Add cdh test

tests/test_get_cdh.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include "libmineziper_zip.h"
+
+#define BUF_SIZE 10000
+
+int main(int argc, char** argv)
+{
+  FILE* stream = fopen(argv[1], "r");
+  if (stream == NULL)
+  {
+    fprintf(stderr, "Cannot open file for writing\n");
+    return -1;
+  }
+
+  char buf[BUF_SIZE + 1];
+  zip zip;
+  raw raw;
+
+  raw.size = fread(buf, BUF_SIZE, 1, stream);
+  buf[BUF_SIZE] = '\0';
+  raw.buf = buf;
+
+  find_cdh(&raw, &zip);
+
+  return 0;
+}