/*
 * inc/Knetfile.h
 * 
 * Copyright (c) 2011-2013 BGI-Shenzhen <soap at genomics dot org dot cn>. 
 *
 * This file is part of SOAPdenovo-Trans.
 *
 * SOAPdenovo-Trans 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
 * (at your option) any later version.
 *
 * SOAPdenovo-Trans 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 SOAPdenovo-Trans.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#ifndef KNETFILE_H
#define KNETFILE_H

#include <stdint.h>
#include <fcntl.h>

#ifndef _WIN32
#define netread(fd, ptr, len) read(fd, ptr, len)
#define netwrite(fd, ptr, len) write(fd, ptr, len)
#define netclose(fd) close(fd)
#else
#include <winsock2.h>
#define netread(fd, ptr, len) recv(fd, ptr, len, 0)
#define netwrite(fd, ptr, len) send(fd, ptr, len, 0)
#define netclose(fd) closesocket(fd)
#endif

// FIXME: currently I/O is unbuffered

#define KNF_TYPE_LOCAL 1
#define KNF_TYPE_FTP   2
#define KNF_TYPE_HTTP  3

typedef struct knetFile_s {
	int type, fd;
	int64_t offset;
	char *host, *port;

	// the following are for FTP only
	int ctrl_fd, pasv_ip[4], pasv_port, max_response, no_reconnect, is_ready;
	char *response, *retr, *size_cmd;
	int64_t seek_offset; // for lazy seek
    int64_t file_size;

	// the following are for HTTP only
	char *path, *http_host;
} knetFile;

#define knet_tell(fp) ((fp)->offset)
#define knet_fileno(fp) ((fp)->fd)

#ifdef __cplusplus
extern "C" {
#endif

#ifdef _WIN32
	int knet_win32_init();
	void knet_win32_destroy();
#endif

	knetFile *knet_open(const char *fn, const char *mode);

	/* 
	   This only works with local files.
	 */
	knetFile *knet_dopen(int fd, const char *mode);

	/*
	  If ->is_ready==0, this routine updates ->fd; otherwise, it simply
	  reads from ->fd.
	 */
	off_t knet_read(knetFile *fp, void *buf, off_t len);

	/*
	  This routine only sets ->offset and ->is_ready=0. It does not
	  communicate with the FTP server.
	 */
	off_t knet_seek(knetFile *fp, int64_t off, int whence);
	int knet_close(knetFile *fp);

#ifdef __cplusplus
}
#endif

#endif