1 files changed, 123 insertions, 0 deletions
diff --git a/helpers/dump_mappers.c b/helpers/dump_mappers.c
new file mode 100644
index 0000000..98dad4e
--- /dev/null
+++ b/helpers/dump_mappers.c
@@ -0,0 +1,123 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <dirent.h>
+#include <zlib.h>
+#include <minizip/unzip.h>
+#include <sys/stat.h>
+
+#define INES_HEADER_SIZE 16
+
+static void print_mapper(uint32_t mapper, const char *path) {
+	uint32_t mapper_id = mapper >> 4;
+	uint32_t submapper = mapper & 0xF;
+
+	printf("%03u_%x  %s\n", mapper_id, submapper, path);
+}
+
+static void process_nes_file(const char *path) {
+	FILE *f = fopen(path, "rb");
+	if(!f) return;
+
+	uint8_t header[INES_HEADER_SIZE];
+	if(fread(header, 1, INES_HEADER_SIZE, f) != INES_HEADER_SIZE) {
+		fclose(f);
+		return;
+	}
+	fclose(f);
+
+	if(memcmp(header, "NES\x1A", 4) != 0) return;
+
+	uint8_t mapper_low  = (header[6] >> 4);
+	uint8_t mapper_high = (header[7] & 0xF0);
+	uint8_t mapper_ext  = header[8] & 0x0F;
+	uint8_t submapper   = header[8] >> 4;
+
+	uint32_t mapper = (mapper_ext << 8) | mapper_high | mapper_low;
+	mapper = (mapper << 4) | submapper;
+
+	print_mapper(mapper, path);
+}
+
+static void process_zip_file(const char *path) {
+	unzFile zip = unzOpen(path);
+	if(!zip) return;
+
+	if(unzGoToFirstFile(zip) != UNZ_OK) {
+		unzClose(zip);
+		return;
+	}
+
+	char filename[256];
+	unz_file_info info;
+	if(unzGetCurrentFileInfo(zip, &info, filename, sizeof(filename), 0, 0, 0, 0) != UNZ_OK) {
+		unzClose(zip);
+		return;
+	}
+
+	if(strstr(filename, ".nes") == 0) {
+		unzClose(zip);
+		return;
+	}
+
+	if(unzOpenCurrentFile(zip) != UNZ_OK) {
+		unzClose(zip);
+		return;
+	}
+
+	uint8_t header[INES_HEADER_SIZE];
+	if(unzReadCurrentFile(zip, header, INES_HEADER_SIZE) != INES_HEADER_SIZE) {
+		unzCloseCurrentFile(zip);
+		unzClose(zip);
+		return;
+	}
+	unzCloseCurrentFile(zip);
+	unzClose(zip);
+
+	if(memcmp(header, "NES\x1A", 4) != 0) return;
+
+	uint8_t mapper_low  = (header[6] >> 4);
+	uint8_t mapper_high = (header[7] & 0xF0);
+	uint8_t mapper_ext  = header[8] & 0x0F;
+	uint8_t submapper   = header[8] >> 4;
+
+	uint32_t mapper = (mapper_ext << 8) | mapper_high | mapper_low;
+	mapper = (mapper << 4) | submapper;
+
+	print_mapper(mapper, path);
+}
+
+static void scan_directory(const char *path) {
+	DIR *dir = opendir(path);
+	if(!dir) return;
+
+	struct dirent *entry;
+	while((entry = readdir(dir))) {
+		if(entry->d_name[0] == '.') continue;
+
+		char fullpath[1024];
+		snprintf(fullpath, sizeof(fullpath), "%s/%s", path, entry->d_name);
+
+		struct stat st;
+		if(stat(fullpath, &st) < 0) continue;
+
+		if(S_ISDIR(st.st_mode)) {
+			scan_directory(fullpath);
+		} else if(strstr(fullpath, ".nes")) {
+			process_nes_file(fullpath);
+		} else if(strstr(fullpath, ".zip")) {
+			process_zip_file(fullpath);
+		}
+	}
+	closedir(dir);
+}
+
+int main(int argc, char **argv) {
+	if(argc < 2) {
+		fprintf(stderr, "Usage: %s <romdir>\n", argv[0]);
+		return 1;
+	}
+	scan_directory(argv[1]);
+	return 0;
+}