VILLASnode/include/villas/advio.h

/** libcurl based advanced IO aka ADVIO.
 *
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
 * @license GNU General Public License (version 3)
 *
 * VILLASnode
 *
 * 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
 * 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/>.
 *********************************************************************************/

#pragma once

#include <stdio.h>

#include <curl/curl.h>

#include "crypt.h"

struct advio {
	CURL *curl;
	FILE *file;
	
	long uploaded;		/**< Upload progress. How much has already been uploaded to the remote file. */
	long downloaded;	/**< Download progress. How much has already been downloaded from the remote file. */
	
	int completed:1;	/**< Was the upload completd */

	unsigned char hash[SHA_DIGEST_LENGTH];

	char mode[2];
	char *uri;
};

typedef struct advio AFILE;

/* The remaining functions from stdio are just replaced macros */
#define afeof(af)			feof((af)->file)
#define aftell(af)			ftell((af)->file)
#define afileno(af)			fileno((af)->file)
#define afread(ptr, sz, nitems, af)	fread(ptr, sz, nitems, (af)->file)
#define afwrite(ptr, sz, nitems, af)	fwrite(ptr, sz, nitems, (af)->file)
#define afputs(ptr, af)			fputs(ptr, (af)->file)
#define afprintf(af, fmt, ...)		fprintf((af)->file, fmt, __VA_ARGS__)
#define afscanf(af, fmt, ...)		fprintf((af)->file, fmt, __VA_ARGS__)
#define agetline(linep, linecapp, af)	getline(linep, linecapp, (af)->file)

/* Extensions */
#define auri(af)			((af)->uri)
#define ahash(af)			((af)->hash)

AFILE *afopen(const char *url, const char *mode);

int afclose(AFILE *file);

int afflush(AFILE *file);

int afseek(AFILE *file, long offset, int origin);

void arewind(AFILE *file);

/** Download contens from remote file
 *
 *
 * @param resume Do a partial download and append to the local file
 */
int adownload(AFILE *af, int resume);

int aupload(AFILE *af, int resume);