add GZipUtil.java

Author: YangSen-qn

library/src/main/java/com/qiniu/android/utils/GZipUtil.java

@@ -0,0 +1,77 @@
+package com.qiniu.android.utils;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+public class GZipUtil {
+
+    public static byte[] gZip(String string){
+        if (string == null){
+            return null;
+        }
+        return gZip(string.getBytes());
+    }
+
+    public static byte[] gZip(byte[] bytes){
+        if (bytes == null){
+            return null;
+        }
+        if (bytes.length == 0){
+            return bytes;
+        }
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        GZIPOutputStream gzip = null;
+        try {
+            gzip = new GZIPOutputStream(out);
+            gzip.write(bytes);
+        } catch (IOException e){
+        } finally {
+            if (gzip != null){
+                try {
+                    gzip.close();
+                } catch (IOException e){
+                }
+            }
+        }
+
+        return out.toByteArray();
+    }
+
+    public static byte[] gUnzip(byte[] bytes) {
+        if (bytes == null){
+            return null;
+        }
+        if (bytes.length == 0){
+            return bytes;
+        }
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
+
+        GZIPInputStream gunzip = null;
+        try {
+            gunzip = new GZIPInputStream(in);
+            byte[] buffer = new byte[256];
+            int n;
+            while ((n = gunzip.read(buffer)) >= 0) {
+                out.write(buffer, 0, n);
+            }
+        } catch (IOException e) {
+        } finally {
+            if (gunzip != null) {
+                try {
+                    gunzip.close();
+                } catch (IOException e) {
+                }
+            }
+        }
+
+        return out.toByteArray();
+    }
+}