mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-12 22:05:06 +01:00
30997a1c43
- added VFAT support and old files saved - corrected some docs - added SRAM crc calculation after SRAM saving on SDCARD - modified reload_rom actions order - fixed some vdp status bits
589 lines
16 KiB
C
589 lines
16 KiB
C
/****************************************************************************
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* Genesis Plus 1.2a
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*
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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***************************************************************************/
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#include "shared.h"
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#include "dvd.h"
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#include "font.h"
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#include "rominfo.h"
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#include "saveicon.h" /*** Nice little icon - thanks brakken! ***/
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/* Support for MemCards */
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/**
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* libOGC System Work Area
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*/
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static u8 SysArea[CARD_WORKAREA] ATTRIBUTE_ALIGN (32);
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/**
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* DMA Transfer Area.
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* Must be 32-byte aligned.
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* 64k SRAM + 2k Icon
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*/
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unsigned char savebuffer[0x24000] ATTRIBUTE_ALIGN (32);
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card_dir CardDir;
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card_file CardFile;
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card_stat CardStatus;
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extern int CARDSLOT;
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extern int use_SDCARD;
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int ManageSRAM (int direction);
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int ManageState (int direction);
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/****************************************************************************
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* SRAM autoload
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*
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* the detection order is the following:
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* MCARD (SLOTA) > MCARD (SLOTB) > SDCARD (SLOTA) > SDCARD (SLOTB)
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*
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*****************************************************************************/
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extern u8 SILENT;
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void sram_autoload()
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{
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int ret = 0;
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int i = 0;
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int old_cardslot = CARDSLOT;
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int old_sdcard = use_SDCARD;
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SILENT = 1; /* this should be transparent to the user */
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while ((i < 4) && (!ret))
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{
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use_SDCARD = (i&2) ? 1 : 0;
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CARDSLOT = (i&1) ? CARD_SLOTB : CARD_SLOTA;
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ret = ManageSRAM(1);
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i++;
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}
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if (!ret)
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{
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/* restore old settings if not found */
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CARDSLOT = old_cardslot;
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use_SDCARD = old_sdcard;
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}
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SILENT = 0;
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}
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/****************************************************************************
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* SDCARD Access functions
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*
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* We use the same buffer as for Memory Card manager
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* Function returns TRUE on success.
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*****************************************************************************/
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int SD_ManageFile(char *filename, int direction, int filetype)
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{
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char name[1024];
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sd_file *handle;
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int len = 0;
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int offset = 0;
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int filesize;
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unsigned long inbytes,outbytes;
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/* build complete SDCARD filename */
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sprintf (name, "dev%d:\\genplus\\saves\\%s", CARDSLOT, filename);
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/* open file */
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handle = direction ? SDCARD_OpenFile (name, "rb") :
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SDCARD_OpenFile (name, "wb");
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if (handle == NULL)
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{
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sprintf (filename, "Error opening %s", name);
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WaitPrompt(filename);
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return 0;
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}
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switch (direction)
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{
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case 0: /* SAVING */
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if (filetype) /* SRAM */
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{
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inbytes = 0x10000;
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outbytes = 0x12000;
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compress2 ((char *) &savebuffer[sizeof(outbytes)], &outbytes, (char *) &sram.sram, inbytes, 9);
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memcpy(&savebuffer[0], &outbytes, sizeof(outbytes));
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filesize = outbytes + sizeof(outbytes);
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}
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else filesize = state_save(&savebuffer[0]); /* STATE */
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len = SDCARD_WriteFile (handle, savebuffer, filesize);
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SDCARD_CloseFile (handle);
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if (len != filesize)
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{
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sprintf (filename, "Error writing %s", name);
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WaitPrompt (filename);
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return 0;
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}
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if (filetype) sram.crc = crc32 (0, &sram.sram[0], 0x10000);
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sprintf (filename, "Saved %d bytes successfully", filesize);
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WaitPrompt (filename);
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return 1;
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case 1: /* LOADING */
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while ((len = SDCARD_ReadFile (handle, &savebuffer[offset], 2048)) > 0) offset += len;
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if (filetype) /* SRAM */
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{
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memcpy(&inbytes,&savebuffer[0],sizeof(inbytes));
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outbytes = 0x10000;
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uncompress ((char *) &sram.sram, &outbytes, (char *) &savebuffer[sizeof(inbytes)], inbytes);
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sram.crc = crc32 (0, &sram.sram[0], outbytes);
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system_reset ();
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}
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else state_load(&savebuffer[0]); /* STATE */
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SDCARD_CloseFile (handle);
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sprintf (filename, "Loaded %d bytes successfully", offset);
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WaitPrompt (filename);
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return 1;
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}
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return 0;
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}
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/****************************************************************************
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* MountTheCard
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*
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* libOGC provides the CARD_Mount function, and it should be all you need.
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* However, experience with previous emulators has taught me that you are
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* better off doing a little bit more than that!
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*
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* Function returns TRUE on success.
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*****************************************************************************/
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int MountTheCard ()
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{
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int tries = 0;
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int CardError;
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while (tries < 10)
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{
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*(unsigned long *) (0xcc006800) |= 1 << 13; /*** Disable Encryption ***/
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uselessinquiry ();
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VIDEO_WaitVSync ();
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CardError = CARD_Mount (CARDSLOT, SysArea, NULL); /*** Don't need or want a callback ***/
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if (CardError == 0) return 1;
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else EXI_ProbeReset ();
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tries++;
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}
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return 0;
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}
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/****************************************************************************
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* CardFileExists
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*
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* Wrapper to search through the files on the card.
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* Returns TRUE if found.
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****************************************************************************/
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int CardFileExists (char *filename)
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{
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int CardError = CARD_FindFirst (CARDSLOT, &CardDir, TRUE);
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while (CardError != CARD_ERROR_NOFILE)
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{
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CardError = CARD_FindNext (&CardDir);
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if (strcmp ((char *) CardDir.filename, filename) == 0) return 1;
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}
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return 0;
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}
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/****************************************************************************
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* ManageSRAM
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*
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* Here is the main SRAM Management stuff.
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* The output file contains an icon (2K), 64 bytes comment and the SRAM (64k).
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* As memcards are allocated in blocks of 8k or more, you have a around
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* 6k bytes to save/load any other data you wish without altering any of the
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* main save / load code.
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*
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* direction == 0 save, 1 load.
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****************************************************************************/
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int ManageSRAM (int direction)
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{
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char filename[128];
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char action[80];
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int CardError;
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unsigned int SectorSize;
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int blocks;
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char comment[2][32] = { {"Genesis Plus 1.2a"}, {"SRAM Save"} };
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int outbytes = 0;
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int sbo;
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int i;
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unsigned long inzipped,outzipped;
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if (!genromsize) return 0;
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if (direction) ShowAction ("Loading SRAM ...");
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else ShowAction ("Saving SRAM ...");
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/* First, build a filename based on the information retrieved for this ROM */
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if (strlen (rominfo.domestic)) strcpy (filename, rominfo.domestic);
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else strcpy (filename, rominfo.international);
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/* As these names tend to be bulked with spaces, let's strip them */
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/* Name should be in 16 character blocks, so take first 16 */
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filename[16] = 0;
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for (i = strlen (filename) - 1; i > 0; i--)
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if (filename[i] != 32) break;
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filename[i + 1] = 0;
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/* Now add the 16bit checksum, to ensure it's the same ROM */
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sprintf (filename, "%s%02X.srm", filename, rominfo.checksum);
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strcpy (comment[1], filename);
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/* device is SDCARD, let's go */
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if (use_SDCARD) return SD_ManageFile(filename,direction,1);
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/* device is MCARD, we continue */
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if (direction == 0) /*** Saving ***/
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{
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/*** Build the output buffer ***/
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memcpy (&savebuffer, &icon, 2048);
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memcpy (&savebuffer[2048], &comment[0], 64);
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inzipped = 0x10000;
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outzipped = 0x12000;
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compress2 ((char *) &savebuffer[2112+sizeof(outzipped)], &outzipped, (char *) &sram.sram, inzipped, 9);
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memcpy(&savebuffer[2112], &outzipped, sizeof(outzipped));
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}
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outbytes = 2048 + 64 + outzipped + sizeof(outzipped);
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/*** Initialise the CARD system ***/
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memset (&SysArea, 0, CARD_WORKAREA);
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CARD_Init ("GENP", "00");
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/*** Attempt to mount the card ***/
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CardError = MountTheCard ();
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if (CardError)
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{
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/*** Retrieve the sector size ***/
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CardError = CARD_GetSectorSize (CARDSLOT, &SectorSize);
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switch (direction)
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{
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case 0: /*** Saving ***/
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/*** Determine number of blocks on this card ***/
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blocks = (outbytes / SectorSize) * SectorSize;
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if (outbytes % SectorSize) blocks += SectorSize;
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/*** Check if a previous save exists ***/
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if (CardFileExists (filename))
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{
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CardError = CARD_Open (CARDSLOT, filename, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error Open : %d", CardError);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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int size = CardFile.len;
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CARD_Close (&CardFile);
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if (size < blocks)
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{
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/* new size is bigger: check if there is enough space left */
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CardError = CARD_Create (CARDSLOT, "TEMP", blocks-size, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error Update : %d", CardError);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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CARD_Close (&CardFile);
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CARD_Delete(CARDSLOT, "TEMP");
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}
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/* always delete existing slot */
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CARD_Delete(CARDSLOT, filename);
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}
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/*** Create a new slot ***/
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CardError = CARD_Create (CARDSLOT, filename, blocks, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error create : %d %d", CardError, CARDSLOT);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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/*** Continue and save ***/
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CARD_GetStatus (CARDSLOT, CardFile.filenum, &CardStatus);
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CardStatus.icon_addr = 0x0;
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CardStatus.icon_fmt = 2;
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CardStatus.icon_speed = 1;
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CardStatus.comment_addr = 2048;
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CARD_SetStatus (CARDSLOT, CardFile.filenum, &CardStatus);
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/*** And write the blocks out ***/
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sbo = 0;
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while (outbytes > 0)
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{
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CardError = CARD_Write (&CardFile, &savebuffer[sbo], SectorSize, sbo);
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outbytes -= SectorSize;
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sbo += SectorSize;
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}
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CARD_Close (&CardFile);
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CARD_Unmount (CARDSLOT);
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sram.crc = crc32 (0, &sram.sram[0], 0x10000);
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sprintf (action, "Saved %d bytes successfully", blocks);
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WaitPrompt (action);
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return 1;
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default: /*** Loading ***/
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if (!CardFileExists (filename))
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{
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WaitPrompt ("No SRAM File Found");
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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memset (&CardFile, 0, sizeof (CardFile));
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CardError = CARD_Open (CARDSLOT, filename, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error Open : %d", CardError);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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blocks = CardFile.len;
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if (blocks < SectorSize) blocks = SectorSize;
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if (blocks % SectorSize) blocks++;
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/*** Just read the file back in ***/
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sbo = 0;
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int size = blocks;
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while (blocks > 0)
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{
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CARD_Read (&CardFile, &savebuffer[sbo], SectorSize, sbo);
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sbo += SectorSize;
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blocks -= SectorSize;
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}
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CARD_Close (&CardFile);
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CARD_Unmount (CARDSLOT);
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/* Copy to SRAM */
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memcpy(&inzipped,&savebuffer[2112],sizeof(inzipped));
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outzipped = 0x10000;
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uncompress ((char *) &sram.sram, &outzipped, (char *) &savebuffer[2112+sizeof(inzipped)], inzipped);
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sram.crc = crc32 (0, &sram.sram[0], 0x10000);
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system_reset ();
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/*** Inform user ***/
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sprintf (action, "Loaded %d bytes successfully", size);
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WaitPrompt (action);
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return 1;
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}
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}
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else WaitPrompt ("Unable to mount memory card");
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return 0; /*** Signal failure ***/
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}
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/****************************************************************************
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* ManageSTATE
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*
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* Here is the main Freeze File Management stuff.
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* The output file contains an icon (2K), 64 bytes comment and the STATE (~128k)
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*
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* direction == 0 save, 1 load.
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****************************************************************************/
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int ManageState (int direction)
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{
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char filename[128];
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char action[80];
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int CardError;
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unsigned int SectorSize;
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int blocks;
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char comment[2][32] = { {"Genesis Plus 1.2a [FRZ]"}, {"Freeze State"} };
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int outbytes;
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int sbo;
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int i;
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int state_size = 0;
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if (!genromsize) return 0;
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if (direction) ShowAction ("Loading State ...");
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else ShowAction ("Saving State ...");
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/* First, build a filename based on the information retrieved for this ROM */
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if (strlen (rominfo.domestic)) strcpy (filename, rominfo.domestic);
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else strcpy (filename, rominfo.international);
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/* As these names tend to be bulked with spaces, let's strip them */
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/* Name should be in 16 character blocks, so take first 16 */
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filename[16] = 0;
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for (i = strlen (filename) - 1; i > 0; i--) if (filename[i] != 32) break;
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filename[i + 1] = 0;
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/* Now add the 16bit checksum, to ensure it's the same ROM */
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sprintf (filename, "%s%02X.gpz", filename, rominfo.checksum);
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strcpy (comment[1], filename);
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/* device is SDCARD, let's go */
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if (use_SDCARD) return SD_ManageFile(filename,direction,0);
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/* device is MCARD, we continue */
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if (direction == 0) /* Saving */
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{
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/* Build the output buffer */
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memcpy (&savebuffer, &icon, 2048);
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memcpy (&savebuffer[2048], &comment[0], 64);
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state_size = state_save(&savebuffer[2112]);
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}
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outbytes = 2048 + 64 + state_size;
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/*** Initialise the CARD system ***/
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memset (&SysArea, 0, CARD_WORKAREA);
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CARD_Init ("GENP", "00");
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/*** Attempt to mount the card ***/
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CardError = MountTheCard ();
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if (CardError)
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{
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/*** Retrieve the sector size ***/
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CardError = CARD_GetSectorSize (CARDSLOT, &SectorSize);
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switch (direction)
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{
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case 0: /*** Saving ***/
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/*** Determine number of blocks on this card ***/
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blocks = (outbytes / SectorSize) * SectorSize;
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if (outbytes % SectorSize) blocks += SectorSize;
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/*** Check if a previous save exists ***/
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if (CardFileExists (filename))
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{
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CardError = CARD_Open (CARDSLOT, filename, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error Open : %d", CardError);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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int size = CardFile.len;
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CARD_Close (&CardFile);
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if (size < blocks)
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{
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/* new size is bigger: check if there is enough space left */
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CardError = CARD_Create (CARDSLOT, "TEMP", blocks-size, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error Update : %d", CardError);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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CARD_Close (&CardFile);
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CARD_Delete(CARDSLOT, "TEMP");
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}
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/* always delete existing slot */
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CARD_Delete(CARDSLOT, filename);
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}
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/*** Create a new slot ***/
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CardError = CARD_Create (CARDSLOT, filename, blocks, &CardFile);
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if (CardError)
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{
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sprintf (action, "Error create : %d %d", CardError, CARDSLOT);
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WaitPrompt (action);
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CARD_Unmount (CARDSLOT);
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return 0;
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}
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/*** Continue and save ***/
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CARD_GetStatus (CARDSLOT, CardFile.filenum, &CardStatus);
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CardStatus.icon_addr = 0x0;
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CardStatus.icon_fmt = 2;
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CardStatus.icon_speed = 1;
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CardStatus.comment_addr = 2048;
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CARD_SetStatus (CARDSLOT, CardFile.filenum, &CardStatus);
|
|
|
|
/*** And write the blocks out ***/
|
|
sbo = 0;
|
|
while (outbytes > 0)
|
|
{
|
|
CardError = CARD_Write (&CardFile, &savebuffer[sbo], SectorSize, sbo);
|
|
outbytes -= SectorSize;
|
|
sbo += SectorSize;
|
|
}
|
|
|
|
CARD_Close (&CardFile);
|
|
CARD_Unmount (CARDSLOT);
|
|
sprintf (action, "Saved %d bytes successfully", blocks);
|
|
WaitPrompt (action);
|
|
return 1;
|
|
|
|
default: /*** Loading ***/
|
|
if (!CardFileExists (filename))
|
|
{
|
|
WaitPrompt ("No Savestate Found");
|
|
CARD_Unmount (CARDSLOT);
|
|
return 0;
|
|
}
|
|
|
|
memset (&CardFile, 0, sizeof (CardFile));
|
|
CardError = CARD_Open (CARDSLOT, filename, &CardFile);
|
|
if (CardError)
|
|
{
|
|
sprintf (action, "Error Open : %d", CardError);
|
|
WaitPrompt (action);
|
|
CARD_Unmount (CARDSLOT);
|
|
return 0;
|
|
}
|
|
|
|
blocks = CardFile.len;
|
|
if (blocks < SectorSize) blocks = SectorSize;
|
|
if (blocks % SectorSize) blocks++;
|
|
|
|
/*** Just read the file back in ***/
|
|
sbo = 0;
|
|
int size = blocks;
|
|
while (blocks > 0)
|
|
{
|
|
CARD_Read (&CardFile, &savebuffer[sbo], SectorSize, sbo);
|
|
sbo += SectorSize;
|
|
blocks -= SectorSize;
|
|
}
|
|
CARD_Close (&CardFile);
|
|
CARD_Unmount (CARDSLOT);
|
|
|
|
state_load(&savebuffer[2112]);
|
|
|
|
/*** Inform user ***/
|
|
sprintf (action, "Loaded %d bytes successfully", size);
|
|
WaitPrompt (action);
|
|
return 1;
|
|
}
|
|
}
|
|
else WaitPrompt ("Unable to mount memory card");
|
|
return 0; /*** Signal failure ***/
|
|
}
|