finyally

duck/object.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define N 75000
+
+int main() {
+    unsigned char *buf = (unsigned char *)malloc(N * sizeof(char));
+    unsigned char check[4] = {0xd9, 0x45, 0x08, 0xd9};
+    size_t n = fread(buf, sizeof(char), N, stdin);
+    for(size_t i = 0; i < n - 3; i++){
+        if(buf[i] == check[0] && buf[i + 1] == check[1] && buf[i + 2] == check[2] && buf[i + 3] == check[3]) {
+            buf[i + 4] = 0xeb;
+            buf[i + 5] = 0x90;
+            buf[i + 6] = 0xd8;
+            buf[i + 7] = 0xc9;
+            break;
+        }
+    }
+    fwrite(buf, sizeof(char), n, stdout);
+    free(buf);
+    return 0;
+}