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/* -*- c-file-style: "stroustrup" -*- */
//! <!-- [H5DOwrite] -->
#include <zlib.h>
#include <math.h>
#define DEFLATE_SIZE_ADJUST(s) (ceil(((double)(s)) * 1.001) + 12)
:
:
size_t buf_size = CHUNK_NX*CHUNK_NY*sizeof(int);
const Bytef *z_src = (const Bytef *)(direct_buf);
Bytef * z_dst; /* Destination buffer */
uLongf z_dst_nbytes = (uLongf)DEFLATE_SIZE_ADJUST(buf_size);
uLong z_src_nbytes = (uLong)buf_size;
int aggression = 9; /* Compression aggression setting */
uint32_t filter_mask = 0;
size_t buf_size = CHUNK_NX * CHUNK_NY * sizeof(int);
/* Create the data space */
if ((dataspace = H5Screate_simple(RANK, dims, maxdims)) < 0)
goto error;
/* Create a new file */
if ((file = H5Fcreate(FILE_NAME5, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
goto error;
/* Modify dataset creation properties, i.e. enable chunking and compression */
if ((cparms = H5Pcreate(H5P_DATASET_CREATE)) < 0)
goto error;
if ((status = H5Pset_chunk(cparms, RANK, chunk_dims)) < 0)
goto error;
if ((status = H5Pset_deflate(cparms, aggression)) < 0)
goto error;
/* Create a new dataset within the file using cparms creation properties */
if ((dset_id = H5Dcreate2(file, DATASETNAME, H5T_NATIVE_INT, dataspace, H5P_DEFAULT, cparms,
H5P_DEFAULT)) < 0)
goto error;
/* Initialize data for one chunk */
for (i = n = 0; i < CHUNK_NX; i++)
for (j = 0; j < CHUNK_NY; j++)
direct_buf[i][j] = n++;
/* Allocate output (compressed) buffer */
outbuf = malloc(z_dst_nbytes);
z_dst = (Bytef *)outbuf;
/* Perform compression from the source to the destination buffer */
ret = compress2(z_dst, &z_dst_nbytes, z_src, z_src_nbytes, aggression);
/* Check for various zlib errors */
if (Z_BUF_ERROR == ret) {
fprintf(stderr, "overflow");
goto error;
}
else if (Z_MEM_ERROR == ret) {
fprintf(stderr, "deflate memory error");
goto error;
}
else if (Z_OK != ret) {
fprintf(stderr, "other deflate error");
goto error;
}
/* Write the compressed chunk data repeatedly to cover all the
* * chunks in the dataset, using the direct write function. */
for (i = 0; i < NX / CHUNK_NX; i++) {
for (j = 0; j < NY / CHUNK_NY; j++) {
status =
H5DOwrite_chunk(dset_id, H5P_DEFAULT, filter_mask, offset, z_dst_nbytes, outbuf);
offset[1] += CHUNK_NY;
}
offset[0] += CHUNK_NX;
offset[1] = 0;
}
/* Overwrite the first chunk with uncompressed data. Set the filter mask to
* * indicate the compression filter is skipped */
filter_mask = 0x00000001;
offset[0] = offset[1] = 0;
if (H5DOwrite_chunk(dset_id, H5P_DEFAULT, filter_mask, offset, buf_size, direct_buf) < 0)
goto error;
/* Read the entire dataset back for data verification converting ints to longs */
if (H5Dread(dataset, H5T_NATIVE_LONG, H5S_ALL, H5S_ALL, H5P_DEFAULT, outbuf_long) < 0)
goto error;
/* Data verification here */
:
:
//! <!-- [H5DOwrite] -->
//! <!-- [H5DOread] -->
#include <zlib.h>
#include <math.h>
#define DEFLATE_SIZE_ADJUST(s) (ceil(((double)(s)) * 1.001) + 12)
:
:
size_t buf_size = CHUNK_NX*CHUNK_NY*sizeof(int);
const Bytef *z_src = (const Bytef *)(direct_buf);
Bytef * z_dst; /* Destination buffer */
uLongf z_dst_nbytes = (uLongf)DEFLATE_SIZE_ADJUST(buf_size);
uLong z_src_nbytes = (uLong)buf_size;
int aggression = 9; /* Compression aggression setting */
uint32_t filter_mask = 0;
size_t buf_size = CHUNK_NX * CHUNK_NY * sizeof(int);
/* For H5DOread_chunk() */
void * readbuf = NULL; /* Buffer for reading data */
const Bytef *pt_readbuf; /* Point to the buffer for data read */
hsize_t read_chunk_nbytes; /* Size of chunk on disk */
int read_dst_buf[CHUNK_NX][CHUNK_NY]; /* Buffer to hold un-compressed data */
/* Create the data space */
if ((dataspace = H5Screate_simple(RANK, dims, maxdims)) < 0)
goto error;
/* Create a new file */
if ((file = H5Fcreate(FILE_NAME5, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
goto error;
/* Modify dataset creation properties, i.e. enable chunking and compression */
if ((cparms = H5Pcreate(H5P_DATASET_CREATE)) < 0)
goto error;
if ((status = H5Pset_chunk(cparms, RANK, chunk_dims)) < 0)
goto error;
if ((status = H5Pset_deflate(cparms, aggression)) < 0)
goto error;
/* Create a new dataset within the file using cparms creation properties */
if ((dset_id = H5Dcreate2(file, DATASETNAME, H5T_NATIVE_INT, dataspace, H5P_DEFAULT, cparms,
H5P_DEFAULT)) < 0)
goto error;
/* Initialize data for one chunk */
for (i = n = 0; i < CHUNK_NX; i++)
for (j = 0; j < CHUNK_NY; j++)
direct_buf[i][j] = n++;
/* Allocate output (compressed) buffer */
outbuf = malloc(z_dst_nbytes);
z_dst = (Bytef *)outbuf;
/* Perform compression from the source to the destination buffer */
ret = compress2(z_dst, &z_dst_nbytes, z_src, z_src_nbytes, aggression);
/* Check for various zlib errors */
if (Z_BUF_ERROR == ret) {
fprintf(stderr, "overflow");
goto error;
}
else if (Z_MEM_ERROR == ret) {
fprintf(stderr, "deflate memory error");
goto error;
}
else if (Z_OK != ret) {
fprintf(stderr, "other deflate error");
goto error;
}
/* Write the compressed chunk data repeatedly to cover all the
* * chunks in the dataset, using the direct write function. */
for (i = 0; i < NX / CHUNK_NX; i++) {
for (j = 0; j < NY / CHUNK_NY; j++) {
status = H5DOwrite_chunk(dset_id, H5P_DEFAULT, filter_mask, offset, z_dst_nbytes, outbuf);
offset[1] += CHUNK_NY;
}
offset[0] += CHUNK_NX;
offset[1] = 0;
}
if (H5Fflush(dataset, H5F_SCOPE_LOCAL) < 0)
goto error;
if (H5Dclose(dataset) < 0)
goto error;
if ((dataset = H5Dopen2(file, DATASETNAME1, H5P_DEFAULT)) < 0)
goto error;
offset[0] = CHUNK_NX;
offset[1] = CHUNK_NY;
/* Get the size of the compressed chunk */
ret = H5Dget_chunk_storage_size(dataset, offset, &read_chunk_nbytes);
readbuf = HDmalloc(read_chunk_nbytes);
pt_readbuf = (const Bytef *)readbuf;
/* Use H5DOread_chunk() to read the chunk back */
if ((status = H5DOread_chunk(dataset, H5P_DEFAULT, offset, &read_filter_mask, readbuf)) < 0)
goto error;
ret =
uncompress((Bytef *)read_dst_buf, (uLongf *)&buf_size, pt_readbuf, (uLong)read_chunk_nbytes);
/* Check for various zlib errors */
if (Z_BUF_ERROR == ret) {
fprintf(stderr, "error: not enough room in output buffer");
goto error;
}
else if (Z_MEM_ERROR == ret) {
fprintf(stderr, "error: not enough memory");
goto error;
}
else if (Z_OK != ret) {
fprintf(stderr, "error: corrupted input data");
goto error;
}
/* Data verification here */
:
:
//! <!-- [H5DOread] -->
|
