Initial work on ROM database

1 files changed, 83 insertions, 0 deletions

diff --git a/romdb.c b/romdb.c
new file mode 100644
index 0000000..0de4af5
--- /dev/null
+++ b/romdb.c
@@ -0,0 +1,83 @@
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+#include "romdb.h"
+#include "util.h"
+
+#define GAME_ID_OFF 0x183
+#define GAME_ID_LEN 8
+#define TITLE_START 0x150
+#define TITLE_END (TITLE_START+48)
+
+tern_node *load_rom_db()
+{
+	char *exe_dir = get_exe_dir();
+	if (!exe_dir) {
+		fputs("Failed to find executable path\n", stderr);
+		exit(1);
+	}
+	char *path = alloc_concat(exe_dir, "/rom.db");
+	tern_node *db = parse_config_file(path);
+	free(path);
+	if (!db) {
+		fputs("Failed to load ROM DB\n", stderr);
+	}
+	return db;
+}
+
+char *get_header_name(uint8_t *rom)
+{
+	uint8_t *last = rom + TITLE_END - 1;
+	uint8_t *src = rom + TITLE_START;
+	
+	while (last > src && (*last <=  0x20 || *last >= 0x80))
+	{
+		last--;
+	}
+	if (last == src) {
+		//TODO: Use other name field
+		return strdup("UNKNOWN");
+	} else {
+		last++;
+		char *ret = malloc(last - (rom + TITLE_START) + 1);
+		uint8_t *dst;
+		for (dst = ret; src < last; src++)
+		{
+			if (*src >= 0x20 && *src < 0x80) {
+				*(dst++) = *src;
+			}
+		}
+		*dst = 0;
+		return ret;
+	}
+}
+
+rom_info configure_rom_heuristics(uint8_t *rom)
+{
+	rom_info info;
+	info.name = get_header_name(rom);
+	
+}
+
+rom_info configure_rom(tern_node *rom_db, void *vrom)
+{
+	uint8_t product_id[GAME_ID_LEN+1];
+	uint8_t *rom = vrom;
+	product_id[GAME_ID_LEN] = 0;
+	for (int i = 0; i < GAME_ID_LEN; i++)
+	{
+		if (rom[GAME_ID_OFF + i] <= ' ') {
+			product_id[i] = 0;
+			break;
+		}
+		product_id[i] = rom[GAME_ID_OFF + i];
+		
+	}
+	tern_node * entry = tern_find_prefix(rom_db, product_id);
+	if (!entry) {
+		return configure_rom_heuristics(rom);
+	}
+	rom_info info;
+	info.name = strdup(tern_find_ptr_default(entry, "name", "UNKNOWN"));
+	return info;
+}
\ No newline at end of file