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Genesis-Plus-GX/gx/fileio/file_slot.c

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/*
* file_slot.c
*
* FAT and Memory Card SRAM/State slots managment
*
* Copyright Eke-Eke (2008-2021), based on original code from Softdev (2006)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
#include "file_slot.h"
#include "file_load.h"
#include "gui.h"
#include "filesel.h"
#include "saveicon.h"
/**
* libOGC CARD System Work Area
*/
static u8 SysArea[CARD_WORKAREA] ATTRIBUTE_ALIGN (32);
/* Mega CD backup RAM stuff */
static u32 brm_crc[2];
static char brm_filename[3][32] = {CD_BRAM_JP, CD_BRAM_EU, CD_BRAM_US};
static u8 brm_format[0x40] =
{
0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x00,0x00,0x00,0x00,0x40,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x53,0x45,0x47,0x41,0x5f,0x43,0x44,0x5f,0x52,0x4f,0x4d,0x00,0x01,0x00,0x00,0x00,
0x52,0x41,0x4d,0x5f,0x43,0x41,0x52,0x54,0x52,0x49,0x44,0x47,0x45,0x5f,0x5f,0x5f
};
/****************************************************************************
* CardMount
*
* libOGC provides the CARD_Mount function, and it should be all you need.
* However, experience with previous emulators has taught me that you are
* better off doing a little bit more than that!
*
*****************************************************************************/
static int CardMount(int slot)
{
int tries = 0;
#ifdef HW_RVL
*(unsigned long *) (0xCD006800) |= 1 << 13; /*** Disable Encryption ***/
#else
*(unsigned long *) (0xCC006800) |= 1 << 13; /*** Disable Encryption ***/
#endif
while (tries < 10)
{
VIDEO_WaitVSync ();
if (CARD_Mount(slot, SysArea, NULL) == CARD_ERROR_READY)
return 1;
else
EXI_ProbeReset ();
tries++;
}
return 0;
}
/****************************************************************************
* Slot Management
*
*
****************************************************************************/
void slot_autoload(int slot, int device)
{
/* Mega CD backup RAM specific */
if (!slot && (system_hw == SYSTEM_MCD))
{
/* automatically load internal backup RAM */
FILE *fp = fopen(brm_filename[((region_code ^ 0x40) >> 6) - 1], "rb");
if (fp != NULL)
{
fread(scd.bram, 0x2000, 1, fp);
fclose(fp);
/* update CRC */
brm_crc[0] = crc32(0, scd.bram, 0x2000);
}
else
{
/* force internal backup RAM format (does not use previous region backup RAM) */
scd.bram[0x1fff] = 0;
}
/* check if internal backup RAM is correctly formatted */
if (memcmp(scd.bram + 0x2000 - 0x20, brm_format + 0x20, 0x20))
{
/* clear internal backup RAM */
memset(scd.bram, 0x00, 0x2000 - 0x40);
/* internal Backup RAM size fields */
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = 0x00;
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (sizeof(scd.bram) / 64) - 3;
/* format internal backup RAM */
memcpy(scd.bram + 0x2000 - 0x40, brm_format, 0x40);
/* clear CRC to force file saving (in case previous region backup RAM was also formatted) */
brm_crc[0] = 0;
}
/* automatically load cartridge backup RAM (if enabled) */
if (scd.cartridge.id)
{
fp = fopen(CART_BRAM, "rb");
if (fp != NULL)
{
int filesize = scd.cartridge.mask + 1;
int done = 0;
/* Read into buffer (2k blocks) */
while (filesize > CHUNKSIZE)
{
fread(scd.cartridge.area + done, CHUNKSIZE, 1, fp);
done += CHUNKSIZE;
filesize -= CHUNKSIZE;
}
/* Read remaining bytes */
if (filesize)
{
fread(scd.cartridge.area + done, filesize, 1, fp);
}
/* close file */
fclose(fp);
/* update CRC */
brm_crc[1] = crc32(0, scd.cartridge.area, scd.cartridge.mask + 1);
}
/* check if cartridge backup RAM is correctly formatted */
if (memcmp(scd.cartridge.area + scd.cartridge.mask + 1 - 0x20, brm_format + 0x20, 0x20))
{
/* clear cartridge backup RAM */
memset(scd.cartridge.area, 0x00, scd.cartridge.mask + 1);
/* Cartridge Backup RAM size fields */
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = (((scd.cartridge.mask + 1) / 64) - 3) >> 8;
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (((scd.cartridge.mask + 1) / 64) - 3) & 0xff;
/* format cartridge backup RAM */
memcpy(scd.cartridge.area + scd.cartridge.mask + 1 - 0x40, brm_format, 0x40);
}
}
}
/* configurable SRAM & State auto-saving */
if ((slot && !(config.s_auto & 2)) || (!slot && !(config.s_auto & 1)))
{
return;
}
if (strlen(rom_filename))
{
SILENT = 1;
slot_load(slot, device);
SILENT = 0;
}
}
void slot_autosave(int slot, int device)
{
/* Mega CD backup RAM specific */
if (!slot && (system_hw == SYSTEM_MCD))
{
/* verify that internal backup RAM has been modified */
if (crc32(0, scd.bram, 0x2000) != brm_crc[0])
{
/* check if it is correctly formatted before saving */
if (!memcmp(scd.bram + 0x2000 - 0x20, brm_format + 0x20, 0x20))
{
FILE *fp = fopen(brm_filename[((region_code ^ 0x40) >> 6) - 1], "wb");
if (fp != NULL)
{
fwrite(scd.bram, 0x2000, 1, fp);
fclose(fp);
/* update CRC */
brm_crc[0] = crc32(0, scd.bram, 0x2000);
}
}
}
/* verify that cartridge backup RAM has been modified */
if (scd.cartridge.id && (crc32(0, scd.cartridge.area, scd.cartridge.mask + 1) != brm_crc[1]))
{
/* check if it is correctly formatted before saving */
if (!memcmp(scd.cartridge.area + scd.cartridge.mask + 1 - 0x20, brm_format + 0x20, 0x20))
{
FILE *fp = fopen(CART_BRAM, "wb");
if (fp != NULL)
{
int filesize = scd.cartridge.mask + 1;
int done = 0;
/* Write to file (2k blocks) */
while (filesize > CHUNKSIZE)
{
fwrite(scd.cartridge.area + done, CHUNKSIZE, 1, fp);
done += CHUNKSIZE;
filesize -= CHUNKSIZE;
}
/* Write remaining bytes */
if (filesize)
{
fwrite(scd.cartridge.area + done, filesize, 1, fp);
}
/* Close file */
fclose(fp);
/* update CRC */
brm_crc[1] = crc32(0, scd.cartridge.area, scd.cartridge.mask + 1);
}
}
}
}
/* configurable SRAM & State auto-saving */
if ((slot && !(config.s_auto & 2)) || (!slot && !(config.s_auto & 1)))
{
return;
}
if (strlen(rom_filename))
{
SILENT = 1;
slot_save(slot, device);
SILENT = 0;
}
}
void slot_autodetect(int slot, int device, t_slot *ptr)
{
if (!ptr) return;
char filename[MAXPATHLEN];
memset(ptr,0,sizeof(t_slot));
if (!device)
{
/* FAT support */
if (slot > 0)
{
sprintf (filename,"%s/saves/%s.gp%d", DEFAULT_PATH, rom_filename, slot - 1);
}
else
{
sprintf (filename,"%s/saves/%s.srm", DEFAULT_PATH, rom_filename);
}
/* Open file */
FILE *fp = fopen(filename, "rb");
if (fp)
{
/* Retrieve date & close */
struct stat filestat;
stat(filename, &filestat);
struct tm *timeinfo = localtime(&filestat.st_mtime);
ptr->year = 1900 + timeinfo->tm_year;
ptr->month = timeinfo->tm_mon + 1;
ptr->day = timeinfo->tm_mday;
ptr->hour = timeinfo->tm_hour;
ptr->min = timeinfo->tm_min;
fclose(fp);
ptr->valid = 1;
}
}
else
{
/* Memory Card support */
if (slot > 0)
sprintf(filename,"MD-%04X.gp%d", rominfo.realchecksum, slot - 1);
else
sprintf(filename,"MD-%04X.srm", rominfo.realchecksum);
/* Initialise the CARD system */
memset(&SysArea, 0, CARD_WORKAREA);
CARD_Init("GENP", "00");
/* CARD slot */
device--;
/* Mount CARD */
if (CardMount(device))
{
/* Open file */
card_file CardFile;
if (CARD_Open(device, filename, &CardFile) == CARD_ERROR_READY)
{
/* Retrieve date & close */
card_stat CardStatus;
CARD_GetStatus(device, CardFile.filenum, &CardStatus);
time_t rawtime = CardStatus.time;
struct tm *timeinfo = localtime(&rawtime);
ptr->year = 1900 + timeinfo->tm_year;
ptr->month = timeinfo->tm_mon + 1;
ptr->day = timeinfo->tm_mday;
ptr->hour = timeinfo->tm_hour;
ptr->min = timeinfo->tm_min;
CARD_Close(&CardFile);
ptr->valid = 1;
}
CARD_Unmount(device);
}
}
}
int slot_delete(int slot, int device)
{
char filename[MAXPATHLEN];
int ret = 0;
if (!device)
{
/* FAT support */
if (slot > 0)
{
/* remove screenshot */
sprintf(filename,"%s/saves/%s__%d.png", DEFAULT_PATH, rom_filename, slot - 1);
remove(filename);
sprintf (filename,"%s/saves/%s.gp%d", DEFAULT_PATH, rom_filename, slot - 1);
}
else
{
sprintf (filename,"%s/saves/%s.srm", DEFAULT_PATH, rom_filename);
}
/* Delete file */
ret = remove(filename);
}
else
{
/* Memory Card support */
if (slot > 0)
sprintf(filename,"MD-%04X.gp%d", rominfo.realchecksum, slot - 1);
else
sprintf(filename,"MD-%04X.srm", rominfo.realchecksum);
/* Initialise the CARD system */
memset(&SysArea, 0, CARD_WORKAREA);
CARD_Init("GENP", "00");
/* CARD slot */
device--;
/* Mount CARD */
if (CardMount(device))
{
/* Delete file */
ret = CARD_Delete(device,filename);
CARD_Unmount(device);
}
}
return ret;
}
int slot_load(int slot, int device)
{
char filename[MAXPATHLEN];
unsigned long filesize, done = 0;
u8 *buffer;
/* File Type */
if (slot > 0)
{
GUI_MsgBoxOpen("Information","Loading State ...",1);
}
else
{
if (!sram.on)
{
GUI_WaitPrompt("Error","Backup RAM is disabled !");
return 0;
}
GUI_MsgBoxOpen("Information","Loading Backup RAM ...",1);
}
/* Device Type */
if (!device)
{
/* FAT file */
if (slot > 0)
{
sprintf (filename,"%s/saves/%s.gp%d", DEFAULT_PATH, rom_filename, slot - 1);
}
else
{
sprintf (filename,"%s/saves/%s.srm", DEFAULT_PATH, rom_filename);
}
/* Open file */
FILE *fp = fopen(filename, "rb");
if (!fp)
{
GUI_WaitPrompt("Error","Unable to open file !");
return 0;
}
/* Get file size */
fseek(fp, 0, SEEK_END);
filesize = ftell(fp);
fseek(fp, 0, SEEK_SET);
/* allocate buffer */
buffer = (u8 *)memalign(32,filesize);
if (!buffer)
{
GUI_WaitPrompt("Error","Unable to allocate memory !");
fclose(fp);
return 0;
}
/* Read into buffer (2k blocks) */
while (filesize > CHUNKSIZE)
{
fread(buffer + done, CHUNKSIZE, 1, fp);
done += CHUNKSIZE;
filesize -= CHUNKSIZE;
}
/* Read remaining bytes */
fread(buffer + done, filesize, 1, fp);
done += filesize;
/* Close file */
fclose(fp);
}
else
{
/* Memory Card file */
if (slot > 0)
{
sprintf(filename, "MD-%04X.gp%d", rominfo.realchecksum, slot - 1);
}
else
{
sprintf(filename, "MD-%04X.srm", rominfo.realchecksum);
}
/* Initialise the CARD system */
char action[64];
memset(&SysArea, 0, CARD_WORKAREA);
CARD_Init("GENP", "00");
/* CARD slot */
device--;
/* Attempt to mount the card */
if (!CardMount(device))
{
GUI_WaitPrompt("Error","Unable to mount memory card");
return 0;
}
/* Retrieve the sector size */
u32 SectorSize = 0;
int CardError = CARD_GetSectorSize(device, &SectorSize);
if (!SectorSize)
{
sprintf(action, "Invalid sector size (%d)", CardError);
GUI_WaitPrompt("Error",action);
CARD_Unmount(device);
return 0;
}
/* Open file */
card_file CardFile;
CardError = CARD_Open(device, filename, &CardFile);
if (CardError)
{
sprintf(action, "Unable to open file (%d)", CardError);
GUI_WaitPrompt("Error",action);
CARD_Unmount(device);
return 0;
}
/* Get file size */
filesize = CardFile.len;
if (filesize % SectorSize)
{
filesize = ((filesize / SectorSize) + 1) * SectorSize;
}
/* Allocate buffer */
u8 *in = (u8 *)memalign(32, filesize);
if (!in)
{
GUI_WaitPrompt("Error","Unable to allocate memory !");
CARD_Close(&CardFile);
CARD_Unmount(device);
return 0;
}
/* Read file sectors */
while (filesize > 0)
{
CARD_Read(&CardFile, &in[done], SectorSize, done);
done += SectorSize;
filesize -= SectorSize;
}
/* Close file */
CARD_Close(&CardFile);
CARD_Unmount(device);
/* Uncompressed file size */
memcpy(&filesize, in + 2112, 4);
buffer = (u8 *)memalign(32, filesize);
if (!buffer)
{
free(in);
GUI_WaitPrompt("Error","Unable to allocate memory !");
return 0;
}
/* Uncompress file */
uncompress ((Bytef *)buffer, &filesize, (Bytef *)(in + 2112 + 4), done - 2112 - 4);
done = filesize;
free(in);
}
if (slot > 0)
{
/* Load state */
if (state_load(buffer) <= 0)
{
free(buffer);
GUI_WaitPrompt("Error","Invalid state file !");
return 0;
}
}
else
{
/* load SRAM (max. 64 KB)*/
if (done < 0x10000)
{
memcpy(sram.sram, buffer, done);
memset(sram.sram + done, 0xFF, 0x10000 - done);
}
else
{
memcpy(sram.sram, buffer, 0x10000);
}
/* update CRC */
sram.crc = crc32(0, sram.sram, 0x10000);
}
free(buffer);
GUI_MsgBoxClose();
return 1;
}
int slot_save(int slot, int device)
{
char filename[MAXPATHLEN];
unsigned long filesize, done = 0;
u8 *buffer;
if (slot > 0)
{
GUI_MsgBoxOpen("Information","Saving State ...",1);
/* allocate buffer */
buffer = (u8 *)memalign(32,STATE_SIZE);
if (!buffer)
{
GUI_WaitPrompt("Error","Unable to allocate memory !");
return 0;
}
filesize = state_save(buffer);
}
else
{
/* only save if SRAM is enabled */
if (!sram.on)
{
GUI_WaitPrompt("Error","Backup RAM disabled !");
return 0;
}
/* max. supported SRAM size */
filesize = 0x10000;
/* only save modified SRAM size */
do
{
if (sram.sram[filesize-1] != 0xff)
break;
}
while (--filesize > 0);
/* only save if SRAM has been modified */
if ((filesize == 0) || (crc32(0, &sram.sram[0], 0x10000) == sram.crc))
{
GUI_WaitPrompt("Warning","Backup RAM not modified !");
return 0;
}
GUI_MsgBoxOpen("Information","Saving Backup RAM ...",1);
/* allocate buffer */
buffer = (u8 *)memalign(32, filesize);
if (!buffer)
{
GUI_WaitPrompt("Error","Unable to allocate memory !");
return 0;
}
/* copy SRAM data */
memcpy(buffer, sram.sram, filesize);
/* update CRC */
sram.crc = crc32(0, sram.sram, 0x10000);
}
/* Device Type */
if (!device)
{
/* FAT filename */
if (slot > 0)
{
sprintf(filename, "%s/saves/%s.gp%d", DEFAULT_PATH, rom_filename, slot - 1);
}
else
{
sprintf(filename, "%s/saves/%s.srm", DEFAULT_PATH, rom_filename);
}
/* Open file */
FILE *fp = fopen(filename, "wb");
if (!fp)
{
GUI_WaitPrompt("Error","Unable to open file !");
free(buffer);
return 0;
}
/* Write from buffer (2k blocks) */
while (filesize > CHUNKSIZE)
{
fwrite(buffer + done, CHUNKSIZE, 1, fp);
done += CHUNKSIZE;
filesize -= CHUNKSIZE;
}
/* Write remaining bytes */
fwrite(buffer + done, filesize, 1, fp);
done += filesize;
/* Close file */
fclose(fp);
free(buffer);
/* Close message box */
GUI_MsgBoxClose();
/* Save state screenshot */
if (slot > 0)
{
sprintf(filename,"%s/saves/%s__%d.png", DEFAULT_PATH, rom_filename, slot - 1);
gxSaveScreenshot(filename);
}
}
else
{
/* Memory Card filename */
if (slot > 0)
{
sprintf(filename, "MD-%04X.gp%d", rominfo.realchecksum, slot - 1);
}
else
{
sprintf(filename, "MD-%04X.srm", rominfo.realchecksum);
}
/* Initialise the CARD system */
char action[64];
memset(&SysArea, 0, CARD_WORKAREA);
CARD_Init("GENP", "00");
/* CARD slot */
device--;
/* Attempt to mount the card */
if (!CardMount(device))
{
GUI_WaitPrompt("Error","Unable to mount memory card");
free(buffer);
return 0;
}
/* Retrieve sector size */
u32 SectorSize = 0;
int CardError = CARD_GetSectorSize(device, &SectorSize);
if (!SectorSize)
{
sprintf(action, "Invalid sector size (%d)", CardError);
GUI_WaitPrompt("Error",action);
CARD_Unmount(device);
free(buffer);
return 0;
}
/* Build output buffer */
u8 *out = (u8 *)memalign(32, filesize + 2112 + 4);
if (!out)
{
GUI_WaitPrompt("Error","Unable to allocate memory !");
CARD_Unmount(device);
free(buffer);
return 0;
}
/* Memory Card file header */
char comment[2][32] = { {"Genesis Plus GX"}, {"SRAM Save"} };
strcpy (comment[1], filename);
memcpy (&out[0], &icon, 2048);
memcpy (&out[2048], &comment[0], 64);
/* uncompressed size */
done = filesize;
memcpy(&out[2112], &done, 4);
/* compress file */
compress2 ((Bytef *)&out[2112 + 4], &filesize, (Bytef *)buffer, done, 9);
/* Adjust file size */
filesize = filesize + 4 + 2112;
if (filesize % SectorSize)
{
filesize = ((filesize / SectorSize) + 1) * SectorSize;
}
/* Check if file already exists */
card_file CardFile;
if (CARD_Open(device, filename, &CardFile) == CARD_ERROR_READY)
{
int size = filesize - CardFile.len;
CARD_Close(&CardFile);
memset(&CardFile,0,sizeof(CardFile));
/* Check file new size */
if (size > 0)
{
CardError = CARD_Create(device, "TEMP", size, &CardFile);
if (CardError)
{
sprintf(action, "Unable to increase file size (%d)", CardError);
GUI_WaitPrompt("Error",action);
CARD_Unmount(device);
free(out);
free(buffer);
return 0;
}
/* delete temporary file */
CARD_Close(&CardFile);
memset(&CardFile,0,sizeof(CardFile));
CARD_Delete(device, "TEMP");
}
/* delete previously existing file */
CARD_Delete(device, filename);
}
/* Create a new file */
CardError = CARD_Create(device, filename, filesize, &CardFile);
if (CardError)
{
sprintf(action, "Unable to create file (%d)", CardError);
GUI_WaitPrompt("Error",action);
CARD_Unmount(device);
free(out);
free(buffer);
return 0;
}
/* Update file informations */
time_t rawtime;
time(&rawtime);
card_stat CardStatus;
CARD_GetStatus(device, CardFile.filenum, &CardStatus);
CardStatus.icon_addr = 0x0;
CardStatus.icon_fmt = 2;
CardStatus.icon_speed = 1;
CardStatus.comment_addr = 2048;
CardStatus.time = rawtime;
CARD_SetStatus(device, CardFile.filenum, &CardStatus);
/* Write file sectors */
while (filesize > 0)
{
CARD_Write(&CardFile, &out[done], SectorSize, done);
filesize -= SectorSize;
done += SectorSize;
}
/* Close file */
CARD_Close(&CardFile);
CARD_Unmount(device);
free(out);
free(buffer);
/* Close message box */
GUI_MsgBoxClose();
}
return 1;
}
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