int state_load(unsigned char *buffer)
{
/* buffer size */
int bufferptr = 0;
/* first allocate state buffer */
unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
if (!state) return 0;
/* uncompress savestate */
unsigned long inbytes, outbytes;
memcpy(&inbytes, buffer, 4);
outbytes = STATE_SIZE;
uncompress ((Bytef *)state, &outbytes, (Bytef *)(buffer + 4), inbytes);
/* signature check (GENPLUS-GX x.x.x) */
char version[17];
load_param(version,16);
version[16] = 0;
if (strncmp(version,STATE_VERSION,11))
{
free(state);
return -1;
}
/* version check (1.5.0 and above) */
if ((version[11] < 0x31) || ((version[11] == 0x31) && (version[13] < 0x35)))
{
free(state);
return -1;
}
/* reset system */
system_reset();
// GENESIS
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
load_param(work_ram, sizeof(work_ram));
load_param(zram, sizeof(zram));
load_param(&zstate, sizeof(zstate));
load_param(&zbank, sizeof(zbank));
if (zstate == 3)
{
m68k_memory_map[0xa0].read8 = z80_read_byte;
m68k_memory_map[0xa0].read16 = z80_read_word;
m68k_memory_map[0xa0].write8 = z80_write_byte;
m68k_memory_map[0xa0].write16 = z80_write_word;
}
else
{
m68k_memory_map[0xa0].read8 = m68k_read_bus_8;
m68k_memory_map[0xa0].read16 = m68k_read_bus_16;
m68k_memory_map[0xa0].write8 = m68k_unused_8_w;
m68k_memory_map[0xa0].write16 = m68k_unused_16_w;
}
}
else
{
load_param(work_ram, 0x2000);
}
/* extended state */
load_param(&mcycles_68k, sizeof(mcycles_68k));
load_param(&mcycles_z80, sizeof(mcycles_z80));
// IO
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
load_param(io_reg, sizeof(io_reg));
io_reg[0] = region_code | 0x20 | (config.tmss & 1);
}
else
{
load_param(&io_reg[0x0F], 1);
}
// VDP
bufferptr += vdp_context_load(&state[bufferptr], version);
// SOUND
bufferptr += sound_context_load(&state[bufferptr], version);
// 68000
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
uint16 tmp16;
uint32 tmp32;
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
}
// Z80
load_param(&Z80, sizeof(Z80_Regs));
Z80.irq_callback = z80_irq_callback;
// Cartridge HW
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
bufferptr += md_cart_context_load(&state[bufferptr]);
}
else
{
bufferptr += sms_cart_context_load(&state[bufferptr]);
}
free(state);
return 1;
}
int state_load_old(unsigned char *state)
{
int i, bufferptr = 0x10;
/* reset system */
system_reset();
// GENESIS
if (system_hw == SYSTEM_PBC || system_hw == SYSTEM_GAMEGEAR) {
load_param(work_ram, 0x2000);
} else {
load_param(work_ram, sizeof(work_ram));
load_param(zram, sizeof(zram));
load_param(&zstate, sizeof(zstate));
load_param(&zbank, sizeof(zbank));
if (zstate == 3) {
m68k_memory_map[0xa0].read8 = z80_read_byte;
m68k_memory_map[0xa0].read16 = z80_read_word;
m68k_memory_map[0xa0].write8 = z80_write_byte;
m68k_memory_map[0xa0].write16 = z80_write_word;
} else {
m68k_memory_map[0xa0].read8 = m68k_read_bus_8;
m68k_memory_map[0xa0].read16 = m68k_read_bus_16;
m68k_memory_map[0xa0].write8 = m68k_unused_8_w;
m68k_memory_map[0xa0].write16 = m68k_unused_16_w;
}
}
// IO
if (system_hw == SYSTEM_PBC || system_hw == SYSTEM_GAMEGEAR) {
load_param(&io_reg[0xf], 1);
bufferptr+=0x10-1;
} else {
load_param(io_reg, sizeof(io_reg));
io_reg[0] = region_code | 0x20 | (config.tmss & 1);
}
/* VDP */
bufferptr += vdp_context_load_old(&state[bufferptr]);
/* SOUND */
bufferptr += sound_context_load(&state[bufferptr]);
/* 68000 */
if (system_hw != SYSTEM_PBC && system_hw != SYSTEM_GAMEGEAR)
{
uint16 tmp16;
uint32 tmp32;
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_ISP,tmp32);
load_param(&mcycles_68k, sizeof(mcycles_68k));
load_param(&tmp32, 4);
m68k_irq_state = tmp32 >> 8;
bufferptr += 4; // skip m68k.stopped
}