sys/src/games/gb/state.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <thread.h>
   4 #include <draw.h>
   5 #include "dat.h"
   6 #include "fns.h"
   7
   8 static int fd;
   9
  10 static void
  11 put8(u8int i)
  12 {
  13         write(fd, &i, 1);
  14 }
  15
  16 static void
  17 put16(u16int i)
  18 {
  19         put8(i);
  20         put8(i >> 8);
  21 }
  22
  23 static void
  24 put32(u32int i)
  25 {
  26         put8(i);
  27         put8(i >> 8);
  28         put8(i >> 16);
  29         put8(i >> 24);
  30 }
  31
  32 static int
  33 get8(void)
  34 {
  35         u8int c;
  36
  37         read(fd, &c, 1);
  38         return c;
  39 }
  40
  41 static int
  42 get16(void)
  43 {
  44         int i;
  45
  46         i = get8();
  47         i |= get8() << 8;
  48         return i;
  49 }
  50
  51 static int
  52 get32(void)
  53 {
  54         int i;
  55
  56         i = get8();
  57         i |= get8() << 8;
  58         i |= get8() << 16;
  59         i |= get8() << 24;
  60         return i;
  61 }
  62
  63 void
  64 loadstate(char *file)
  65 {
  66         flushram();
  67         fd = open(file, OREAD);
  68         if(fd < 0){
  69                 message("open: %r");
  70                 return;
  71         }
  72         read(fd, mem, 65536);
  73         if(ram != nil)
  74                 read(fd, ram, rambanks * 8192);
  75         read(fd, R, sizeof R);
  76         sp = get16();
  77         pc = get16();
  78         Fl = get8();
  79         halt = get32();
  80         IME = get32();
  81         clock = get32();
  82         ppuclock = get32();
  83         divclock = get32();
  84         timerclock = get32();
  85         timerfreq = get32();
  86         timer = get32();
  87         rombank = get32();
  88         rambank = get32();
  89         ramen = get32();
  90         battery = get32();
  91         ramrom = get32();
  92         close(fd);
  93 }
  94
  95 void
  96 savestate(char *file)
  97 {
  98         flushram();
  99         fd = create(file, ORDWR, 0666);
 100         if(fd < 0){
 101                 message("create: %r");
 102                 return;
 103         }
 104         write(fd, mem, 65536);
 105         if(ram != nil)
 106                 write(fd, ram, rambanks * 8192);
 107         write(fd, R, sizeof R);
 108         put16(sp);
 109         put16(pc);
 110         put8(Fl);
 111         put32(halt);
 112         put32(IME);
 113         put32(clock);
 114         put32(ppuclock);
 115         put32(divclock);
 116         put32(timerclock);
 117         put32(timerfreq);
 118         put32(timer);
 119         put32(rombank);
 120         put32(rambank);
 121         put32(ramen);
 122         put32(battery);
 123         put32(ramrom);
 124         close(fd);
 125 }