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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever. */
#ifndef __TRACKERLOGIC_H__
#define __TRACKERLOGIC_H__
#include <sys/types.h>
#include <sys/time.h>
/* Should be called BYTE, WORD, DWORD - but some OSs already have that and there's no #iftypedef */
/* They mark memory used as data instead of integer or human readable string -
they should be cast before used as integer/text */
typedef unsigned char ot_byte;
typedef unsigned short ot_word;
typedef unsigned long ot_dword;
typedef ot_byte ot_hash[20];
typedef ot_dword ot_ip;
typedef time_t ot_time;
#define MEMMOVE memmove
#define BZERO bzero
#define FORMAT_FIXED_STRING sprintf
#define FORMAT_FORMAT_STRING sprintf
#define BINARY_FIND binary_search
// We maintain a list of 256 pointers to sorted list of ot_torrent structs
// Sort key is, of course, its hash
// This list points to 9 pools of peers each grouped in five-minute-intervals
// thus achieving a timeout of 2700s or 45 minutes
// These pools are sorted by its binary content
#define OT_POOLS_COUNT 9
#define OT_POOLS_TIMEOUT 300
#define NOW (time(NULL)/OT_POOLS_TIMEOUT)
#define OT_VECTOR_MIN_MEMBERS 128
#define OT_VECTOR_GROW_RATIO 2
#define OT_VECTOR_SHRINK_THRESH 3
#define OT_VECTOR_SHRINK_RATIO 2
typedef struct {
void *data;
size_t size;
size_t space;
} ot_vector;
typedef struct {
ot_byte data[8];
} ot_peer;
static const ot_byte PEER_FLAG_SEEDING = 0x80;
static const ot_byte PEER_FLAG_COMPLETED = 0x40;
static const ot_byte PEER_FLAG_STOPPED = 0x20;
#define OT_SETIP( peer, ip ) MEMMOVE((peer),(ip),4);
#define OT_SETPORT( peer, port ) MEMMOVE(((ot_byte*)peer)+4,(port),2);
#define OT_FLAG(peer) (((ot_byte*)(peer))[6])
#define OT_PEER_COMPARE_SIZE ((size_t)6)
#define OT_HASH_COMPARE_SIZE (sizeof(ot_hash))
typedef struct {
ot_time base;
unsigned long seed_count[ OT_POOLS_COUNT ];
unsigned long downloaded;
ot_vector peers[ OT_POOLS_COUNT ];
} ot_peerlist;
typedef struct {
ot_hash hash;
ot_peerlist *peer_list;
} ot_torrent;
//
// Exported functions
//
int init_logic( );
void deinit_logic( );
ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer );
size_t return_peers_for_torrent( ot_torrent *torrent, unsigned long amount, char *reply );
size_t return_scrape_for_torrent( ot_hash *hash, char *reply );
void remove_peer_from_torrent( ot_hash *hash, ot_peer *peer );
void cleanup_torrents( void );
#endif
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