chesshog-qrcode/src/main/java/org/hedgecode/chess/qrcode/zip/ZipContentDeflater.java

   1 /*
   2  * Copyright (c) 2018-2019. Developed by Hedgecode.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *   http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.hedgecode.chess.qrcode.zip;
  18
  19 import java.io.ByteArrayOutputStream;
  20 import java.io.IOException;
  21 import java.util.zip.Deflater;
  22 import java.util.zip.DeflaterOutputStream;
  23
  24 import org.hedgecode.chess.qrcode.ChessQRCodeConstants;
  25 import org.hedgecode.chess.qrcode.ChessQRCodeException;
  26
  27 /**
  28  *
  29  *
  30  * @author Dmitry Samoshin aka gotty
  31  */
  32 public class ZipContentDeflater {
  33
  34     public static String deflate(String contents) throws ChessQRCodeException {
  35         byte[] bytes = contents.getBytes(
  36                 ChessQRCodeConstants.CHARSET
  37         );
  38         if (bytes.length > ZipContentUtils.getMaxContentLength()) {
  39             throw new ChessQRCodeException(
  40                     ChessQRCodeException.Type.PARSE, "zip.max.length.error"
  41             );
  42         }
  43         ByteArrayOutputStream bout = new ByteArrayOutputStream();
  44         DeflaterOutputStream zout = new DeflaterOutputStream(
  45                 bout, new Deflater(Deflater.BEST_COMPRESSION)
  46         );
  47         try {
  48             try {
  49                 zout.write(bytes);
  50             } finally {
  51                 zout.close();
  52                 bout.close();
  53             }
  54         } catch (IOException e) {
  55             throw new ChessQRCodeException(
  56                     ChessQRCodeException.Type.PARSE, "zip.deflate.write.error", e.getMessage()
  57             );
  58         }
  59         return ZipContentUtils.base64Encode(
  60                 ZipContentUtils.concat(
  61                         bytes.length,
  62                         bout.toByteArray()
  63                 )
  64         );
  65     }
  66
  67
  68     public static void main(String[] args) throws ChessQRCodeException {
  69         StringBuilder sb = new StringBuilder();
  70         for (int i = 0; i < 10; ++i) {
  71             sb.append(i).append("bla-bla-bla").append(i);
  72         }
  73         String zipContents = ZipContentDeflater.deflate(sb.toString());
  74         System.out.println("Zip Contents: " + zipContents);
  75         System.out.println("Zip length: " + zipContents.length());
  76         String contents = ZipContentInflater.inflate(zipContents);
  77         System.out.println("Unzip Contents: " + contents);
  78         System.out.println("Unziip length: " + contents.length());
  79         System.out.println("Equals: " + sb.toString().equals(contents));
  80     }
  81
  82 }