#118 Handle case when zip file is less than 22kb

src/main/java/net/lingala/zip4j/headers/HeaderReader.java

@@ -60,6 +60,12 @@ public class HeaderReader {
   private byte[] intBuff = new byte[4];
 
   public ZipModel readAllHeaders(RandomAccessFile zip4jRaf, Charset charset) throws IOException {
+
+    if (zip4jRaf.length() < ENDHDR) {
+      throw new ZipException("Zip file size less than minimum expected zip file size. " +
+          "Probably not a zip file or a corrupted zip file");
+    }
+
     zipModel = new ZipModel();
 
     try {

src/test/java/net/lingala/zip4j/ExtractZipFileIT.java

@@ -366,6 +366,16 @@ public void testExtractNestedZipFileWithAesOnInnerAndZipStandardOuter() throws I
     testExtractNestedZipFileWithEncrpytion(EncryptionMethod.AES, EncryptionMethod.ZIP_STANDARD);
   }
 
+  @Test
+  public void testExtractZipFileLessThanMinimumExpectedZipFileSizeThrowsException() throws IOException {
+    expectedException.expect(ZipException.class);
+    expectedException.expectMessage("Zip file size less than minimum expected zip file size. " +
+        "Probably not a zip file or a corrupted zip file");
+
+    ZipFile zipFile = new ZipFile(getTestArchiveFromResources("invalid_zip_file_size_less_than_22kb.zip"));
+    zipFile.extractAll(temporaryFolder.toString());
+  }
+
   private void testExtractNestedZipFileWithEncrpytion(EncryptionMethod innerZipEncryption,
                                                        EncryptionMethod outerZipEncryption) throws IOException {
     File innerZipFile = temporaryFolder.newFile("inner.zip");

src/test/resources/test-archives/invalid_zip_file_size_less_than_22kb.zip

@@ -0,0 +1 @@
+version=18.3.0