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/*
Copyright (C) 2010 EPFL (Ecole Polytechnique Fédérale de Lausanne)
Laboratory CNBI (Chair in Non-Invasive Brain-Machine Interface)
Nicolas Bourdaud <nicolas.bourdaud@epfl.ch>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <xdfio.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#define CHUNK_NS 8
#define FILENAME "ref128-13-97-50-11-7-1.bdf"
struct xdf *xdfr = NULL, *xdft = NULL;
double *buffr = NULL, *bufft = NULL;
static int keepch(int i, int nchskip)
{
if (nchskip == 0)
return 1;
return (i / nchskip)%2;
}
static int setup_files(const char* filename, int nchskip, int* nchr, int* ncht)
{
int i, offset, arr;
size_t st[1];
int arrtp = XDFDOUBLE;
struct xdfch* ch;
xdfr = xdf_open(filename, XDF_READ, XDF_ANY);
if (!xdfr)
goto error;
xdft = xdf_open(filename, XDF_READ, XDF_ANY);
if (!xdft)
goto error;
// Setup reference file
offset = i = 0;
*nchr = 0;
while ((ch = xdf_get_channel(xdfr, i))) {
if (xdf_set_chconf(ch, XDF_CF_ARRTYPE, arrtp,
XDF_CF_ARROFFSET, offset,
XDF_NOF))
goto error;
offset += sizeof(double);
*nchr += 1;
i++;
}
st[0] = (unsigned int)offset;
if (xdf_define_arrays(xdfr, 1, st) || xdf_prepare_transfer(xdfr))
goto error;
// Setup test file
offset = i = 0;
*ncht = 0;
while ((ch = xdf_get_channel(xdft, i))) {
// Skip block of nchskip channel
arr = keepch(i, nchskip) ? 0 : -1;
if (xdf_set_chconf(ch, XDF_CF_ARRTYPE, arrtp,
XDF_CF_ARRINDEX, arr,
XDF_CF_ARROFFSET, offset,
XDF_NOF))
goto error;
if (arr == 0) {
offset += sizeof(double);
*ncht += 1;
}
i++;
}
st[0] = (unsigned int)offset;
if (xdf_define_arrays(xdft, 1, st) || xdf_prepare_transfer(xdft))
goto error;
return 0;
error:
fprintf(stderr, "\terror during file preparation\n");
return -1;
}
int move_to_offset(off_t offset)
{
ssize_t ns;
size_t reqns, nstot = 0;
while (nstot < (size_t)offset) {
reqns = (offset - nstot < CHUNK_NS) ?
(offset - nstot) : CHUNK_NS;
ns = xdf_read(xdfr, reqns, buffr);
if (ns <= 0)
goto error;
nstot += ns;
}
if (xdf_seek(xdft, offset, SEEK_SET) < 0)
goto error;
return 0;
error:
fprintf(stderr, "\terror while seeking\n");
return -1;
}
static int diffdata(int nchskip, unsigned int nchr,
unsigned int ncht, size_t ns)
{
unsigned int ichr, icht, is;
for (is=0; is<ns; is++) {
icht = 0;
for (ichr=0; ichr<nchr; ichr++) {
if (!keepch(ichr, nchskip))
continue;
if (buffr[is*nchr + ichr] != bufft[is*ncht+ icht])
return -1;
icht++;
}
}
return 0;
}
int test_seek_skip(const char* filename, off_t offset, int nchskip)
{
int nchr, ncht, retcode = -1;
ssize_t nsr, nst;
buffr = NULL;
bufft = NULL;
if (setup_files(filename, nchskip, &nchr, &ncht))
goto exit;
buffr = malloc(nchr*CHUNK_NS*sizeof(*buffr));
bufft = malloc(ncht*CHUNK_NS*sizeof(*bufft));
if (!buffr || !bufft)
goto exit;
if (move_to_offset(offset))
goto exit;
while (1) {
nsr = xdf_read(xdfr, CHUNK_NS, buffr);
nst = xdf_read(xdft, CHUNK_NS, bufft);
if ((nsr < 0) || (nst < 0) || (nsr != nst)) {
fprintf(stderr, "\tfailure during reading\n");
goto exit;
}
if (diffdata(nchskip, nchr, ncht, nsr)) {
fprintf(stderr, "\tData differ\n");
retcode = -2;
goto exit;
}
if (nsr == 0)
break;
}
retcode = 0;
exit:
if (retcode == -1)
fprintf(stderr, "\terror caught: (%i) %s\n",
errno, strerror(errno));
free(buffr);
free(bufft);
xdf_close(xdfr);
xdf_close(xdft);
xdfr = xdft = NULL;
return retcode;
}
int main(int argc, char* argv[])
{
(void)argc;
(void)argv;
char reffilename[512];
sprintf(reffilename, "%s/%s", getenv("srcdir"), FILENAME);
fprintf(stderr, "\tfirst test\n");
if (test_seek_skip(reffilename, 0, 0))
return 1;
fprintf(stderr, "\tsecond test\n");
if (test_seek_skip(reffilename, 50, 0))
return 1;
fprintf(stderr, "\tthird test\n");
if (test_seek_skip(reffilename, 50, 4))
return 1;
return 0;
}
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