d2ladder.c

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/*
 * Copyright (C) 2001		sousou	([e-mail])
 *
 * 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 2
 * of the License, or (at your option) 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include "common/setup_before.h"
#include "setup.h"

#ifdef HAVE_STDDEF_H
# include <stddef.h>
#else
# ifndef NULL
#  define NULL ((void *)0)
# endif
#endif
#ifdef STDC_HEADERS
# include <stdlib.h>
#else
# ifdef HAVE_MALLOC_H
#  include <malloc.h>
# endif
#endif
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
# endif
# ifdef HAVE_MEMORY_H
#  include <memory.h>
# endif
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# ifdef HAVE_SYS_FILE_H
#  include <sys/file.h>
# endif
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "compat/rename.h"
#include "d2ladder.h"
#include "prefs.h"
#include "common/tag.h"
#include "common/list.h"
#include "common/eventlog.h"
#include "compat/strncasecmp.h"
#include "compat/strerror.h"
#include "d2cs/d2charfile.h"
#include "common/xalloc.h"
#include "common/setup_after.h"

char			* d2ladder_ladder_file = NULL;
char			* d2ladder_backup_file = NULL;

t_d2ladderlist    	* d2ladder_list = NULL;
unsigned long 		d2ladder_maxtype;
int 			d2ladder_change_count=0;
int			d2ladder_need_rebuild = 0;
char                    * XMLname = "d2ladder.xml";


int d2ladderlist_init(void);
int d2ladderlist_destroy(void);
int d2ladder_empty(void);
int d2ladder_initladderfile(void);

t_d2ladder * d2ladderlist_find_type(unsigned int type);

int d2ladder_check(void);
int d2ladder_readladder(void);

int d2ladder_insert(t_d2ladder * d2ladder,t_d2ladder_info * pcharladderinfo);
int d2ladder_find_char_all(t_d2ladder * d2ladder, t_d2ladder_info * info);
int d2ladder_find_pos(t_d2ladder * d2ladder, t_d2ladder_info * info);
int d2ladder_update_info_and_pos(t_d2ladder * d2ladder, t_d2ladder_info * info, int oldpos, int newpos);
int d2ladder_checksum(unsigned char const * data, unsigned int len,unsigned int offset);
int d2ladder_checksum_set(void);
int d2ladder_checksum_check(void);


extern int d2ladder_update(t_d2ladder_info * pcharladderinfo)
{
	t_d2ladder * d2ladder;
	unsigned short hardcore,expansion,status;
	unsigned char class;
	unsigned int ladder_overall_type,ladder_class_type;

	if (!pcharladderinfo->charname[0]) return 0;
	class=pcharladderinfo->class;
	status=pcharladderinfo->status;

	if (prefs_get_ladder_chars_only() && (!charstatus_get_ladder(status)))
          return -1;
	
	hardcore=charstatus_get_hardcore(status); 
	expansion=charstatus_get_expansion(status); 
	ladder_overall_type=0;
	if (!expansion && class> D2CHAR_CLASS_MAX ) return -1; 
	if (expansion && class> D2CHAR_EXP_CLASS_MAX ) return -1; 
	if (hardcore && expansion) { 
		ladder_overall_type=D2LADDER_EXP_HC_OVERALL; 
	} else if (!hardcore && expansion) { 
		ladder_overall_type=D2LADDER_EXP_STD_OVERALL; 
	} else if (hardcore && !expansion) { 
		ladder_overall_type=D2LADDER_HC_OVERALL; 
	} else if (!hardcore && !expansion) { 
		ladder_overall_type=D2LADDER_STD_OVERALL; 
	} 

	ladder_class_type=ladder_overall_type + class+1; 

	d2ladder=d2ladderlist_find_type(ladder_overall_type);
	if(d2ladder_insert(d2ladder,pcharladderinfo)==1) {
		d2ladder_change_count++;
	}

	d2ladder=d2ladderlist_find_type(ladder_class_type);
	if(d2ladder_insert(d2ladder,pcharladderinfo)==1) {
		d2ladder_change_count++;
	}
	return 0;
}

int d2ladder_initladderfile(void)
{
	FILE * fdladder;
	t_d2ladderfile_ladderindex lhead[D2LADDER_MAXTYPE];
	t_d2ladderfile_header fileheader;
	int start;
	unsigned long maxtype;
	t_d2ladderfile_ladderinfo emptydata;
	unsigned int i,j, number;

	maxtype=D2LADDER_MAXTYPE;
	start=sizeof(t_d2ladderfile_header)+sizeof(lhead);
	for(i=0;i<D2LADDER_MAXTYPE;i++) {
		bn_int_set(&lhead[i].type,i);
		bn_int_set(&lhead[i].offset,start);
		if( i==D2LADDER_HC_OVERALL ||
			i==D2LADDER_STD_OVERALL ||
			i==D2LADDER_EXP_HC_OVERALL ||
			i==D2LADDER_EXP_STD_OVERALL) {
				number=D2LADDER_OVERALL_MAXNUM;
		} else if((i>D2LADDER_HC_OVERALL && i<=D2LADDER_HC_OVERALL+D2CHAR_CLASS_MAX +1) ||
			(i>D2LADDER_STD_OVERALL && i<=D2LADDER_STD_OVERALL+D2CHAR_CLASS_MAX +1) ||
			(i>D2LADDER_EXP_HC_OVERALL && i<=D2LADDER_EXP_HC_OVERALL+D2CHAR_EXP_CLASS_MAX +1) ||
			(i>D2LADDER_EXP_STD_OVERALL && i<=D2LADDER_EXP_STD_OVERALL+D2CHAR_EXP_CLASS_MAX +1)) {
				number=D2LADDER_MAXNUM;
		} else {
				number=0;
		}
		bn_int_set(&lhead[i].number,number);
		start += number*sizeof(emptydata);
	}
	memset(&emptydata,0,sizeof(emptydata));
	if (!d2ladder_ladder_file) return -1;
	fdladder=fopen(d2ladder_ladder_file,"wb");
	if(fdladder) {
		bn_int_set(&fileheader.maxtype,maxtype);
		bn_int_set(&fileheader.checksum,0);
		fwrite(&fileheader,1,sizeof(fileheader),fdladder);
		fwrite(lhead,1,sizeof(lhead),fdladder);
		for(i=0;i<maxtype;i++) {
			for(j=0;j<bn_int_get(lhead[i].number);j++) {
				fwrite(&emptydata,1,sizeof(emptydata),fdladder);
			}
		}
		fclose(fdladder);
		d2ladder_checksum_set();
	}
	else {
		eventlog(eventlog_level_error,__FUNCTION__,"error open ladder file %s",d2ladder_ladder_file);
		return -1;
	}
	return 0;
}

int d2ladder_find_pos(t_d2ladder * d2ladder, t_d2ladder_info * info)
{
	int	i;

	if (!d2ladder || !info) return -1;
	
	// only allow if the experience threshold is reached
	if (info->experience < prefs_get_ladderupdate_threshold()) return -1;
	
	i=d2ladder->len;
	while (i--) {
		if (d2ladder->info[i].experience > info->experience) {
			if (strncasecmp(d2ladder->info[i].charname,info->charname, MAX_CHARNAME_LEN)) {
				i++;
			}
			break;
		}
		if (i<=0) break;
	}
	return i;
}


int d2ladder_insert(t_d2ladder * d2ladder,t_d2ladder_info * info)
{
	int	oldpos, newpos;

	newpos=d2ladder_find_pos(d2ladder,info);
	/* we currectly do nothing when character is being kick out of ladder for simple */
	/*
	if (newpos<0 || newpos >= d2ladder->len) return 0;
	*/
	oldpos=d2ladder_find_char_all(d2ladder,info);
	return d2ladder_update_info_and_pos(d2ladder,info,oldpos,newpos);
}

int d2ladder_find_char_all(t_d2ladder * d2ladder, t_d2ladder_info * info)
{
	int		i;
	t_d2ladder_info * ladderdata;

	if (!d2ladder || !info) return -1;
	ladderdata=d2ladder->info;
	if (!ladderdata) return -1;
	i=d2ladder->len;
	while (i--) {
		if (!strncasecmp(ladderdata[i].charname,info->charname,MAX_CHARNAME_LEN)) return i;
	}
	return -1;
}

int d2ladder_update_info_and_pos(t_d2ladder * d2ladder, t_d2ladder_info * info, int oldpos, int newpos)
{
	int	i;
	int	direction;	
	int	outflag;
	t_d2ladder_info * ladderdata;

	if (!d2ladder || !info) return -1;
	ladderdata=d2ladder->info;
	if (!ladderdata) return -1;

	/* character not in ladder before */
	outflag=0;
	if (oldpos < 0 || oldpos >= (signed)d2ladder->len) {
		oldpos = d2ladder->len-1;
	}
	if (newpos < 0 || newpos >= (signed)d2ladder->len) {
		newpos = d2ladder->len-1;
		outflag = 1;
	}
	if ((oldpos == (signed)d2ladder->len -1) && outflag) {
		return 0;
	}
	if (newpos > oldpos && !outflag ) newpos--;
	direction = (newpos > oldpos)? 1: -1;
	for (i=oldpos; i!=newpos; i+=direction) {
		ladderdata[i] = ladderdata[i+direction];
	}
	ladderdata[i]=*info;
	return 1;
}


extern int d2ladder_rebuild(void)
{
	d2ladder_empty();
	d2ladder_need_rebuild = 0;
	return 0;
}

int d2ladder_check(void)
{
	if (!d2ladder_ladder_file) return -1;
	if (!d2ladder_backup_file) return -1;
	if(d2ladder_checksum_check()!=1) {
		eventlog(eventlog_level_error,__FUNCTION__,"ladder file checksum error,try to use backup file");
		if (p_rename(d2ladder_backup_file,d2ladder_ladder_file)==-1) {
			eventlog(eventlog_level_error,__FUNCTION__,"error rename %s to %s", d2ladder_backup_file,d2ladder_ladder_file);
		}
		if(d2ladder_checksum_check()!=1) {
			eventlog(eventlog_level_error,__FUNCTION__,"ladder backup file checksum error,rebuild ladder");
			if (d2ladder_initladderfile()<0) return -1;
			else {
				d2ladder_need_rebuild=1;
				return 0;
			}
		}
	}
	return 1;
}


t_d2ladder * d2ladderlist_find_type(unsigned int type)
{
	t_d2ladder *   d2ladder;
	t_elem const * elem;

	if (!d2ladder_list) {
		eventlog(eventlog_level_error,__FUNCTION__,"got NULL d2ladder_list");
		return NULL;
	}

	LIST_TRAVERSE_CONST(d2ladder_list,elem)
	{
		if (!(d2ladder=elem_get_data(elem))) continue;
		if (d2ladder->type==type) return d2ladder;
	}
	eventlog(eventlog_level_error,__FUNCTION__,"could not find type %d in d2ladder_list",type);
	return NULL;
}

extern int d2dbs_d2ladder_init(void)
{
	d2ladder_change_count=0;
	d2ladder_maxtype=0;
	d2ladder_ladder_file=xmalloc(strlen(d2dbs_prefs_get_ladder_dir())+1+
			  strlen(LADDER_FILE_PREFIX)+1+strlen(CLIENTTAG_DIABLO2DV)+1+10);
	d2ladder_backup_file=xmalloc(strlen(d2dbs_prefs_get_ladder_dir())+1+
			  strlen(LADDER_BACKUP_PREFIX)+1+strlen(CLIENTTAG_DIABLO2DV)+1+10);
	sprintf(d2ladder_ladder_file,"%s/%s.%s",d2dbs_prefs_get_ladder_dir(),\
		LADDER_FILE_PREFIX,CLIENTTAG_DIABLO2DV);

	sprintf(d2ladder_backup_file,"%s/%s.%s",d2dbs_prefs_get_ladder_dir(),\
		LADDER_BACKUP_PREFIX,CLIENTTAG_DIABLO2DV);

	if (d2ladderlist_init()<0) {
		return -1;
	}
	if(d2ladder_check()<0) {
		eventlog(eventlog_level_error,__FUNCTION__,"ladder file checking error");
		return -1;
	}
	if (d2ladder_readladder()<0) {
		return -1;
	}
	if (d2ladder_need_rebuild) d2ladder_rebuild();
	d2ladder_saveladder();
	return 0;
}

int d2ladderlist_init(void)
{
   	t_d2ladder 	* d2ladder;
	unsigned int 	i;


	if (!d2ladder_ladder_file) return -1;
	d2ladder_list=list_create();
	d2ladder_maxtype=D2LADDER_MAXTYPE;
	for (i=0;i<d2ladder_maxtype;i++) {
		d2ladder=xmalloc(sizeof(t_d2ladder));
		d2ladder->type=i;
		d2ladder->info=NULL;
		d2ladder->len=0;
		list_append_data(d2ladder_list,d2ladder);
	}
	return 0;
}

int d2ladder_readladder(void)
{
	t_d2ladder 		* d2ladder;
	t_d2ladderfile_header fileheader;
	FILE * 			fdladder;
	t_d2ladderfile_ladderindex 	* lhead;
	t_d2ladderfile_ladderinfo 	* ldata;
	t_d2ladder_info			* info;
	t_d2ladder_info			temp;
	long 			leftsize,blocksize;
	unsigned int		laddertype;
	unsigned int		tempmaxtype;
	int 			readlen;
	unsigned int			i, number;

	if (!d2ladder_ladder_file) return -1;
	fdladder=fopen(d2ladder_ladder_file,"rb");
	if(!fdladder) {
		eventlog(eventlog_level_error,__FUNCTION__,"canot open ladder file");
		return -1;
	}

	fseek(fdladder,0,SEEK_END);
	leftsize=ftell(fdladder);
	rewind(fdladder);

	blocksize=sizeof(fileheader) ;
	if (leftsize<blocksize) {
		eventlog(eventlog_level_error,__FUNCTION__,"file size error");
		fclose(fdladder);
		return -1;
	}

	readlen=fread(&fileheader,1,sizeof(fileheader),fdladder);
	if (readlen<=0) {
		eventlog(eventlog_level_error,__FUNCTION__,"file %s read error(read:%s)",d2ladder_ladder_file,pstrerror(errno));
		fclose(fdladder);
		return -1;
	}
	tempmaxtype=bn_int_get(fileheader.maxtype);
	leftsize-=blocksize;

	if(tempmaxtype>D2LADDER_MAXTYPE) {
		eventlog(eventlog_level_error,__FUNCTION__,"ladder type > D2LADDER_MAXTYPE error");
		fclose(fdladder);
		return -1;
	}
	d2ladder_maxtype=tempmaxtype;

	blocksize=d2ladder_maxtype*sizeof(*lhead);
	if (leftsize < blocksize ) {
		eventlog(eventlog_level_error,__FUNCTION__,"file size error");
		fclose(fdladder);
		return -1;
	}

	lhead=xmalloc(blocksize);
	readlen=fread(lhead,1,d2ladder_maxtype*sizeof(*lhead),fdladder);
	if (readlen<=0) {
		eventlog(eventlog_level_error,__FUNCTION__,"file %s read error(read:%s)",d2ladder_ladder_file,pstrerror(errno));
		xfree(lhead);
		fclose(fdladder);
		return -1;
	}
	leftsize-=blocksize;

	blocksize=0;
	for(i=0;i<d2ladder_maxtype;i++) {
		blocksize+=bn_int_get(lhead[i].number)*sizeof(*ldata);
	}
	if (leftsize < blocksize ) {
		eventlog(eventlog_level_error,__FUNCTION__,"file size error");
		xfree(lhead);
		fclose(fdladder);
		return -1;
	}

	for(laddertype=0;laddertype<d2ladder_maxtype;laddertype++) {
		number= bn_int_get(lhead[laddertype].number);
		if(number<=0) continue;
		d2ladder=d2ladderlist_find_type(laddertype);
		if (!d2ladder) {
			eventlog(eventlog_level_error,__FUNCTION__,"could not find ladder type %d",laddertype);
			continue;
		}