Find cdh in zip

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--;
+  }
+}