Here you can find the source of readFully(final FileChannel src, final ByteBuffer dst, final long position)
public static void readFully(final FileChannel src, final ByteBuffer dst, final long position) throws IOException
//package com.java2s; /*// w ww .j a v a 2s. c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import java.io.EOFException; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import javax.annotation.Nonnegative; import javax.annotation.Nonnull; public class Main { public static void readFully(final FileChannel src, final ByteBuffer dst, final long position) throws IOException { while (dst.remaining() > 0) { if (-1 == src.read(dst, position + dst.position())) { throw new EOFException(); } } } /** * Read until dst buffer is filled or src channel is reached end. * * @return The number of bytes read, 0 or more */ public static int read(@Nonnull final FileChannel src, @Nonnull final ByteBuffer dst, @Nonnegative final long position) throws IOException { int count = 0; long offset = position; while (dst.remaining() > 0) { int n = src.read(dst, offset); if (n == -1) { break; } offset += n; count += n; } return count; } }