150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/////////////// ArrayAPI.proto ///////////////
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// arrayarray.h
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//
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// Artificial C-API for Python's <array.array> type,
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// used by array.pxd
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//
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// last changes: 2009-05-15 rk
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// 2012-05-02 andreasvc
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// (see revision control)
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//
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#ifndef _ARRAYARRAY_H
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#define _ARRAYARRAY_H
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// These two forward declarations are explicitly handled in the type
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// declaration code, as including them here is too late for cython-defined
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// types to use them.
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// struct arrayobject;
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// typedef struct arrayobject arrayobject;
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// All possible arraydescr values are defined in the vector "descriptors"
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// below. That's defined later because the appropriate get and set
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// functions aren't visible yet.
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typedef struct arraydescr {
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int typecode;
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int itemsize;
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PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
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int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
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#if PY_MAJOR_VERSION >= 3
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char *formats;
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#endif
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} arraydescr;
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struct arrayobject {
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PyObject_HEAD
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Py_ssize_t ob_size;
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union {
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char *ob_item;
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float *as_floats;
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double *as_doubles;
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int *as_ints;
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unsigned int *as_uints;
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unsigned char *as_uchars;
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signed char *as_schars;
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char *as_chars;
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unsigned long *as_ulongs;
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long *as_longs;
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#if PY_MAJOR_VERSION >= 3
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unsigned long long *as_ulonglongs;
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long long *as_longlongs;
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#endif
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short *as_shorts;
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unsigned short *as_ushorts;
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Py_UNICODE *as_pyunicodes;
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void *as_voidptr;
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} data;
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Py_ssize_t allocated;
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struct arraydescr *ob_descr;
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PyObject *weakreflist; /* List of weak references */
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#if PY_MAJOR_VERSION >= 3
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int ob_exports; /* Number of exported buffers */
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#endif
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};
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#ifndef NO_NEWARRAY_INLINE
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// fast creation of a new array
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static CYTHON_INLINE PyObject * newarrayobject(PyTypeObject *type, Py_ssize_t size,
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struct arraydescr *descr) {
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arrayobject *op;
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size_t nbytes;
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if (size < 0) {
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PyErr_BadInternalCall();
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return NULL;
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}
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nbytes = size * descr->itemsize;
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// Check for overflow
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if (nbytes / descr->itemsize != (size_t)size) {
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return PyErr_NoMemory();
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}
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op = (arrayobject *) type->tp_alloc(type, 0);
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if (op == NULL) {
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return NULL;
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}
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op->ob_descr = descr;
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op->allocated = size;
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op->weakreflist = NULL;
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op->ob_size = size;
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if (size <= 0) {
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op->data.ob_item = NULL;
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}
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else {
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op->data.ob_item = PyMem_NEW(char, nbytes);
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if (op->data.ob_item == NULL) {
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Py_DECREF(op);
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return PyErr_NoMemory();
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}
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}
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return (PyObject *) op;
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}
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#else
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PyObject* newarrayobject(PyTypeObject *type, Py_ssize_t size,
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struct arraydescr *descr);
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#endif /* ifndef NO_NEWARRAY_INLINE */
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// fast resize (reallocation to the point)
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// not designed for filing small increments (but for fast opaque array apps)
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static CYTHON_INLINE int resize(arrayobject *self, Py_ssize_t n) {
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void *items = (void*) self->data.ob_item;
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PyMem_Resize(items, char, (size_t)(n * self->ob_descr->itemsize));
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if (items == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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self->data.ob_item = (char*) items;
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self->ob_size = n;
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self->allocated = n;
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return 0;
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}
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// suitable for small increments; over allocation 50% ;
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static CYTHON_INLINE int resize_smart(arrayobject *self, Py_ssize_t n) {
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void *items = (void*) self->data.ob_item;
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Py_ssize_t newsize;
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if (n < self->allocated && n*4 > self->allocated) {
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self->ob_size = n;
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return 0;
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}
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newsize = n + (n / 2) + 1;
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if (newsize <= n) { /* overflow */
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PyErr_NoMemory();
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return -1;
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}
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PyMem_Resize(items, char, (size_t)(newsize * self->ob_descr->itemsize));
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if (items == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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self->data.ob_item = (char*) items;
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self->ob_size = n;
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self->allocated = newsize;
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return 0;
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}
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#endif
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/* _ARRAYARRAY_H */
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