drc: dumb detection of writes to current block

[picodrive.git] / pico / state.c

/*\r
 * PicoDrive\r
 * (C) notaz, 2010\r
 *\r
 * This work is licensed under the terms of MAME license.\r
 * See COPYING file in the top-level directory.\r
 */\r
\r
#include "pico_int.h"\r
#include <zlib/zlib.h>\r
\r
#include "../cpu/sh2/sh2.h"\r
#include "sound/ym2612.h"\r
\r
// sn76496\r
extern int *sn76496_regs;\r
\r
typedef size_t (arearw)(void *p, size_t _size, size_t _n, void *file);\r
typedef size_t (areaeof)(void *file);\r
typedef int    (areaseek)(void *file, long offset, int whence);\r
typedef int    (areaclose)(void *file);\r
\r
static arearw    *areaRead;\r
static arearw    *areaWrite;\r
static areaeof   *areaEof;\r
static areaseek  *areaSeek;\r
static areaclose *areaClose;\r
\r
carthw_state_chunk *carthw_chunks;\r
void (*PicoStateProgressCB)(const char *str);\r
void (*PicoLoadStateHook)(void);\r
\r
\r
/* I/O functions */\r
static size_t gzRead2(void *p, size_t _size, size_t _n, void *file)\r
{\r
  return gzread(file, p, _size * _n);\r
}\r
\r
static size_t gzWrite2(void *p, size_t _size, size_t _n, void *file)\r
{\r
  return gzwrite(file, p, _size * _n);\r
}\r
\r
static void set_cbs(int gz)\r
{\r
  if (gz) {\r
    areaRead  = gzRead2;\r
    areaWrite = gzWrite2;\r
    areaEof   = (areaeof *) gzeof;\r
    areaSeek  = (areaseek *) gzseek;\r
    areaClose = (areaclose *) gzclose;\r
  } else {\r
    areaRead  = (arearw *) fread;\r
    areaWrite = (arearw *) fwrite;\r
    areaEof   = (areaeof *) feof;\r
    areaSeek  = (areaseek *) fseek;\r
    areaClose = (areaclose *) fclose;\r
  }\r
}\r
\r
static void *open_save_file(const char *fname, int is_save)\r
{\r
  int len = strlen(fname);\r
  void *afile = NULL;\r
\r
  if (len > 3 && strcmp(fname + len - 3, ".gz") == 0)\r
  {\r
    if ( (afile = gzopen(fname, is_save ? "wb" : "rb")) ) {\r
      set_cbs(1);\r
      if (is_save)\r
        gzsetparams(afile, 9, Z_DEFAULT_STRATEGY);\r
    }\r
  }\r
  else\r
  {\r
    if ( (afile = fopen(fname, is_save ? "wb" : "rb")) ) {\r
      set_cbs(0);\r
    }\r
  }\r
\r
  return afile;\r
}\r
\r
// legacy savestate loading\r
#define SCANP(f, x) areaRead(&Pico.x, sizeof(Pico.x), 1, f)\r
\r
static int state_load_legacy(void *file)\r
{\r
  unsigned char head[32];\r
  unsigned char cpu[0x60];\r
  unsigned char cpu_z80[Z80_STATE_SIZE];\r
  void *ym2612_regs;\r
  int ok;\r
\r
  memset(&cpu,0,sizeof(cpu));\r
  memset(&cpu_z80,0,sizeof(cpu_z80));\r
\r
  memset(head, 0, sizeof(head));\r
  areaRead(head, sizeof(head), 1, file);\r
  if (strcmp((char *)head, "Pico") != 0)\r
    return -1;\r
\r
  elprintf(EL_STATUS, "legacy savestate");\r
\r
  // Scan all the memory areas:\r
  SCANP(file, ram);\r
  SCANP(file, vram);\r
  SCANP(file, zram);\r
  SCANP(file, cram);\r
  SCANP(file, vsram);\r
\r
  // Pack, scan and unpack the cpu data:\r
  areaRead(cpu, sizeof(cpu), 1, file);\r
  SekUnpackCpu(cpu, 0);\r
\r
  SCANP(file, m);\r
  SCANP(file, video);\r
\r
  ok = areaRead(cpu_z80, sizeof(cpu_z80), 1, file) == sizeof(cpu_z80);\r
  // do not unpack if we fail to load z80 state\r
  if (!ok) z80_reset();\r
  else     z80_unpack(cpu_z80);\r
\r
  ym2612_regs = YM2612GetRegs();\r
  areaRead(sn76496_regs, 28*4, 1, file);\r
  areaRead(ym2612_regs, 0x200+4, 1, file);\r
  ym2612_unpack_state();\r
\r
  return 0;\r
}\r
\r
// ---------------------------------------------------------------------------\r
\r
typedef enum {\r
  CHUNK_M68K = 1,\r
  CHUNK_RAM,\r
  CHUNK_VRAM,\r
  CHUNK_ZRAM,\r
  CHUNK_CRAM,    // 5\r
  CHUNK_VSRAM,\r
  CHUNK_MISC,\r
  CHUNK_VIDEO,\r
  CHUNK_Z80,\r
  CHUNK_PSG,     // 10\r
  CHUNK_FM,\r
  // CD stuff\r
  CHUNK_S68K,\r
  CHUNK_PRG_RAM,\r
  CHUNK_WORD_RAM,\r
  CHUNK_PCM_RAM, // 15\r
  CHUNK_BRAM,\r
  CHUNK_GA_REGS,\r
  CHUNK_PCM,\r
  CHUNK_CDC,\r
  CHUNK_CDD,     // 20\r
  CHUNK_SCD,\r
  CHUNK_RC,\r
  CHUNK_MISC_CD,\r
  //\r
  CHUNK_IOPORTS, // versions < 1.70 did not save that..\r
  CHUNK_SMS,     // 25\r
  // 32x\r
  CHUNK_MSH2,\r
  CHUNK_MSH2_DATA,\r
  CHUNK_MSH2_PERI,\r
  CHUNK_SSH2,\r
  CHUNK_SSH2_DATA, // 30\r
  CHUNK_SSH2_PERI,\r
  CHUNK_32XSYS,\r
  CHUNK_M68K_BIOS,\r
  CHUNK_MSH2_BIOS,\r
  CHUNK_SSH2_BIOS, // 35\r
  CHUNK_SDRAM,\r
  CHUNK_DRAM,\r
  CHUNK_32XPAL,\r
  CHUNK_32X_EVT,\r
  CHUNK_32X_FIRST = CHUNK_MSH2,\r
  CHUNK_32X_LAST = CHUNK_32X_EVT,\r
  //\r
  CHUNK_DEFAULT_COUNT,\r
  CHUNK_CARTHW_ = CHUNK_CARTHW,  // defined in PicoInt\r
} chunk_name_e;\r
\r
static const char * const chunk_names[] = {\r
  "INVALID!",\r
  "M68K state",\r
  "RAM",\r
  "VRAM",\r
  "ZRAM",\r
  "CRAM",      // 5\r
  "VSRAM",\r
  "emu state",\r
  "VIDEO",\r
  "Z80 state",\r
  "PSG",       // 10\r
  "FM",\r
  // CD stuff\r
  "S68K state",\r
  "PRG_RAM",\r
  "WORD_RAM",\r
  "PCM_RAM",   // 15\r
  "BRAM",\r
  "GATE ARRAY regs",\r
  "PCM state",\r
  "CDC",\r
  "CDD",       // 20\r
  "SCD",\r
  "GFX chip",\r
  "MCD state",\r
  //\r
  "IO",\r
  "SMS state", // 25\r
  // 32x\r
  "MSH2",\r
  "MSH2 data",\r
  "MSH2 peri",\r
  "SSH2",\r
  "SSH2 data", // 30\r
  "SSH2 peri",\r
  "32X system regs",\r
  "M68K BIOS",\r
  "MSH2 BIOS",\r
  "SSH2 BIOS", // 35\r
  "SDRAM",\r
  "DRAM",\r
  "PAL",\r
  "events",\r
};\r
\r
static int write_chunk(chunk_name_e name, int len, void *data, void *file)\r
{\r
  size_t bwritten = 0;\r
  bwritten += areaWrite(&name, 1, 1, file);\r
  bwritten += areaWrite(&len, 1, 4, file);\r
  bwritten += areaWrite(data, 1, len, file);\r
\r
  return (bwritten == len + 4 + 1);\r
}\r
\r
#define CHECKED_WRITE(name,len,data) { \\r
  if (PicoStateProgressCB && name < CHUNK_DEFAULT_COUNT) { \\r
    strncpy(sbuff + 9, chunk_names[name], sizeof(sbuff) - 9); \\r
    PicoStateProgressCB(sbuff); \\r
  } \\r
  if (!write_chunk(name, len, data, file)) return 1; \\r
}\r
\r
#define CHECKED_WRITE_BUFF(name,buff) { \\r
  if (PicoStateProgressCB && name < CHUNK_DEFAULT_COUNT) { \\r
    strncpy(sbuff + 9, chunk_names[name], sizeof(sbuff) - 9); \\r
    PicoStateProgressCB(sbuff); \\r
  } \\r
  if (!write_chunk(name, sizeof(buff), &buff, file)) return 1; \\r
}\r
\r
static int state_save(void *file)\r
{\r
  char sbuff[32] = "Saving.. ";\r
  unsigned char buff[0x60], buff_z80[Z80_STATE_SIZE];\r
  void *ym2612_regs = YM2612GetRegs();\r
  int ver = 0x0170; // not really used..\r
\r
  areaWrite("PicoSEXT", 1, 8, file);\r
  areaWrite(&ver, 1, 4, file);\r
\r
  if (!(PicoAHW & PAHW_SMS)) {\r
    memset(buff, 0, sizeof(buff));\r
    SekPackCpu(buff, 0);\r
    CHECKED_WRITE_BUFF(CHUNK_M68K,  buff);\r
    CHECKED_WRITE_BUFF(CHUNK_RAM,   Pico.ram);\r
    CHECKED_WRITE_BUFF(CHUNK_VSRAM, Pico.vsram);\r
    CHECKED_WRITE_BUFF(CHUNK_IOPORTS, Pico.ioports);\r
    ym2612_pack_state();\r
    CHECKED_WRITE(CHUNK_FM, 0x200+4, ym2612_regs);\r
  }\r
  else {\r
    CHECKED_WRITE_BUFF(CHUNK_SMS, Pico.ms);\r
  }\r
\r
  CHECKED_WRITE_BUFF(CHUNK_VRAM,  Pico.vram);\r
  CHECKED_WRITE_BUFF(CHUNK_ZRAM,  Pico.zram);\r
  CHECKED_WRITE_BUFF(CHUNK_CRAM,  Pico.cram);\r
  CHECKED_WRITE_BUFF(CHUNK_MISC,  Pico.m);\r
  CHECKED_WRITE_BUFF(CHUNK_VIDEO, Pico.video);\r
\r
  z80_pack(buff_z80);\r
  CHECKED_WRITE_BUFF(CHUNK_Z80, buff_z80);\r
  CHECKED_WRITE(CHUNK_PSG, 28*4, sn76496_regs);\r
\r
  if (PicoAHW & PAHW_MCD)\r
  {\r
    memset(buff, 0, sizeof(buff));\r
    SekPackCpu(buff, 1);\r
    if (Pico_mcd->s68k_regs[3] & 4) // 1M mode?\r
      wram_1M_to_2M(Pico_mcd->word_ram2M);\r
    Pico_mcd->m.hint_vector = *(unsigned short *)(Pico_mcd->bios + 0x72);\r
\r
    CHECKED_WRITE_BUFF(CHUNK_S68K,     buff);\r
    CHECKED_WRITE_BUFF(CHUNK_PRG_RAM,  Pico_mcd->prg_ram);\r
    CHECKED_WRITE_BUFF(CHUNK_WORD_RAM, Pico_mcd->word_ram2M); // in 2M format\r
    CHECKED_WRITE_BUFF(CHUNK_PCM_RAM,  Pico_mcd->pcm_ram);\r
    CHECKED_WRITE_BUFF(CHUNK_BRAM,     Pico_mcd->bram);\r
    CHECKED_WRITE_BUFF(CHUNK_GA_REGS,  Pico_mcd->s68k_regs); // GA regs, not CPU regs\r
    CHECKED_WRITE_BUFF(CHUNK_PCM,      Pico_mcd->pcm);\r
    CHECKED_WRITE_BUFF(CHUNK_CDD,      Pico_mcd->cdd);\r
    CHECKED_WRITE_BUFF(CHUNK_CDC,      Pico_mcd->cdc);\r
    CHECKED_WRITE_BUFF(CHUNK_SCD,      Pico_mcd->scd);\r
    CHECKED_WRITE_BUFF(CHUNK_RC,       Pico_mcd->rot_comp);\r
    CHECKED_WRITE_BUFF(CHUNK_MISC_CD,  Pico_mcd->m);\r
\r
    if (Pico_mcd->s68k_regs[3] & 4) // convert back\r
      wram_2M_to_1M(Pico_mcd->word_ram2M);\r
  }\r
\r
#ifndef NO_32X\r
  if (PicoAHW & PAHW_32X)\r
  {\r
    unsigned char cpubuff[SH2_STATE_SIZE];\r
\r
    memset(cpubuff, 0, sizeof(cpubuff));\r
\r
    sh2_pack(&sh2s[0], cpubuff);\r
    CHECKED_WRITE_BUFF(CHUNK_MSH2,      cpubuff);\r
    CHECKED_WRITE_BUFF(CHUNK_MSH2_DATA, Pico32xMem->data_array[0]);\r
    CHECKED_WRITE_BUFF(CHUNK_MSH2_PERI, Pico32xMem->sh2_peri_regs[0]);\r
\r
    sh2_pack(&sh2s[1], cpubuff);\r
    CHECKED_WRITE_BUFF(CHUNK_SSH2,      cpubuff);\r
    CHECKED_WRITE_BUFF(CHUNK_SSH2_DATA, Pico32xMem->data_array[1]);\r
    CHECKED_WRITE_BUFF(CHUNK_SSH2_PERI, Pico32xMem->sh2_peri_regs[1]);\r
\r
    CHECKED_WRITE_BUFF(CHUNK_32XSYS,    Pico32x);\r
    CHECKED_WRITE_BUFF(CHUNK_M68K_BIOS, Pico32xMem->m68k_rom);\r
    CHECKED_WRITE_BUFF(CHUNK_MSH2_BIOS, Pico32xMem->sh2_rom_m);\r
    CHECKED_WRITE_BUFF(CHUNK_SSH2_BIOS, Pico32xMem->sh2_rom_s);\r
    CHECKED_WRITE_BUFF(CHUNK_SDRAM,     Pico32xMem->sdram);\r
    CHECKED_WRITE_BUFF(CHUNK_DRAM,      Pico32xMem->dram);\r
    CHECKED_WRITE_BUFF(CHUNK_32XPAL,    Pico32xMem->pal);\r
\r
    memset(buff, 0, 0x40);\r
    memcpy(buff, event_times, sizeof(event_times));\r
    CHECKED_WRITE(CHUNK_32X_EVT, 0x40, buff);\r
  }\r
#endif\r
\r
  if (carthw_chunks != NULL)\r
  {\r
    carthw_state_chunk *chwc;\r
    if (PicoStateProgressCB)\r
      PicoStateProgressCB("Saving.. cart hw state");\r
    for (chwc = carthw_chunks; chwc->ptr != NULL; chwc++)\r
      CHECKED_WRITE(chwc->chunk, chwc->size, chwc->ptr);\r
  }\r
\r
  return 0;\r
}\r
\r
static int g_read_offs = 0;\r
\r
#define R_ERROR_RETURN(error) \\r
{ \\r
  elprintf(EL_STATUS, "load_state @ %x: " error, g_read_offs); \\r
  return 1; \\r
}\r
\r
// when is eof really set?\r
#define CHECKED_READ(len,data) { \\r
  if (areaRead(data, 1, len, file) != len) { \\r
    if (len == 1 && areaEof(file)) goto readend; \\r
    R_ERROR_RETURN("areaRead: premature EOF\n"); \\r
    return 1; \\r
  } \\r
  g_read_offs += len; \\r
}\r
\r
#define CHECKED_READ2(len2,data) { \\r
  if (len2 != len) { \\r
    elprintf(EL_STATUS, "unexpected len %i, wanted %i (%s)", len, len2, #len2); \\r
    if (len > len2) R_ERROR_RETURN("failed."); \\r
    /* else read anyway and hope for the best.. */ \\r
  } \\r
  CHECKED_READ(len, data); \\r
}\r
\r
#define CHECKED_READ_BUFF(buff) CHECKED_READ2(sizeof(buff), &buff);\r
\r
static int state_load(void *file)\r
{\r
  unsigned char buff_m68k[0x60], buff_s68k[0x60];\r
  unsigned char buff_z80[Z80_STATE_SIZE];\r
  unsigned char buff_sh2[SH2_STATE_SIZE];\r
  unsigned char buff[0x40];\r
  unsigned char chunk;\r
  void *ym2612_regs;\r
  char header[8];\r
  int ver, len;\r
\r
  memset(buff_m68k, 0, sizeof(buff_m68k));\r
  memset(buff_s68k, 0, sizeof(buff_s68k));\r
  memset(buff_z80, 0, sizeof(buff_z80));\r
\r
  g_read_offs = 0;\r
  CHECKED_READ(8, header);\r
  if (strncmp(header, "PicoSMCD", 8) && strncmp(header, "PicoSEXT", 8))\r
    R_ERROR_RETURN("bad header");\r
  CHECKED_READ(4, &ver);\r
\r
  while (!areaEof(file))\r
  {\r
    CHECKED_READ(1, &chunk);\r
    CHECKED_READ(4, &len);\r
    if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");\r
    if (CHUNK_S68K <= chunk && chunk <= CHUNK_MISC_CD && !(PicoAHW & PAHW_MCD))\r
      R_ERROR_RETURN("cd chunk in non CD state?");\r
    if (CHUNK_32X_FIRST <= chunk && chunk <= CHUNK_32X_LAST && !(PicoAHW & PAHW_32X))\r
      Pico32xStartup();\r
\r
    switch (chunk)\r
    {\r
      case CHUNK_M68K:\r
        CHECKED_READ_BUFF(buff_m68k);\r
        break;\r
\r
      case CHUNK_Z80:\r
        CHECKED_READ_BUFF(buff_z80);\r
        break;\r
\r
      case CHUNK_RAM:     CHECKED_READ_BUFF(Pico.ram); break;\r
      case CHUNK_VRAM:    CHECKED_READ_BUFF(Pico.vram); break;\r
      case CHUNK_ZRAM:    CHECKED_READ_BUFF(Pico.zram); break;\r
      case CHUNK_CRAM:    CHECKED_READ_BUFF(Pico.cram); break;\r
      case CHUNK_VSRAM:   CHECKED_READ_BUFF(Pico.vsram); break;\r
      case CHUNK_MISC:    CHECKED_READ_BUFF(Pico.m); break;\r
      case CHUNK_VIDEO:   CHECKED_READ_BUFF(Pico.video); break;\r
      case CHUNK_IOPORTS: CHECKED_READ_BUFF(Pico.ioports); break;\r
      case CHUNK_PSG:     CHECKED_READ2(28*4, sn76496_regs); break;\r
      case CHUNK_FM:\r
        ym2612_regs = YM2612GetRegs();\r
        CHECKED_READ2(0x200+4, ym2612_regs);\r
        ym2612_unpack_state();\r
        break;\r
\r
      case CHUNK_SMS:\r
        CHECKED_READ_BUFF(Pico.ms);\r
        break;\r
\r
      // cd stuff\r
      case CHUNK_S68K:\r
        CHECKED_READ_BUFF(buff_s68k);\r
        break;\r
\r
      case CHUNK_PRG_RAM:  CHECKED_READ_BUFF(Pico_mcd->prg_ram); break;\r
      case CHUNK_WORD_RAM: CHECKED_READ_BUFF(Pico_mcd->word_ram2M); break;\r
      case CHUNK_PCM_RAM:  CHECKED_READ_BUFF(Pico_mcd->pcm_ram); break;\r
      case CHUNK_BRAM:     CHECKED_READ_BUFF(Pico_mcd->bram); break;\r
      case CHUNK_GA_REGS:  CHECKED_READ_BUFF(Pico_mcd->s68k_regs); break;\r
      case CHUNK_PCM:      CHECKED_READ_BUFF(Pico_mcd->pcm); break;\r
      case CHUNK_CDD:      CHECKED_READ_BUFF(Pico_mcd->cdd); break;\r
      case CHUNK_CDC:      CHECKED_READ_BUFF(Pico_mcd->cdc); break;\r
      case CHUNK_SCD:      CHECKED_READ_BUFF(Pico_mcd->scd); break;\r
      case CHUNK_RC:       CHECKED_READ_BUFF(Pico_mcd->rot_comp); break;\r
      case CHUNK_MISC_CD:  CHECKED_READ_BUFF(Pico_mcd->m); break;\r
\r
      // 32x stuff\r
#ifndef NO_32X\r
      case CHUNK_MSH2:\r
        CHECKED_READ_BUFF(buff_sh2);\r
        sh2_unpack(&sh2s[0], buff_sh2);\r
        break;\r
\r
      case CHUNK_SSH2:\r
        CHECKED_READ_BUFF(buff_sh2);\r
        sh2_unpack(&sh2s[1], buff_sh2);\r
        break;\r
\r
      case CHUNK_MSH2_DATA:   CHECKED_READ_BUFF(Pico32xMem->data_array[0]); break;\r
      case CHUNK_MSH2_PERI:   CHECKED_READ_BUFF(Pico32xMem->sh2_peri_regs[0]); break;\r
      case CHUNK_SSH2_DATA:   CHECKED_READ_BUFF(Pico32xMem->data_array[1]); break;\r
      case CHUNK_SSH2_PERI:   CHECKED_READ_BUFF(Pico32xMem->sh2_peri_regs[1]); break;\r
      case CHUNK_32XSYS:      CHECKED_READ_BUFF(Pico32x); break;\r
      case CHUNK_M68K_BIOS:   CHECKED_READ_BUFF(Pico32xMem->m68k_rom); break;\r
      case CHUNK_MSH2_BIOS:   CHECKED_READ_BUFF(Pico32xMem->sh2_rom_m); break;\r
      case CHUNK_SSH2_BIOS:   CHECKED_READ_BUFF(Pico32xMem->sh2_rom_s); break;\r
      case CHUNK_SDRAM:       CHECKED_READ_BUFF(Pico32xMem->sdram); break;\r
      case CHUNK_DRAM:        CHECKED_READ_BUFF(Pico32xMem->dram); break;\r
      case CHUNK_32XPAL:      CHECKED_READ_BUFF(Pico32xMem->pal); break;\r
\r
      case CHUNK_32X_EVT:\r
        CHECKED_READ_BUFF(buff);\r
        memcpy(event_times, buff, sizeof(event_times));\r
        break;\r
#endif\r
      default:\r
        if (carthw_chunks != NULL)\r
        {\r
          carthw_state_chunk *chwc;\r
          for (chwc = carthw_chunks; chwc->ptr != NULL; chwc++) {\r
            if (chwc->chunk == chunk) {\r
              CHECKED_READ2(chwc->size, chwc->ptr);\r
              goto breakswitch;\r
            }\r
          }\r
        }\r
        elprintf(EL_STATUS, "load_state: skipping unknown chunk %i of size %i", chunk, len);\r
        areaSeek(file, len, SEEK_CUR);\r
        break;\r
    }\r
breakswitch:;\r
  }\r
\r
readend:\r
  if (PicoAHW & PAHW_SMS)\r
    PicoStateLoadedMS();\r
\r
  if (PicoAHW & PAHW_MCD)\r
  {\r
    PicoMemStateLoaded();\r
\r
    if (!(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
      cdda_start_play();\r
  }\r
\r
  if (PicoAHW & PAHW_32X)\r
    Pico32xStateLoaded(1);\r
\r
  // must unpack 68k and z80 after banks are set up\r
  if (!(PicoAHW & PAHW_SMS))\r
    SekUnpackCpu(buff_m68k, 0);\r
  if (PicoAHW & PAHW_MCD)\r
    SekUnpackCpu(buff_s68k, 1);\r
\r
  z80_unpack(buff_z80);\r
\r
  // due to dep from 68k cycles..\r
  if (PicoAHW & PAHW_32X)\r
    Pico32xStateLoaded(0);\r
\r
  return 0;\r
}\r
\r
static int state_load_gfx(void *file)\r
{\r
  int ver, len, found = 0, to_find = 4;\r
  char buff[8];\r
\r
  if (PicoAHW & PAHW_32X)\r
    to_find += 2;\r
\r
  g_read_offs = 0;\r
  CHECKED_READ(8, buff);\r
  if (strncmp((char *)buff, "PicoSMCD", 8) && strncmp((char *)buff, "PicoSEXT", 8))\r
    R_ERROR_RETURN("bad header");\r
  CHECKED_READ(4, &ver);\r
\r
  while (!areaEof(file) && found < to_find)\r
  {\r
    CHECKED_READ(1, buff);\r
    CHECKED_READ(4, &len);\r
    if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");\r
    if (buff[0] > CHUNK_FM && buff[0] <= CHUNK_MISC_CD && !(PicoAHW & PAHW_MCD))\r
      R_ERROR_RETURN("cd chunk in non CD state?");\r
\r
    switch (buff[0])\r
    {\r
      case CHUNK_VRAM:  CHECKED_READ_BUFF(Pico.vram);  found++; break;\r
      case CHUNK_CRAM:  CHECKED_READ_BUFF(Pico.cram);  found++; break;\r
      case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); found++; break;\r
      case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); found++; break;\r
\r
#ifndef NO_32X\r
      case CHUNK_DRAM:\r
        if (Pico32xMem != NULL)\r
          CHECKED_READ_BUFF(Pico32xMem->dram);\r
        break;\r
\r
      case CHUNK_32XPAL:\r
        if (Pico32xMem != NULL)\r
          CHECKED_READ_BUFF(Pico32xMem->pal);\r
        Pico32x.dirty_pal = 1;\r
        break;\r
\r
      case CHUNK_32XSYS:\r
        CHECKED_READ_BUFF(Pico32x);\r
        break;\r
#endif\r
      default:\r
        areaSeek(file, len, SEEK_CUR);\r
        break;\r
    }\r
  }\r
\r
readend:\r
  return 0;\r
}\r
\r
int PicoState(const char *fname, int is_save)\r
{\r
  void *afile = NULL;\r
  int ret;\r
\r
  afile = open_save_file(fname, is_save);\r
  if (afile == NULL)\r
    return -1;\r
\r
  if (is_save)\r
    ret = state_save(afile);\r
  else {\r
    ret = state_load(afile);\r
    if (ret != 0) {\r
      areaSeek(afile, 0, SEEK_SET);\r
      ret = state_load_legacy(afile);\r
    }\r
\r
    if (PicoLoadStateHook != NULL)\r
      PicoLoadStateHook();\r
    Pico.m.dirtyPal = 1;\r
  }\r
\r
  areaClose(afile);\r
  return ret;\r
}\r
\r
int PicoStateLoadGfx(const char *fname)\r
{\r
  void *afile;\r
  int ret;\r
\r
  afile = open_save_file(fname, 0);\r
  if (afile == NULL)\r
    return -1;\r
\r
  ret = state_load_gfx(afile);\r
  if (ret != 0) {\r
    // assume legacy\r
    areaSeek(afile, 0x10020, SEEK_SET);  // skip header and RAM\r
    areaRead(Pico.vram, 1, sizeof(Pico.vram), afile);\r
    areaSeek(afile, 0x2000, SEEK_CUR);\r
    areaRead(Pico.cram, 1, sizeof(Pico.cram), afile);\r
    areaRead(Pico.vsram, 1, sizeof(Pico.vsram), afile);\r
    areaSeek(afile, 0x221a0, SEEK_SET);\r
    areaRead(&Pico.video, 1, sizeof(Pico.video), afile);\r
  }\r
  areaClose(afile);\r
  return 0;\r
}\r
\r
// tmp state\r
struct PicoTmp\r
{\r
  unsigned short vram[0x8000];\r
  unsigned short cram[0x40];\r
  unsigned short vsram[0x40];\r
\r
  //struct PicoMisc m;\r
  struct PicoVideo video;\r
\r
  struct {\r
    struct Pico32x p32x;\r
    unsigned short dram[2][0x20000/2];\r
    unsigned short pal[0x100];\r
  } t32x;\r
};\r
\r
// returns data ptr to free() or PicoTmpStateRestore()\r
void *PicoTmpStateSave(void)\r
{\r
  // gfx only for now\r
  struct PicoTmp *t = malloc(sizeof(*t));\r
  if (t == NULL)\r
    return NULL;\r
\r
  memcpy(t->vram, Pico.vram, sizeof(Pico.vram));\r
  memcpy(t->cram, Pico.cram, sizeof(Pico.cram));\r
  memcpy(t->vsram, Pico.vsram, sizeof(Pico.vsram));\r
  memcpy(&t->video, &Pico.video, sizeof(Pico.video));\r
\r
#ifndef NO_32X\r
  if (PicoAHW & PAHW_32X) {\r
    memcpy(&t->t32x.p32x, &Pico32x, sizeof(Pico32x));\r
    memcpy(t->t32x.dram, Pico32xMem->dram, sizeof(Pico32xMem->dram));\r
    memcpy(t->t32x.pal, Pico32xMem->pal, sizeof(Pico32xMem->pal));\r
  }\r
#endif\r
\r
  return t;\r
}\r
\r
void PicoTmpStateRestore(void *data)\r
{\r
  struct PicoTmp *t = data;\r
  if (t == NULL)\r
    return;\r
\r
  memcpy(Pico.vram, t->vram, sizeof(Pico.vram));\r
  memcpy(Pico.cram, t->cram, sizeof(Pico.cram));\r
  memcpy(Pico.vsram, t->vsram, sizeof(Pico.vsram));\r
  memcpy(&Pico.video, &t->video, sizeof(Pico.video));\r
  Pico.m.dirtyPal = 1;\r
\r
#ifndef NO_32X\r
  if (PicoAHW & PAHW_32X) {\r
    memcpy(&Pico32x, &t->t32x.p32x, sizeof(Pico32x));\r
    memcpy(Pico32xMem->dram, t->t32x.dram, sizeof(Pico32xMem->dram));\r
    memcpy(Pico32xMem->pal, t->t32x.pal, sizeof(Pico32xMem->pal));\r
    Pico32x.dirty_pal = 1;\r
  }\r
#endif\r
}\r
\r
// vim:shiftwidth=2:ts=2:expandtab\r