238 lines
6.8 KiB
C
238 lines
6.8 KiB
C
/* sd2snes - SD card based universal cartridge for the SNES
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Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
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AVR firmware portion
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Inspired by and based on code from sd2iec, written by Ingo Korb et al.
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See sdcard.c|h, config.h.
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FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
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see ff.c|h.
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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; version 2 of the License only.
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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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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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smc.c: SMC file related operations
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*/
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#include "fileops.h"
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#include "config.h"
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#include "uart.h"
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#include "smc.h"
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#include "string.h"
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snes_romprops_t romprops;
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uint32_t hdr_addr[6] = {0xffb0, 0x101b0, 0x7fb0, 0x81b0, 0x40ffb0, 0x4101b0};
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uint8_t countAllASCII(uint8_t* data, int size) {
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uint8_t res = 0;
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do {
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size--;
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if(data[size] >= 0x20 && data[size] <= 0x7e) {
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res++;
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}
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} while (size);
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return res;
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}
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uint8_t countAllJISX0201(uint8_t* data, int size) {
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uint8_t res = 0;
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do {
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size--;
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if((data[size] >= 0x20 && data[size] <= 0x7e)
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||(data[size] >= 0xa1 && data[size] <= 0xdf)) {
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res++;
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}
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} while (size);
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return res;
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}
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uint8_t isFixed(uint8_t* data, int size, uint8_t value) {
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uint8_t res = 1;
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do {
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size--;
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if(data[size] != value) {
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res = 0;
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}
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} while (size);
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return res;
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}
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uint8_t checkChksum(uint16_t cchk, uint16_t chk) {
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uint32_t sum = cchk + chk;
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uint8_t res = 0;
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if(sum==0x0000ffff) {
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res = 0x10;
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}
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return res;
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}
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void smc_id(snes_romprops_t* props) {
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uint8_t score, maxscore=1, score_idx=2; /* assume LoROM */
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snes_header_t* header = &(props->header);
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props->has_dspx = 0;
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for(uint8_t num = 0; num < 6; num++) {
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if(!file_readblock(header, hdr_addr[num], sizeof(snes_header_t))
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|| file_res) {
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score = 0;
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} else {
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score = smc_headerscore(header)/(1+(num&1));
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if((file_handle.fsize & 0x2ff) == 0x200) {
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if(num&1) {
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score+=20;
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} else {
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score=0;
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}
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} else {
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if(!(num&1)) {
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score+=20;
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} else {
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score=0;
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}
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}
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}
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//printf("%d: offset = %lX; score = %d\n", num, hdr_addr[num], score); // */
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if(score>=maxscore) {
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score_idx=num;
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maxscore=score;
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}
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}
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if(score_idx & 1) {
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props->offset = 0x200;
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} else {
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props->offset = 0;
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}
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/* restore the chosen one */
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/*dprintf("winner is %d\n", score_idx); */
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file_readblock(header, hdr_addr[score_idx], sizeof(snes_header_t));
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if(header->name[0x13] == 0x00 || header->name[0x13] == 0xff) {
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if(header->name[0x14] == 0x00) {
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const uint8_t n15 = header->map;
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if(n15 == 0x00 || n15 == 0x80 || n15 == 0x84 || n15 == 0x9c
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|| n15 == 0xbc || n15 == 0xfc) {
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if(header->licensee == 0x33 || header->licensee == 0xff) {
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props->mapper_id = 0;
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/*XXX do this properly */
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props->ramsize_bytes = 0x8000;
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props->romsize_bytes = 0x100000;
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props->expramsize_bytes = 0;
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props->mapper_id = 3; /* BS-X Memory Map */
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return;
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}
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}
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}
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}
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switch(header->map & 0xef) {
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case 0x21: /* HiROM */
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if(header->map == 0x31 && (header->carttype == 0x03 || header->carttype == 0x05)) {
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props->has_dspx = 1;
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props->mapper_id = 4; /* DSPx HiROM */
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props->necdsp_fw = DSPFW_1B;
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} else {
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props->mapper_id = 0; /* regular HiROM */
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}
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break;
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case 0x20: /* LoROM */
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if ((header->map == 0x20 && header->carttype == 0x03) ||
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(header->map == 0x30 && header->carttype == 0x05 && header->licensee != 0xb2)) {
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props->mapper_id = 5;
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props->has_dspx = 1;
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// Pilotwings uses DSP1 instead of DSP1B
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if(!memcmp(header->name, "PILOTWINGS", 10)) {
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props->necdsp_fw = DSPFW_1;
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} else {
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props->necdsp_fw = DSPFW_1B;
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}
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} else if (header->map == 0x20 && header->carttype == 0x05) {
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props->has_dspx = 1;
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props->mapper_id = 5; /* DSPx LoROM */
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props->necdsp_fw = DSPFW_2;
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} else if (header->map == 0x30 && header->carttype == 0x05 && header->licensee == 0xb2) {
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props->has_dspx = 1;
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props->mapper_id = 5; /* DSPx LoROM */
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props->necdsp_fw = DSPFW_3;
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} else if (header->map == 0x30 && header->carttype == 0x03) {
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props->has_dspx = 1;
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props->mapper_id = 5; /* DSPx LoROM */
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props->necdsp_fw = DSPFW_4;
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} else {
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props->mapper_id = 1; /* regular LoROM */
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}
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break;
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case 0x25: /* ExHiROM */
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props->mapper_id = 2;
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break;
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case 0x22: /* ExLoROM */
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if(file_handle.fsize > 0x400200) {
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props->mapper_id = 6; /* SO96 */
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} else {
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props->mapper_id = 1;
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}
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break;
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default: /* invalid/unsupported mapper, use header location */
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switch(score_idx) {
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case 0:
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case 1:
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props->mapper_id = 0;
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break;
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case 2:
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case 3:
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if(file_handle.fsize > 0x800200) {
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props->mapper_id = 6; /* SO96 interleaved */
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} else if(file_handle.fsize > 0x400200) {
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props->mapper_id = 1; /* ExLoROM */
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} else {
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props->mapper_id = 1; /* LoROM */
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}
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break;
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case 4:
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case 5:
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props->mapper_id = 2;
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break;
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default:
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props->mapper_id = 1; // whatever
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}
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}
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if(header->romsize == 0 || header->romsize > 13) {
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header->romsize = 13;
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}
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props->ramsize_bytes = (uint32_t)1024 << header->ramsize;
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props->romsize_bytes = (uint32_t)1024 << header->romsize;
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props->expramsize_bytes = (uint32_t)1024 << header->expramsize;
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/*dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes); */
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if(props->ramsize_bytes > 32768 || props->ramsize_bytes < 2048) {
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props->ramsize_bytes = 0;
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}
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/*dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes); */
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}
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uint8_t smc_headerscore(snes_header_t* header) {
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uint8_t score=0;
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score += countAllASCII(header->maker, sizeof(header->maker));
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score += countAllASCII(header->gamecode, sizeof(header->gamecode));
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score += isFixed(header->fixed_00, sizeof(header->fixed_00), 0x00);
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score += countAllJISX0201(header->name, sizeof(header->name));
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score += 3*isFixed(&header->licensee, sizeof(header->licensee), 0x33);
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score += checkChksum(header->cchk, header->chk);
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return score;
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}
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