Add mint tests into MinIO repo (#7886)

mint/build/aws-sdk-java/src/Utils.java

@@ -0,0 +1,76 @@
+/*
+*  Mint, (C) 2018 Minio, Inc.
+*
+*  Licensed under the Apache License, Version 2.0 (the "License");
+*  you may not use this file except in compliance with the License.
+*  You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+*  Unless required by applicable law or agreed to in writing, software
+*
+*  distributed under the License is distributed on an "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*  See the License for the specific language governing permissions and
+*  limitations under the License.
+*/
+
+
+package io.minio.awssdk.tests;
+
+import java.io.*;
+import java.nio.channels.*;
+import java.security.*;
+
+class Utils {
+
+    public static byte[] createChecksum(InputStream is, int skip, int length) throws Exception {
+        int numRead;
+        byte[] buffer = new byte[1024];
+
+        MessageDigest complete = MessageDigest.getInstance("MD5");
+
+        if (skip > -1 && length > -1) {
+            is = new LimitedInputStream(is, skip, length);
+        }
+
+        do {
+            numRead = is.read(buffer);
+            if (numRead > 0) {
+                complete.update(buffer, 0, numRead);
+            }
+        } while (numRead != -1);
+
+        return complete.digest();
+    }
+
+    public static String getInputStreamMD5(InputStream is) throws Exception {
+        return getInputStreamMD5(is, -1, -1);
+    }
+
+    public static String getInputStreamMD5(InputStream is, int start, int length) throws Exception {
+        byte[] b = createChecksum(is, start, length);
+        String result = "";
+
+        for (int i=0; i < b.length; i++) {
+            result += Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 );
+        }
+        return result;
+    }
+
+    public static String getFileMD5(String filePath) throws Exception {
+        return getFileMD5(filePath, -1, -1);
+    }
+
+    public static String getFileMD5(String filePath, int start, int length) throws Exception {
+        File f = new File(filePath);
+        InputStream is = new FileInputStream(f);
+        return getInputStreamMD5(is, start, length);
+    }
+
+    public static String getBufferMD5(byte[] data) throws Exception {
+        ByteArrayInputStream bis = new ByteArrayInputStream(data);
+        return getInputStreamMD5(bis);
+    }
+}
+