--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/common.c	Sat May 21 18:41:54 2022 -0400
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdint.h>
+
+void set_data(unsigned char magic[], uint16_t version, FILE* target) {
+	int i;
+	fseek(target, 0x46, SEEK_SET);
+	fputc(version, target);
+	for (i=0; i<=sizeof(*magic); ++i) {
+		fseek(target, 0x18+i, SEEK_SET);
+		fputc(magic[i], target);
+	}
+}
+
+int copy_file(char* source_file, char* target_file) {
+	char ch[4096];
+	FILE *source, *target;
+
+	source = fopen(source_file, "rb");
+
+	if (source == NULL)
+		return 1;
+
+	target = fopen(target_file, "wb");
+
+	if (target == NULL) {
+		fclose(source);
+		return 1;
+	}
+
+	while (fgetc(source) != EOF) {
+		size_t b = fread(ch, 1, sizeof(ch), source);
+		if (b)
+			fwrite(ch, 1, b, target);
+	}
+
+	fclose(target);
+	fclose(source);
+	return 0;
+}