/*
    state.c - Portable Rogue Save State Code
    
    Copyright (C) 2000 Nicholas J. Kisseberth
   
    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.
*/

#define RSXR_STATS        0xABCD0001
#define RSXR_THING        0xABCD0002
#define RSXR_OBJECT       0xABCD0003
#define RSXR_MAGICITEMS   0xABCD0004
#define RSXR_KNOWS        0xABCD0005
#define RSXR_GUESSES      0xABCD0006
#define RSXR_OBJECTLIST   0xABCD0007
#define RSXR_BAGOBJECT    0xABCD0008
#define RSXR_MONSTERLIST  0xABCD0009
#define RSXR_MONSTERSTATS 0xABCD000A
#define RSXR_MONSTERS     0xABCD000B
#define RSXR_TRAP         0xABCD000C
#define RSXR_WINDOW       0xABCD000D
#define RSXR_DAEMONS      0xABCD000E
#define RSXR_IWEAPS       0xABCD000F
#define RSXR_IARMOR       0xABCD0010
#define RSXR_SPELLS       0xABCD0011
#define RSXR_ILIST        0xABCD0012
#define RSXR_HLIST        0xABCD0013
#define RSXR_DEATHTYPE    0xABCD0014
#define RSXR_CTYPES       0XABCD0015
#define RSXR_COORDLIST    0XABCD0016
#define RSXR_ROOMS        0XABCD0017

#if defined(_WIN32)
#include <Windows.h>
#include <Lmcons.h>
#include <shlobj.h>
#include <Shlwapi.h>
#undef VOID
#undef MOUSE_MOVED
#elif defined(__DJGPP__)
#include <process.h>
#else
#include <pwd.h>
#include <sys/utsname.h>
#include <unistd.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <curses.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <fcntl.h>
#include <limits.h>
#include <time.h>
#include <signal.h>
#include "rogue.h"
#include "mach_dep.h"

#if defined(_WIN32)
#include <process.h>
#endif

int md_fileno(FILE *fp);

#define READSTAT ((format_error == 0) && (read_error == 0))
#define WRITESTAT (write_error == 0)

int read_error   = FALSE;
int write_error  = FALSE;
int format_error = FALSE;

int save_debug = FALSE;
#define DBG(x)   {if (save_debug) rsPrintf x;}

int
rsPrintf(char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr,fmt, ap);
    va_end(ap); 

    return(0);
}


void *
get_list_item(struct linked_list *l, int i)
{
    int count = 0;

    while(l != NULL)
    {   
        if (count == i)
            return(l->l_data);
                        
        l = l->l_next;
        
        count++;
    }
    
    return(NULL);
}

rs_write(FILE *savef, void *ptr, size_t size)
{
    size_t i = 0;
    
    if (!write_error)
        i = ENCWRITE(ptr,size,savef);
    if (i != size)
        write_error = TRUE;

    assert(write_error == 0);
    return(WRITESTAT);
}

int end_of_file = FALSE;

rs_read(int inf, void *ptr, size_t size)
{
    int actual;
    end_of_file =FALSE;
    if (!read_error && !format_error)
    {
        actual = ENCREAD(ptr, size, inf);

        if ((actual == 0) && (size != 0))
           end_of_file = TRUE;
    }
       
    if (read_error){
        printf("read error has occurred. restore short-circuited.\n");abort();}
    if (format_error)
        {printf("game format invalid. restore short-circuited.\n");abort();}

    return(READSTAT);
}

int big_endian = 0;

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

    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);
}

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

    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);
}

rs_write_ulong(FILE *savef, unsigned long c)
{
    unsigned int c2;
    char bytes[4];
    char *buf = (char *)&c;
    
    if ( (sizeof(long) == 8) && (sizeof(int) == 4) )
    {
        c2 = c;
        buf = (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);
}

rs_write_long(FILE *savef, long c)
{
    int c2;
    char bytes[4];
    char *buf = (char *)&c;
    
    if ( (sizeof(long) == 8) && (sizeof(int) == 4) )
    {
        c2 = c;
        buf = (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);
}

rs_write_boolean(FILE *savef, bool c)
{
    char buf;
    
    if (c == 0)
        buf = 0;
    else
        buf = 1;
    
    rs_write(savef, &buf, 1);

    return(WRITESTAT);
}

rs_read_int(int inf, int *i)
{
    char bytes[4];
    int  input;
    char *buf = (char *)&input;
    
    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);
}

rs_read_uint(int inf, unsigned int *i)
{
    char bytes[4];
    int  input;
    char *buf = (char *)&input;
    
    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);
}

rs_read_ulong(int inf, unsigned long *i)
{
    char bytes[4];
    unsigned long input;
    char *buf = (char *) &input;
    
    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);
}

rs_read_long(int inf, long *i)
{
    char bytes[4];
    long input;
    char *buf = (char *) &input;
    
    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 = *((int *) buf);
    else
      *i = *((long *) buf);
    return(READSTAT);
}

rs_read_boolean(int inf, bool *i)
{
    char buf;
    
    rs_read(inf, &buf, 1);
    
    *i = buf;
    
    return(READSTAT);
}

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

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

    return(WRITESTAT);
}

rs_write_short(FILE *savef, short c)
{
    char bytes[2];
    char *buf = (char *) &c;
    
    if (big_endian)
    {
        bytes[1] = buf[0];
        bytes[0] = buf[1];
        buf = bytes;
    }
    
    rs_write(savef, buf, 2);

    return(WRITESTAT);
}

rs_read_short(int inf, short *s)
{
    char  bytes[2];
    short input;
    char *buf = (char *)&input;
    
    rs_read(inf, &input, 2);

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


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

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

    return(WRITESTAT);
}

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

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

    return(WRITESTAT);
}

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

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

    return(WRITESTAT);
}

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

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

    return(WRITESTAT);
}

rs_read_ints(int inf, int *i, int count)
{
    int n=0,value=0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
            format_error = TRUE;
        else
        {
            for(n=0;n<value;n++)
                rs_read_int(inf, &i[n]);
        }
    }
    
    return(READSTAT);
}

rs_read_shorts(int inf, short *i, int count)
{
    int n=0,value=0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
            format_error = TRUE;
        else
        {
            for(n=0;n<value;n++)
                rs_read_short(inf, &i[n]);
        }
    }
    
    return(READSTAT);
}

rs_read_longs(int inf, long *i, int count)
{
    int n=0,value=0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
            format_error = TRUE;
        else
        {
            for(n=0;n<value;n++)
                rs_read_long(inf, &i[n]);
        }
    }
    
    return(READSTAT);
}

rs_read_ulongs(int inf, unsigned long *i, int count)
{
    int n=0,value=0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
            format_error = TRUE;
        else
        {
            for(n=0;n<value;n++)
                rs_read_ulong(inf, &i[n]);
        }
    }
    
    return(READSTAT);
}

rs_read_booleans(int inf, bool *i, int count)
{
    int n=0,value=0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
            format_error = TRUE;
        else
        {
            for(n=0;n<value;n++)
                rs_read_boolean(inf, &i[n]);
        }
    }
    
    return(READSTAT);
}

rs_write_levtype(FILE *savef, LEVTYPE c)
{
    int lt;
    
    switch(c)
    {
        case NORMLEV: lt = 1; break;
        case POSTLEV: lt = 2; break;
        case MAZELEV: lt = 3; break;
        case OUTSIDE: lt = 4; break;
        case STARTLEV: lt = 5; break;
        default: lt = -1; break;
    }
    
    rs_write_int(savef,lt);
        
    return(WRITESTAT);
}

rs_read_levtype(int inf, LEVTYPE *l)
{
    int lt;
    
    rs_read_int(inf, &lt);
    
    switch(lt)
    {
        case 1: *l = NORMLEV; break;
        case 2: *l = POSTLEV; break;
        case 3: *l = MAZELEV; break;
        case 4: *l = OUTSIDE; break;
        case 5: *l = STARTLEV; break;
        default: *l = NORMLEV; break;
    }
    
    return(READSTAT);
}

rs_write_char(FILE *savef, char c)
{
    rs_write(savef, &c, 1);
    DBG(("%c",c));    
    
    return(WRITESTAT);
}

rs_read_char(int inf, char *c)
{
    rs_read(inf, c, 1);
    
    return(READSTAT);
}

rs_write_uchar(FILE *savef, unsigned char c)
{
    rs_write(savef, &c, 1);
    DBG(("%c",c));    
    
    return(WRITESTAT);
}

rs_read_uchar(int inf, unsigned char *c)
{
    rs_read(inf, c, 1);
    
    return(READSTAT);
}

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

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

    rs_write_uint(savef, (unsigned int) len);
    rs_write(savef, s, len);
            
    return(WRITESTAT);
}

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

    if (rs_read_int(inf,&i) != 0)
    {
        if (i > maxindex)
        {
            printf("String index is out of range. %d > %d\n",      
                i, maxindex);
            printf("Sorry, invalid save game format\n");
            format_error = TRUE;
        }
        else if (i >= 0)
            *str = master[i].w_string;
        else
            *str = NULL;
    }
    return(READSTAT);
}

rs_write_string_index(FILE *savef, struct words master[], int maxindex, char *str)
{
    int i;

    for(i = 0; i < maxindex; i++)
    {
        if (str == master[i].w_string)
        {
            rs_write_int(savef,i);
            return(WRITESTAT);
        }
    }

    rs_write_int(savef,-1);
    return(WRITESTAT);
}
 
rs_read_scrolls(int inf)
{
    int i;

    for(i = 0; i < MAXSCROLLS; i++)
    {
        rs_read_new_string(inf,&s_names[i]);
        rs_read_boolean(inf,&s_know[i]);
        rs_read_new_string(inf,&s_guess[i]);
    }

    return(READSTAT);
}

rs_write_scrolls(FILE *savef)
{
    int i;

    for(i = 0; i < MAXSCROLLS; i++)
    {
        rs_write_string(savef,s_names[i]);
        rs_write_boolean(savef,s_know[i]);
        rs_write_string(savef,s_guess[i]);
    }
    return(READSTAT);
}

rs_read_potions(int inf)
{
    int i;

    for(i = 0; i < MAXPOTIONS; i++)
    {
        rs_read_string_index(inf,rainbow,NCOLORS,&p_colors[i]);
        rs_read_boolean(inf,&p_know[i]);
        rs_read_new_string(inf,&p_guess[i]);
    }

    return(READSTAT);
}

rs_write_potions(FILE *savef)
{
    int i;

    for(i = 0; i < MAXPOTIONS; i++)
    {
        rs_write_string_index(savef,rainbow,NCOLORS,p_colors[i]);
        rs_write_boolean(savef,p_know[i]);
        rs_write_string(savef,p_guess[i]);
    }

    return(WRITESTAT);
}

rs_read_rings(int inf)
{
    int i;

    for(i = 0; i < MAXRINGS; i++)
    {
        rs_read_string_index(inf,stones,NSTONES,&r_stones[i]);
        rs_read_boolean(inf,&r_know[i]);
        rs_read_new_string(inf,&r_guess[i]);
    }

    return(READSTAT);
}

rs_write_rings(FILE *savef)
{
    int i;

    for(i = 0; i < MAXRINGS; i++)
    {
        rs_write_string_index(savef,stones,NSTONES,r_stones[i]);
        rs_write_boolean(savef,r_know[i]);
        rs_write_string(savef,r_guess[i]);
    }

    return(WRITESTAT);
}

rs_read_misc(int inf)
{
    int i;

    for(i = 0; i < MAXMM; i++)
    {
        rs_read_boolean(inf,&m_know[i]);
        rs_read_new_string(inf,&m_guess[i]);
    }

    return(READSTAT);
}

rs_write_misc(FILE *savef)
{
    int i;

    for(i = 0; i < MAXMM; i++)
    {
        rs_write_boolean(savef,m_know[i]);
        rs_write_string(savef,m_guess[i]);
    }

    return(WRITESTAT);
}

rs_write_sticks(FILE *savef)
{
    int i;

    for (i = 0; i < MAXSTICKS; i++)
    {
        if (strcmp(ws_type[i],"staff") == 0)
        {
            rs_write_int(savef,0);
            rs_write_string_index(savef, wood, NWOOD, ws_made[i]);
        }
        else
        {
            rs_write_int(savef,1);
            rs_write_string_index(savef, metal, NMETAL, ws_made[i]);
        }
        rs_write_boolean(savef, ws_know[i]);
        rs_write_string(savef, ws_guess[i]);
    }
 
    return(WRITESTAT);
}
        
rs_read_sticks(int inf)
{
    int i = 0, list = 0;

    for(i = 0; i < MAXSTICKS; i++)
    { 
        rs_read_int(inf,&list);
        if (list == 0)
        {
            rs_read_string_index(inf,wood,NWOOD,&ws_made[i]);
            ws_type[i] = "staff";
        }
        else 
        {
            rs_read_string_index(inf,metal,NMETAL,&ws_made[i]);
            ws_type[i] = "wand";
        }
        rs_read_boolean(inf, &ws_know[i]);
        rs_read_new_string(inf, &ws_guess[i]);
    }

    return(READSTAT);
}
    
rs_read_string(int inf, char *s, int max)
{
    int len = 0;

    if (rs_read_int(inf, &len) != FALSE)
    {
        if (len > max)
        {
            printf("String too long to restore. %d > %d\n",len,max);
            printf("Sorry, invalid save game format\n");
            format_error = TRUE;
        }
    
        rs_read(inf, s, len);
    }
    
    return(READSTAT);
}

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

    if (rs_read_int(inf, &len) != 0)
    {
        if (len == 0)
            *s = NULL;
        else
        { 
            buf = malloc(len);

            if (buf == NULL)            
                read_error = TRUE;
            else
            {
                rs_read(inf, buf, len);
                *s = buf;
            }
        }
    }

    return(READSTAT);
}

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

    rs_write_int(savef,count);

    for(n = 0; n < count; n++)
    {
        len = (s[n] == NULL) ? 0L : (int) strlen(s[n]) + 1;
        rs_write_int(savef, len);
        rs_write(savef, s[n], len);
        DBG(("%s",s[n]));
    }
    
    return(WRITESTAT);
}

rs_write_words(FILE *savef, struct words *w, int count)
{
    int n = 0;

    rs_write_int(savef,count);

    for(n = 0; n < count; n++)
    {
        rs_write(savef, w[n].w_string, sizeof(w[n].w_string));
        DBG(("%s",w[n].w_string));
    }
    
    return(WRITESTAT);
}

rs_read_words(int inf, struct words *w, int count)
{
    int n = 0;
    int value = 0;

    rs_read_int(inf,&value);

    if (value != count)
    {
        printf("Incorrect number of words in block. %d != %d.",
                value,count);
        printf("Sorry, invalid save game format");
        format_error = TRUE;
    }
    else for(n = 0; n < count; n++)
    {
        rs_read(inf, w[n].w_string, sizeof(w[n].w_string));
    }
    
    return(READSTAT);
}

rs_read_new_strings(int inf, char **s, int count)
{
    int len   = 0;
    int n     = 0;
    int value = 0;
    
    if (rs_read_int(inf,&value) != 0)
    {
        if (value != count)
        {
            printf("Incorrect number of strings in block. %d > %d.",
                value,count);
            printf("Sorry, invalid save game format");
            format_error = TRUE;
        }
        else
            for(n=0; n<value; n++)
            {
                rs_read_int(inf, &len);
            
                if (len == 0)
                    s[n]=0;
                else 
                {
                    s[n] = malloc(len);
                    rs_read(inf,s[n],len);
                }
            }
    }