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h5d.pyx
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h5d.pyx
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# This file is part of h5py, a Python interface to the HDF5 library.
#
# http://www.h5py.org
#
# Copyright 2008-2013 Andrew Collette and contributors
#
# License: Standard 3-clause BSD; see "license.txt" for full license terms
# and contributor agreement.
"""
Provides access to the low-level HDF5 "H5D" dataset interface.
"""
include "config.pxi"
# Compile-time imports
from _objects cimport pdefault
from numpy cimport ndarray, import_array, PyArray_DATA, NPY_WRITEABLE
from utils cimport check_numpy_read, check_numpy_write, \
convert_tuple, emalloc, efree
from h5t cimport TypeID, typewrap, py_create
from h5s cimport SpaceID
from h5p cimport PropID, propwrap
from _proxy cimport dset_rw
from h5py import _objects
from ._objects import phil, with_phil
# Initialization
import_array()
# === Public constants and data structures ====================================
COMPACT = H5D_COMPACT
CONTIGUOUS = H5D_CONTIGUOUS
CHUNKED = H5D_CHUNKED
ALLOC_TIME_DEFAULT = H5D_ALLOC_TIME_DEFAULT
ALLOC_TIME_LATE = H5D_ALLOC_TIME_LATE
ALLOC_TIME_EARLY = H5D_ALLOC_TIME_EARLY
ALLOC_TIME_INCR = H5D_ALLOC_TIME_INCR
SPACE_STATUS_NOT_ALLOCATED = H5D_SPACE_STATUS_NOT_ALLOCATED
SPACE_STATUS_PART_ALLOCATED = H5D_SPACE_STATUS_PART_ALLOCATED
SPACE_STATUS_ALLOCATED = H5D_SPACE_STATUS_ALLOCATED
FILL_TIME_ALLOC = H5D_FILL_TIME_ALLOC
FILL_TIME_NEVER = H5D_FILL_TIME_NEVER
FILL_TIME_IFSET = H5D_FILL_TIME_IFSET
FILL_VALUE_UNDEFINED = H5D_FILL_VALUE_UNDEFINED
FILL_VALUE_DEFAULT = H5D_FILL_VALUE_DEFAULT
FILL_VALUE_USER_DEFINED = H5D_FILL_VALUE_USER_DEFINED
IF HDF5_VERSION >= VDS_MIN_HDF5_VERSION:
VIRTUAL = H5D_VIRTUAL
VDS_FIRST_MISSING = H5D_VDS_FIRST_MISSING
VDS_LAST_AVAILABLE = H5D_VDS_LAST_AVAILABLE
# === Dataset operations ======================================================
@with_phil
def create(ObjectID loc not None, object name, TypeID tid not None,
SpaceID space not None, PropID dcpl=None, PropID lcpl=None, PropID dapl = None):
""" (objectID loc, STRING name or None, TypeID tid, SpaceID space,
PropDCID dcpl=None, PropID lcpl=None) => DatasetID
Create a new dataset. If "name" is None, the dataset will be
anonymous.
"""
cdef hid_t dsid
cdef char* cname = NULL
if name is not None:
cname = name
if cname != NULL:
dsid = H5Dcreate2(loc.id, cname, tid.id, space.id,
pdefault(lcpl), pdefault(dcpl), pdefault(dapl))
else:
dsid = H5Dcreate_anon(loc.id, tid.id, space.id,
pdefault(dcpl), pdefault(dapl))
return DatasetID(dsid)
@with_phil
def open(ObjectID loc not None, char* name, PropID dapl=None):
""" (ObjectID loc, STRING name, PropID dapl=None) => DatasetID
Open an existing dataset attached to a group or file object, by name.
If specified, dapl may be a dataset access property list.
"""
return DatasetID(H5Dopen2(loc.id, name, pdefault(dapl)))
# --- Proxy functions for safe(r) threading -----------------------------------
cdef class DatasetID(ObjectID):
"""
Represents an HDF5 dataset identifier.
Objects of this class may be used in any HDF5 function which expects
a dataset identifier. Also, all H5D* functions which take a dataset
instance as their first argument are presented as methods of this
class.
Properties:
dtype: Numpy dtype representing the dataset type
shape: Numpy-style shape tuple representing the dataspace
rank: Integer giving dataset rank
* Hashable: Yes, unless anonymous
* Equality: True HDF5 identity if unless anonymous
"""
property dtype:
""" Numpy dtype object representing the dataset type """
def __get__(self):
# Dataset type can't change
cdef TypeID tid
with phil:
if self._dtype is None:
tid = self.get_type()
self._dtype = tid.dtype
return self._dtype
property shape:
""" Numpy-style shape tuple representing the dataspace """
def __get__(self):
# Shape can change (DatasetID.extend), so don't cache it
cdef SpaceID sid
with phil:
sid = self.get_space()
return sid.get_simple_extent_dims()
property rank:
""" Integer giving the dataset rank (0 = scalar) """
def __get__(self):
cdef SpaceID sid
with phil:
sid = self.get_space()
return sid.get_simple_extent_ndims()
@with_phil
def read(self, SpaceID mspace not None, SpaceID fspace not None,
ndarray arr_obj not None, TypeID mtype=None,
PropID dxpl=None):
""" (SpaceID mspace, SpaceID fspace, NDARRAY arr_obj,
TypeID mtype=None, PropDXID dxpl=None)
Read data from an HDF5 dataset into a Numpy array.
It is your responsibility to ensure that the memory dataspace
provided is compatible with the shape of the Numpy array. Since a
wide variety of dataspace configurations are possible, this is not
checked. You can easily crash Python by reading in data from too
large a dataspace.
If a memory datatype is not specified, one will be auto-created
based on the array's dtype.
The provided Numpy array must be writable and C-contiguous. If
this is not the case, ValueError will be raised and the read will
fail. Keyword dxpl may be a dataset transfer property list.
"""
cdef hid_t self_id, mtype_id, mspace_id, fspace_id, plist_id
cdef void* data
cdef int oldflags
if mtype is None:
mtype = py_create(arr_obj.dtype)
check_numpy_write(arr_obj, -1)
self_id = self.id
mtype_id = mtype.id
mspace_id = mspace.id
fspace_id = fspace.id
plist_id = pdefault(dxpl)
data = PyArray_DATA(arr_obj)
dset_rw(self_id, mtype_id, mspace_id, fspace_id, plist_id, data, 1)
@with_phil
def write(self, SpaceID mspace not None, SpaceID fspace not None,
ndarray arr_obj not None, TypeID mtype=None,
PropID dxpl=None):
""" (SpaceID mspace, SpaceID fspace, NDARRAY arr_obj,
TypeID mtype=None, PropDXID dxpl=None)
Write data from a Numpy array to an HDF5 dataset. Keyword dxpl may
be a dataset transfer property list.
It is your responsibility to ensure that the memory dataspace
provided is compatible with the shape of the Numpy array. Since a
wide variety of dataspace configurations are possible, this is not
checked. You can easily crash Python by writing data from too
large a dataspace.
If a memory datatype is not specified, one will be auto-created
based on the array's dtype.
The provided Numpy array must be C-contiguous. If this is not the
case, ValueError will be raised and the read will fail.
"""
cdef hid_t self_id, mtype_id, mspace_id, fspace_id, plist_id
cdef void* data
cdef int oldflags
if mtype is None:
mtype = py_create(arr_obj.dtype)
check_numpy_read(arr_obj, -1)
self_id = self.id
mtype_id = mtype.id
mspace_id = mspace.id
fspace_id = fspace.id
plist_id = pdefault(dxpl)
data = PyArray_DATA(arr_obj)
dset_rw(self_id, mtype_id, mspace_id, fspace_id, plist_id, data, 0)
@with_phil
def extend(self, tuple shape):
""" (TUPLE shape)
Extend the given dataset so it's at least as big as "shape". Note
that a dataset may only be extended up to the maximum dimensions of
its dataspace, which are fixed when the dataset is created.
"""
cdef int rank
cdef hid_t space_id = 0
cdef hsize_t* dims = NULL
try:
space_id = H5Dget_space(self.id)
rank = H5Sget_simple_extent_ndims(space_id)
if len(shape) != rank:
raise TypeError("New shape length (%d) must match dataset rank (%d)" % (len(shape), rank))
dims = <hsize_t*>emalloc(sizeof(hsize_t)*rank)
convert_tuple(shape, dims, rank)
H5Dextend(self.id, dims)
finally:
efree(dims)
if space_id:
H5Sclose(space_id)
@with_phil
def set_extent(self, tuple shape):
""" (TUPLE shape)
Set the size of the dataspace to match the given shape. If the new
size is larger in any dimension, it must be compatible with the
maximum dataspace size.
"""
cdef int rank
cdef hid_t space_id = 0
cdef hsize_t* dims = NULL
try:
space_id = H5Dget_space(self.id)
rank = H5Sget_simple_extent_ndims(space_id)
if len(shape) != rank:
raise TypeError("New shape length (%d) must match dataset rank (%d)" % (len(shape), rank))
dims = <hsize_t*>emalloc(sizeof(hsize_t)*rank)
convert_tuple(shape, dims, rank)
H5Dset_extent(self.id, dims)
finally:
efree(dims)
if space_id:
H5Sclose(space_id)
@with_phil
def get_space(self):
""" () => SpaceID
Create and return a new copy of the dataspace for this dataset.
"""
return SpaceID(H5Dget_space(self.id))
@with_phil
def get_space_status(self):
""" () => INT space_status_code
Determine if space has been allocated for a dataset.
Return value is one of:
* SPACE_STATUS_NOT_ALLOCATED
* SPACE_STATUS_PART_ALLOCATED
* SPACE_STATUS_ALLOCATED
"""
cdef H5D_space_status_t status
H5Dget_space_status(self.id, &status)
return <int>status
@with_phil
def get_type(self):
""" () => TypeID
Create and return a new copy of the datatype for this dataset.
"""
return typewrap(H5Dget_type(self.id))
@with_phil
def get_create_plist(self):
""" () => PropDCID
Create an return a new copy of the dataset creation property list
used when this dataset was created.
"""
return propwrap(H5Dget_create_plist(self.id))
@with_phil
def get_access_plist(self):
""" () => PropDAID
Create an return a new copy of the dataset access property list.
"""
return propwrap(H5Dget_access_plist(self.id))
@with_phil
def get_offset(self):
""" () => LONG offset or None
Get the offset of this dataset in the file, in bytes, or None if
it doesn't have one. This is always the case for datasets which
use chunked storage, compact datasets, and datasets for which space
has not yet been allocated in the file.
"""
cdef haddr_t offset
offset = H5Dget_offset(self.id)
if offset == HADDR_UNDEF:
return None
return offset
@with_phil
def get_storage_size(self):
""" () => LONG storage_size
Determine the amount of file space required for a dataset. Note
this only counts the space which has actually been allocated; it
may even be zero.
"""
return H5Dget_storage_size(self.id)
IF HDF5_VERSION >= SWMR_MIN_HDF5_VERSION:
@with_phil
def flush(self):
""" no return
Flushes all buffers associated with a dataset to disk.
This function causes all buffers associated with a dataset to be
immediately flushed to disk without removing the data from the cache.
Use this in SWMR write mode to allow readers to be updated with the
dataset changes.
Feature requires: 1.9.178 HDF5
"""
H5Dflush(self.id)
@with_phil
def refresh(self):
""" no return
Refreshes all buffers associated with a dataset.
This function causes all buffers associated with a dataset to be
cleared and immediately re-loaded with updated contents from disk.
This function essentially closes the dataset, evicts all metadata
associated with it from the cache, and then re-opens the dataset.
The reopened dataset is automatically re-registered with the same ID.
Use this in SWMR read mode to poll for dataset changes.
Feature requires: 1.9.178 HDF5
"""
H5Drefresh(self.id)
IF HDF5_VERSION >= (1, 8, 11):
def write_direct_chunk(self, offsets, bytes data, H5Z_filter_t filter_mask=H5Z_FILTER_NONE, PropID dxpl=None):
""" (offsets, bytes data, H5Z_filter_t filter_mask=H5Z_FILTER_NONE, PropID dxpl=None)
Writes data from a bytes array (as provided e.g. by struct.pack) directly
to a chunk at position specified by the offsets argument.
Feature requires: 1.8.11 HDF5
"""
cdef hid_t dset_id
cdef hid_t dxpl_id
cdef hid_t space_id = 0
cdef hsize_t *offset = NULL
cdef size_t data_size
cdef int rank
dset_id = self.id
dxpl_id = pdefault(dxpl)
space_id = H5Dget_space(self.id)
rank = H5Sget_simple_extent_ndims(space_id)
if len(offsets) != rank:
raise TypeError("offset length (%d) must match dataset rank (%d)" % (len(offsets), rank))
try:
offset = <hsize_t*>emalloc(sizeof(hsize_t)*rank)
convert_tuple(offsets, offset, rank)
H5DOwrite_chunk(dset_id, dxpl_id, filter_mask, offset, len(data), <char *> data)
finally:
efree(offset)
if space_id:
H5Sclose(space_id)