c6c904de02
Purpose: Enhancement
Description: On 64-bit Solaris and on Crays h5_chunk_read example
displayed garbage instead of 0. One may mistakenly conclude
that example is broken.
h5_chunk_read reads data written by h5_extend_write.
h5_extend_write extends dataset and does only partial writes. Therefore
some data is never written to the file and since fill value
is not set up, garbage is read back by h5_chunk_read
Solution: Set up fill value to initialize data.
Platforms tested: arabica 64-bit and Cray T3E.
Misc. update:
175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
/*
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* This example shows how to work with extendible dataset.
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* In the current version of the library dataset MUST be
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* chunked.
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*
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*/
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#include "hdf5.h"
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#define H5FILE_NAME "SDSextendible.h5"
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#define DATASETNAME "ExtendibleArray"
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#define RANK 2
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#define NX 10
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#define NY 5
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int
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main (void)
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{
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hid_t file; /* handles */
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hid_t dataspace, dataset;
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hid_t filespace;
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hid_t cparms;
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hsize_t dims[2] = { 3, 3}; /*
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* dataset dimensions
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* at the creation time
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*/
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hsize_t dims1[2] = { 3, 3}; /* data1 dimensions */
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hsize_t dims2[2] = { 7, 1}; /* data2 dimensions */
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hsize_t dims3[2] = { 2, 2}; /* data3 dimensions */
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hsize_t maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
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hsize_t chunk_dims[2] ={2, 5};
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hsize_t size[2];
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hssize_t offset[2];
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herr_t status;
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int data1[3][3] = { {1, 1, 1}, /* data to write */
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{1, 1, 1},
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{1, 1, 1} };
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int data2[7] = { 2, 2, 2, 2, 2, 2, 2};
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int data3[2][2] = { {3, 3},
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{3, 3} };
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int fill_val = 0;
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/*
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* Create the data space with unlimited dimensions.
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*/
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dataspace = H5Screate_simple(RANK, dims, maxdims);
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/*
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* Create a new file. If file exists its contents will be overwritten.
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*/
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file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/*
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* Modify dataset creation properties, i.e. enable chunking.
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*/
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cparms = H5Pcreate(H5P_DATASET_CREATE);
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status = H5Pset_chunk( cparms, RANK, chunk_dims);
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H5Pset_fill_value(cparms, H5T_NATIVE_INT, &fill_val);
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/*
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* Create a new dataset within the file using cparms
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* creation properties.
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*/
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dataset = H5Dcreate(file, DATASETNAME, H5T_NATIVE_INT, dataspace,
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cparms);
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/*
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* Extend the dataset. This call assures that dataset is at least 3 x 3.
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*/
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size[0] = 3;
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size[1] = 3;
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab.
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 0;
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offset[1] = 0;
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status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
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dims1, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5P_DEFAULT, data1);
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/*
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* Extend the dataset. Dataset becomes 10 x 3.
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*/
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dims[0] = dims1[0] + dims2[0];
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size[0] = dims[0];
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size[1] = dims[1];
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab.
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 3;
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offset[1] = 0;
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status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
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dims2, NULL);
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/*
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* Define memory space
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*/
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dataspace = H5Screate_simple(RANK, dims2, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5P_DEFAULT, data2);
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/*
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* Extend the dataset. Dataset becomes 10 x 5.
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*/
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dims[1] = dims1[1] + dims3[1];
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size[0] = dims[0];
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size[1] = dims[1];
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 0;
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offset[1] = 3;
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status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
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dims3, NULL);
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/*
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* Define memory space.
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*/
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dataspace = H5Screate_simple(RANK, dims3, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5P_DEFAULT, data3);
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/*
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* Resulting dataset
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*
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* 3 3 3 2 2
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* 3 3 3 2 2
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* 3 3 3 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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* 2 0 0 0 0
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*/
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/*
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* Close/release resources.
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*/
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H5Dclose(dataset);
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H5Sclose(dataspace);
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H5Sclose(filespace);
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H5Pclose(cparms);
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H5Fclose(file);
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return 0;
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}
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