mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
// This is part of Pico Library
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// (c) Copyright 2006 notaz, All rights reserved.
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include "../PicoInt.h"
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// ym2612
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#include "../sound/ym2612.h"
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// sn76496
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extern int *sn76496_regs;
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typedef enum {
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CHUNK_M68K = 1,
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CHUNK_RAM,
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CHUNK_VRAM,
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CHUNK_ZRAM,
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CHUNK_CRAM,
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CHUNK_VSRAM,
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CHUNK_MISC,
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CHUNK_VIDEO,
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CHUNK_Z80,
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CHUNK_PSG,
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CHUNK_FM,
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// CD stuff
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} chunk_name_e;
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static int write_chunk(chunk_name_e name, int len, void *data, void *file)
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{
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size_t bwritten = 0;
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bwritten += areaWrite(&name, 1, 1, file);
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bwritten += areaWrite(&len, 1, 4, file);
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bwritten += areaWrite(data, 1, len, file);
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return (bwritten == len + 4 + 1);
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}
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#define CHECKED_WRITE(name,len,data) \
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if (!write_chunk(name, len, data, file)) return 1;
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#define CHECKED_WRITE_BUFF(name,buff) \
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if (!write_chunk(name, sizeof(buff), &buff, file)) return 1;
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int PicoCdSaveState(void *file)
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{
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unsigned char buff[0x60];
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void *ym2612_regs = YM2612GetRegs();
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areaWrite("PicoSMCD", 1, 8, file);
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areaWrite(&PicoVer, 1, 4, file);
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memset(buff, 0, sizeof(buff));
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PicoAreaPackCpu(buff, 0);
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CHECKED_WRITE_BUFF(CHUNK_M68K, buff);
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CHECKED_WRITE_BUFF(CHUNK_RAM, Pico.ram);
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CHECKED_WRITE_BUFF(CHUNK_VRAM, Pico.vram);
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CHECKED_WRITE_BUFF(CHUNK_ZRAM, Pico.zram);
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CHECKED_WRITE_BUFF(CHUNK_CRAM, Pico.cram);
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CHECKED_WRITE_BUFF(CHUNK_VSRAM, Pico.vsram);
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CHECKED_WRITE_BUFF(CHUNK_MISC, Pico.m);
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CHECKED_WRITE_BUFF(CHUNK_VIDEO, Pico.video);
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if(PicoOpt&7) {
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memset(buff, 0, sizeof(buff));
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z80_pack(buff);
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CHECKED_WRITE_BUFF(CHUNK_Z80, buff);
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}
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if(PicoOpt&3)
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CHECKED_WRITE(CHUNK_PSG, 28*4, sn76496_regs);
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if(PicoOpt&1)
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CHECKED_WRITE(CHUNK_FM, 0x200+4, ym2612_regs);
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// TODO: cd stuff
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return 0;
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}
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static int g_read_offs = 0;
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#define CHECKED_READ(len,data) \
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if (areaRead(data, 1, len, file) != len) { \
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g_read_offs += len; \
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printf("areaRead: premature EOF\n"); \
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return 0; \
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}
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#define R_ERROR_RETURN(error) \
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{ \
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printf("PicoCdLoadState @ %x: " error "\n", g_read_offs); \
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return 1; \
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}
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#define CHECKED_READ2(len2,data) \
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if (len2 != len) R_ERROR_RETURN("unexpected len, wanted " #len2); \
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CHECKED_READ(len2, data)
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#define CHECKED_READ_BUFF(buff) CHECKED_READ2(sizeof(buff), &buff);
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int PicoCdLoadState(void *file)
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{
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unsigned char buff[0x60];
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int ver, len;
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void *ym2612_regs = YM2612GetRegs();
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g_read_offs = 0;
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CHECKED_READ(8, buff);
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if (strncmp((char *)buff, "PicoSMCD", 8)) R_ERROR_RETURN("bad header");
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CHECKED_READ(4, &ver);
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while (!areaEof(file))
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{
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CHECKED_READ(1, buff);
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CHECKED_READ(4, &len);
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if (len < 0 || len > 1024*256) R_ERROR_RETURN("bad length");
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switch (buff[0])
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{
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case CHUNK_M68K:
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CHECKED_READ_BUFF(buff);
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PicoAreaUnpackCpu(buff, 0);
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break;
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case CHUNK_Z80:
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CHECKED_READ_BUFF(buff);
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z80_unpack(buff);
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break;
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case CHUNK_RAM: CHECKED_READ_BUFF(Pico.ram); break;
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case CHUNK_VRAM: CHECKED_READ_BUFF(Pico.vram); break;
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case CHUNK_ZRAM: CHECKED_READ_BUFF(Pico.zram); break;
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case CHUNK_CRAM: CHECKED_READ_BUFF(Pico.cram); break;
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case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); break;
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case CHUNK_MISC: CHECKED_READ_BUFF(Pico.m); break;
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case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); break;
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case CHUNK_PSG: CHECKED_READ2(28*4, sn76496_regs); break;
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case CHUNK_FM:
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CHECKED_READ2(0x200+4, ym2612_regs);
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YM2612PicoStateLoad();
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break;
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}
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}
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return 0;
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}
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