Java InputStream Read All readAllFrom(java.io.InputStream is)

Description

Reads an input stream til EOF and returns all bytes read.

License

Apache License

Parameter

Parameter	Description
is	The input stream to read.

Return

An array of bytes that represents all bytes read from the stream until the end-of-file is reached.

Declaration

public static byte[] readAllFrom(java.io.InputStream is) throws java.io.IOException 

Method Source Code

//package com.java2s;
/* Copyright (c) 2009 Google Inc.
 *
 * Licensed 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.// w w  w. j a  v a 2 s  . c o  m
 */

public class Main {
    /** Reads an input stream til EOF and returns all bytes read.
     *  The stream will NOT be closed.
     *
     *  @param is The input stream to read.
     *  @return An array of bytes that represents all bytes read
     *  from the stream until the end-of-file is reached.
     */
    public static byte[] readAllFrom(java.io.InputStream is) throws java.io.IOException {
        byte[] buf = new byte[8192];
        int i = 0;
        int n = 0, r;
        final int SIZE = 4096;

        while (true) {
            // invariant: buf[0..n-1] has the valid data
            // and buffer capacity is >= n

            // make sure buffer has capacity at least n + SIZE
            while (buf.length <= n + SIZE + 1)
                buf = resizeVec(buf, 2 * buf.length);

            // read into buf
            r = is.read(buf, n, SIZE);
            if (r <= 0)
                break; // end of stream

            n += r;
        }

        // resize the byte array to its correct size
        return resizeVec(buf, n);
    }

    private static byte[] resizeVec(byte[] b, int newSize) {
        byte[] c = new byte[newSize];
        System.arraycopy(b, 0, c, 0, b.length > newSize ? newSize : b.length);
        return c;
    }
}

Related

1. readAll(InputStream is)
2. readAll(InputStream is, byte[] buffer, int offset, int length)
3. readAll(InputStream stream)
4. readAll(InputStream stream)
5. readAllBuffer(InputStream stream, byte[] buffer)
6. readAllFromStream(InputStream is)
7. readAllInString(InputStream in)