/*
 * Copyright (c) 2023 joshua stein <jcs@jcs.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
/* ipdb database format:

	[uint32_t][0] file offset of network "0.0.0.0/8"
	[uint32_t][1] file offset of network "1.0.0.0/8"
	...
	[uint32_t][255] file offset of network "255.0.0.0/8"
	[uint8_t] location 0 length
	[char][length] location 0
	[uint8_t] location 1 length
	[char][length] location 1
	...
	[uint32_t] network 0 start (1.0.0.0)
	[uint32_t] network 0 end (1.0.0.255)
	[uint32_t] network 0 location pointer
	[uint32_t] network 1 start (1.0.1.0)
	[uint32_t] network 1 end (1.0.1.255)
	[uint32_t] network 1 location pointer
	...

	For an ip "5.6.7.8", look up table[5] and seek there, then do a binary
	search between that location and that of table[6] (or end of file if
	255).

	If the table location points to 0, that network is not in the file.
*/

#ifndef __IPDB_H__
#define __IPDB_H__

#include "util.h"

struct ipdb_file {
	short fh;
	size_t fsize;
	u_int32_t starts[256];
};

struct ipdb_file * ipdb_open(char *filename);
void ipdb_close(struct ipdb_file **ipdbp);
char * ipdb_lookup(struct ipdb_file *ipdb, u_int32_t ip);

#endif