef);
#    define PyInt_FromLong(x) PyLong_FromLong (x)
#    define PyInt_AsLong(x) PyLong_AsLong (x)
#    define PyInt_Check(x) PyLong_Check (x)
#    define PyString_Check(x) PyBytes_Check (x)
#    define PyString_AsString(x) PyBytes_AsString (x)
#    define PyString_Size(x) PyBytes_Size (x)
#    define PyString_FromString(x) PyBytes_FromString (x)
#    define PyString_FromStringAndSize(x, y) PyBytes_FromStringAndSize (x, y)
#    define PyUTF8_AsSstring(x) PyString_AsString (PyUnicode_AsUTF8String (x))
#    define PyUTF8_FromSstring(x) Something...
#else
#    define MOD_ERROR_VAL
#    define MOD_SUCCESS_VAL(val)
#    define MOD_INIT(name) extern "C" void init##name (void)
#    define MOD_DEF(ob, name, doc, methods)                                    \
        ob = Py_InitModule3 (name, methods, doc);
#    define PyUTF8_AsSstring(x) PyString_AsString (x)
#endif

#include <ImfIO.h>
#include <Iex.h>
#include <ImfArray.h>
#include <ImfAttribute.h>
#include <ImfBoxAttribute.h>
#include <ImfChannelList.h>
#include <ImfStandardAttributes.h>
#include <ImfChannelListAttribute.h>
#include <ImfChromaticitiesAttribute.h>
#include <ImfCompressionAttribute.h>
#include <ImfDoubleAttribute.h>
#include <ImfEnvmapAttribute.h>
#include <ImfFloatAttribute.h>
#include <ImfFrameBuffer.h>
#include <ImfHeader.h>
#include <ImfInputFile.h>
#include <ImfIntAttribute.h>
#include <ImfKeyCodeAttribute.h>
#include <ImfLineOrderAttribute.h>
#include <ImfMatrixAttribute.h>
#include <ImfOutputFile.h>
#include <ImfPreviewImageAttribute.h>
#include <ImfStringAttribute.h>
#include <ImfTileDescriptionAttribute.h>
#include <ImfTiledOutputFile.h>
#include <ImfTimeCodeAttribute.h>
#include <ImfVecAttribute.h>
#include <ImfVersion.h>

#include <ImfRationalAttribute.h>
#include <ImfRational.h>
#include <ImfKeyCodeAttribute.h>
#include <ImfKeyCode.h>
#include <ImfTimeCodeAttribute.h>
#include <ImfTimeCode.h>

#include <string>
#include <fstream>
#include <iostream>
#include <iomanip>
#include <iostream>
#include <vector>

#define IMATH_VERSION                                                          \
    IMATH_VERSION_MAJOR * 10000 + IMATH_VERSION_MINOR * 100 +                  \
        IMATH_VERSION_PATCH

#if IMATH_VERSION >= 30001
#    define Int64 uint64_t
#    define SInt64 int64_t
#endif

using namespace std;
using namespace OPENEXR_IMF_NAMESPACE;
using namespace IMATH_NAMESPACE;

static PyObject* OpenEXR_error = NULL;
static PyObject* pModuleImath;

static PyObject*
PyObject_StealAttrString (PyObject* o, const char* name)
{
    PyObject* r = PyObject_GetAttrString (o, name);
    Py_DECREF (r);
    return r;
}

static PyObject*
PyObject_Call1 (PyObject* f, PyObject* a)
{
    PyObject* r = PyObject_CallObject (f, a);
    Py_DECREF (a);
    return r;
}

/** @brief split a string in a list of them
 * @param str The string to split
 * @param sep The separator
 * @return The list of strings
 */
static std::vector<std::string>
split (const std::string& str, const char sep)
{
    std::stringstream        spliter (str);
    std::string              token;
    std::vector<std::string> words;
    while (std::getline (spliter, token, sep))
    {
        if (token.size ()) words.push_back (token);
    }
    return words;
}

////////////////////////////////////////////////////////////////////////
//    Istream and Ostream derivatives
////////////////////////////////////////////////////////////////////////

class C_IStream : public IStream
{
public:
    C_IStream (PyObject* fo) : IStream (""), _fo (fo) {}
    virtual bool        read (char c[], int n);
    virtual Int64       tellg ();
    virtual void        seekg (Int64 pos);
    virtual void        clear ();
    virtual const char* fileName () const;

private:
    PyObject* _fo;
};

bool
C_IStream::read (char c[], int n)
{
    PyObject* data =
        PyObject_CallMethod (_fo, (char*) "read", (char*) "(i)", n);
    if (data != NULL && PyString_AsString (data) &&
        PyString_Size (data) == (Py_ssize_t) n)
    {
        memcpy (c, PyString_AsString (data), PyString_Size (data));
        Py_DECREF (data);
    }
    else { throw IEX_NAMESPACE::InputExc ("file read failed"); }
    return 0;
}

const char*
C_IStream::fileName () const
{
    return "xxx";
}

Int64
C_IStream::tellg ()
{
    PyObject* rv = PyObject_CallMethod (_fo, (char*) "tell", NULL);
    if (rv != NULL && PyNumber_Check (rv))
    {
        PyObject* lrv = PyNumber_Long (rv);
        long long t   = PyLong_AsLong (lrv);
        Py_DECREF (lrv);
        Py_DECREF (rv);
        return (Int64) t;
    }
    else { throw IEX_NAMESPACE::InputExc ("tell failed"); }
}

void
C_IStream::seekg (Int64 pos)
{
    PyObject* data =
        PyObject_CallMethod (_fo, (char*) "seek", (char*) "(L)", pos);
    if (data != NULL) { Py_DECREF (data); }
    else { throw IEX_NAMESPACE::InputExc ("seek failed"); }
}

void
C_IStream::clear ()
{}

////////////////////////////////////////////////////////////////////////

class C_OStream : public OStream
{
public:
    C_OStream (PyObject* fo) : OStream (""), _fo (fo) {}
    virtual void        write (const char* c, int n);
    virtual Int64       tellp ();
    virtual void        seekp (Int64 pos);
    virtual void        clear ();
    virtual const char* fileName () const;

private:
    PyObject* _fo;
};

void
C_OStream::write (const char* c, int n)
{
    PyObject* data =
        PyObject_CallMethod (_fo, (char*) "write", (char*) "(s#)", c, n);
    if (data != NULL) { Py_DECREF (data); }
    else { throw IEX_NAMESPACE::InputExc ("file write failed"); }
}

const char*
C_OStream::fileName () const
{
    return "xxx";
}

Int64
C_OStream::tellp ()
{
    PyObject* rv = PyObject_CallMethod (_fo, (char*) "tell", NULL);
    if (rv != NULL && PyNumber_Check (rv))
    {
        PyObject* lrv = PyNumber_Long (rv);
        long long t   = PyLong_AsLong (lrv);
        Py_DECREF (lrv);
        Py_DECREF (rv);
        return (Int64) t;
    }
    else { throw IEX_NAMESPACE::InputExc ("tell failed"); }
}

void
C_OStream::seekp (Int64 pos)
{
    PyObject* data =
        PyObject_CallMethod (_fo, (char*) "seek", (char*) "(L)", pos);
    if (data != NULL) { Py_DECREF (data); }
    else { throw IEX_NAMESPACE::InputExc ("seek failed"); }
}

void
C_OStream::clear ()
{}

////////////////////////////////////////////////////////////////////////
//    InputFile
////////////////////////////////////////////////////////////////////////

typedef struct
{
    PyObject_HEAD InputFile i;
    PyObject*               fo;
    C_IStream*              istream;
    int                     is_opened;
} InputFileC;

static PyObject*
channel (PyObject* self, PyObject* args, PyObject* kw)
{
    InputFile* file = &((InputFileC*) self)->i;

    Box2i dw = file->header ().dataWindow ();
    int   miny, maxy;

    miny = dw.min.y;
    maxy = dw.max.y;

    char*     cname;
    PyObject* pixel_type = NULL;
    char*     keywords[] = {
        (char*) "cname",
        (char*) "pixel_type",
        (char*) "scanLine1",
        (char*) "scanLine2",
        NULL};
    if (!PyArg_ParseTupleAndKeywords (
            args, kw, "s|Oii", keywords, &cname, &pixel_type, &miny, &maxy))
        return NULL;

    if (maxy < miny)
    {
        PyErr_SetString (PyExc_TypeError, "scanLine1 must be <= scanLine2");
        return NULL;
    }
    if (miny < dw.min.y)
    {
        PyErr_SetString (
            PyExc_TypeError, "scanLine1 cannot be outside dataWindow");
        return NULL;
    }
    if (maxy > dw.max.y)
    {
        PyErr_SetString (
            PyExc_TypeError, "scanLine2 cannot be outside dataWindow");
        return NULL;
    }

    ChannelList channels   = file->header ().channels ();
    Channel*    channelPtr = channels.findChannel (cname);
    if (channelPtr == NULL)
    {
        return PyErr_Format (
            PyExc_TypeError, "There is no channel '%s' in the image", cname);
    }

    Imf::PixelType pt;
    if (pixel_type != NULL)
    {
        if (PyObject_GetAttrString (pixel_type, "v") == NULL)
        {
            return PyErr_Format (PyExc_TypeError, "Invalid PixelType object");
        }
        pt = PixelType (
            PyLong_AsLong (PyObject_StealAttrString (pixel_type, "v")));
    }
    else { pt = channelPtr->type; }

    int xSampling = channelPtr->xSampling;
    int ySampling = channelPtr->ySampling;
    int width     = (dw.max.x - dw.min.x + 1) / xSampling;
    int height    = (maxy - miny + 1) / ySampling;

    size_t typeSize;
    switch (pt)
    {
        case HALF: typeSize = 2; break;

        case FLOAT:
        case UINT: typeSize = 4; break;

        default: PyErr_SetString (PyExc_TypeError, "Unknown type"); return NULL;
    }
    PyObject* r = PyString_FromStringAndSize (NULL, typeSize * width * height);

    char* pixels = PyString_AsString (r);

    try
    {
        FrameBuffer frameBuffer;
        size_t      xstride = typeSize;
        size_t      ystride = typeSize * width;
        frameBuffer.insert (
            cname,
            Slice (
                pt,
                pixels - dw.min.x * xstride / xSampling -
                    miny * ystride / ySampling,
                xstride,
                ystride,
                xSampling,
                ySampling,
                0.0));
        file->setFrameBuffer (frameBuffer);
        file->readPixels (miny, maxy);
    }
    catch (const std::exception& e)
    {
        PyErr_SetString (PyExc_IOError, e.what ());
        return NULL;
    }

    return r;
}

static PyObject*
channels (PyObject* self, PyObject* args, PyObject* kw)
{
    InputFile* file = &((InputFileC*) self)->i;

    Box2i dw = file->header ().dataWindow ();
    int   miny, maxy;

    miny = dw.min.y;
    maxy = dw.max.y;

    PyObject* clist;
    PyObject* pixel_type = NULL;
    char*     keywords[] = {
        (char*) "cnames",
        (char*) "pixel_type",
        (char*) "scanLine1",
        (char*) "scanLine2",
        NULL};
    if (!PyArg_ParseTupleAndKeywords (
            args, kw, "O|Oii", keywords, &clist, &pixel_type, &miny, &maxy))
        return NULL;

    if (maxy < miny)
    {
        PyErr_SetString (PyExc_TypeError, "scanLine1 must be <= scanLine2");
        return NULL;
    }
    if (miny < dw.min.y)
    {
        PyErr_SetString (
            PyExc_TypeError, "scanLine1 cannot be outside dataWindow");
        return NULL;
    }
    if (maxy > dw.max.y)
    {
        PyErr_SetString (
            PyExc_TypeError, "scanLine2 cannot be outside dataWindow");
        return NULL;
    }

    ChannelList channels = file->header ().channels ();
    FrameBuffer frameBuffer;

    int width  = dw.max.x - dw.min.x + 1;
    int height = maxy - miny + 1;

    PyObject* retval   = PyList_New (0);
    PyObject* iterator = PyObject_GetIter (clist);
    if (iterator == NULL)
    {
        PyErr_SetString (PyExc_TypeError, "Channel list must be iterable");
        return NULL;
    }
    PyObject* item;

    while ((item = PyIter_Next (iterator)) != NULL)
    {
        char*    cname      = PyUTF8_AsSstring (item);
        Channel* channelPtr = channels.findChannel (cname);
        if (channelPtr == NULL)
        {
            return PyErr_Format (
                PyExc_TypeError,
                "There is no channel '%s' in the image",
                cname);
        }

        Imf::PixelType pt;
        if (pixel_type != NULL)
        {
            pt = PixelType (
                PyLong_AsLong (PyObject_StealAttrString (pixel_type, "v")));
        }
        else { pt = channelPtr->type; }

        // Use pt to compute typeSize
        size_t typeSize;
        switch (pt)
        {
            case HALF: typeSize = 2; break;

            case FLOAT:
            case UINT: typeSize = 4; break;

            default:
                PyErr_SetString (PyExc_TypeError, "Unknown type");
                return NULL;
        }

        size_t xstride = typeSize;
        size_t ystride = typeSize * width;

        PyObject* r =
            PyString_FromStringAndSize (NULL, typeSize * width * height);
        PyList_Append (retval, r);
        Py_DECREF (r);

        char* pixels = PyString_AsString (r);

        try
        {
            frameBuffer.insert (
                cname,
                Slice (
                    pt,
                    pixels - dw.min.x * xstride - miny * ystride,
                    xstride,
                    ystride,
                    1,
                    1,
                    0.0));
        }
        catch (const std::exception& e)
        {
            PyErr_SetString (PyExc_IOError, e.what ());
            return NULL;
        }
        Py_DECREF (item);
    }
    Py_DECREF (iterator);
    file->setFrameBuffer (frameBuffer);
    file->readPixels (miny, maxy);

    return retval;
}
static PyObject*
inclose (PyObject* self, PyObject* args)
{
    InputFileC* pc = ((InputFileC*) self);
    if (pc->is_opened)
    {
        pc->is_opened   = 0;
        InputFile* file = &((InputFileC*) self)->i;
        file->~InputFile ();
    }
    Py_RETURN_NONE;
}

static PyObject*
dict_from_header (Header h)
{
    PyObject* object;

    object = PyDict_New ();

    PyObject* pV2FFunc   = PyObject_GetAttrString (pModuleImath, "V2f");
    PyObject* pChanFunc  = PyObject_GetAttrString (pModuleImath, "Channel");
    PyObject* pPTFunc    = PyObject_GetAttrString (pModuleImath, "PixelType");
    PyObject* pBoxFunc   = PyObject_GetAttrString (pModuleImath, "Box2i");
    PyObject* pPointFunc = PyObject_GetAttrString (pModuleImath, "point");
    PyObject* pPIFunc = PyObject_GetAttrString (pModuleImath, "PreviewImage");
    PyObject* pLOFunc = PyObject_GetAttrString (pModuleImath, "LineOrder");
    PyObject* pCFunc  = PyObject_GetAttrString (pModuleImath, "Compression");
    PyObject* pCHFunc = PyObject_GetAttrString (pModuleImath, "chromaticity");
    PyObject* pCHSFunc =
        PyObject_GetAttrString (pModuleImath, "Chromaticities");
    PyObject* pLevelMode = PyObject_GetAttrString (pModuleImath, "LevelMode");
    PyObject* pLevelRoundingMode =
        PyObject_GetAttrString (pModuleImath, "LevelRoundingMode");
    PyObject* pTileDescription =
        PyObject_GetAttrString (pModuleImath, "TileDescription");
    PyObject* pRationalFunc = PyObject_GetAttrString (pModuleImath, "Rational");
    PyObject* pKeyCodeFunc  = PyObject_GetAttrString (pModuleImath, "KeyCode");
    PyObject* pTimeCodeFunc = PyObject_GetAttrString (pModuleImath, "TimeCode");

    for (Header::ConstIterator i = h.begin (); i != h.end (); ++i)
    {
        const Attribute* a  = &i.attribute ();
        PyObject*        ob = NULL;

        // cout << i.name() << " (type " << a->typeName() << ")\n";
        if (const Box2iAttribute* ta = dynamic_cast<const Box2iAttribute*> (a))
        {

            PyObject* ptargs[2];
            ptargs[0] =
                Py_BuildValue ("ii", ta->value ().min.x, ta->value ().min.y);
            ptargs[1] =
                Py_BuildValue ("ii", ta->value ().max.x, ta->value ().max.y);
            PyObject* pt[2];
            pt[0]             = PyObject_CallObject (pPointFunc, ptargs[0]);
            pt[1]             = PyObject_CallObject (pPointFunc, ptargs[1]);
            PyObject* boxArgs = Py_BuildValue ("NN", pt[0], pt[1]);

            ob = PyObject_CallObject (pBoxFunc, boxArgs);
            Py_DECREF (boxArgs);
            Py_DECREF (ptargs[0]);
            Py_DECREF (ptargs[1]);
        }
        else if (
            const KeyCodeAttribute* ka =
                dynamic_cast<const KeyCodeAttribute*> (a))
        {
            PyObject* args = Py_BuildValue (
                "iiiiiii",
                ka->value ().filmMfcCode (),
                ka->value ().filmType (),
                ka->value ().prefix (),
                ka->value ().count (),
                ka->value ().perfOffset (),
                ka->value ().perfsPerFrame (),
                ka->value ().perfsPerCount ());
            ob = PyObject_CallObject (pKeyCodeFunc, args);
            Py_DECREF (args);
        }
        else if (
            const TimeCodeAttribute* ta =
                dynamic_cast<const TimeCodeAttribute*> (a))
        {
            PyObject* args = Py_BuildValue (
                "iiiiiiiiiiiiiiiiii",
                ta->value ().hours (),
                ta->value ().minutes (),
                ta->value ().seconds (),
                ta->value ().frame (),
                ta->value ().dropFrame (),
                ta->value ().colorFrame (),
                ta->value ().fieldPhase (),
                ta->value ().bgf0 (),
                ta->value ().bgf1 (),
                ta->value ().bgf2 (),
                ta->value ().binaryGroup (1),
                ta->value ().binaryGroup (2),
                ta->value ().binaryGroup (3),
                ta->value ().binaryGroup (4),
                ta->value ().binaryGroup (5),
                ta->value ().binaryGroup (6),
                ta->value ().binaryGroup (7),
                ta->value ().binaryGroup (8));
            ob = PyObject_CallObject (pTimeCodeFunc, args);
            Py_DECREF (args);
        }
        else if (
            const RationalAttribute* ra =
                dynamic_cast<const RationalAttribute*> (a))
        {
            PyObject* args =
                Py_BuildValue ("ii", ra->value ().n, ra->value ().d);
            ob = PyObject_CallObject (pRationalFunc, args);
            Py_DECREF (args);
        }
        else if (
            const PreviewImageAttribute* pia =
                dynamic_cast<const PreviewImageAttribute*> (a))
        {
            int size = pia->value ().width () * pia->value ().height () * 4;
#if PY_MAJOR_VERSION >= 3
            const char fmt[] = "iiy#";
#else
            const char fmt[] = "iis#";
#endif
            PyObject* args = Py_BuildValue (
                fmt,
                pia->value ().width (),
                pia->value ().height (),
                (char*) pia->value ().pixels (),
                size);
            ob = PyObject_CallObject (pPIFunc, args);

            Py_DECREF (args);
        }
        else if (
            const LineOrderAttribute* ta =
                dynamic_cast<const LineOrderAttribute*> (a))
        {
            PyObject* args = PyTuple_Pack (1, PyInt_FromLong (ta->value ()));
            ob             = PyObject_CallObject (pLOFunc, args);
            Py_DECREF (args);
        }
        else if (
            const CompressionAttribute* ta =
                dynamic_cast<const CompressionAttribute*> (a))
        {
            PyObject* args = PyTuple_Pack (1, PyInt_FromLong (ta->value ()));
            ob             = PyObject_CallObject (pCFunc, args);
            Py_DECREF (args);
        }
        else if (
            const ChannelListAttribute* ta =
                dynamic_cast<const ChannelListAttribute*> (a))
        {
            const ChannelList cl = ta->value ();
            PyObject*         CS = PyDict_New ();
            for (ChannelList::ConstIterator j = cl.begin (); j != cl.end ();
                 ++j)
            {
                PyObject* ptarg   = Py_BuildValue ("(i)", j.channel ().type);
                PyObject* pt      = PyObject_CallObject (pPTFunc, ptarg);
                PyObject* chanarg = Py_BuildValue (
                    "Nii", pt, j.channel ().xSampling, j.channel ().ySampling);
                PyObject* C = PyObject_CallObject (pChanFunc, chanarg);
                PyDict_SetItemString (CS, j.name (), C);
                Py_DECREF (C);
                Py_DECREF (ptarg);
                Py_DECREF (chanarg);
            }
            ob = CS;
        }
        else if (
            const FloatAttribute* ta = dynamic_cast<const FloatAttribute*> (a))
        {
            ob = PyFloat_FromDouble (ta->value ());
        }
        else if (const IntAttribute* ta = dynamic_cast<const IntAttribute*> (a))
        {
            ob = PyInt_FromLong (ta->value ());
        }
        else if (const V2fAttribute* ta = dynamic_cast<const V2fAttribute*> (a))
        {
            PyObject* args =
                Py_BuildValue ("ff", ta->value ().x, ta->value ().y);
            ob = PyObject_CallObject (pV2FFunc, args);
            Py_DECREF (args);
        }
        else if (
            const StringAttribute* ta =
                dynamic_cast<const StringAttribute*> (a))
        {
            ob = PyString_FromString (ta->value ().c_str ());
        }
        else if (
            const TileDescriptionAttribute* ta =
                dynamic_cast<const TileDescriptionAttribute*> (a))
        {
            const TileDescription td = ta->value ();
            PyObject*             m =
                PyObject_Call1 (pLevelMode, Py_BuildValue ("(i)", td.mode));
            PyObject* r = PyObject_Call1 (
                pLevelRoundingMode, Py_BuildValue ("(i)", td.roundingMode));
            ob = PyObject_Call1 (
                pTileDescription,
                Py_BuildValue ("(iiNN)", td.xSize, td.ySize, m, r));
        }
        else if (
            const ChromaticitiesAttribute* ta =
                dynamic_cast<const ChromaticitiesAttribute*> (a))
        {
            const Chromaticities& ch (ta->value ());
            PyObject*             rgbwargs[4];
            rgbwargs[0] = Py_BuildValue ("ff", ch.red[0], ch.red[1]);
            rgbwargs[1] = Py_BuildValue ("ff", ch.green[0], ch.green[1]);
            rgbwargs[2] = Py_BuildValue ("ff", ch.blue[0], ch.blue[1]);
            rgbwargs[3] = Py_BuildValue ("ff", ch.white[0], ch.white[1]);
            PyObject* chromas[4];
            chromas[0]      = PyObject_CallObject (pCHFunc, rgbwargs[0]);
            chromas[1]      = PyObject_CallObject (pCHFunc, rgbwargs[1]);
            chromas[2]      = PyObject_CallObject (pCHFunc, rgbwargs[2]);
            chromas[3]      = PyObject_CallObject (pCHFunc, rgbwargs[3]);
            PyObject* cargs = Py_BuildValue (
                "NNNN", chromas[0], chromas[1], chromas[2], chromas[3]);
            ob = PyObject_CallObject (pCHSFunc, cargs);
            Py_DECREF (cargs);
            Py_DECREF (rgbwargs[0]);
            Py_DECREF (rgbwargs[1]);
            Py_DECREF (rgbwargs[2]);
            Py_DECREF (rgbwargs[3]);
#ifdef INCLUDED_IMF_STRINGVECTOR_ATTRIBUTE_H
        }
        else if (
            const StringVectorAttribute* ta =
                dynamic_cast<const StringVectorAttribute*> (a))
        {
            StringVector sv = ta->value ();
            ob              = PyList_New (sv.size ());
            for (size_t i = 0; i < sv.size (); i++)
                PyList_SetItem (ob, i, PyString_FromString (sv[i].c_str ()));
#endif
        }
        else
        {
            // Unknown type for this object, so set its value to None.
            // printf("Baffled by type %s\n", a->typeName());
            ob = Py_None;
            Py_INCREF (ob);
        }
        PyDict_SetItemString (object, i.name (), ob);
        Py_DECREF (ob);
    }

    Py_DECREF (pV2FFunc);
    Py_DECREF (pChanFunc);
    Py_DECREF (pPTFunc);
    Py_DECREF (pBoxFunc);
    Py_DECREF (pPointFunc);
    Py_DECREF (pPIFunc);
    Py_DECREF (pLOFunc);
    Py_DECREF (pCFunc);
    Py_DECREF (pLevelMode);
    Py_DECREF (pLevelRoundingMode);
    Py_DECREF (pTileDescription);
    Py_DECREF (pRationalFunc);
    Py_DECREF (pKeyCodeFunc);
    Py_DECREF (pTimeCodeFunc);

    return object;
}

static PyObject*
inheader (PyObject* self, PyObject* args)
{
    InputFile* file = &((InputFileC*) self)->i;
    return dict_from_header (file->header ());
}

static PyObject*
isComplete (PyObject* self, PyObject* args)
{
    InputFile* file = &((InputFileC*) self)->i;
    return PyBool_FromLong (file->isComplete ());
}

/* Method table */
static PyMethodDef InputFile_methods[] = {
    {"header", inheader, METH_VARARGS},
    {"channel", (PyCFunction) channel, METH_VARARGS | METH_KEYWORDS},
    {"channels", (PyCFunction) channels, METH_VARARGS | METH_KEYWORDS},
    {"close", inclose, METH_VARARGS},
    {"isComplete", isComplete, METH_VARARGS},
    {NULL, NULL},
};

static void
InputFile_dealloc (PyObject* self)
{
    InputFileC* object = ((InputFileC*) self);
    if (object->fo) Py_DECREF (object->fo);
    Py_DECREF (inclose (self, NULL));
    PyObject_Del (self);
}

static PyObject*
InputFile_Repr (PyObject* self)
{
    //PyObject *result = NULL;
    char buf[50];

    sprintf (buf, "InputFile represented");
    return PyUnicode_FromString (buf);
}

static PyTypeObject InputFile_Type = {
    PyVarObject_HEAD_INIT (&PyType_Type, 0) "OpenEXR.InputFile",
    sizeof (InputFileC),
    0,
    (destructor) InputFile_dealloc,
    0,
    0,
    0,
    0,
    (reprfunc) InputFile_Repr,
    0, //&InputFile_as_number,
    0, //&InputFile_as_sequence,
    0,

    0,
    0,
    0,
    0,
    0,

    0,

    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,

    "OpenEXR Input file object",

    0,
    0,
    0,
    0,
    0,
    0,

    InputFile_methods

    /* the rest are NULLs */
};

int
makeInputFile (PyObject* self, PyObject* args, PyObject* kwds)
{
    InputFileC* object = ((InputFileC*) self);
    PyObject*   fo;
    char*       filename = NULL;

    if (PyArg_ParseTuple (args, "O:InputFile", &fo))
    {
        if (PyString_Check (fo))
        {
            filename        = PyString_AsString (fo);
            object->fo      = NULL;
            object->istream = NULL;
        }
        else if (PyUnicode_Check (fo))
        {
            filename        = PyUTF8_AsSstring (fo);
            object->fo      = NULL;
            object->istream = NULL;
        }
        else
        {
            object->fo = fo;
            Py_INCREF (fo);
            object->istream = new C_IStream (fo);
        }
    }
    else { return -1; }

    try
    {
        if (filename != NULL)
            new (&object->i) InputFile (filename);
        else
            new (&object->i) InputFile (*object->istream);
    }
    catch (const std::exception& e)
    {
        // Py_DECREF(object);
        PyErr_SetString (PyExc_IOError, e.what ());
        return -1;
    }
    object->is_opened = 1;

    return 0;
}

////////////////////////////////////////////////////////////////////////
//    OutputFile
////////////////////////////////////////////////////////////////////////

typedef struct
{
    PyObject_HEAD OutputFile o;
    C_OStream*               ostream;
    PyObject*                fo;
    int                      is_opened;
} OutputFileC;

static void
releaseviews (std::vector<Py_buffer>& views)
{
    for (size_t i = 0; i < views.size (); i++)
        PyBuffer_Release (&views[i]);
}

static PyObject*
outwrite (PyObject* self, PyObject* args)
{
    OutputFile* file = &((OutputFileC*) self)->o;

    // long height = PyLong_AsLong(PyTuple_GetItem(args, 1));
    Box2i     dw     = file->header ().dataWindow ();
    int       width  = dw.max.x - dw.min.x + 1;
    int       height = dw.max.y - dw.min.y + 1;
    PyObject* pixeldata;

    if (!PyArg_ParseTuple (
            args, "O!|i:writePixels", &PyDict_Type, &pixeldata, &height))
        return NULL;

    int currentScanLine = file->currentScanLine ();
    if (file->header ().lineOrder () == DECREASING_Y)
    {
        // With DECREASING_Y, currentScanLine() returns the maximum Y value of
        // the window on the first call, and decrements at each scan line.
        // We have to adjust to point to the correct address in the client buffer.
        currentScanLine = dw.max.y - currentScanLine + dw.min.y;
    }

    FrameBuffer            frameBuffer;
    std::vector<Py_buffer> views;

    const ChannelList& channels = file->header ().channels ();
    for (ChannelList::ConstIterator i = channels.begin (); i != channels.end ();
         ++i)
    {
        PyObject* channel_spec =
            PyDict_GetItem (pixeldata, PyUnicode_FromString (i.name ()));
        if (channel_spec != NULL)
        {
            Imf::PixelType pt       = i.channel ().type;
            int            typeSize = 4;
            switch (pt)
            {
                case HALF: typeSize = 2; break;

                case FLOAT:
                case UINT: typeSize = 4; break;

                default: break;
            }
            int   xSampling = i.channel ().xSampling;
            int   ySampling = i.channel ().ySampling;
            int   yStride   = typeSize * width;
            char* srcPixels;
            int   expectedSize = (height * yStride) / (xSampling * ySampling);
            Py_ssize_t bufferSize;

            if (PyString_Check (channel_spec))
            {
                bufferSize = PyString_Size (channel_spec);
                srcPixels  = PyString_AsString (channel_spec);
            }
            else if (PyObject_CheckBuffer (channel_spec))
            {
                Py_buffer view;
                if (PyObject_GetBuffer (channel_spec, &view, PyBUF_CONTIG_RO) !=
                    0)
                {
                    releaseviews (views);
                    PyErr_Format (
                        PyExc_TypeError,
                        "Unsupported buffer structure for channel '%s'",
                        i.name ());
                    return NULL;
                }
                views.push_back (view);
                bufferSize = view.len;
                srcPixels  = (char*) view.buf;
            }
            else
            {
                releaseviews (views);
                PyErr_Format (
                    PyExc_TypeError,
                    "Data for channel '%s' must be a string or support buffer protocol",
                    i.name ());
                return NULL;
            }

            if (bufferSize != expectedSize)
            {
                releaseviews (views);
                PyErr_Format (
                    PyExc_TypeError,
                    "Data for channel '%s' should have size %zu but got %zu",
                    i.name (),
                    expectedSize,
                    bufferSize);
                return NULL;
            }

            frameBuffer.insert (
                i.name (), // name
                Slice (
                    pt, // type
                    srcPixels - dw.min.x * typeSize / xSampling -
                        currentScanLine * yStride / ySampling, // base
                    typeSize,                                  // xStride
                    yStride,                                   // yStride
                    xSampling,
                    ySampling)); // subsampling
        }
    }

    try
    {
        file->setFrameBuffer (frameBuffer);
        file->writePixels (height);
    }
    catch (const std::exception& e)
    {
        releaseviews (views);
        PyErr_SetString (PyExc_IOError, e.what ());
        return NULL;
    }
    releaseviews (views);
    Py_RETURN_NONE;
}

static PyObject*
outcurrentscanline (PyObject* self, PyObject* args)
{
    OutputFile* file = &((OutputFileC*) self)->o;
    return PyLong_FromLong (file->currentScanLine ());
}

static PyObject*
outclose (PyObject* self, PyObject* args)
{
    OutputFileC* oc = (OutputFileC*) self;
    if (oc->is_opened)
    {
        oc->is_opened    = 0;
        OutputFile* file = &oc->o;
        file->~OutputFile ();
    }
    Py_RETURN_NONE;
}

/* Method table */
static PyMethodDef OutputFile_methods[] = {
    {"writePixels", outwrite, METH_VARARGS},
    {"currentScanLine", outcurrentscanline, METH_VARARGS},
    {"close", outclose, METH_VARARGS},
    {NULL, NULL},
};

static void
OutputFile_dealloc (PyObject* self)
{
    OutputFileC* object = ((OutputFileC*) self);
    if (object->fo) Py_DECREF (object->fo);
    Py_DECREF (outclose (self, NULL));
    PyObject_Del (self);
}

static PyObject*
OutputFile_Repr (PyObject* self)
{
    //PyObject *result = NULL;
    char buf[50];

    sprintf (buf, "OutputFile represented");
    return PyUnicode_FromString (buf);
}

static PyTypeObject OutputFile_Type = {
    PyVarObject_HEAD_INIT (&PyType_Type, 0) "OpenEXR.OutputFile",
    sizeof (OutputFileC),
    0,
    (destructor) OutputFile_dealloc,
    0,
    0,
    0,
    0,
    (reprfunc) OutputFile_Repr,
    0, //&InputFile_as_number,
    0, //&InputFile_as_sequence,
    0,

    0,
    0,
    0,
    0,
    0,

    0,

    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,

    "OpenEXR Output file object",

    0,
    0,
    0,
    0,
    0,
    0,

    OutputFile_methods

    /* the rest are NULLs */
};

int
makeOutputFile (PyObject* self, PyObject* args, PyObject* kwds)
{
    PyObject* fo;
    PyObject* header_dict;

    char* filename = NULL;

    OutputFileC* object = (OutputFileC*) self;

    if (PyArg_ParseTuple (
            args, "OO!:OutputFile", &fo, &PyDict_Type, &header_dict))
    {
        if (PyString_Check (fo))
        {
            filename        = PyString_AsString (fo);
            object->fo      = NULL;
            object->ostream = NULL;
        }
        else if (PyUnicode_Check (fo))
        {
            filename        = PyUTF8_AsSstring (fo);
            object->fo      = NULL;
            object->ostream = NULL;
        }
        else
        {
            object->fo = fo;
            Py_INCREF (fo);
            object->ostream = new C_OStream (fo);
        }
    }
    else { return -1; }

    Header header (64, 64);

    PyObject* pB2i  = PyObject_GetAttrString (pModuleImath, "Box2i");
    PyObject* pB2f  = PyObject_GetAttrString (pModuleImath, "Box2f");
    PyObject* pV2f  = PyObject_GetAttrString (pModuleImath, "V2f");
    PyObject* pLO   = PyObject_GetAttrString (pModuleImath, "LineOrder");
    PyObject* pCOMP = PyObject_GetAttrString (pModuleImath, "Compression");
    PyObject* pPI   = PyObject_GetAttrString (pModuleImath, "PreviewImage");
    PyObject* pCH   = PyObject_GetAttrString (pModuleImath, "Chromaticities");
    PyObject* pTD   = PyObject_GetAttrString (pModuleImath, "TileDescription");
    PyObject* pRA   = PyObject_GetAttrString (pModuleImath, "Rational");
    PyObject* pKA   = PyObject_GetAttrString (pModuleImath, "KeyCode");
    PyObject* pTC   = PyObject_GetAttrString (pModuleImath, "TimeCode");

    Py_ssize_t pos = 0;
    PyObject * key, *value;

    while (PyDict_Next (header_dict, &pos, &key, &value))
    {
        const char* ks = PyUTF8_AsSstring (key);
        if (PyFloat_Check (value))
        {
            header.insert (ks, FloatAttribute (PyFloat_AsDouble (value)));
        }
        else if (PyInt_Check (value))
        {
            header.insert (ks, IntAttribute (PyInt_AsLong (value)));
        }
        else if (PyBytes_Check (value))
        {
            header.insert (ks, StringAttribute (PyString_AsString (value)));
        }
        else if (PyObject_IsInstance (value, pB2i))
        {
            Box2i box (
                V2i (
                    PyLong_AsLong (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "min"), "x")),
                    PyLong_AsLong (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "min"), "y"))),
                V2i (
                    PyLong_AsLong (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "max"), "x")),
                    PyLong_AsLong (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "max"), "y"))));
            header.insert (ks, Box2iAttribute (box));
        }
        else if (PyObject_IsInstance (value, pB2f))
        {
            Box2f box (
                V2f (
                    PyFloat_AsDouble (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "min"), "x")),
                    PyFloat_AsDouble (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "min"), "y"))),
                V2f (
                    PyFloat_AsDouble (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "max"), "x")),
                    PyFloat_AsDouble (PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "max"), "y"))));
            header.insert (ks, Box2fAttribute (box));
        }
        else if (PyObject_IsInstance (value, pPI))
        {
            PreviewImage pi (
                PyLong_AsLong (PyObject_StealAttrString (value, "width")),
                PyLong_AsLong (PyObject_StealAttrString (value, "height")),
                (Imf::PreviewRgba*) PyString_AsString (
                    PyObject_StealAttrString (value, "pixels")));
            header.insert (ks, PreviewImageAttribute (pi));
        }
        else if (PyObject_IsInstance (value, pV2f))
        {
            V2f v (
                PyFloat_AsDouble (PyObject_StealAttrString (value, "x")),
                PyFloat_AsDouble (PyObject_StealAttrString (value, "y")));

            header.insert (ks, V2fAttribute (v));
        }
        else if (PyObject_IsInstance (value, pLO))
        {
            LineOrder i = (LineOrder) PyInt_AsLong (
                PyObject_StealAttrString (value, "v"));

            header.insert (ks, LineOrderAttribute (i));
        }
        else if (PyObject_IsInstance (value, pTC))
        {
            TimeCode v (
                PyLong_AsLong (PyObject_StealAttrString (value, "hours")),
                PyLong_AsLong (PyObject_StealAttrString (value, "minutes")),
                PyLong_AsLong (PyObject_StealAttrString (value, "seconds")),
                PyLong_AsLong (PyObject_StealAttrString (value, "frame")),
                PyLong_AsLong (PyObject_StealAttrString (value, "dropFrame")),
                PyLong_AsLong (PyObject_StealAttrString (value, "colorFrame")),
                PyLong_AsLong (PyObject_StealAttrString (value, "fieldPhase")),
                PyLong_AsLong (PyObject_StealAttrString (value, "bgf0")),
                PyLong_AsLong (PyObject_StealAttrString (value, "bgf1")),
                PyLong_AsLong (PyObject_StealAttrString (value, "bgf2")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup1")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup2")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup3")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup4")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup5")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup6")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup7")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "binaryGroup8")));

            header.insert (ks, TimeCodeAttribute (v));
        }
        else if (PyObject_IsInstance (value, pKA))
        {
            KeyCode v (
                PyLong_AsLong (PyObject_StealAttrString (value, "filmMfcCode")),
                PyLong_AsLong (PyObject_StealAttrString (value, "filmType")),
                PyLong_AsLong (PyObject_StealAttrString (value, "prefix")),
                PyLong_AsLong (PyObject_StealAttrString (value, "count")),
                PyLong_AsLong (PyObject_StealAttrString (value, "perfOffset")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "perfsPerFrame")),
                PyLong_AsLong (
                    PyObject_StealAttrString (value, "perfsPerCount")));
            header.insert (ks, KeyCodeAttribute (v));
        }
        else if (PyObject_IsInstance (value, pRA))
        {
            Rational v (
                PyLong_AsLong (PyObject_StealAttrString (value, "n")),
                PyLong_AsLong (PyObject_StealAttrString (value, "d")));
            header.insert (ks, RationalAttribute (v));
        }
        else if (PyObject_IsInstance (value, pCOMP))
        {
            Compression i = (Compression) PyInt_AsLong (
                PyObject_StealAttrString (value, "v"));

            header.insert (ks, CompressionAttribute (i));
        }
        else if (PyObject_IsInstance (value, pCH))
        {
            V2f red (
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "red"), "x")),
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "red"), "y")));
            V2f green (
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "green"), "x")),
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "green"), "y")));
            V2f blue (
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "blue"), "x")),
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "blue"), "y")));
            V2f white (
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "white"), "x")),
                PyFloat_AsDouble (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "white"), "y")));
            Chromaticities c (red, green, blue, white);
            header.insert (ks, ChromaticitiesAttribute (c));
        }
        else if (PyObject_IsInstance (value, pTD))
        {
            TileDescription td (
                PyInt_AsLong (PyObject_StealAttrString (value, "xSize")),
                PyInt_AsLong (PyObject_StealAttrString (value, "ySize")),
                (Imf::LevelMode) PyInt_AsLong (PyObject_StealAttrString (
                    PyObject_StealAttrString (value, "mode"), "v")),
                (Imf::LevelRoundingMode) PyInt_AsLong (
                    PyObject_StealAttrString (
                        PyObject_StealAttrString (value, "roundingMode"),
                        "v")));
            header.insert (ks, TileDescriptionAttribute (td));
        }
        else if (PyDict_Check (value))
        {
            PyObject * key2, *value2;
            Py_ssize_t pos2 = 0;

            while (PyDict_Next (value, &pos2, &key2, &value2))
            {
                if (0)
                    printf (
                        "%s -> %s\n",
                        PyString_AsString (key2),
                        PyString_AsString (
                            PyObject_Str (PyObject_Type (value2))));
                header.channels ().insert (
                    PyUTF8_AsSstring (key2),
                    Channel (
                        PixelType (PyLong_AsLong (PyObject_StealAttrString (
                            PyObject_StealAttrString (value2, "type"), "v"))),
                        PyLong_AsLong (
                            PyObject_StealAttrString (value2, "xSampling")),
                        PyLong_AsLong (
                            PyObject_StealAttrString (value2, "ySampling"))));
            }
#ifdef INCLUDED_IMF_STRINGVECTOR_ATTRIBUTE_H
        }
        else if (PyList_Check (value))
        {
            StringVector sv (PyList_Size (value));
            for (size_t i = 0; i < sv.size (); i++)
                sv[i] = PyUTF8_AsSstring (PyList_GetItem (value, i));
            header.insert (ks, StringVectorAttribute (sv));
#endif
        }
        else
        {
            printf (
                "XXX - unknown attribute: %s\n",
                PyUTF8_AsSstring (PyObject_Str (key)));
        }
    }

    Py_DECREF (pB2i);
    Py_DECREF (pB2f);
    Py_DECREF (pV2f);
    Py_DECREF (pLO);
    Py_DECREF (pCOMP);
    Py_DECREF (pPI);
    Py_DECREF (pCH);
    Py_DECREF (pTD);
    Py_DECREF (pRA);
    Py_DECREF (pKA);
    Py_DECREF (pTC);

    try
    {
        if (filename != NULL)
            new (&object->o) OutputFile (filename, header);
        else
            new (&object->o) OutputFile (*object->ostream, header);
    }
    catch (const std::exception& e)
    {
        PyErr_SetString (PyExc_IOError, e.what ());
        return -1;
    }
    object->is_opened = 1;
    return 0;
}

////////////////////////////////////////////////////////////////////////

PyObject*
makeHeader (PyObject* self, PyObject* args)
{
    int         w, h;
    const char* channels = "R,G,B";
    if (!PyArg_ParseTuple (args, "ii|s:Header", &w, &h, &channels)) return NULL;
    Header header (w, h);
    for (auto channel: split (channels, ','))
    {
        header.channels ().insert (channel.c_str (), Channel (FLOAT));
    }
    return dict_from_header (header);
}

////////////////////////////////////////////////////////////////////////

static bool
isOpenExrFile (const char fileName[])
{
    std::ifstream f (fileName, std::ios_base::binary);
    char          bytes[4];
    f.read (bytes, sizeof (bytes));
    return !!f && Imf::isImfMagic (bytes);
}

PyObject*
_isOpenExrFile (PyObject* self, PyObject* args)
{
    char* filename;
    if (!PyArg_ParseTuple (args, "s:isOpenExrFile", &filename)) return NULL;
    return PyBool_FromLong (isOpenExrFile (filename));
}

#ifdef VERSION_HAS_ISTILED
PyObject*
_isTiledOpenExrFile (PyObject* self, PyObject* args)
{
    char* filename;
    if (!PyArg_ParseTuple (args, "s:isTiledOpenExrFile", &filename))
        return NULL;
    return PyBool_FromLong (isTiledOpenExrFile (filename));
}
#endif

////////////////////////////////////////////////////////////////////////

static PyMethodDef methods[] = {
    {"Header", makeHeader, METH_VARARGS},
    {"isOpenExrFile", _isOpenExrFile, METH_VARARGS},
#ifdef VERSION_HAS_ISTILED
    {"isTiledOpenExrFile", _isTiledOpenExrFile, METH_VARARGS},
#endif
    {NULL, NULL},
};

MOD_INIT (OpenEXR)
{
    PyObject *m, *d, *item;

    Imf::staticInitialize ();

    MOD_DEF (m, "OpenEXR", "", methods)
    d = PyModule_GetDict (m);

    pModuleImath = PyImport_ImportModule ("Imath");

    /* initialize module variables/constants */
    InputFile_Type.tp_new   = PyType_GenericNew;
    InputFile_Type.tp_init  = makeInputFile;
    OutputFile_Type.tp_new  = PyType_GenericNew;
    OutputFile_Type.tp_init = makeOutputFile;
    if (PyType_Ready (&InputFile_Type) != 0) return MOD_ERROR_VAL;
    if (PyType_Ready (&OutputFile_Type) != 0) return MOD_ERROR_VAL;
    PyModule_AddObject (m, "InputFile", (PyObject*) &InputFile_Type);
    PyModule_AddObject (m, "OutputFile", (PyObject*) &OutputFile_Type);

#if PYTHON_API_VERSION >= 1007
    OpenEXR_error = PyErr_NewException ((char*) "OpenEXR.error", NULL, NULL);
#else
    OpenEXR_error = PyString_FromString ("OpenEXR.error");
#endif
    PyDict_SetItemString (d, "error", OpenEXR_error);
    Py_DECREF (OpenEXR_error);

    PyDict_SetItemString (d, "UINT", item = PyLong_FromLong (UINT));
    Py_DECREF (item);
    PyDict_SetItemString (d, "HALF", item = PyLong_FromLong (HALF));
    Py_DECREF (item);
    PyDict_SetItemString (d, "FLOAT", item = PyLong_FromLong (FLOAT));
    Py_DECREF (item);

    return MOD_SUCCESS_VAL (m);
}