Java InputStream Read Bytes readBytes(InputStream in, long len)

Description

read Bytes

License

Open Source License

Declaration

public static byte[] readBytes(InputStream in, long len) throws IOException 

Method Source Code

//package com.java2s;
// This package is part of the Spiralcraft project and is licensed under

import java.io.InputStream;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class Main {
    public static final int DEFAULT_BUFFER_SIZE = 65536;

    public static byte[] readBytes(InputStream in) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        copyRaw(in, out, DEFAULT_BUFFER_SIZE);
        return out.toByteArray();
    }/*from  w w  w  . ja v a2 s.com*/

    public static byte[] readBytes(InputStream in, long len) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        copyRaw(in, out, DEFAULT_BUFFER_SIZE, len);
        return out.toByteArray();
    }

    /**
     * Copy an InputStream to an OutputStream using a buffer of the specified size.
     */
    public static long copyRaw(InputStream in, OutputStream out, int bufferSize) throws IOException {
        byte[] buffer = new byte[bufferSize];
        long count = 0;
        for (;;) {
            int read = in.read(buffer, 0, buffer.length);
            if (read < 0) {
                break;
            }
            out.write(buffer, 0, read);
            count += read;
        }
        return count;

    }

    /**
     * Copy (len) bytes from an InputStream to an OutputStream 
     *   using a buffer of the specified size and blocking until the specified
     *   number of bytes is read.
     */
    public static long copyRaw(InputStream in, OutputStream out, int bufferSize, long len) throws IOException {
        if (bufferSize <= 0) {
            bufferSize = DEFAULT_BUFFER_SIZE;
        }
        byte[] buffer = new byte[bufferSize];
        long count = 0;

        if (len <= 0) {
            for (;;) {
                int read = in.read(buffer, 0, buffer.length);
                if (read < 0) {
                    break;
                }
                out.write(buffer, 0, read);
                count += read;
            }
        } else {
            for (;;) {
                int read = in.read(buffer, 0, (int) Math.min(buffer.length, len - count));
                if (read < 0) {
                    break;
                }
                out.write(buffer, 0, read);
                count += read;
                if (count == len) {
                    break;
                }
            }
        }
        return count;
    }
}

Related

1. readBytes(InputStream in, int bytesToRead, byte[] buffer, int bufferOffset)
2. readBytes(InputStream in, int expectedBytes, long timeoutMs)
3. readBytes(InputStream in, int len, boolean isLE)
4. readBytes(InputStream in, int length)
5. readBytes(InputStream in, int maxLeng)
6. readBytes(InputStream input)
7. readBytes(InputStream input, byte[] data, int capacity)
8. readBytes(InputStream input, Class type)
9. readbytes(InputStream input, int n)