ref: 6efb7620e6d765837b5a1758297cdfe8242911a2
dir: /sys/src/games/gb/state.c/
#include <u.h> #include <libc.h> #include <thread.h> #include <draw.h> #include <bio.h> #include "dat.h" #include "fns.h" extern Var cpuvars[], ppuvars[], memvars[], apuvars[], evvars[]; extern Event *events[NEVENT], *elist; static Biobuf *bp; Var apuvars[] = {{nil, 0, 0}}; static void putevents(void) { int i, j; Event *e; for(i = 0; i < NEVENT; i++) if(elist == events[i]) break; if(i == NEVENT && elist != nil) print("unknown event %p in chain\n", elist); Bputc(bp, i); for(i = 0; i < NEVENT; i++){ e = events[i]; Bputc(bp, e->time); Bputc(bp, e->time >> 8); Bputc(bp, e->time >> 16); Bputc(bp, e->time >> 24); for(j = 0; j < NEVENT; j++) if(e->next == events[j]) break; if(j == NEVENT && e->next != nil) print("unknown event %p in chain\n", e->next); Bputc(bp, j); } } static void getevents(void) { int i, j; Event *e; i = Bgetc(bp); elist = i >= NEVENT ? nil : events[i]; for(i = 0; i < NEVENT; i++){ e = events[i]; e->time = Bgetc(bp); e->time |= Bgetc(bp) << 8; e->time |= Bgetc(bp) << 16; e->time |= Bgetc(bp) << 24; j = Bgetc(bp); e->next = j >= NEVENT ? nil : events[j]; } } void getvars(Var *v) { int n; u16int *p, w; u32int *q, l; for(; v->a != nil; v++) switch(v->s){ case 1: Bread(bp, v->a, v->n); break; case 2: n = v->n; p = v->a; while(n--){ w = Bgetc(bp); *p++ = w | Bgetc(bp) << 8; } break; case 4: n = v->n; q = v->a; while(n--){ l = Bgetc(bp); l |= Bgetc(bp) << 8; l |= Bgetc(bp) << 16; *q++ = l | Bgetc(bp) << 24; } break; } } void putvars(Var *v) { int n; u16int *p; u32int *q; for(; v->a != nil; v++) switch(v->s){ case 1: Bwrite(bp, v->a, v->n); break; case 2: n = v->n; p = v->a; while(n--){ Bputc(bp, *p & 0xff); Bputc(bp, *p++ >> 8); } break; case 4: n = v->n; q = v->a; while(n--){ Bputc(bp, *q); Bputc(bp, *q >> 8); Bputc(bp, *q >> 16); Bputc(bp, *q++ >> 24); } break; } } void savestate(char *file) { flushback(); bp = Bopen(file, OWRITE); if(bp == nil){ print("open: %r\n"); return; } putvars(cpuvars); putvars(ppuvars); putvars(memvars); putvars(apuvars); putvars(evvars); putevents(); mapper(SAVE, 0); Bterm(bp); } void loadstate(char *file) { bp = Bopen(file, OREAD); if(bp == nil){ print("open: %r\n"); return; } getvars(cpuvars); getvars(ppuvars); getvars(memvars); getvars(apuvars); getvars(evvars); getevents(); mapper(RSTR, 0); memload(); Bterm(bp); }