From 9b3361b47a1c2be053b4e5a7c13d9ba014a75715 Mon Sep 17 00:00:00 2001
From: Robin Jones <networkfusion@users.noreply.github.com>
Date: Sun, 12 Mar 2023 18:37:37 +0000
Subject: [PATCH] Work on simple save database

---
 Makefile                |  1 +
 src/menu/rom_database.c | 82 +++++++++++++++++++++++++++++++++++++++++
 src/menu/rom_database.h | 10 +++++
 3 files changed, 93 insertions(+)
 create mode 100644 src/menu/rom_database.c
 create mode 100644 src/menu/rom_database.h

diff --git a/Makefile b/Makefile
index 3c5c5894..df0cb8f5 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,7 @@ SRCS = \
 	menu/menu_info.c \
 	menu/menu_fileinfo.c \
 	menu/settings.c \
+	menu/rom_database.c \
 	utils/fs.c \
 	libs/toml/toml.c \
 	main.c
diff --git a/src/menu/rom_database.c b/src/menu/rom_database.c
new file mode 100644
index 00000000..578d729b
--- /dev/null
+++ b/src/menu/rom_database.c
@@ -0,0 +1,82 @@
+#include "rom_database.h"
+#include <stdint.h>
+
+uint8_t rom_db_match_save_type(uint16_t id, uint32_t crc) {
+
+    if (id == *(uint16_t *)"ED") {
+        return SAVE_TYPE_CART_SPECIFIED;
+    }
+
+    // Match the default entries for crc_high.
+    if (crc == 0xbcb1f89f)return DB_SAVE_TYPE_EEPROM_4K;    // kirby v1.3
+    if (crc == 0x46039fb4)return DB_SAVE_TYPE_EEPROM_16K;   // kirby U
+    if (crc == 0x0d93ba11)return DB_SAVE_TYPE_EEPROM_16K;   // kirby U
+    if (crc == 0xce84793d)return DB_SAVE_TYPE_SRAM;         // donkey kong f2
+    if (crc == 0x4cbc3b56)return DB_SAVE_TYPE_SRAM;         // DMTJ 64DD game
+    if (crc == 0x0dd4abab)return DB_SAVE_TYPE_EEPROM_16K;   // DK Retail kiosk demo (shares ID with Dinosaur planet, but hacks are unlikely)!
+    if (crc == 0xeb85ebc9)return DB_SAVE_TYPE_FLASHRAM;     // DOUBUTSU BANCHOU (ANIMAL LEADER, Cubivore) - Contains no game ID
+    
+
+    // Match the default entries for ROM ID.
+    // It is useful to use this rather than CRC's so that ROM hacks continue to work.
+    static char *cart_ids[] = {
+        // EEP4K
+        "AB", "AD", "AG", "BC", "BD", "BH", "BK", "BM", "BN", "BV", "B6", "CG", "CH", "CR", "CT", "CU",
+        "CX", "DR", "DQ", "DU", "DY", "D3", "D4", "EA", "ER", "FG", "FH", "FW", "FX", "FY", "GC", "GE",
+        "GF", "GU", "GV", "HA", "HF", "HP", "IC", "IJ", "IR", "JM", "K2", "KA", "KI", "KT", "LB", "LR",
+        "MG", "MI", "ML", "MO", "MR", "MS", "MU", "MW", "N6", "NA", "OH", "PG", "PW", "PY", "RC", "RS",
+        "S6", "SA", "SC", "SM", "SU", "SV", "SW", "TB", "TC", "TJ", "TM", "TN", "TP", "TR", "TX", "T6",
+        "VL", "VY", "WC", "WL", "WQ", "WR", "WU", "XO", "4W",        
+        // EEP16K
+        "B7", "CW", "CZ", "DO", "D2", "D6", "EP", "EV", "FU", "F2", "IM", "M8", "MV", "MX", "NB", "NX",
+        "PD", "RZ", "UB", "X7", "YS", "3D",
+        // SRAM
+        "AL", "AY", "A2", "DA", "FZ", "GP", "G6", "K4", "KG", "MF", "OB", "RE", "RI", "TE", "VB", "VP",
+        "WI", "W2", "WX", "WZ", "YW", "ZL",
+        // FLASHRAM
+        "AF", "CC", "CK", "DL", "DP", "JD", "JF", "KJ", "M6", "MQ", "P2", "P3", "PF", "PH", "PN", "PO",
+        "PS", "RH", "SI", "SQ", "T9", "W4", "ZS",
+        // SRAM_BANKED
+        "DZ"
+    };
+    static int save_types[] = {
+        // EEP4K
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+        // EEP16K
+        0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+        0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+        // SRAM
+        0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+        0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+        // FLASHRAM
+        0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
+        0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
+        // SRAM_BANKED
+        0x05,
+        // Last entry.
+        0xff
+    };
+
+    for (int i = 0; save_types[i] != 0xff; i++) {
+
+        if (id == *(uint16_t *) cart_ids[i]) {
+            i = save_types[i];
+            // i = i == 1 ? DB_SAVE_TYPE_EEPROM_4K : 
+            //     i == 2 ? DB_SAVE_TYPE_EEPROM_16K :
+            //     i == 3 ? DB_SAVE_TYPE_SRAM : 
+            //     i == 4 ? DB_SAVE_TYPE_FLASHRAM : 
+            //     i == 5 ? DB_SAVE_TYPE_SRAM_BANKED : 
+            //     DB_SAVE_TYPE_NONE;
+            return i;
+        }
+
+    }
+
+    return DB_SAVE_TYPE_NONE; //Nothing matched.
+}
diff --git a/src/menu/rom_database.h b/src/menu/rom_database.h
new file mode 100644
index 00000000..16b47969
--- /dev/null
+++ b/src/menu/rom_database.h
@@ -0,0 +1,10 @@
+// NOTE: these values are independent on flashcart / OS
+#define DB_SAVE_TYPE_NONE           0x00
+#define DB_SAVE_TYPE_EEPROM_4K      0x01
+#define DB_SAVE_TYPE_EEPROM_16K     0x02
+#define DB_SAVE_TYPE_SRAM           0x03
+#define DB_SAVE_TYPE_FLASHRAM       0x04
+#define DB_SAVE_TYPE_SRAM_BANKED    0x05
+#define DB_SAVE_TYPE_CART_SPECIFIED 0x99
+
+uint8_t rom_db_match_save_type(uint16_t id, uint32_t crc);