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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      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 com.android.messaging.util.exif;
     18 
     19 import java.io.InputStream;
     20 import java.nio.ByteBuffer;
     21 
     22 class ByteBufferInputStream extends InputStream {
     23 
     24     private final ByteBuffer mBuf;
     25 
     26     public ByteBufferInputStream(ByteBuffer buf) {
     27         mBuf = buf;
     28     }
     29 
     30     @Override
     31     public int read() {
     32         if (!mBuf.hasRemaining()) {
     33             return -1;
     34         }
     35         return mBuf.get() & 0xFF;
     36     }
     37 
     38     @Override
     39     public int read(byte[] bytes, int off, int len) {
     40         if (!mBuf.hasRemaining()) {
     41             return -1;
     42         }
     43 
     44         len = Math.min(len, mBuf.remaining());
     45         mBuf.get(bytes, off, len);
     46         return len;
     47     }
     48 }
     49