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137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* libLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include "lte/io/filesource.h"
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int filesource_init(filesource_t *q, char *filename, data_type_t type) {
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bzero(q, sizeof(filesource_t));
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q->f = fopen(filename, "r");
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if (!q->f) {
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perror("fopen");
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return -1;
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}
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q->type = type;
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return 0;
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}
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void filesource_free(filesource_t *q) {
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if (q->f) {
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fclose(q->f);
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}
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bzero(q, sizeof(filesource_t));
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}
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void filesource_seek(filesource_t *q, int pos) {
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fseek(q->f, pos, SEEK_SET);
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}
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int read_complex_f(FILE *f, _Complex float *y) {
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char in_str[64];
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_Complex float x;
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if (NULL == fgets(in_str, 64, f)) {
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return -1;
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} else {
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if (index(in_str, 'i') || index(in_str, 'j')) {
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sscanf(in_str,"%f%fi",&(__real__ x),&(__imag__ x));
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} else {
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__imag__ x = 0;
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sscanf(in_str,"%f",&(__real__ x));
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}
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*y = x;
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return 0;
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}
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}
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int filesource_read(filesource_t *q, void *buffer, int nsamples) {
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int i;
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float *fbuf = (float*) buffer;
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_Complex float *cbuf = (_Complex float*) buffer;
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_Complex short *sbuf = (_Complex short*) buffer;
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int size;
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switch(q->type) {
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case FLOAT:
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for (i=0;i<nsamples;i++) {
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if (EOF == fscanf(q->f,"%g\n",&fbuf[i]))
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break;
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}
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break;
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case COMPLEX_FLOAT:
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for (i=0;i<nsamples;i++) {
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if (read_complex_f(q->f, &cbuf[i])) {
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break;
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}
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}
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break;
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case COMPLEX_SHORT:
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for (i=0;i<nsamples;i++) {
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if (EOF == fscanf(q->f,"%hd%hdi\n",&(__real__ sbuf[i]),&(__imag__ sbuf[i])))
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break;
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}
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break;
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case FLOAT_BIN:
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case COMPLEX_FLOAT_BIN:
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case COMPLEX_SHORT_BIN:
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if (q->type == FLOAT_BIN) {
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size = sizeof(float);
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} else if (q->type == COMPLEX_FLOAT_BIN) {
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size = sizeof(_Complex float);
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} else if (q->type == COMPLEX_SHORT_BIN) {
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size = sizeof(_Complex short);
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}
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return fread(buffer, size, nsamples, q->f);
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break;
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default:
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i = -1;
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break;
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}
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return i;
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}
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int filesource_initialize(filesource_hl* h) {
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return filesource_init(&h->obj, h->init.file_name, h->init.data_type);
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}
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int filesource_work(filesource_hl* h) {
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h->out_len = filesource_read(&h->obj, h->output, h->ctrl_in.nsamples);
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if (h->out_len < 0) {
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return -1;
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}
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return 0;
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}
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int filesource_stop(filesource_hl* h) {
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filesource_free(&h->obj);
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return 0;
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}
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