gecko/mobile/android/base/sqlite/ByteBufferInputStream.java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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 * The Original Code is Mozilla Android code.
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 * The Initial Developer of the Original Code is Mozilla Foundation.
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 * Contributor(s):
 *   Gian-Carlo Pascutto <gpascutto@mozilla.com>
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package org.mozilla.gecko.sqlite;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

/*
 * Helper class to make the ByteBuffers returned by SQLite BLOB
 * easier to use.
 */
public class ByteBufferInputStream extends InputStream {
    private ByteBuffer mByteBuffer;

    public ByteBufferInputStream(ByteBuffer aByteBuffer) {
        mByteBuffer = aByteBuffer;
    }

    @Override
    public synchronized int read() throws IOException {
        if (!mByteBuffer.hasRemaining()) {
            return -1;
        }
        return mByteBuffer.get();
    }

    @Override
    public synchronized int read(byte[] aBytes, int aOffset, int aLen)
        throws IOException {
        int toRead = Math.min(aLen, mByteBuffer.remaining());
        mByteBuffer.get(aBytes, aOffset, toRead);
        return toRead;
    }
}