michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.mozglue;
michael@0: 
michael@0: import java.io.InputStream;
michael@0: import java.nio.ByteBuffer;
michael@0: 
michael@0: class ByteBufferInputStream extends InputStream {
michael@0: 
michael@0:     protected ByteBuffer mBuf;
michael@0:     // Reference to a native object holding the data backing the ByteBuffer.
michael@0:     private NativeReference mNativeRef;
michael@0: 
michael@0:     protected ByteBufferInputStream(ByteBuffer buffer, NativeReference ref) {
michael@0:         mBuf = buffer;
michael@0:         mNativeRef = ref;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public int available() {
michael@0:         return mBuf.remaining();
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void close() {
michael@0:         mBuf = null;
michael@0:         mNativeRef.release();
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public int read() {
michael@0:         if (!mBuf.hasRemaining() || mNativeRef.isReleased()) {
michael@0:             return -1;
michael@0:         }
michael@0: 
michael@0:         return mBuf.get() & 0xff; // Avoid sign extension
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public int read(byte[] buffer, int offset, int length) {
michael@0:         if (!mBuf.hasRemaining() || mNativeRef.isReleased()) {
michael@0:             return -1;
michael@0:         }
michael@0: 
michael@0:         length = Math.min(length, mBuf.remaining());
michael@0:         mBuf.get(buffer, offset, length);
michael@0:         return length;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public long skip(long byteCount) {
michael@0:         if (byteCount < 0 || mNativeRef.isReleased()) {
michael@0:             return 0;
michael@0:         }
michael@0: 
michael@0:         byteCount = Math.min(byteCount, mBuf.remaining());
michael@0:         mBuf.position(mBuf.position() + (int)byteCount);
michael@0:         return byteCount;
michael@0:     }
michael@0: 
michael@0: }