int ft_swap_chunks_from_native(UINT32_T size, UINT32_T nchans, void *buf) {
UINT32_T offset = 0;
while (offset + sizeof(ft_chunkdef_t) <= size) {
ft_chunk_t *chunk = (ft_chunk_t *) ((char *) buf + offset);
offset += sizeof(ft_chunkdef_t) + chunk->def.size;
/* chunk definition fault (=too big) ? */
if (offset > size) return -1;
switch(chunk->def.type) {
case FT_CHUNK_RESOLUTIONS:
if (chunk->def.size >= nchans*sizeof(FLOAT64_T)) {
ft_swap64(nchans, chunk->data);
}
break;
/* Add other cases here as needed */
}
ft_swap32(2, &(chunk->def));
}
return 0;
}
void ft_swap_data(UINT32_T numel, UINT32_T datatype, void *data) {
switch(datatype) {
case DATATYPE_CHAR:
case DATATYPE_UINT8:
case DATATYPE_INT8:
return;
case DATATYPE_UINT16:
case DATATYPE_INT16:
ft_swap16(numel, data);
return;
case DATATYPE_UINT32:
case DATATYPE_INT32:
case DATATYPE_FLOAT32:
ft_swap32(numel, data);
return;
case DATATYPE_UINT64:
case DATATYPE_INT64:
case DATATYPE_FLOAT64:
ft_swap64(numel, data);
return;
}
}
/** Prepares "start" RDA packet with channel names determined from the corresponding chunk (or empty)
Also converts to little-endian if this machine is big endian
@param hdr Points to headerdef_t structure, will be filled, may not be NULL
@return created start item, or NULL on error (connection / out of memory)
*/
rda_buffer_item_t *rda_aux_get_hdr_prep_start(int ft_buffer, headerdef_t *hdr) {
rda_buffer_item_t *item = NULL;
const ft_chunk_t *chunk;
rda_msg_start_t *R;
char *str;
double *dRes;
const void *dResSource;
size_t bytesTotal;
int i,r,numExtraZeros,sizeOrgNames;
message_t req, *resp = NULL;
messagedef_t msg_def;
req.def = &msg_def;
req.buf = NULL;
msg_def.version = VERSION;
msg_def.command = GET_HDR;
msg_def.bufsize = 0;
r = clientrequest(ft_buffer, &req, &resp);
if (r<0 || resp == NULL || resp->def == NULL) {
goto cleanup;
}
if (resp->def->command != GET_OK || resp->def->bufsize < sizeof(headerdef_t) || resp->buf == NULL) {
goto cleanup;
}
memcpy(hdr, resp->buf, sizeof(headerdef_t));
/* Ok, we have the basic header, now look for proper FT_CHUNK_RESOLUTIONS */
chunk = find_chunk(resp->buf, sizeof(headerdef_t), resp->def->bufsize, FT_CHUNK_RESOLUTIONS);
if (chunk != NULL && chunk->def.size == hdr->nchans*sizeof(double)) {
dResSource = chunk->data;
/* fine - we just need a memcpy later on */
} else {
dResSource = NULL;
/* no suitable chunk found - set defaults later on */
}
/* Now see if we can find channel names */
chunk = find_chunk(resp->buf, sizeof(headerdef_t), resp->def->bufsize, FT_CHUNK_CHANNEL_NAMES);
if (chunk != NULL && chunk->def.size >= hdr->nchans) {
/* The chunk seems ok - check whether we really have N (0-terminated) strings */
int k,nz = 0;
for (k = 0; k<chunk->def.size && nz<=hdr->nchans; k++) {
if (chunk->data[k] == 0) nz++;
}
/* Okay, either k is at the end and we have nz<=N, or we have reached N=nz before the
end of the chunk. In both cases, it's safe to transmit the first 'k' bytes and
add (N-nz) trailing zeros */
numExtraZeros = hdr->nchans - nz;
sizeOrgNames = k;
} else {
sizeOrgNames = 0;
numExtraZeros = hdr->nchans;
}
bytesTotal = sizeof(rda_msg_start_t) + hdr->nchans*(sizeof(double)) + sizeOrgNames + numExtraZeros;
item = rda_aux_alloc_item(bytesTotal);
if (item == NULL) goto cleanup;
R = (rda_msg_start_t *) item->data;
memcpy(R->hdr.guid, _rda_guid, sizeof(_rda_guid));
R->hdr.nSize = bytesTotal;
R->hdr.nType = RDA_START_MSG;
R->nChannels = hdr->nchans;
R->dSamplingInterval = 1.0e6/(double) hdr->fsample; /* should be in microseconds */
if (_i_am_big_endian_) {
/* take care of hdr.nSize, hdr.nType, nChannels */
ft_swap32(3, &(R->hdr.nSize));
ft_swap64(1, &(R->dSamplingInterval));
}
/* R+1 points to first byte after header info */
dRes = (double *) ((void *)(R+1));
if (dResSource == NULL) {
/* Fill with resolution = 1.0 -- we have nothing better */
for (i=0;i<hdr->nchans;i++) dRes[i]=1.0;
} else {
memcpy(dRes, dResSource, hdr->nchans * sizeof(double));
}
/* swap byte order if necessary */
if (_i_am_big_endian_) {
ft_swap64(hdr->nchans, dRes);
}
/* Let 'str' point to first byte after the resolution values */
str = (char *) ((void *)(dRes + hdr->nchans));
if (sizeOrgNames > 0) {
memcpy(str, chunk->data, sizeOrgNames);
}
for (i=0;i<numExtraZeros;i++) str[sizeOrgNames + i] = 0;
/* done */
cleanup:
if (resp) {
if (resp->def) free(resp->def);
if (resp->buf) free(resp->buf);
free(resp);
}
return item;
}