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R8218/private/h5attput.m
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h5attput.m
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function h5attput ( h5file, varargin )
% H5ATTPUT Add HDF5 attribute to existing file.
%
% H5ATTPUT(HDFFILE,VARNAME,ATTNAME,ATTVALUE) creates/overwrites the
% attribute named ATTNAME with the value ATTVALUE. The parent object
% VARNAME can be either an HDF5 variable or group. VARNAME must be a
% complete pathname.
%
% H5ATTPUT(HDFFILE,ATTNAME,ATTVALUE) does the same thing, but the
% complete path to the parent object is embedded within ATTNAME.
%
% Simple strings will be created in a scalar dataspace.
% Copyright 2008-2011 The MathWorks, Inc.
narginchk(3,4)
nargoutchk(0,0)
[varname, attname, attvalue] = parse_and_validate_inputs ( h5file, varargin{:} );
flags = 'H5F_ACC_RDWR';
plist_id = 'H5P_DEFAULT';
file_id = H5F.open ( h5file, flags, plist_id );
[parent_id, parent_obj_is_group] = set_parent_id ( file_id, varname );
dataspace_id = set_dataspace_id ( attvalue );
datatype_id = set_datatype_id ( attvalue );
att_id = set_attribute_id ( parent_id, attname, datatype_id, dataspace_id );
H5A.write(att_id,datatype_id,attvalue);
H5T.close(datatype_id);
H5S.close(dataspace_id);
H5A.close(att_id);
if parent_obj_is_group
H5G.close(parent_id);
else
H5D.close(parent_id);
end
H5F.close(file_id);
%===============================================================================
% SET_ATTRIBUTE_ID
%
% Setup the attribute ID. We need to check as to whether or not the attribute
% already exists.
function att_id = set_attribute_id ( parent_id, attname, datatype_id, dataspace_id )
try
att_id = H5A.open_name ( parent_id, attname );
catch
att_id = H5A.create ( parent_id, attname, datatype_id, dataspace_id,'H5P_DEFAULT' );
end
%===============================================================================
% SET_DATASPACE_ID
%
% Setup the dataspace ID. This just depends on how many elements the
% attribute actually has.
function dataspace_id = set_dataspace_id ( attvalue )
if ischar(attvalue)
dataspace_id = H5S.create('H5S_SCALAR');
else
dims = size(attvalue);
if (dims(1) ~= numel(attvalue))
rank = ndims(attvalue);
dims = fliplr(size(attvalue));
else
rank = 1;
dims = dims(1);
end
dataspace_id = H5S.create_simple ( rank, dims, dims );
end
%===============================================================================
% SET_PARENT_ID
%
% If the given variable is "/", then we know we are creating a group attribute.
% Otherwise try to open the variable as a dataset. If that fails, then it
% must be a subgroup.
function [parent_id, parent_obj_is_group] = set_parent_id ( file_id, varname )
if strcmp(varname,'/')
parent_obj_is_group = true;
parent_id = H5G.open ( file_id, varname );
else
try
parent_id=H5D.open(file_id,varname);
parent_obj_is_group = false;
catch
parent_id = H5G.open ( file_id, varname );
parent_obj_is_group = true;
end
end
%===============================================================================
% SET_DATATYPE_ID
%
% We need to choose an appropriate HDF5 datatype based upon the attribute
% data.
function datatype_id = set_datatype_id ( attvalue )
switch class(attvalue)
case 'double'
datatype_id = H5T.copy('H5T_NATIVE_DOUBLE');
case 'single'
datatype_id = H5T.copy('H5T_NATIVE_FLOAT');
case 'int64'
datatype_id = H5T.copy('H5T_NATIVE_LLONG');
case 'uint64'
datatype_id = H5T.copy('H5T_NATIVE_ULLONG');
case 'int32'
datatype_id = H5T.copy('H5T_NATIVE_INT');
case 'uint32'
datatype_id = H5T.copy('H5T_NATIVE_UINT');
case 'int16'
datatype_id = H5T.copy('H5T_NATIVE_SHORT');
case 'uint16'
datatype_id = H5T.copy('H5T_NATIVE_USHORT');
case 'int8'
datatype_id = H5T.copy('H5T_NATIVE_SCHAR');
case 'uint8'
datatype_id = H5T.copy('H5T_NATIVE_UCHAR');
case 'char'
datatype_id = H5T.copy('H5T_C_S1');
H5T.set_size(datatype_id,length(attvalue));
H5T.set_strpad(datatype_id,'H5T_STR_NULLTERM');
otherwise
error(message('images:H5ATTPUT:unsupportedDatatype', class( attvalue )));
end
return
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% PARSE_AND_VALIDATE_INPUTS
%
% The VARNAME and ATTNAME values may need to be parsed from one of the inputs,
% and all but the ATTVALUE input must have their datatypes checked.
function [varname,attname,attvalue] = parse_and_validate_inputs(hfile,varargin)
if ~ischar(hfile)
error(message('images:H5ATTPUT:badFilenameDatatype'));
end
if nargin == 3
varname = varargin{1};
attvalue = varargin{2};
slashes = strfind(varname, '/');
if isempty(slashes)
error (message('images:H5ATTGET:badAttributePath', varname));
elseif slashes == 1
%
% case of "/attname" is different than "/path/to/attname"
attname = varname(2:end);
varname = varname(1);
else
attname = varname(slashes(end)+1:end);
varname = varname(1:slashes(end)-1);
end
else
varname = varargin{1};
attname = varargin{2};
attvalue = varargin{3};
end
if ~ischar(varname)
error(message('images:H5ATTPUT:badVarnameDatatype'));
end
if ~ischar(attname)
error(message('images:H5ATTPUT:badAttnameDatatype'));
end
return
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