diff --git a/libmineziper/include/libmineziper_zip.h b/libmineziper/include/libmineziper_zip.h
index ff8ff27..57704c3 100644
--- a/libmineziper/include/libmineziper_zip.h
+++ b/libmineziper/include/libmineziper_zip.h
@@ -1,15 +1,27 @@
 #ifndef LIBMINEZIPER_ZIP_H
 #define LIBMINEZIPER_ZIP_H
 
+#define START_CDH_SEARCH 22
+#define CDH_MB           "PK\05\06"
+#define LFH_MB           "PK\03\04"
+
+typedef struct raw
+{
+  char* buf;
+  int size;
+} raw;
+
 typedef struct CDH
 {
-  void* crc32;  // TODO TYPE?
+  char mb[4];       // CDH_MB "PK\05\06"
+  void* crc32;      // TODO TYPE?
   LFH* lfh;
-  void* filename;  // TODO TYPE?
+  void* filename;   // TODO TYPE?
 } CDH;
 
 typedef struct LFH
 {
+  char mb[4];       // CDH_MB "PK\03\04"
   void* crc32;  // TODO TYPE?
   LFH* lfh;
   int size_compressed_data;
@@ -24,6 +36,7 @@ typedef struct zip
   CDH* central_directory;
 } zip;
 
+void find_cdh(raw* raw, zip* out);
 void parse_zip(char* filename, zip* out);
 
 #endif
\ No newline at end of file
diff --git a/libmineziper/src/libmineziper_zip.c b/libmineziper/src/libmineziper_zip.c
new file mode 100644
index 0000000..d09e593
--- /dev/null
+++ b/libmineziper/src/libmineziper_zip.c
@@ -0,0 +1,20 @@
+#include "libmineziper_zip.h"
+#include <string.h>
+
+void find_cdh(raw* raw, zip* out)
+{
+  if (raw->size < START_CDH_SEARCH)
+    return;
+
+  char* se = raw->buf + raw->size - START_CDH_SEARCH;
+  while (se > raw->buf)
+  {
+    if (strcmp(se, CDH_MB) == 0)
+    {
+      zip->cdh = se;
+      break;
+    }
+
+    se--;
+  }
+}
\ No newline at end of file