ref: 1b619dea42e60be0316f03a358c52c2e86a6d654
dir: /sys/src/games/nes/state.c/
#include <u.h> #include <libc.h> #include <thread.h> #include <draw.h> #include "dat.h" #include "fns.h" static int fd; void put8(u8int i) { write(fd, &i, 1); } void put16(u16int i) { put8(i); put8(i >> 8); } void put32(u32int i) { put8(i); put8(i >> 8); put8(i >> 16); put8(i >> 24); } int get8(void) { u8int c; read(fd, &c, 1); return c; } int get16(void) { int i; i = get8(); i |= get8() << 8; return i; } int get32(void) { int i; i = get8(); i |= get8() << 8; i |= get8() << 16; i |= get8() << 24; return i; } void loadstate(char *file) { fd = open(file, OREAD); if(fd < 0){ message("open: %r"); return; } read(fd, mem, sizeof(mem)); read(fd, ppuram, sizeof(ppuram)); read(fd, oam, sizeof(oam)); if(chrram) read(fd, chr, nchr * CHRSZ); rA = get8(); rX = get8(); rY = get8(); rS = get8(); rP = get8(); nmi = get8(); pc = get16(); pput = get16(); ppuv = get16(); ppusx = get8(); ppux = get16(); ppuy = get16(); mirr = get8(); odd = get8(); vramlatch = get8(); keylatch = get8(); keylatch2 = get8(); vrambuf = get8(); clock = get32(); ppuclock = get32(); apuclock = get32(); apuseq = get8(); dmcaddr = get16(); dmccnt = get16(); read(fd, apuctr, sizeof(apuctr)); mapper[map](RSTR, 0); close(fd); } void savestate(char *file) { fd = create(file, ORDWR, 0666); if(fd < 0){ message("create: %r"); return; } write(fd, mem, sizeof(mem)); write(fd, ppuram, sizeof(ppuram)); write(fd, oam, sizeof(oam)); if(chrram) write(fd, chr, nchr * CHRSZ); put8(rA); put8(rX); put8(rY); put8(rS); put8(rP); put8(nmi); put16(pc); put16(pput); put16(ppuv); put8(ppusx); put16(ppux); put16(ppuy); put8(mirr); put8(odd); put8(vramlatch); put8(keylatch); put8(keylatch2); put8(vrambuf); put32(clock); put32(ppuclock); put32(apuclock); put8(apuseq); put16(dmcaddr); put16(dmccnt); write(fd, apuctr, sizeof(apuctr)); mapper[map](SAVE, 0); close(fd); }