Mac/Modules/cf/pycfbridge.c

/*
** Convert objects from Python to CoreFoundation and vice-versa.
*/

#include <CoreServices/CoreServices.h>

#include "Python.h"
#include "pymactoolbox.h"
#include "pycfbridge.h"


/* ---------------------------------------- */
/* CoreFoundation objects to Python objects */
/* ---------------------------------------- */

PyObject *
PyCF_CF2Python(CFTypeRef src) {
    CFTypeID typeid;

    if( src == NULL ) {
        Py_INCREF(Py_None);
        return Py_None;
    }
    typeid = CFGetTypeID(src);
    if (typeid == CFArrayGetTypeID())
        return PyCF_CF2Python_sequence((CFArrayRef)src);
    if (typeid == CFDictionaryGetTypeID())
        return PyCF_CF2Python_mapping((CFDictionaryRef)src);
    return PyCF_CF2Python_simple(src);
}

PyObject *
PyCF_CF2Python_sequence(CFArrayRef src) {
    int size = CFArrayGetCount(src);
    PyObject *rv;
    CFTypeRef item_cf;
    PyObject *item_py = NULL;
    int i;

    if ( (rv=PyList_New(size)) == NULL )
        return NULL;
    for(i=0; i<size; i++) {
        item_cf = CFArrayGetValueAtIndex(src, i);
        if (item_cf == NULL ) goto err;
        item_py = PyCF_CF2Python(item_cf);
        if (item_py == NULL ) goto err;
        if (PyList_SetItem(rv, i, item_py) < 0) goto err;
        item_py = NULL;
    }
    return rv;
err:
    Py_XDECREF(item_py);
    Py_DECREF(rv);
    return NULL;
}

PyObject *
PyCF_CF2Python_mapping(CFTypeRef src) {
    int size = CFDictionaryGetCount(src);
    PyObject *rv = NULL;
    CFTypeRef *allkeys = NULL, *allvalues = NULL;
    CFTypeRef key_cf, value_cf;
    PyObject *key_py = NULL, *value_py = NULL;
    int i;

    allkeys = malloc(size*sizeof(CFTypeRef *));
    if (allkeys == NULL) {
        PyErr_NoMemory();
        goto err;
    }
    allvalues = malloc(size*sizeof(CFTypeRef *));
    if (allvalues == NULL) {
        PyErr_NoMemory();
        goto err;
    }
    if ( (rv=PyDict_New()) == NULL ) goto err;
    CFDictionaryGetKeysAndValues(src, allkeys, allvalues);
    for(i=0; i<size; i++) {
        key_cf = allkeys[i];
        value_cf = allvalues[i];
        key_py = PyCF_CF2Python(key_cf);
        if (key_py == NULL ) goto err;
        value_py = PyCF_CF2Python(value_cf);
        if (value_py == NULL ) goto err;
        if (PyDict_SetItem(rv, key_py, value_py) < 0) goto err;
        key_py = NULL;
        value_py = NULL;
    }
    return rv;
err:
    Py_XDECREF(key_py);
    Py_XDECREF(value_py);
    Py_XDECREF(rv);
    free(allkeys);
    free(allvalues);
    return NULL;
}

PyObject *
PyCF_CF2Python_simple(CFTypeRef src) {
    CFTypeID typeid;

    typeid = CFGetTypeID(src);
    if (typeid == CFStringGetTypeID())
        return PyCF_CF2Python_string((CFStringRef)src);
    if (typeid == CFBooleanGetTypeID())
        return PyBool_FromLong((long)CFBooleanGetValue(src));
    if (typeid == CFNumberGetTypeID()) {
        if (CFNumberIsFloatType(src)) {
            double d;
            CFNumberGetValue(src, kCFNumberDoubleType, &d);
            return PyFloat_FromDouble(d);
        } else {
            long l;
            if (!CFNumberGetValue(src, kCFNumberLongType, &l))
                /* XXXX Out of range! */;
            return PyInt_FromLong(l);
        }
    }
    /* XXXX Should return as CFTypeRef, really... */
    PyMac_Error(resNotFound);
    return NULL;
}

/* Unsure - Return unicode or 8 bit strings? */
PyObject *
PyCF_CF2Python_string(CFStringRef src) {
    int size = CFStringGetLength(src)+1;
    Py_UNICODE *data = malloc(size*sizeof(Py_UNICODE));
    CFRange range;
    PyObject *rv;

    range.location = 0;
    range.length = size;
    if( data == NULL ) return PyErr_NoMemory();
    CFStringGetCharacters(src, range, data);
    rv = (PyObject *)PyUnicode_FromUnicode(data, size-1);
    free(data);
    return rv;
}

/* ---------------------------------------- */
/* Python objects to CoreFoundation objects */
/* ---------------------------------------- */

int
PyCF_Python2CF(PyObject *src, CFTypeRef *dst) {

    if (PyString_Check(src) || PyUnicode_Check(src))
        return PyCF_Python2CF_simple(src, dst);
    if (PySequence_Check(src))
        return PyCF_Python2CF_sequence(src, (CFArrayRef *)dst);
    if (PyMapping_Check(src))
        return PyCF_Python2CF_mapping(src, (CFDictionaryRef *)dst);
    return PyCF_Python2CF_simple(src, dst);
}

int
PyCF_Python2CF_sequence(PyObject *src, CFArrayRef *dst) {
    CFMutableArrayRef rv = NULL;
    CFTypeRef item_cf = NULL;
    PyObject *item_py = NULL;
    int size, i;

    if( !PySequence_Check(src) ) {
        PyErr_Format(PyExc_TypeError,
            "Cannot convert %.500s objects to CFArray",
            src->ob_type->tp_name);
        return 0;
    }
    size = PySequence_Size(src);
    rv = CFArrayCreateMutable((CFAllocatorRef)NULL, size, &kCFTypeArrayCallBacks);
    if (rv == NULL) {
        PyMac_Error(resNotFound);
        goto err;
    }

    for( i=0; i<size; i++) {
        item_py = PySequence_GetItem(src, i);
        if (item_py == NULL) goto err;
        if ( !PyCF_Python2CF(item_py, &item_cf)) goto err;
        Py_DECREF(item_py);
        CFArraySetValueAtIndex(rv, i, item_cf);
        CFRelease(item_cf);
        item_cf = NULL;
    }
    *dst = rv;
    return 1;
err:
    Py_XDECREF(item_py);
    if (rv) CFRelease(rv);
    if (item_cf) CFRelease(item_cf);
    return 0;
}

int
PyCF_Python2CF_mapping(PyObject *src, CFDictionaryRef *dst) {
    CFMutableDictionaryRef rv = NULL;
    PyObject *aslist = NULL;
    CFTypeRef key_cf = NULL, value_cf = NULL;
    PyObject *item_py = NULL, *key_py = NULL, *value_py = NULL;
    int size, i;

    if( !PyMapping_Check(src) ) {
        PyErr_Format(PyExc_TypeError,
            "Cannot convert %.500s objects to CFDictionary",
            src->ob_type->tp_name);
        return 0;
    }
    size = PyMapping_Size(src);
    rv = CFDictionaryCreateMutable((CFAllocatorRef)NULL, size,
                                    &kCFTypeDictionaryKeyCallBacks,
                                    &kCFTypeDictionaryValueCallBacks);
    if (rv == NULL) {
        PyMac_Error(resNotFound);
        goto err;
    }
    if ( (aslist = PyMapping_Items(src)) == NULL ) goto err;

    for( i=0; i<size; i++) {
        item_py = PySequence_GetItem(aslist, i);
        if (item_py == NULL) goto err;
        if (!PyArg_ParseTuple(item_py, "OO", &key_py, &value_py)) goto err;
        if ( !PyCF_Python2CF(key_py, &key_cf) ) goto err;
        if ( !PyCF_Python2CF(value_py, &value_cf) ) goto err;
        CFDictionaryAddValue(rv, key_cf, value_cf);
        CFRelease(key_cf);
        key_cf = NULL;
        CFRelease(value_cf);
        value_cf = NULL;
    }
    *dst = rv;
    return 1;
err:
    Py_XDECREF(item_py);
    Py_XDECREF(aslist);
    if (rv) CFRelease(rv);
    if (key_cf) CFRelease(key_cf);
    if (value_cf) CFRelease(value_cf);
    return 0;
}

int
PyCF_Python2CF_simple(PyObject *src, CFTypeRef *dst) {

#if 0
    if (PyObject_HasAttrString(src, "CFType")) {
        *dst = PyObject_CallMethod(src, "CFType", "");
        return (*dst != NULL);
    }
#endif
    if (PyString_Check(src) || PyUnicode_Check(src))
        return PyCF_Python2CF_string(src, (CFStringRef *)dst);
    if (PyBool_Check(src)) {
        if (src == Py_True)
            *dst = kCFBooleanTrue;
        else
            *dst = kCFBooleanFalse;
        return 1;
    }
    if (PyInt_Check(src)) {
        long v = PyInt_AsLong(src);
        *dst = CFNumberCreate(NULL, kCFNumberLongType, &v);
        return 1;
    }
    if (PyFloat_Check(src)) {
        double d = PyFloat_AsDouble(src);
        *dst = CFNumberCreate(NULL, kCFNumberDoubleType, &d);
        return 1;
    }

    PyErr_Format(PyExc_TypeError,
              "Cannot convert %.500s objects to CFType",
                                 src->ob_type->tp_name);
    return 0;
}

int
PyCF_Python2CF_string(PyObject *src, CFStringRef *dst) {
    char *chars;
    CFIndex size;
    UniChar *unichars;

    if (PyString_Check(src)) {
        if (!PyArg_Parse(src, "es", "ascii", &chars))
            return 0; /* This error is more descriptive than the general one below */
        *dst = CFStringCreateWithCString((CFAllocatorRef)NULL, chars, kCFStringEncodingASCII);
        PyMem_Free(chars);
        return 1;
    }
    if (PyUnicode_Check(src)) {
        /* We use the CF types here, if Python was configured differently that will give an error */
        size = PyUnicode_GetSize(src);
        if ((unichars = PyUnicode_AsUnicode(src)) == NULL ) goto err;
        *dst = CFStringCreateWithCharacters((CFAllocatorRef)NULL, unichars, size);
        return 1;
    }
err:
    PyErr_Format(PyExc_TypeError,
              "Cannot convert %.500s objects to CFString",
                                 src->ob_type->tp_name);
    return 0;
}