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slmodemd/modem_datafile.c

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+/*****************************************************************************/
+
+/*
+ *
+ *   Copyright (c) 2002, Smart Link Ltd.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *       1. Redistributions of source code must retain the above copyright
+ *          notice, this list of conditions and the following disclaimer.
+ *       2. Redistributions in binary form must reproduce the above
+ *          copyright notice, this list of conditions and the following
+ *          disclaimer in the documentation and/or other materials provided
+ *          with the distribution.
+ *       3. Neither the name of the Smart Link Ltd. nor the names of its
+ *          contributors may be used to endorse or promote products derived
+ *          from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ *
+ *	modem_datafile.c  --  modem data file stuff.
+ *
+ *	Author: Sasha K (sashak@smlink.com)
+ *
+ */
+
+/*****************************************************************************/
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <modem_defs.h>
+#include <modem_debug.h>
+
+#define DBG(fmt,args...) dprintf( fmt , ##args );
+
+
+struct datafile_record {
+	unsigned minor;
+	struct dsp_info dsp_info;
+	unsigned size;
+};
+
+
+
+int datafile_load_info(char *file_name,struct dsp_info *info)
+{
+	struct datafile_record *dr;
+	int ret = -1;
+	int fd;
+
+	DBG("open file: %s...\n",file_name);
+	fd = open(file_name, 0, 0);
+	if(fd < 0) {
+		DBG("cannot open '%s': %s\n",
+		    file_name,strerror(errno));
+		return -errno;
+	}
+
+        dr = (struct datafile_record *)malloc(sizeof(*dr));
+        if (!dr) {
+		close(fd);
+		return -errno;
+	}
+
+	ret = read(fd,(char *)dr,sizeof(*dr));
+	if (ret < 0) {
+		free(dr);
+		close(fd);
+		return -errno;
+	}
+
+	/* simple validation */
+	if(dr->size != sizeof(*dr)) {
+		free(dr);
+		close(fd);
+		return -1;
+	}
+
+	memcpy(info,&dr->dsp_info,sizeof(*info));
+
+	free(dr);
+	close(fd);
+	return ret;
+}
+
+
+int datafile_save_info(char *file_name,struct dsp_info *info)
+{
+	struct datafile_record *dr;
+	int ret = -1;
+	int fd;
+
+	fd = open(file_name,O_CREAT|O_WRONLY,(S_IRUSR|S_IWUSR));
+	if(fd < 0)
+		return -errno;
+
+        dr = (struct datafile_record *)malloc(sizeof(*dr));
+        if (!dr) {
+		return -errno;
+		close(fd);
+	}
+
+	memcpy(&dr->dsp_info,info,sizeof(*info));
+	dr->size = sizeof(*dr);
+
+	ret = write(fd,(char *)dr,sizeof(*dr));
+
+	free(dr);
+	close(fd);
+	return ret;
+}
+
+
+