close idle connection after finish a request;

Author: chzyer

src/com/qiniu/auth/Client.java

@@ -22,6 +22,7 @@
 import org.apache.http.util.EntityUtils;
 
 import java.io.IOException;
+import java.util.concurrent.TimeUnit;
 
 public class Client {
 
@@ -119,6 +120,7 @@ protected void onProgressUpdate(Object... values) {
 
 		@Override
 		protected void onPostExecute(Object o) {
+			mClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
 			if (o instanceof Exception) {
 				mRet.onFailure((Exception) o);
 				return;

src/com/qiniu/utils/InputStreamAt.java

@@ -135,6 +135,8 @@ public byte[] read(long offset, int length) throws IOException {
 
 	protected byte[] fileStreamRead(long offset, int length) throws IOException {
 		if (mFileStream == null) return null;
+		long fileLength = mFileStream.length();
+		if (length + offset > fileLength) length = (int) (fileLength - offset);
 		byte[] data = new byte[length];
 
 		int read;