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adding quantize test

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Edward Hartnett 2021-11-26 06:29:35 -07:00
parent 26ac2a6cba
commit 2d504e02d8
1 changed files with 78 additions and 0 deletions
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78
nc_test4/tst_quantize.c
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@ -836,5 +836,83 @@ main(int argc, char **argv)
} }
} }
SUMMARIZE_ERR; SUMMARIZE_ERR;
printf("*** Nice, simple example of using BitGroom plus zlib...");
{
#define DIM_LEN_SIMPLE 8
#define EPSILON .1
int ncid;
int dimid;
int varid1, varid2;
float *float_data;
double *double_data;
int i;
/* Set up some data to write. */
if (!(float_data = malloc(DIM_LEN_SIMPLE * sizeof(float))))
ERR;
if (!(double_data = malloc(DIM_LEN_SIMPLE * sizeof(double))))
ERR;
for (i = 0; i < DIM_LEN_SIMPLE; i++)
{
float_data[i] = 1.5 * i;
double_data[i] = 1.5 * i;
}
/* Create file. */
if (nc_create(FILE_NAME, NC_NETCDF4, &ncid)) ERR;
/* Create dims. */
if (nc_def_dim(ncid, "dim1", DIM_LEN_SIMPLE, &dimid)) ERR;
/* Create the variables. */
if (nc_def_var(ncid, "var1", NC_FLOAT, NDIM1, &dimid, &varid1)) ERR;
if (nc_def_var(ncid, "var2", NC_DOUBLE, NDIM1, &dimid, &varid2)) ERR;
/* Set up quantization. This will not make the data any
* smaller, unless compression is also turned on. */
if (nc_def_var_quantize(ncid, varid1, NC_QUANTIZE_BITGROOM, NSD_3)) ERR;
if (nc_def_var_quantize(ncid, varid2, NC_QUANTIZE_BITGROOM, NSD_3)) ERR;
/* Set up zlib compression. This will work better because the
* data are quantized, yielding a smaller output file. */
if (nc_def_var_deflate(ncid, varid1, 0, 1, 1)) ERR;
if (nc_def_var_deflate(ncid, varid2, 0, 1, 1)) ERR;
/* Write data. */
if (nc_put_var_float(ncid, varid1, float_data)) ERR;
if (nc_put_var_double(ncid, varid2, double_data)) ERR;
/* Close the file. */
if (nc_close(ncid)) ERR;
/* Check the resulting file for correctness. */
{
float float_data_in[DIM_LEN_SIMPLE];
double double_data_in[DIM_LEN_SIMPLE];
/* Now reopen the file and check. */
if (nc_open(FILE_NAME, NC_NETCDF4, &ncid)) ERR;
/* Read the data. */
if (nc_get_var_float(ncid, varid1, float_data_in)) ERR;
if (nc_get_var_double(ncid, varid2, double_data_in)) ERR;
for (i = 0; i < DIM_LEN_SIMPLE; i++)
{
if (abs(float_data_in[i] - float_data[i]) > EPSILON)
ERR;
if (abs(double_data_in[i] - double_data[i]) > EPSILON)
ERR;
}
/* Close the file. */
if (nc_close(ncid)) ERR;
}
/* Free resources. */
free(float_data);
free(double_data);
}
SUMMARIZE_ERR;
FINAL_RESULTS; FINAL_RESULTS;
} }