/*
    state.c - Portable Rogue Save State Code

    Copyright (C) 1999, 2000, 2005 Nicholas J. Kisseberth
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. Neither the name(s) of the author(s) nor the names of other contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS ``AS IS'' AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
*/

/************************************************************************/
/* Save State Code                                                      */
/************************************************************************/

#define RSID_STATS        0xABCD0001
#define RSID_MSTATS       0xABCD0002
#define RSID_THING        0xABCD0003
#define RSID_OBJECT       0xABCD0004
#define RSID_MAGICITEMS   0xABCD0005
#define RSID_KNOWS        0xABCD0006
#define RSID_GUESSES      0xABCD0007
#define RSID_OBJECTLIST   0xABCD0008
#define RSID_BAGOBJECT    0xABCD0009
#define RSID_MONSTERLIST  0xABCD000A
#define RSID_MONSTERSTATS 0xABCD000B
#define RSID_MONSTERS     0xABCD000C
#define RSID_TRAP         0xABCD000D
#define RSID_WINDOW       0xABCD000E
#define RSID_DAEMONS      0xABCD000F
#define RSID_STICKS       0xABCD0010
#define RSID_IARMOR       0xABCD0011
#define RSID_SPELLS       0xABCD0012
#define RSID_ILIST        0xABCD0013
#define RSID_HLIST        0xABCD0014
#define RSID_DEATHTYPE    0xABCD0015
#define RSID_CTYPES       0XABCD0016
#define RSID_COORDLIST    0XABCD0017
#define RSID_ROOMS        0XABCD0018

#include <curses.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rogue.h"

int rs_read_int(FILE *inf, int *i);
int rs_write_int(FILE *savef, int c);
int list_size(struct linked_list *l);
int rs_write_object_list(FILE *savef, struct linked_list *l);
int rs_read_object_list(FILE *inf, struct linked_list **list);

#define READSTAT (format_error || read_error )
#define WRITESTAT (write_error)

static int read_error   = FALSE;
static int write_error  = FALSE;
static int format_error = FALSE;
static int endian = 0x01020304;
#define  big_endian ( *((char *)&endian) == 0x01 )

int
rs_write(FILE *savef, void *ptr, size_t size)
{
    if (write_error)
        return(WRITESTAT);

    if (encwrite(ptr, size, savef) != size)
        write_error = 1;

    return(WRITESTAT);
}

int
rs_read(FILE *inf, void *ptr, size_t size)
{
    if (read_error || format_error)
        return(READSTAT);

    if (encread(ptr, size, inf) != size)
        read_error = 1;
       
    return(READSTAT);
}

int
rs_write_uchar(FILE *savef, unsigned char c)
{
    if (write_error)
        return(WRITESTAT);

    rs_write(savef, &c, 1);

    return(WRITESTAT);
}

int
rs_read_uchar(FILE *inf, unsigned char *c)
{
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, c, 1);

    return(READSTAT);
}

int
rs_write_char(FILE *savef, char c)
{
    if (write_error)
        return(WRITESTAT);

    rs_write(savef, &c, 1);

    return(WRITESTAT);
}

int
rs_read_char(FILE *inf, char *c)
{
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, c, 1);

    return(READSTAT);
}

int
rs_write_chars(FILE *savef, char *c, int count)
{
    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, count);
    rs_write(savef, c, count);

    return(WRITESTAT);
}

int
rs_read_chars(FILE *inf, char *i, int count)
{
    int value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &value);
    
    if (value != count)
        format_error = TRUE;

    rs_read(inf, i, count);
    
    return(READSTAT);
}

int
rs_write_int(FILE *savef, int c)
{
    unsigned char bytes[4];
    unsigned char *buf = (unsigned char *) &c;

    if (write_error)
        return(WRITESTAT);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    rs_write(savef, buf, 4);

    return(WRITESTAT);
}

int
rs_read_int(FILE *inf, int *i)
{
    unsigned char bytes[4];
    int input = 0;
    unsigned char *buf = (unsigned char *)&input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 4);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    *i = *((int *) buf);

    return(READSTAT);
}

int
rs_write_ints(FILE *savef, int *c, int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, count);

    for(n = 0; n < count; n++)
        if( rs_write_int(savef,c[n]) != 0)
            break;

    return(WRITESTAT);
}

int
rs_read_ints(FILE *inf, int *i, int count)
{
    int n, value;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < count; n++)
        if (rs_read_int(inf, &i[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_boolean(FILE *savef, bool c)
{
    unsigned char buf = (c == 0) ? 0 : 1;
    
    if (write_error)
        return(WRITESTAT);

    rs_write(savef, &buf, 1);

    return(WRITESTAT);
}

int
rs_read_boolean(FILE *inf, bool *i)
{
    unsigned char buf = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &buf, 1);

    *i = (buf != 0);
    
    return(READSTAT);
}

int
rs_write_booleans(FILE *savef, bool *c, int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, count);

    for(n = 0; n < count; n++)
        if (rs_write_boolean(savef, c[n]) != 0)
            break;

    return(WRITESTAT);
}

int
rs_read_booleans(FILE *inf, bool *i, int count)
{
    int n = 0, value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < count; n++)
        if (rs_read_boolean(inf, &i[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_short(FILE *savef, short c)
{
    unsigned char bytes[2];
    unsigned char *buf = (unsigned char *) &c;

    if (write_error)
        return(WRITESTAT);

    if (big_endian)
    {
        bytes[1] = buf[0];
        bytes[0] = buf[1];
        buf = bytes;
    }

    rs_write(savef, buf, 2);

    return(WRITESTAT);
}

int
rs_read_short(FILE *inf, short *i)
{
    unsigned char bytes[2];
    short  input;
    unsigned char *buf = (unsigned char *)&input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 2);

    if (big_endian)
    {
        bytes[1] = buf[0];
        bytes[0] = buf[1];
        buf = bytes;
    }
    
    *i = *((short *) buf);

    return(READSTAT);
} 

int
rs_write_shorts(FILE *savef, short *c, int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, count);

    for(n = 0; n < count; n++)
        if (rs_write_short(savef, c[n]) != 0)
            break; 

    return(WRITESTAT);
}

int
rs_read_shorts(FILE *inf, short *i, int count)
{
    int n = 0, value = 0;

    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < value; n++)
        if (rs_read_short(inf, &i[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_ushort(FILE *savef, unsigned short c)
{
    unsigned char bytes[2];
    unsigned char *buf = (unsigned char *) &c;

    if (write_error)
        return(WRITESTAT);

    if (big_endian)
    {
        bytes[1] = buf[0];
        bytes[0] = buf[1];
        buf = bytes;
    }

    rs_write(savef, buf, 2);

    return(WRITESTAT);
}

int
rs_read_ushort(FILE *inf, unsigned short *i)
{
    unsigned char bytes[2];
    unsigned short  input;
    unsigned char *buf = (unsigned char *)&input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 2);

    if (big_endian)
    {
        bytes[1] = buf[0];
        bytes[0] = buf[1];
        buf = bytes;
    }
    
    *i = *((unsigned short *) buf);

    return(READSTAT);
} 

int
rs_write_uint(FILE *savef, unsigned int c)
{
    unsigned char bytes[4];
    unsigned char *buf = (unsigned char *) &c;

    if (write_error)
        return(WRITESTAT);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    rs_write(savef, buf, 4);

    return(WRITESTAT);
}

int
rs_read_uint(FILE *inf, unsigned int *i)
{
    unsigned char bytes[4];
    int  input;
    unsigned char *buf = (unsigned char *)&input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 4);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    *i = *((unsigned int *) buf);

    return(READSTAT);
}

int
rs_write_long(FILE *savef, long c)
{
    int c2;
    unsigned char bytes[4];
    unsigned char *buf = (unsigned char *)&c;

    if (write_error)
        return(WRITESTAT);

    if (sizeof(long) == 8)
    {
        c2 = c;
        buf = (unsigned char *) &c2;
    }

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    rs_write(savef, buf, 4);

    return(WRITESTAT);
}

int
rs_read_long(FILE *inf, long *i)
{
    unsigned char bytes[4];
    long input;
    unsigned char *buf = (unsigned char *) &input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 4);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    *i = *((long *) buf);

    return(READSTAT);
}

int
rs_write_longs(FILE *savef, long *c, int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef,count);
    
    for(n = 0; n < count; n++)
        rs_write_long(savef, c[n]);

    return(WRITESTAT);
}

int
rs_read_longs(FILE *inf, long *i, int count)
{
    int n = 0, value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < value; n++)
        if (rs_read_long(inf, &i[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_ulong(FILE *savef, unsigned long c)
{
    unsigned int c2;
    unsigned char bytes[4];
    unsigned char *buf = (unsigned char *)&c;

    if (write_error)
        return(WRITESTAT);

    if ( (sizeof(long) == 8) && (sizeof(int) == 4) )
    {
        c2 = c;
        buf = (unsigned char *) &c2;
    }

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    rs_write(savef, buf, 4);

    return(WRITESTAT);
}

int
rs_read_ulong(FILE *inf, unsigned long *i)
{
    unsigned char bytes[4];
    unsigned long input;
    unsigned char *buf = (unsigned char *) &input;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read(inf, &input, 4);

    if (big_endian)
    {
        bytes[3] = buf[0];
        bytes[2] = buf[1];
        bytes[1] = buf[2];
        bytes[0] = buf[3];
        buf = bytes;
    }
    
    if ( (sizeof(long) == 8) && (sizeof(int) == 4) )
      *i = *((unsigned int *) buf);
    else
      *i = *((unsigned long *) buf);

    return(READSTAT);
}

int
rs_write_ulongs(FILE *savef, unsigned long *c, int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef,count);

    for(n = 0; n < count; n++)
        if (rs_write_ulong(savef,c[n]) != 0)
            break;

    return(WRITESTAT);
}

int
rs_read_ulongs(FILE *inf, unsigned long *i, int count)
{
    int n = 0, value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < count; n++)
        if (rs_read_ulong(inf, &i[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_marker(FILE *savef, int id)
{
    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, id);

    return(WRITESTAT);
}

int 
rs_read_marker(FILE *inf, int id)
{
    int nid;

    if (read_error || format_error)
        return(READSTAT);

    if (rs_read_int(inf, &nid) == 0)
        if (id != nid)
            format_error = 1;
    
    return(READSTAT);
}



/******************************************************************************/

int
rs_write_string(FILE *savef, char *s)
{
    int len = 0;

    if (write_error)
        return(WRITESTAT);

    len = (s == NULL) ? 0 : (int) strlen(s) + 1;

    rs_write_int(savef, len);
    rs_write_chars(savef, s, len);
            
    return(WRITESTAT);
}

int
rs_read_string(FILE *inf, char *s, int max)
{
    int len = 0;

    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &len);

    if (len > max)
        format_error = TRUE;

    rs_read_chars(inf, s, len);
    
    return(READSTAT);
}

int
rs_read_new_string(FILE *inf, char **s)
{
    int len=0;
    char *buf=0;

    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &len);

    if (len == 0)
        buf = NULL;
    else
    { 
        buf = malloc(len);

        if (buf == NULL)            
            read_error = TRUE;
    }

    rs_read_chars(inf, buf, len);

    *s = buf;

    return(READSTAT);
}

int
rs_write_strings(FILE *savef, char *s[], int count)
{
    int n = 0;

    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, count);

    for(n = 0; n < count; n++)
        if (rs_write_string(savef, s[n]) != 0)
            break;
    
    return(WRITESTAT);
}

int
rs_read_strings(FILE *inf, char **s, int count, int max)
{
    int n     = 0;
    int value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < count; n++)
        if (rs_read_string(inf, s[n], max) != 0)
            break;
    
    return(READSTAT);
}

int
rs_read_new_strings(FILE *inf, char **s, int count)
{
    int n     = 0;
    int value = 0;
    
    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &value);

    if (value != count)
        format_error = TRUE;

    for(n = 0; n < count; n++)
        if (rs_read_new_string(inf, &s[n]) != 0)
            break;
    
    return(READSTAT);
}

int
rs_write_string_index(FILE *savef, char *master[], int max, const char *str)
{
    int i;

    if (write_error)
        return(WRITESTAT);

    for(i = 0; i < max; i++)
        if (str == master[i])
            return( rs_write_int(savef, i) );

    return( rs_write_int(savef,-1) );
}

int
rs_read_string_index(FILE *inf, char *master[], int maxindex, char **str)
{
    int i;

    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf, &i);

    if (i > maxindex)
        format_error = TRUE;
    else if (i >= 0)
        *str = master[i];
    else
        *str = NULL;

    return(READSTAT);
}

int
rs_write_coord(FILE *savef, coord c)
{
    if (write_error)
        return(WRITESTAT);

    rs_write_int(savef, c.x);
    rs_write_int(savef, c.y);
    
    return(WRITESTAT);
}

int
rs_read_coord(FILE *inf, coord *c)
{
    coord in;

    if (read_error || format_error)
        return(READSTAT);

    rs_read_int(inf,&in.x);
    rs_read_int(inf,&in.y);

    if (READSTAT == 0) 
    {
        c->x = in.x;
        c->y = in.y;
    }

    return(READSTAT);
}

int
rs_write_coord_list(FILE *savef, struct linked_list *l)
{
    rs_write_marker(savef, RSID_COORDLIST);
    rs_write_int(savef, list_size(l));

    while (l != NULL) 
    {
        rs_write_coord(savef, *(coord *) l->l_data);
        l = l->l_next;
    }
    
    return(WRITESTAT);
}

int
rs_read_coord_list(FILE *inf, struct linked_list **list)
{
    int i, cnt;
    struct linked_list *l = NULL, *previous = NULL, *head = NULL;

    rs_read_marker(inf, RSID_COORDLIST);

    if (rs_read_int(inf,&cnt) != 0)
	return(READSTAT);

    for (i = 0; i < cnt; i++)
    {
	l = new_item(sizeof(coord));
        l->l_prev = previous;

        if (previous != NULL)
	    previous->l_next = l;

        rs_read_coord(inf,(coord *) l->l_data);

	if (previous == NULL)
	    head = l;
                
	previous = l;
    }
            
    if (l != NULL)
	l->l_next = NULL;
    
    *list = head;

    return(READSTAT);
}

int
rs_write_window(FILE *savef, WINDOW *win)
{
    int row,col,height,width;

    if (write_error)
        return(WRITESTAT);

    width  = getmaxx(win);
    height = getmaxy(win);

    rs_write_marker(savef,RSID_WINDOW);
    rs_write_int(savef,height);
    rs_write_int(savef,width);

    for(row=0;row<height;row++)
        for(col=0;col<width;col++)
            if (rs_write_int(savef, mvwinch(win,row,col)) != 0)
                return(WRITESTAT);

    return(WRITESTAT);
}