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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Small program to illustrate the "misalignment" of members within a compound
* datatype, in a datatype fixed by H5Tget_native_type().
*/
#include "hdf5.h"
#include "H5private.h"
#include "h5tools.h"
const char *fname = "talign.h5";
const char *setname = "align";
/*
* This program assumes that there is no extra space between the members 'Ok'
* and 'Not Ok', (there shouldn't be because they are of the same atomic type
* H5T_NATIVE_FLOAT, and they are placed within the compound next to one
* another per construction)
*/
int main(void)
{
hid_t fil=-1, spc=-1, set=-1;
hid_t cs6=-1, cmp=-1, fix=-1;
hid_t cmp1=-1, cmp2=-1, cmp3=-1;
hid_t plist=-1;
hid_t array_dt=-1;
hsize_t dim[2];
hsize_t cdim[4];
char string5[5];
float fok[2] = {1234.0f, 2341.0f};
float fnok[2] = {5678.0f, 6785.0f};
float *fptr = NULL;
char *data = NULL;
int result = 0;
herr_t error = 1;
printf("%-70s", "Testing alignment in compound datatypes");
strcpy(string5, "Hi!");
HDunlink(fname);
fil = H5Fcreate(fname, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
if (fil < 0) {
puts("*FAILED*");
return 1;
}
H5E_BEGIN_TRY {
(void)H5Ldelete(fil, setname, H5P_DEFAULT);
} H5E_END_TRY;
cs6 = H5Tcopy(H5T_C_S1);
H5Tset_size(cs6, sizeof(string5));
H5Tset_strpad(cs6, H5T_STR_NULLPAD);
cmp = H5Tcreate(H5T_COMPOUND, sizeof(fok) + sizeof(string5) + sizeof(fnok));
H5Tinsert(cmp, "Awkward length", 0, cs6);
cdim[0] = sizeof(fok) / sizeof(float);
array_dt = H5Tarray_create2(H5T_NATIVE_FLOAT, 1, cdim);
H5Tinsert(cmp, "Ok", sizeof(string5), array_dt);
H5Tclose(array_dt);
cdim[0] = sizeof(fnok) / sizeof(float);
array_dt = H5Tarray_create2(H5T_NATIVE_FLOAT, 1, cdim);
H5Tinsert(cmp, "Not Ok", sizeof(fok) + sizeof(string5), array_dt);
H5Tclose(array_dt);
fix = H5Tget_native_type(cmp, H5T_DIR_DEFAULT);
cmp1 = H5Tcreate(H5T_COMPOUND, sizeof(fok));
cdim[0] = sizeof(fok) / sizeof(float);
array_dt = H5Tarray_create2(H5T_NATIVE_FLOAT, 1, cdim);
H5Tinsert(cmp1, "Ok", 0, array_dt);
H5Tclose(array_dt);
cmp2 = H5Tcreate(H5T_COMPOUND, sizeof(string5));
H5Tinsert(cmp2, "Awkward length", 0, cs6);
cmp3 = H5Tcreate(H5T_COMPOUND, sizeof(fnok));
cdim[0] = sizeof(fnok) / sizeof(float);
array_dt = H5Tarray_create2(H5T_NATIVE_FLOAT, 1, cdim);
H5Tinsert(cmp3, "Not Ok", 0, array_dt);
H5Tclose(array_dt);
plist = H5Pcreate(H5P_DATASET_XFER);
if((error = H5Pset_preserve(plist, 1)) < 0)
goto out;
/*
* Create a small dataset, and write data into it we write each field
* in turn so that we are avoid alignment issues at this point
*/
dim[0] = 1;
spc = H5Screate_simple(1, dim, NULL);
set = H5Dcreate2(fil, setname, cmp, spc, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
H5Dwrite(set, cmp1, spc, H5S_ALL, plist, fok);
H5Dwrite(set, cmp2, spc, H5S_ALL, plist, string5);
H5Dwrite(set, cmp3, spc, H5S_ALL, plist, fnok);
H5Dclose(set);
/* Now open the set, and read it back in */
data = (char *)HDmalloc(H5Tget_size(fix));
if(!data) {
perror("malloc() failed");
abort();
}
set = H5Dopen2(fil, setname, H5P_DEFAULT);
H5Dread(set, fix, spc, H5S_ALL, H5P_DEFAULT, data);
fptr = (float *)(data + H5Tget_member_offset(fix, 1));
H5Dclose(set);
out:
if(error < 0) {
result = 1;
puts("*FAILED - HDF5 library error*");
} else if(fok[0] != fptr[0] || fok[1] != fptr[1]
|| fnok[0] != fptr[2] || fnok[1] != fptr[3]) {
char *mname;
result = 1;
mname = H5Tget_member_name(fix, 0);
printf("%14s (%2d) %6s = %s\n",
mname ? mname : "(null)", (int)H5Tget_member_offset(fix,0),
string5, (char *)(data + H5Tget_member_offset(fix, 0)));
if(mname)
H5free_memory(mname);
fptr = (float *)(data + H5Tget_member_offset(fix, 1));
mname = H5Tget_member_name(fix, 1);
printf("Data comparison:\n"
"%14s (%2d) %6f = %f\n"
" %6f = %f\n",
mname ? mname : "(null)", (int)H5Tget_member_offset(fix,1),
(double)fok[0], (double)fptr[0],
(double)fok[1], (double)fptr[1]);
if(mname)
H5free_memory(mname);
fptr = (float *)(data + H5Tget_member_offset(fix, 2));
mname = H5Tget_member_name(fix, 2);
printf("%14s (%2d) %6f = %f\n"
" %6f = %6f\n",
mname ? mname : "(null)", (int)H5Tget_member_offset(fix,2),
(double)fnok[0], (double)fptr[0],
(double)fnok[1], (double)fptr[1]);
if(mname)
H5free_memory(mname);
fptr = (float *)(data + H5Tget_member_offset(fix, 1));
printf("\n"
"Short circuit\n"
" %6f = %f\n"
" %6f = %f\n"
" %6f = %f\n"
" %6f = %f\n",
(double)fok[0], (double)fptr[0],
(double)fok[1], (double)fptr[1],
(double)fnok[0], (double)fptr[2],
(double)fnok[1], (double)fptr[3]);
puts("*FAILED - compound type alignmnent problem*");
} else {
puts(" PASSED");
}
if(data)
HDfree(data);
H5Sclose(spc);
H5Tclose(cs6);
H5Tclose(cmp);
H5Tclose(fix);
H5Tclose(cmp1);
H5Tclose(cmp2);
H5Tclose(cmp3);
H5Pclose(plist);
H5Fclose(fil);
HDunlink(fname);
fflush(stdout);
return result;
}
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