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# Array checking functions for Pyrex code that takes NumPy arrays
#
# The idea here is that many array functions:
# - Need to know the dimensions of their array inputs.
# - Require some dimensions of different arrays to match.
# - Don't ever need to consider a dimension of length 0.
#
# eg: x = y = z = 0
# dataA = checkArrayDouble2D(A, &x, &y)
# dataB = checkArrayDouble2D(B, &z, &x) # x must match
#
__version__ = "('1', '5', '3')"
cdef extern from "Python.h":
void *PyCObject_AsVoidPtr(object)
cdef extern from "array_interface.h":
struct PyArrayInterface:
int version
int nd
char typekind
int itemsize
int flags
int *shape, *strides
void *data
int CONTIGUOUS
ctypedef object ArrayType
cdef double *uncheckedArrayDouble(ArrayType A):
cdef PyArrayInterface *a
cobj = A.__array_struct__
a = <PyArrayInterface *> PyCObject_AsVoidPtr(cobj)
return <double *> a.data
cdef void *checkArray(ArrayType A, char typecode, int itemsize,
int nd, int **dims) except NULL:
cdef PyArrayInterface *a
cdef int length, size
cdef char kind
if A is None:
raise TypeError("Array required, got None")
cobj = A.__array_struct__
a = <PyArrayInterface *> PyCObject_AsVoidPtr(cobj)
if a.version != 2:
raise ValueError(
"Unexpected array interface version %s" % str(a.version))
cdef char typecode2
typecode2 = a.typekind
if typecode2 != typecode:
raise TypeError("'%s' type array required, got '%s'" %
(chr(typecode), chr(typecode2)))
if a.itemsize != itemsize:
raise TypeError("'%s%s' type array required, got '%s%s'" %
(chr(typecode), itemsize, chr(typecode2), a.itemsize))
if a.nd != nd:
raise ValueError("%s dimensional array required, got %s" %
(nd, a.nd))
if not a.flags & CONTIGUOUS:
raise ValueError ('Noncontiguous array')
cdef int dimension, val
cdef int *var
for dimension from 0 <= dimension < nd:
val = a.shape[dimension]
var = dims[dimension]
if var[0] == 0:
# Length unspecified, take it from the provided array
var[0] = val
elif var[0] != val:
# Length already specified, but not the same
raise ValueError("Dimension %s is %s, expected %s" %
(dimension, val, var[0]))
else:
# Length matches what was expected
pass
return a.data
cdef void *checkArray1D(ArrayType a, char typecode, int size,
int *x) except NULL:
cdef int *dims[1]
dims[0] = x
return checkArray(a, typecode, size, 1, dims)
cdef void *checkArray2D(ArrayType a, char typecode, int size,
int *x, int *y) except NULL:
cdef int *dims[2]
dims[0] = x
dims[1] = y
return checkArray(a, typecode, size, 2, dims)
cdef void *checkArray3D(ArrayType a, char typecode, int size,
int *x, int *y, int *z) except NULL:
cdef int *dims[3]
dims[0] = x
dims[1] = y
dims[2] = z
return checkArray(a, typecode, size, 3, dims)
cdef void *checkArray4D(ArrayType a, char typecode, int size,
int *w, int *x, int *y, int *z) except NULL:
cdef int *dims[4]
dims[0] = w
dims[1] = x
dims[2] = y
dims[3] = z
return checkArray(a, typecode, size, 4, dims)
cdef double * checkArrayDouble1D(ArrayType a, int *x) except NULL:
return <double *> checkArray1D(a, c'f', sizeof(double), x)
cdef double * checkArrayDouble2D(ArrayType a, int *x, int *y) except NULL:
return <double *> checkArray2D(a, c'f', sizeof(double), x, y)
cdef double * checkArrayDouble3D(ArrayType a, int *x, int *y, int *z) except NULL:
return <double *> checkArray3D(a, c'f', sizeof(double), x, y, z)
cdef double * checkArrayDouble4D(ArrayType a, int *w, int *x, int *y, int *z) except NULL:
return <double *> checkArray4D(a, c'f', sizeof(double), w, x, y, z)
cdef long * checkArrayLong1D(ArrayType a, int *x) except NULL:
return <long *> checkArray1D(a, c'i', sizeof(long), x)
cdef long * checkArrayLong2D(ArrayType a, int *x, int *y) except NULL:
return <long *> checkArray2D(a, c'i', sizeof(long), x, y)
cdef long * checkArrayLong3D(ArrayType a, int *x, int *y, int *z) except NULL:
return <long *> checkArray3D(a, c'i', sizeof(long), x, y, z)
cdef long * checkArrayLong4D(ArrayType a, int *w, int *x, int *y, int *z) except NULL:
return <long *> checkArray4D(a, c'i', sizeof(long), w, x, y, z)
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