unGzip Byte Array To String - Android java.util.zip

Android examples for java.util.zip:Zip

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Description

unGzip Byte Array To String

Demo Code

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.util.zip.GZIPInputStream;

public class Main {

  public static String unGzipBytesToString(InputStream in) {

    try {//from   w  ww.java  2s.  c om
      PushbackInputStream pis = new PushbackInputStream(in, 2);
      byte[] signature = new byte[2];
      pis.read(signature);
      pis.unread(signature);
      int head = ((signature[0] & 0x00FF) | ((signature[1] << 8) & 0xFF00));
      if (head != GZIPInputStream.GZIP_MAGIC) {
        return new String(toByteArray(pis), "UTF-8").trim();
      }
      GZIPInputStream gzip = new GZIPInputStream(pis);
      byte[] readBuf = new byte[8 * 1024];
      ByteArrayOutputStream outputByte = new ByteArrayOutputStream();
      int readCount = 0;
      do {
        readCount = gzip.read(readBuf);
        if (readCount > 0) {
          outputByte.write(readBuf, 0, readCount);
        }
      } while (readCount > 0);
      if (outputByte.size() > 0) {
        return new String(outputByte.toByteArray());
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }

  public static byte[] toByteArray(InputStream input) throws Exception {
    if (input == null) {
      return null;
    }
    ByteArrayOutputStream output = null;
    byte[] result = null;
    try {
      output = new ByteArrayOutputStream();
      byte[] buffer = new byte[1024 * 100];
      int n = 0;
      while (-1 != (n = input.read(buffer))) {
        output.write(buffer, 0, n);
      }
      result = output.toByteArray();
    } finally {
      closeQuietly(input);
      closeQuietly(output);
    }
    return result;
  }

  public static void closeQuietly(InputStream is) {
    try {
      if (is != null) {
        is.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void closeQuietly(OutputStream os) {
    try {
      if (os != null) {
        os.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

}

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