114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
/*
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* cfile.c
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*
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* Helpers to read .cfile (complex samples from gnuradio)
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*
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* Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*! \addtogroup cfile
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* @{
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*/
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/*! \file cfile.c
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* \brief Osmocom .cfile helpers implementation
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*/
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#include <complex.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <osmocom/dsp/cfile.h>
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/*! \brief .cfile loader: mmap() the data into memory (read-only)
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* \param[in] filename Filename of the .cfile to map
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* \returns A structure desribing the mapped data
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*/
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struct cfile *
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cfile_load(const char *filename)
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{
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struct cfile *cf;
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struct stat st;
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int rv, fd = -1;
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cf = calloc(1, sizeof(struct cfile));
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if (!cf) {
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perror("calloc");
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goto err;
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}
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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perror("open");
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goto err;
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}
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rv = fstat(fd, &st);
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if (rv) {
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perror("stat");
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goto err;
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}
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cf->_blen = st.st_size;
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cf->len = cf->_blen / sizeof(float complex);
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cf->data = mmap(NULL, cf->_blen, PROT_READ, MAP_SHARED, fd, 0);
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if (!cf->data) {
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perror("mmap");
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goto err;
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}
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close(fd);
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return cf;
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err:
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if (cf) {
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if (fd >= 0)
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close(fd);
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free(cf);
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}
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return NULL;
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}
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/*! \brief Release all resources associated with a mapped .cfile
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* \param[in] cf Structure describing the cfile to unmap
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*/
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void
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cfile_release(struct cfile *cf)
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{
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int rv;
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rv = munmap(cf->data, cf->_blen);
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if (rv)
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perror("munmap");
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free(cf);
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}
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/*! @} */
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